Carrier Heat Pump 38AUQ User Manual

38AUQ  
Heat Pump Condensing Units  
60 Hz  
with Puron® (R-410A) Refrigerant  
Sizes 07, 08, and 12  
Installation, Start-Up and  
Service Instructions  
Comfort Alert Diagnostic Module . . . . . . . . . . . . . . 28  
Lubrication . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30  
CONTENTS  
SAFETY CONSIDERATIONS . . . . . . . . . . . . . . . . . . . . . . . 1  
INSTALLATION GUIDELINES. . . . . . . . . . . . . . . . . . . . . . . 2  
INSTALLATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-14  
Step 1 – Plan for Unit Location . . . . . . . . . . . . . . . . . . . 7  
Step 2 – Complete Pre-Installation Checks. . . . . . . . . . 7  
Step 3 – Prepare Unit Mounting Support . . . . . . . . . . 7  
Step 4 – Rig and Mount the Unit . . . . . . . . . . . . . . . . . . 7  
Step 5 – Complete Refrigerant Piping Connections . . . 7  
Step 6 – Install Accessories. . . . . . . . . . . . . . . . . . . . . . 10  
Step 7 – Complete Electrical Connections . . . . . . . . . 10  
PRE-START-UP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15  
System Check . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15  
Turn On Crankcase Heater . . . . . . . . . . . . . . . . . . . . . . 15  
Preliminary Charge. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15  
START-UP. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15 -18  
38AUQ Units . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15  
OPERATING SEQUENCE. . . . . . . . . . . . . . . . . . . . . . . . . . 19  
Indoor (Supply) Fan. . . . . . . . . . . . . . . . . . . . . . . . . . . . 19  
Cooling Unit Without Economizer. . . . . . . . . . . . . . . . . 19  
Cooling, Unit With Economizer . . . . . . . . . . . . . . . . . . . 19  
Heating. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19  
Supplemental Heating/Emergency Heating . . . . . . . . 19  
Defrost Cycle . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19  
Cooling and Heating Shutdown. . . . . . . . . . . . . . . . . 19  
ROUTINE SYSTEM MAINTENANCE. . . . . . . . . . . . . . . 20  
Quarterly Inspection (and 30 days after initial start). . 20  
SERVICE. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .20 - 31  
Refrigeration System . . . . . . . . . . . . . . . . . . . . . . . . . 20  
Compressor Oil. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20  
Outdoor Coil Maintenance and Cleaning  
Recommendations. . . . . . . . . . . . . . . . . . . . . . . . . . . 30  
Service Parts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31  
Fastener Torque Values . . . . . . . . . . . . . . . . . . . . . . . 31  
TROUBLESHOOTING . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32  
APPENDIX A  
Air Conditioner and Heat Pump with Puron –  
Quick Reference Guide. . . . . . . . . . . . . . . . . . . . . . . 33  
APPENDIX B  
Wiring Diagram List. . . . . . . . . . . . . . . . . . . . . . . . . 33  
APPENDIX C  
Motormaster Sensor Locations. . . . . . . . . . . . . . . . . 34  
START-UP CHECKLIST . . . . . . . . . . . . . . . . . . . .CL-1, CL-2  
®
SAFETY CONSIDERATIONS  
Improper installation, adjustment, alteration, service,  
maintenance, or use can cause explosion, fire, electrical shock  
or other conditions which may cause personal injury or  
property damage. Consult a qualified installer, service agency,  
or your distributor or branch for information or assistance. The  
qualified installer or agency must use factory-authorized kits or  
accessories when modifying this product. Refer to the  
individual instructions package  
Follow all safety codes. Wear safety glasses and work gloves.  
Use quenching cloths for brazing operations and have a fire  
extinguisher available. Read these instructions thoroughly and  
follow all warnings or cautions attached to the unit. Consult  
local building codes and appropriate national electrical codes  
(in USA, ANSI/NFPA70, National Electrical Code (NEC); in  
Canada, CSA C22.1) for special requirements.  
It is important to recognize safety information. This is the  
Servicing Systems on Roofs with  
safety-alert symbol  
. When you see this symbol on the unit  
Synthetic Materials. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20  
and in instructions or manuals, be alert to the potential for  
personal injury.  
Liquid Line Filter Drier . . . . . . . . . . . . . . . . . . . . . . . . . 21  
Filed Refrigerant Access Ports . . . . . . . . . . . . . . . . . 21  
Outdoor Coil Metering Devices. . . . . . . . . . . . . . . . . 21  
Refrigerant System Pressure Access Ports . . . . . . . . 21  
Heat Pump Controls. . . . . . . . . . . . . . . . . . . . . . . . . . 22  
Commercial Defrost Board . . . . . . . . . . . . . . . . . . . . . . 22  
Crankcase Heater. . . . . . . . . . . . . . . . . . . . . . . . . . . . 22  
Compressor Protection. . . . . . . . . . . . . . . . . . . . . . . . . . 22  
Low-Pressure Switches . . . . . . . . . . . . . . . . . . . . . . . . . 33  
Understand the signal words DANGER, WARNING,  
CAUTION, and NOTE. These words are used with the safety-  
alert symbol. DANGER identifies the most serious hazards  
which will result in severe personal injury or death.  
WARNING signifies hazards which could result in personal  
injury or death. CAUTION is used to identify unsafe practices,  
which may result in minor personal injury or product and  
property damage. NOTE is used to highlight suggestions  
which will result in enhanced installation, reliability, or  
operation.  
 
Standard  
Weight  
Corner  
A
Corner  
B
Corner  
C
Corner  
D
Center of Gravity  
Unit Height  
UNIT  
lbs.  
kg.  
lbs.  
kg.  
lbs.  
kg.  
lbs.  
kg.  
lbs.  
kg.  
X
Y
Z
H
23  
26  
13  
42-3/8  
38AUQ*07  
444 201 134  
61  
97  
44  
90  
85  
41  
123  
125  
157  
56  
[584]  
[660]  
[330]  
[1076]  
20  
24  
13  
42-3/8  
[1076]  
38AUQ*08 483 219 162  
38AUQ*12  
74  
84  
110  
126  
50  
57  
39  
48  
57  
71  
[508]  
[610]  
[330]  
21  
24  
23  
50-3/8  
575 261 186  
106  
[533]  
[610]  
[584]  
[1280]  
Fig. 1 — 38AUQ*07-12 Unit Dimensions  
3
 
Table 1A — Physical Data — 38AUQ*07-12 Units — 60 Hz English  
UNIT SIZE 38AUQ  
*07  
*08  
*12  
6
7.5  
10  
NOMINAL CAPACITY (tons)  
OPERATING WEIGHTS (lb)  
Aluminum-Fin Coils  
444  
483  
R-410A  
21.0  
575  
REFRIGERANT TYPE‡  
Operating Charge, Typical (lb)†  
18.0  
10.0  
27.0  
15.0  
Shipping Charge (lb)  
12.0  
COMPRESSOR  
Qty...Type  
1...Scroll  
1...Scroll  
1...Scroll  
OUTDOOR FANS  
Qty...Rpm  
2...1100  
2...1100  
2...1100  
1
1
1
Motor Hp  
/
/
/
4
4
4
Diameter (in)  
22  
22  
22  
Nominal Airflow (Cfm Total)  
Watts (Total)  
6,000  
610  
6,000  
610  
6,000  
610  
1...Round Tube/Plate Fin (RTPF)  
OUTDOOR COIL (Qty)  
Face Area (sq ft total)  
Rows/Fins per inch (FPI)  
17.5  
2/17  
23.0  
2/17  
28.1  
2/17  
CONTROLS  
Pressurestat Settings (psig)  
High Cutout  
Cut-in  
630 ±10  
505 ±20  
27 ±3  
630 ±10  
505 ±20  
27 ±3  
630 ±10  
505 ±20  
27 ±3  
Low Cutout  
Cut-in  
44 ±5  
44 ±5  
44 ±5  
PIPING CONNECTIONS (in. ODS)  
Qty...Vapor  
1...11/8  
1...3/8  
1...11/8  
1...1/2  
1...13/8  
1...1/2  
Qty...Liquid  
LEGEND  
ODS — Outside Diameter Sweat (socket)  
‡ Unit is factory-supplied with partial charge only.  
† Typical operating charge with 25 ft of interconnecting piping.  
4
 
Table 1B — Physical Data — 38AUQ*07-12 Units — 60 Hz SI  
UNIT SIZE 38AUQ  
*07  
*08  
*12  
21.1  
26.4  
35.1  
NOMINAL CAPACITY (kW)  
OPERATING WEIGHT (kg)  
Aluminum-Fin Coils  
201  
219  
R-410A  
9.5  
261  
REFRIGERANT TYPE‡  
Operating Charge, Typical (kg)†  
8.2  
4.5  
12.2  
6.8  
Shipping Charge (kg)  
5.9  
COMPRESSOR  
Qty...Type  
1...Scroll  
1...Scroll  
1...Scroll  
CONDENSER FANS  
Qty...r/s  
2...18  
2...18  
2...18  
1
1
1
Motor Hp NEMA  
Diameter (mm)  
Nominal Airflow (L/s)  
Watts (Total)  
/
/
/
4
4
4
560  
2832  
610  
560  
2832  
610  
560  
2832  
610  
1...Round Tube/Plate Fin (RTPF)  
CONDENSER COIL (Qty)  
Face Area (sq m total)  
1.6  
2.1  
2.6  
Rows/Fins per Meter (Fins/m)  
2/670  
2/670  
2/670  
CONTROLS  
Pressurestat Settings (kPa)  
High Cutout  
Cut-in  
4344 ±70  
4344 ±70  
4344 ±70  
3482 ±138 3482 ±138 3482 ±138  
Low Cutout  
Cut-in  
186 ±21  
303 ±35  
186 ±21  
303 ±35  
186 ±21  
303 ±35  
PIPING CONNECTIONS (in. ODS)  
Qty...Vapor  
1...11/8  
1...3/8  
1...11/8  
1...1/2  
1...13/8  
1...1/2  
Qty...Liquid  
LEGEND  
NEMA — National Electrical Manufacturers Association  
ODS — Outside Diameter Sweat (socket)  
‡ Unit is factory-supplied with partial charge only.  
† Typical operating charge with 7.62 m of interconnecting piping.  
5
 
1
2
3
4
5
6
7
8
9
10 11 12 13 14 15 16 17 18  
3
8 A U Q A 1 2 A 0  
6
– 0 A 0 A 0  
C
_____________  
____  
Model Type  
Packaging  
0 = Standard  
1 = LTL  
38AU= Carrier Condensing Unit  
Puronr R---410A Refrigerant  
Type of Coil  
Q = Heat Pump Scroll Compressor  
Electrical Options  
A = None  
C = Non-Fused Disconnect  
Refrigerant Options  
A = None  
Service Options  
B = Low Ambient  
0 = None  
1 = Un-powered Convenience Outlet  
2 = Powered Convenience Outlet  
Nominal Tonnage  
07 = 6 Tons  
08 = 7.5 Tons  
12 = 10 Tons  
Not Used  
A = Place Holder  
Not Used  
Base Unit Controls  
A = Not Used  
0 = Electro-Mechanical Controls  
Not Used  
0 = Not Used  
Design Revision  
A = Initial Rev (Discrete Model Number)  
Voltage  
Coil Options  
1 = 575/3/60  
A= Al/Cu  
B = Precoat Al/Cu  
C = E-Coat Al/Cu  
5 = 208/230/3/60  
6 = 460/3/60  
E= Cu/Cu  
M= Al/Cu with Hail Guard  
N = Precoat Al/Cu with Hail Guard  
P = E-Coat Al/Cu with Hail Guard  
R = Cu/Cu with Hail Guard  
Fig. 2 — Model Number Nomenclature  
POSITION NUMBER  
TYPICAL  
1
4
2
8
3
0
4
9
5
G
6
1
7
2
8
3
9
4
10  
5
POSITION  
1−2  
DESIGNATES  
Week of manufacture (fiscal calendar)  
3−4  
Year of manufacture (”09” = 2009)  
5
Manufacturing location (G = ETP, Texas, USA)  
Sequential number  
6−10  
Fig. 3 — Serial Number Nomenclature  
6
 
CONSIDER SYSTEM REQUIREMENTS  
.INSTALLATION  
• Consult local building codes and National Electrical  
Code (NEC, U.S.A.) for special installation requirements.  
• Allow sufficient space for airflow clearance, wiring,  
refrigerant piping, and servicing unit. See Fig.1 for unit  
dimensions and weight distribution data.  
• Locate the unit so that the outdoor coil (condenser) air-  
flow is unrestricted on all sides and above.  
• The unit may be mounted on a level pad directly on the  
base channels or mounted on raised pads at support  
points. See Tables 1A and 1B for unit operating weights.  
See Fig. 1 for weight distribution based on recommended  
support points.  
Jobsite Survey  
Complete the following checks before installation.  
1. Consult local building codes and the NEC (National  
Electrical Code) ANSI/NFPA 70 for special installation  
requirements.  
2. Determine unit location (from project plans) or select unit  
location.  
3. Check for possible overhead obstructions which may in-  
terfere with unit lifting or rigging.  
Step 1 — Plan for Unit Location  
NOTE: If vibration isolators are required for a particular  
installation, use the data in Fig. 1 to make the proper  
selection.  
Select a location for the unit and its support system (pad, rails  
or other) that provides for the minimum clearances required for  
safety. This includes the clearance to combustible surfaces, unit  
performance and service access below, around and above unit  
as specified in unit drawings. See Fig. 4.  
Select a unit mounting system that provides adequate height to  
allow for removal and disposal of frost and ice that will form  
during the heating-defrost mode.  
Step 3 — Prepare Unit Mounting Support  
Slab Mount  
Provide a level concrete slab that extends a minimum of 6 in.  
(150 mm) beyond unit cabinet. Install a gravel apron in front of  
condenser coil air inlet to prevent grass and foliage from  
obstructing airflow.  
NOTE: Consider also the effect of adjacent units on airflow  
performance and control box safety clearance.  
Step 4 — Rig and Mount the Unit  
Do not install the outdoor unit in an area where fresh air supply  
to the outdoor coil may be restricted or when recirculation from  
the condenser fan discharge is possible. Do not locate the unit  
in a well or next to high walls.  
Evaluate the path and required line length for interconnecting  
refrigeration piping, including suction riser requirements (out-  
door unit above indoor unit), liquid line lift (outdoor unit below  
indoor unit) and hot gas bypass line. Relocate sections to mini-  
mize the length of interconnecting tubing.  
UNIT DAMAGE HAZARD  
Failure to follow this caution may result in equipment  
damage.  
All panels must be in place when rigging. Unit is not  
designed for handling by fork truck.  
.
DO NOT BURY REFRIGERATION LINES.  
RIGGING — These units are designed for overhead rigging.  
Refer to the rigging label for preferred rigging method. Spread-  
er bars are not required if top crating is left on the unit. All pan-  
els must be in place when rigging. As further protection for coil  
faces, plywood sheets may be placed against the sides of the  
unit, behind cables. Run cables to a central suspension point so  
that the angle from the horizontal is not less than 45 degrees.  
Raise and set the unit down carefully.  
If it is necessary to roll the unit into position, mount the unit on  
longitudinal rails, using a minimum of 3 rollers. Apply force to  
the rails, not the unit. If the unit is to be skidded into position,  
place it on a large pad and drag it by the pad. Do not apply any  
force to the unit.  
Although unit is weatherproof, avoid locations that permit  
water from higher level runoff and overhangs to fall onto the  
unit.  
RIGHT:  
Min 18” (457 mm)  
requried for service  
REAR:  
Min 18” (457 mm)  
requried for service  
LEFT:  
Min 18” (457 mm)  
FRONT:  
requried for service  
42” (1067 mm)  
Raise from above to lift the unit from the rails or pad when unit  
is in its final position.  
After the unit is in position, remove all shipping materials and  
top crating.  
Note: Observe requirements for 39” (914 mm) operating clearance  
on either Left or Rear coil opening.  
Step 5 — Complete Refrigerant Piping  
Connections  
Refrigerant lines must be carefully designed and constructed to  
ensure equipment reliability and efficiency. Line length, pres-  
sure drop, compressor oil return, and vertical separation are  
several of the design criteria that must be evaluated. See  
Table 2.  
Fig. 4 — Service Clearance Dimensional Drawing  
Step 2 — Complete Pre-Installation Checks  
CHECK UNIT ELECTRICAL CHARACTERISTIC —  
Confirm before installation of unit that voltage, amperage and  
circuit protection requirements listed on unit data plate agree  
with power supply provided.  
UNCRATE UNIT — Remove unit packaging except for the  
top skid assembly, which should be left in place until after the  
unit is rigged into its final location.  
IMPORTANT: Do not bury refrigerant piping underground.  
INSPECT SHIPMENT — File a claim with shipping com-  
pany if the shipment is damaged or incomplete.  
IMPORTANT: A refrigerant receiver is not provided with  
the unit. Do not install a receiver.  
7
 
Table 2 — 38AUQ*07-12 Piping Recommendations (Single-Circuit Unit)  
Equivalent Length  
R-410A  
Model  
Ft  
0-38  
38-75  
75-113  
113-150  
Length Linear 0-25  
Nominal Capacity Length Equiiv 0-38  
25-50  
38-75  
50-75  
75-113  
75-100  
113-115  
3
3
3
1
3
1
38AUQ*07  
38AUQ*08  
38AUQ*12  
Liquid Line  
/
/
/
/
/
/
2
8
8
8
2
8
Max Lift  
Cool  
Heat  
25  
25  
7
/
50  
50  
7
/
48  
46  
1-1/8  
75  
60  
39  
31  
1-1/8  
100  
60  
Suction Line  
Charge (lbs)  
Liquid Line  
8
8
17.8  
1
18.8  
1
20.3  
1
22.6  
21.4  
1
24.5  
/
/
/
/
2
2
2
2
Max Lift  
Cool  
Heat  
25  
25  
7
/
50  
50  
1-1/8  
75  
60  
1-1/8  
100  
60  
1-1/8  
Suction Line  
Charge (lbs)  
Liquid Line  
1-1/8  
8
20.9  
1
23.0  
1
24.9  
1
26.8  
1
5
/
/
/
/
/
8
2
2
2
2
Max Lift  
Cool  
Heat  
25  
25  
50  
50  
75  
60  
85  
60  
100  
60  
7
Suction Line  
Charge (lbs)  
/
1-1/8  
1-1/8  
1-1/8  
1-1/8  
1-3/8  
8
26.8  
28.8  
30.7  
33.4  
37.2  
Legend:  
Length Equiv  
Liquid Line  
Equivalent tubing length, including effects of refrigeration specialties devices  
Tubing size, inches OD.  
Max Lift  
Cooling  
Heating  
Maximum liquid lift at maximum permitted liquid line pressure drop  
• Indoor unit ABOVE outdoor unit  
• Indoor unit BELOW outdoor unit  
Suction Line  
Charge  
Tube size, inches OD  
Charge Quantity, lbs. Calculated for both liquid line sizes (where applicable), but only with larger  
suction line size (where applicable)  
NOTE:  
For applications with linear length greater than 100 ft (30.5 m), contact your local Carrier representative.  
CHECK VERTICAL SEPARATION — If there is any vertical  
separation between the indoor and outdoor units, check to  
ensure that the separation is within allowable limits. Relocate  
equipment if necessary.  
PROVIDE SAFETY RELIEF — If local codes dictate an  
additional safety relief device, purchase locally and install  
locally. Installation will require the recovery of the factory  
shipping charge before the factory tubing can be cut and the  
supplemental relief device is installed.  
REFRIGERANT LINE SIZING — Consider the length of  
the piping required between the outdoor and indoor units. The  
maximum allowable line length is 100 ft (30.5 m). See Table 2.  
Refrigerant vapor piping should be insulated.  
INSTALL FILTER  
DRIER(S) AND  
MOISTURE  
INDICATOR(S) — Every unit MUST have a bi-directional  
filter drier in the liquid line. Locate the filter drier at the indoor  
unit, close to the evaporator coil’s thermal expansion valve  
(TXV) inlets.  
38AUQ units include one Puron-duty filter drier, shipped in  
cartons attached to the unit basepan. Remove the filter drier  
and prepare to install in the liquid line at the evaporator coil.  
Do not remove connection fitting plugs until ready to connect  
and braze the filter drier into the liquid line position.  
Table 4 — Puron-duty Filter Drier(s)  
Liquid  
Desiccant  
Volume  
Part  
Number Ref  
Model-Size  
Qty  
Line OD  
38AUQ*07  
38AUQ*08  
38AUQ*12  
1
1
1
3/8-in  
1/2-in  
1/2-in  
8 cu. in.  
16 cu. in.  
16 cu. in.  
KH43LG091  
KH43LG085  
KH43LG085  
IMPORTANT: A refrigerant receiver is not provided  
with the unit. Do not install a receiver.  
Table 3 — Maximum Vertical Separation*  
Installation of liquid line moisture indicating sightglass in each  
circuit is recommended. Locate the sightglass(es) between the  
outlet of the filter drier and the TXV inlet.  
Refer to Table 5 for recommendations on refrigeration  
specialties.  
Select the filter drier for maximum unit capacity and minimum  
pressure drop. Complete the refrigerant piping from the indoor  
unit to the outdoor unit before opening the liquid and suction  
lines at the outdoor unit.  
DISTANCE FT (M)  
UNIT 38AUQ  
UNIT 40RUQ  
Unit 38AUQ  
Above Unit 40RMQ  
07  
08  
12  
07  
08  
12  
50 (15.2)  
60 (18.3)  
60 (18.3)  
*Vertical distance between indoor and outdoor units.  
8
 
Table 5 — Refrigerant Specialties Part Numbers.  
LIQUID LINE  
SIZE (in.)  
LIQUID LINE  
SOLENOID VALVE (LLSV)  
LLSV  
COIL  
SIGHT  
GLASS  
FILTER  
DRIER  
3
/
/
/
ALC-066208  
ALC-066209†  
ALC-066212  
AMG-24/50-60  
AMG-24/50-60  
AMG-24/50-60  
HMI-1TT3  
HMI-1TT4  
HMI-1TT5  
8
2
8
Provided with unit  
See Table 4  
1
5
38AUD units require TWO sets of parts.  
INSTALL LIQUID LINE SOLENOID VALVE —  
It is recommended that a bi-directional solenoid valve be  
placed in the main liquid line (see Figs. 5 & 6) between the  
outdoor unit and the indoor coil. Locate the solenoid valve at  
the end of the liquid line, near the outdoor unit connections,  
with flow direction arrow pointed at the outdoor unit. Refer to  
Table 5. (A liquid line solenoid valve is required when the  
liquid line length exceeds 75 ft [23 m].) This valve prevents  
refrigerant migration (which causes oil dilution) to the  
compressor during the off cycle, at low outdoor ambient  
temperatures. Wire the solenoid according to the unit label  
diagram.  
EQUALIZER LINE  
TXV  
INDOOR  
SENSING  
BULB  
COIL CKT 2  
SIGHT GLASS  
LOCATION  
FILTER DRIER  
LOCATION  
TXV  
AIRFLOW  
15 DIAMS  
CKT 2  
10  
MIN  
DIAMS  
8 DIAMS  
MIN  
TXV  
SENSING  
BULB  
LIQUID  
LINE  
INDOOR  
COIL CKT 1  
SOLENOID  
VALVE  
TXV  
AIRFLOW  
15 DIAMS  
MIN  
CKT 1  
10  
DIAMS  
8 DIAMS  
MIN  
UNIT DAMAGE HAZARD  
Failure to follow this caution may result in equipment  
damage.  
Failure to use a solenoid valve relay (SUR) accessory may  
cause overload of Comfort Alert Diagnostic Module  
(CADM) and compressor alarm lock out.  
LEGEND  
TXV — Thermostatic Expansion Valve  
Fig.6 — Location of Sight Glass(es) and Filter Driers  
(typical 38AUQ/40RUQ size 12 system)  
CAPACITY CONTROL LIQUID LINE SOLENOID VALVE  
Evaporator capacity control via liquid solenoid valve is not rec-  
ommended for use with 38AUQ models.  
Table 6 — Minimum Outdoor Air Operating Temperature  
MINIMUM OUTDOOR  
%
TEMP — F (C)*  
EQUALIZER LINE  
TXV  
UNIT  
COMPRESSOR  
CAPACITY  
Head Pressure  
Control†  
Standard Unit  
INDOOR  
SENSING  
BULB  
SIGHT GLASS  
A LOCATION  
COIL CKT  
38AUQ07  
38AUQ08  
38AUQ12  
35 (1.7)  
35 (1.7)  
35 (1.7)  
–20 (–28.9)  
–20 (–28.9)  
–20 (–28.9)  
FILTER DRIER  
A
LOCATION  
100  
TXV  
AIRFLOW  
15 DIAMS  
MIN  
10  
DIAMS  
8 DIAMS  
MIN  
*Applies to Cooling mode of operation only.  
LIQUID  
LINE  
†Wind baffles (field-supplied and field-installed) are recommended  
for all units with low ambient head pressure control. Refer to Low  
Ambient Control Installation Instructions (shipped with accessory)  
for details.  
SOLENOID  
VALVE  
LEGEND  
TXV — Thermostatic Expansion Valve  
Table 7 — Insulation for Vapor Line Exposed  
to Outdoor Conditions  
Fig.5 — Location of Sight Glass(es) and Filter Driers  
(typical 38AUQ/40RUQ size 07 & 08 systems)  
LENGTH OF EXPOSED  
INSULATION THICKNESS†  
VAPOR LINE*  
ft  
m
3
in.  
mm  
10  
3
10  
25  
35  
50  
/
/
/
/
8
2
4
4
1
3
3
8
13  
11  
15  
19  
19  
*Recommended vapor line insulation for piping exposed to outdoor  
conditions to prevent loss of heating during heating cycle. When  
vapor line goes through interior spaces, insulation should be  
selected to prevent condensation on cooling cycle. Heating capac-  
ity should be reduced 1000 Btuh (295 W) if over 35 ft (11 m) of  
vapor line with 3/4 in. (19 mm) insulation is exposed to outdoor con-  
ditions.  
†Closed cell foam insulation with a thermal conductivity of: 0.28 Btu  
• in./ft2 • h • °F (0.04 W/m • °C).  
9
 
MAKE PIPING CONNECTIONS — Piping connections at  
the 38AUQ unit are ball valves with stub tube extensions. Do  
not open the unit service valves until all interconnecting tube  
brazing as been completed.  
The stub tube connections include ¼-in SAE service fittings  
with Schrader valve cores (see Fig. 7). Before making any  
brazed connections to the unit service valves, remove both  
Schrader valve caps and cores and save for re-installation. Con-  
nect a source for nitrogen to one of these service fittings during  
tube brazing to prevent the formation of copper oxides inside  
the tubes at brazed joints.  
Example:  
38AUQ*08  
60-ft (18.3 m) linear line length  
Equivalent line length 90-ft (27.4 m)  
Liquid Lift: 20-ft (6.1 m)  
Select line sizes from Table 2 (38AUQ):  
1
Liquid / in  
2
1
Suction 1- / in.  
Charge 23.0 lbs (at 75-ft linear length)  
8
80% of Operating Charge:  
0.80 x 23.0 = 17.6 lbs  
Field Service  
Factory Shipping Charge: 12 lbs  
Access Port  
Factory  
High-Flow  
(Schrader core)  
Field-charge quantity: 17.6 lbs –12.0 lbs = 5.6 lbs  
Access Port  
For linear line lengths longer than 100 ft (30.5 m), contact your  
local Carrier representative for system charge value.  
Service Valve  
with Stem Cap  
Sweat  
Connection  
Step 6 — Install Accessories  
Accessories requiring modifications to unit wiring should be  
completed now. These accessories may include Winter Start  
controls, Low Ambient controls, phase monitor, Compressor  
LOCout. Refer to the instructions shipped with the accessory.  
Fig. 7 — Typical Piping Connection Assembly  
When connecting the field tubing to the 38AUQ service valves,  
wrap the valves in wet rags to prevent overheating  
Pressure-test all joints from outdoor unit connections over to  
the indoor coil, using nitrogen as pressure and with soap-and-  
bubbles.  
Step 7 — Complete Electrical Connections  
When pressure-testing is completed, remove the nitrogen  
source at the outdoor unit service valves and re-install the two  
Schrader valve cores. Torque the cores to 2-3 in-lbs (23-34  
N-cm).  
Where vapor line is exposed to outdoor air, line must be  
insulated. See Table 7 for insulation requirements.  
EVACUATION/DEHYDRATION — Evacuate and dehydrate  
the connected refrigeration system(s) (excluding the 38AUQ  
unit) to 500 microns using a two-stage vacuum pump attached  
to the service ports outside the 38AUQ service valves, follow-  
ing description in GTAC II, Module 4, System Dehydration.  
ELECTRICAL SHOCK HAZARD  
Failure to follow this warning could result in personal  
injury or death.  
Do not use gas piping as an electrical ground. Unit cabinet  
must have an uninterrupted, unbroken electrical ground to  
minimize the possibility of personal injury if an electrical  
fault should occur. This ground may consist of electrical  
wire connected to unit ground lug in control compartment,  
or conduit approved for electrical ground when installed in  
accordance with NEC (National Electrical Code); ANSI/  
NFPA 70, latest edition (in Canada, Canadian Electrical  
Code CSA [Canadian Standards Association] C22.1), and  
local electrical codes.  
NOTE: Check all factory and field electrical connections  
for tightness. Field-supplied wiring shall conform with the  
limitations of 63°F (33°C) rise.  
UNIT OPERATION AND SAFETY HAZARD  
Failure to follow this warning could cause personal injury,  
death and/or equipment damage.  
Puron® (R-410A) refrigerant systems operate at higher  
pressures than standard R-22 systems. Do not use R-22  
service equipment or components on Puron refrigerant  
equipment.  
Field Power Supply —  
If equipped with optional Powered Convenience Outlet: The  
power source leads to the convenience outlet's transformer pri-  
mary are not factory connected. Installer must connect these  
leads according to required operation of the convenience outlet.  
If an always-energized convenience outlet operation is desired,  
connect the source leads to the line side of the unit-mounted  
disconnect. (Check with local codes to ensure this method is  
acceptable in your area.) If a de-energize via unit disconnect  
switch operation of the convenience outlet is desired, connect  
the source leads to the load side of the unit disconnect. On a  
unit without a unit-mounted disconnect, connect the source  
leads to compressor contactor C and indoor fan contactor IFC  
pressure lugs with unit field power leads.  
All units except 208/230-v units are factory wired for the volt-  
age shown on the nameplate. If the 208/230-v unit is to be con-  
nected to a 208-v power supply, the control transformer must  
be rewired by moving the black wire with the 1/4-in. female  
spade connector from the 230-v connection and moving it to  
the 208-v 1/4-in. male terminal on the primary side of the trans-  
former. Refer to unit label diagram for additional information.  
IMPORTANT: Charge in Cooling mode only!  
PRELIMINARY CHARGE — Before starting the unit, charge  
R-410A liquid refrigerant into the high side of each 38AUQ  
circuit through the liquid service valve(s). The amount of  
refrigerant added must be at least 80% of the operating charge  
listed in Table 2 for LINEAR line length LESS the factory  
charge quantity (if factory shipping charge has not been  
removed). See the following example.  
Allow high and low side pressures to equalize. If pressures do  
not equalize readily, charge R-410A vapor (using special  
service manifold with expansion device) into the suction line  
service port for the low side of system to assure charge in the  
evaporator. Refer to GTAC II, Module 5, Charging, Recover,  
Recycling, and Reclamation for liquid charging procedures.  
10  
 
Field power wires are connected to the unit at line-side pres-  
sure lugs on compressor contactor C and TB1 (see wiring dia-  
gram label for control box component arrangement) or at facto-  
ry-installed option non-fused disconnect switch. Max wire size  
is #4 AWG (copper only).  
Units Without Disconnect Option  
C
TB1  
11  
13  
NOTE: TEST LEADS - Unit may be equipped with short  
leads (pigtails) on the field line connection points on con-  
tactor C or optional disconnect switch. These leads are for  
factory run-test purposes only; remove and discard before  
connecting field power wires to unit connection points.  
Make field power connections directly to line connection  
pressure lugs only.  
Disconnect  
per  
NEC  
L1  
L2  
L3  
208/230-3-60  
460-3-60  
575-3-60  
Units With Disconnect Option  
FIRE HAZARD  
Failure to follow this warning could result in intermittent  
operation or performance satisfaction.  
Do not connect aluminum wire between disconnect switch  
and condensing unit. Use only copper wire.  
L1  
2
1
Optional  
Disconnect  
Switch  
Factory  
Wiring  
L2  
L3  
4
6
3
5
(See Fig. 8.)  
Disconnect factory test leads; discard.  
Fig. 9 — Power Wiring Connections  
ELECTRIC  
DISCONNECT  
SWITCH  
All field wiring must comply with the NEC and local  
requirements.  
COPPER  
WIRE ONLY  
Voltage and Current Balance -  
Voltage to compressor terminals during operation must be  
within voltage range indicated on unit nameplate. See Table 10.  
On 3-phase units, voltages between phases must be balanced  
within 2% and the current within 10%. Use the formula shown  
in the legend for Table 8, Note 5 (see page 14) to determine the  
percent of voltage imbalance. Operation on improper line  
voltage or excessive phase imbalance constitutes abuse and  
may cause damage to electrical components. Such operation  
would invalidate any applicable Carrier warranty.  
ALUMINUM  
WIRE  
Fig. 8 — Disconnect Switch and Unit  
Units Without Factory-Installed Disconnect —  
When installing units, provide a disconnect switch per NEC  
(National Electrical Code) of adequate size. Disconnect sizing  
data is provided on the unit informative plate. Locate on unit  
cabinet or within sight of the unit per national or local codes.  
Do not cover unit informative plate if mounting the disconnect  
on the unit cabinet.  
Convenience Outlets  
Units with Factory-Installed Disconnect —  
ELECTRICAL OPERATION HAZARD  
Failure to follow this warning could result in personal  
injury or death.  
Units with convenience outlet circuits may use multiple  
disconnects. Check convenience outlet for power status  
before opening unit for service. Locate its disconnect  
switch, if appropriate, and open it. Tag-out this switch, if  
necessary.  
The factory-installed option disconnect switch is located in a  
weatherproof enclosure located under the main control box.  
The manual switch handle is accessible through an opening in  
the access panel.  
All units -  
All field wiring must comply with NEC and all local codes.  
Size wire based on MCA (Minimum Circuit Amps) on the unit  
informative plate. See Fig. 9 for power wiring connections to  
the unit power terminal block and equipment ground.  
Maximum wire size is #4 ga AWG per pole.  
Provide a ground-fault and short-circuit over-current protection  
device (fuse or breaker) per NEC Article 440 (or local codes).  
Refer to unit informative data plate for MOCP (Maximum  
Over-current Protection) device size.  
Two types of convenience outlets are offered on 38AUQ  
models: Non-powered and unit-powered. Both types provide a  
125-volt GFCI (ground-fault circuit-interrupter) duplex  
receptacle rated at 15-A behind a hinged waterproof access  
cover, located on the end panel of the unit. See Fig. 10.  
11  
 
Convenience  
Outlet  
GFCI  
Pwd-CO  
Fuse  
Switch  
Pwd-CO  
Transformer  
UNIT  
VOLTAGE  
CONNECT  
AS  
PRIMARY  
CONNECTIONS  
L1: RED + YEL  
L2: BLU + GRA  
TRANSFORMER  
TERMINALS  
H1 + H3  
208,  
230  
240  
H2 + H4  
L1: RED  
Splice BLU +  
YEL  
H1  
H2 + H3  
H4  
460  
575  
480  
Control Box  
Access Panel  
L2: GRA  
L1: RED  
L2: GRA  
H1  
H2  
600  
UNIT  
VOLTAGE  
CONNECT  
AS  
PRIMARY  
CONNECTIONS  
TRANSFORMER  
TERMINALS  
Fig. 10 — Convenience Outlet Location  
Non-powered type: This type requires the field installation of  
a general-purpose 125-volt 15-A circuit powered from a source  
elsewhere in the building. Observe national and local codes  
when selecting wire size, fuse or breaker requirements and  
disconnect switch size and location. Route 125-v power supply  
conductors into the bottom of the utility box containing the  
duplex receptacle.  
208,  
230  
L1: RED + YEL  
L2: BLU + GRA  
H1 + H3  
H2 + H4  
240  
L1: RED  
Splice BLU +  
YEL  
H1  
H2 + H3  
H4  
460  
575  
480  
L2: GRA  
L1: RED  
L2: GRA  
H1  
H2  
600  
Unit-powered type: A unit-mounted transformer is factory-  
installed to stepdown the main power supply voltage to the unit  
to 115-v at the duplex receptacle. This option also includes a  
manual switch with fuse, located in a utility box and mounted  
on a bracket behind the convenience outlet; access is through  
the unit's control box access panel. See Fig. 10.  
The primary leads to the convenience outlet transformer are not  
factory-connected. Selection of primary power source is a  
customer-option. If local codes permit, the transformer primary  
leads can be connected at the line-side terminals on the unit-  
mounted non-fused disconnect or HACR breaker switch; this  
will provide service power to the unit when the unit disconnect  
switch or HACR switch is open. Other connection methods  
will result in the convenience outlet circuit being de-energized  
when the unit disconnect or HACR switch is open. See Fig. 11.  
Fig. 11 - Powered Convenience Outlet Wiring  
Duty Cycle: the unit-powered convenience outlet has a duty  
cycle limitation. The transformer is intended to provide power  
on an intermittent basis for service tools, lamps, etc; it is not  
intended to provide 15-amps loading for continuous duty loads  
(such as electric heaters for overnight use). Observe a 50%  
limit on circuit loading above 8-amps (i.e., limit loads  
exceeding 8-amps to 30 minutes of operation every hour).  
Test the GFCI receptacle by pressing the TEST button on the  
face of the receptacle to trip and open the receptacle. Check for  
proper grounding wires and power line phasing if the GFCI re-  
ceptacle does not trip as required. Press the RESET button to  
clear the tripped condition.  
Fuse on power type: The factory fuse is a Bussman “Fusetron”  
T-15, non-renewable screw-in (Edison base) type plug fuse.  
Using unit-mounted convenience outlets: Units with unit-  
mounded convenience outlet circuits will often require that two  
disconnects be opened to de-energize all power to the unit.  
Treat all units as electrically energized until the convenience  
outlet power is also checked and de-energization is confirmed.  
Observe National Electrical Code Article 210, Branch Circuits,  
for use of convenience outlets.  
Installing Weatherproof Cover  
A weatherproof while-in-use cover for the factory-installed  
convenience outlets is now required by UL standards. This  
cover cannot be factory-mounted due its depth; it must be  
installed at unit installation. For shipment, the convenience  
outlet is covered with a blank cover plate.  
The weatherproof cover kit is shipped in the unit's control box.  
The kit includes the hinged cover, a backing plate and gasket.  
DISCONNECT ALL POWER TO UNIT AND  
CONVENIENCE OUTLET.  
Remove the blank cover plate at the convenience outlet;  
discard the blank cover.  
Loosen the two screws at the GFCI duplex outlet, until  
1
approximately / -in (13 mm) under screw heads are exposed.  
2
12  
 
Press the gasket over the screw heads. Slip the backing plate  
over the screw heads at the keyhole slots and align with the  
gasket; tighten the two screws until snug (do not over-tighten).  
Mount the weatherproof cover to the backing plate as shown in  
Fig. 12. Remove two slot fillers in the bottom of the cover to  
permit service tool cords to exit the cover. Check for full  
closing and latching.  
Thermostat —  
Install a Carrier-approved accessory thermostat according to  
installation instructions included with the accessory. For  
complete economizer function, select a two—stage cooling  
thermostat. Locate the thermostat accessory on a solid wall in  
the conditioned space to sense average temperature in  
accordance with the thermostat installation instructions.  
If the thermostat contains a logic circuit requiring 24-v power,  
use a thermostat cable or equivalent single leads of different  
colors with minimum of five leads. If the thermostat does not  
require a 24-v source (no “C” connection required), use a  
thermostat cable or equivalent with minimum of four leads.  
Check the thermostat installation instructions for additional  
features which might require additional conductors in the  
cable.  
COVER – WHILE-IN-USE  
RECEPTACLE  
WEATHERPROOF  
NOT INCLUDED  
For wire runs up to 50 ft. (15 m), use no. 18 AWG (American  
Wire Gage) insulated wire (35°C minimum). For 50 to 75 ft.  
(15 to 23 m), use no. 16 AWG insulated wire (35°C minimum).  
For over 75 ft. (23 m), use no. 14 AWG insulated wire (35°C  
minimum). All wire sizes larger than no. 18 AWG cannot be  
directly connected to the thermostat and will require a junction  
box and splice at the thermostat.  
PremierLink (accessory installation) – Refer to Form 33CS-  
58SI for details on connecting the PremierLink controller and  
its various sensors.  
BASE PLATE FOR  
GFCI RECEPTACLE  
Fig. 12 — Weatherproof Cover Installation  
All Units —  
R
G
Voltage to compressor terminals during operation must be  
within voltage range indicated on unit nameplate. See Table 8.  
On 3-phase units, voltages between phases must be balanced  
within 2% and the current within 10%. Use the formula shown  
in the legend for Table 8, Note 5 (see pages 14) to determine  
the percent of voltage imbalance. Operation on improper line  
voltage or excessive phase imbalance constitutes abuse and  
may cause damage to electrical components. Such operation  
would invalidate any applicable Carrier warranty.  
Y1  
O/B/Y2  
(Notes 1, 2)  
W1  
Field Control Wiring —  
38AUQ unit control voltage is 24 v. See Fig. 19 for typical  
field control connections and the unit’s label diagram for field-  
supplied wiring details. Route control wires to the 38AUQ unit  
through the opening in unit’s end panel to the connections  
terminal board in the unit’s control box.  
W2  
(Note 4)  
C
(Note 3)  
Remainder of the system controls connection will vary  
according to the specific construction details of the indoor  
section. Fig. 13 depicts typical connections to a Carrier 40RUQ  
fan coil unit. Plan for field connections carefully and install  
control wiring correctly per the project plan. Additional  
components and supplemental transformer accessory may be  
required.  
The 38AUQ unit requires an external temperature control  
device. This device can be a thermostat (field-supplied) or a  
PremierLink controller (available as a field-installed accessory,  
for use on a Carrier Comfort Network or as a stand alone  
control).  
Note 1: Typical multi-function marking. Follow manufacturer’s configuration  
instructions to select Y2.  
Note 2: Y2 to economizer required on single-stage cooling units when  
integrated economizer function is desired  
Note 3: Connect only if thermostat requires 24-vac power source.  
Note 4: Connect W2 if supplemental heater installed  
Field Wiring  
Fig. 13 — Typical Remote Thermostat Connections  
13  
 
Table 8 — Electrical Data — 38AUQ*07-12 60 Hz Units  
NOMINAL  
VOLTAGE  
VOLTAGE  
POWER  
SUPPLY  
UNIT  
SIZE  
38AUQ  
FACTORY-  
INSTALLED  
OPTION  
COMPRESSOR  
FAN MOTORS  
RANGE  
V-Ph-Hz  
MIN  
MAX  
RLA  
LRA  
FLA (ea)  
QTY  
MCA  
MOCP  
NONE OR DISCONNECT  
CONVENIENCE OUTLET  
NONE OR DISCONNECT  
CONVENIENCE OUTLET  
NONE OR DISCONNECT  
CONVENIENCE OUTLET  
NONE OR DISCONNECT  
CONVENIENCE OUTLET  
NONE OR DISCONNECT  
CONVENIENCE OUTLET  
NONE OR DISCONNECT  
CONVENIENCE OUTLET  
NONE OR DISCONNECT  
CONVENIENCE OUTLET  
NONE OR DISCONNECT  
CONVENIENCE OUTLET  
NONE OR DISCONNECT  
CONVENIENCE OUTLET  
26.8  
31.6  
13.9  
16.1  
10.5  
12.2  
34.3  
39.1  
17.1  
19.3  
12.5  
14.2  
40.6  
45.4  
22.5  
24.7  
16.5  
18.2  
45  
208/230-3-60  
187  
414  
518  
187  
414  
518  
187  
414  
518  
253  
506  
633  
253  
506  
633  
253  
506  
633  
19.0  
123  
1.5  
2
2
2
2
2
2
2
2
2
50  
20  
25  
15  
15  
50  
60  
25  
30  
20  
20  
60  
60  
30  
30  
25  
30  
460-3-60  
575-3-60  
9.7  
7.4  
62  
50  
0.9  
0.6  
1.5  
0.9  
0.6  
1.5  
0.8  
0.6  
*07  
208/230-3-60  
460-3-60  
25.0  
12.2  
9.0  
164  
100  
78  
*08  
575-3-60  
208/230-3-60  
460-3-60  
30.1  
16.7  
12.2  
225  
114  
80  
*12  
575-3-60  
LEGEND  
5. Unbalanced 3-Phase Supply Voltage  
Never operate a motor where a phase imbalance in supply voltage is  
greater than 2%. Use the following formula to determine the percentage  
of voltage imbalance.  
FLA  
LRA  
MCA  
Full Load Amps  
Locked Rotor Amps  
Minimum Circuit Amps  
max voltage deviation from average voltage  
% Voltage Imbalance = 100 x  
MOCP —  
Maximum Overcurrent  
Protection  
average voltage  
Example: Supply voltage is 208/230-3-60  
NEC  
RLA  
National Electrical Code  
Rated Load Amps  
AB = 224 v  
BC = 231 v  
AC = 226 v  
Units are suitable for use on electrical systems where voltage supplied to  
the unit terminals is not below or above the listed limits.  
NOTES:  
(224 + 231 + 226)  
3
681  
3
1. The MCA and MOCP values are calculated in accordance with the NEC,  
Article 440.  
Average Voltage =  
=
=
2. Motor RLA and LRA values are established in accordance with Underwriters’  
Laboratories (UL), Standard 1995.  
227  
3. The 575-v units are UL, Canada-listed only.  
4. Convenience outlet is available as a factory-installed option and is 115-v,  
1 ph, 60 Hz.  
Determine maximum deviation from average voltage.  
(AB) 227 – 224 = 3 v  
(BC) 231 – 227 = 4 v  
(AC) 227 – 226 = 1 v  
Maximum deviation is 4 v.  
Determine percent of voltage imbalance.  
4
% Voltage Imbalance  
= 100 x  
= 1.76%  
227  
This amount of phase imbalance is satisfactory as it is below the  
maximum allowable 2%.  
IMPORTANT: If the supply voltage phase imbalance is more than  
2%, contact your local electric utility company immediately.  
14  
 
PRE-START-UP  
START-UP  
IMPORTANT: Before beginning Pre-Start-Up or Start-Up,  
review Start-Up Checklist at the back of this book. The  
Checklist assures proper start-up of a unit and provides a  
record of unit condition, application requirements, system  
information, and operation at initial start-up.  
38AUQ Units  
The compressor crankcase heater must be on for 24 hours  
before start-up. After the heater has been on for 24 hours, the  
unit can be started. If no time elapsed since the preliminary  
charge step was completed, it is unnecessary to wait the 24-  
hour period.  
Preliminary Checks  
1. Check that electric power supply agrees with unit  
nameplate data.  
2. Verify that the compressor crankcase heater is securely in  
place.  
3. Check that the compressor crankcase heater has been on  
at least 24 hours.  
UNIT DAMAGE HAZARD  
Do not attempt to start the heat pump system, even  
momentarily, until the following steps have been  
completed. Compressor damage may result.  
4. Recheck for leaks using the procedure outlined in the  
Pre-Start-Up section, Leak Test and Dehydration. If any  
leaks are detected, repair as required. Evacuate and  
dehydrate as described in the Leak Test and Dehydration  
section.  
5. Ensure that the preliminary charge has been added as  
described in the Pre-Start-Up section, Preliminary  
Charge.  
System Check  
1. Check all indoor section and other equipment auxiliary  
components. Consult the manufacturer’s instructions  
regarding any other equipment connected to the con-  
densing unit. If the unit has field-installed accessories,  
be sure all are properly installed and correctly wired. If  
used, the airflow switch must be properly installed.  
2. Be sure the unit is properly leak checked and dehydrated.  
3. Check tightness of all electrical connections.  
4. Open the liquid line and suction line service valves.  
5. Be sure the unit is properly charged. See “Preliminary  
Charge”, below.  
6. The electrical power source must agree with the unit’s  
nameplate rating.  
6. All internal wiring connections must be tight, and all  
barriers and covers must be in place.  
NOTE: The units are factory charged with the required  
amount of oil. If recharging in required, use Emkarate  
RL 32-3MAF.  
Compressor Rotation  
On 3-phase units with scroll compressors, it is important to be  
certain that the compressor is rotating in the proper direction.  
38AUQ units are equipped with a Comfort Alert Diagnostic  
Module (CADM). Alert Code 7 indicates reverse power phas-  
ing.  
7. The crankcase heater must be firmly attached to the com-  
pressor crankcase. Be sure the crankcase is warm (heater  
must be on for 24 hours before starting compressor).  
Turn On Crankcase Heater  
To correct phase order:  
1. Turn off power to the unit, tag disconnect.  
2. Reverse any two of the unit power leads.  
3. Reapply power to the compressor, verify correct pres-  
sures.  
Turn on the crankcase heater for 24 hours before starting the  
unit to be sure all the refrigerant is out of the oil. To energize  
the crankcase heater, proceed as follows:  
1. Set the space thermostat set point above the space tem-  
perature so there is no demand for cooling.  
2. Close the field disconnect.  
To verify the compressor is rotating in the proper direction:  
1. Connect service gages to the suction and liquid pressure  
fittings.  
2. Energize the compressor.  
3. The suction pressure should drop and the liquid pressure  
should rise, as is normal on any start-up.  
Preliminary Charge  
Before starting the unit, charge liquid refrigerant into the high  
side of the system through the liquid service valve. The amount  
of refrigerant added must be at least 80% of the operating  
charge listed in the Physical Data table (Tables 1A and 1B on  
pages 4 and 5). Allow high and low side pressures to equalize  
before starting compressor. If pressures do not equalize readily,  
charge vapor on low side of system to assure charge in the  
evaporator. Refer to GTAC II, Module 5, Charging, Recover,  
Recycling, and Reclamation for liquid charging procedures.  
Compressor Overload  
This overload interrupts power to the compressor when either  
the current or internal motor winding temperature becomes ex-  
cessive, and automatically resets when the internal temperature  
drops to a safe level. This overload may require up to 60 min-  
utes (or longer) to reset. If the internal overload is suspected of  
being open, disconnect the electrical power to the unit and  
check the circuit through the overload with an ohmmeter or  
continuity tester.  
UNIT DAMAGE HAZARD  
Prior to starting compressor, a preliminary charge of  
refrigerant must be added to avoid possible compressor  
damage.  
15  
 
Reset the space thermostat below ambient so that a call for  
cooling is ensured.  
Advanced Scroll Temperature Protection (ASTP)  
A label located above the terminal box identifies Copeland  
Scroll compressor models that contain this technology. See Fig.  
14. Advanced Scroll Temperature Protection (ASTP) is a form  
of internal discharge temperature protection, that unloads the  
scroll compressor when the internal temperature reaches ap-  
proximately 300°F. At this temperature, an internal bi-metal  
disk valve opens and causes the scroll elements to separate,  
which stops compression. Suction and discharge pressures bal-  
ance while the motor continues to run. The longer the compres-  
sor runs unloaded, the longer it must cool before the bi-metal  
disk resets. See Fig. 15.  
Never charge liquid into the low-pressure side of system.  
Do not overcharge. During charging or removal of refriger-  
ant, be sure indoor-fan system is operating. Ensure both  
outdoor fan motors are running; bypass any Motormaster  
function.  
Adjust Refrigerant Charge  
The unit must be charged in Cooling mode only. Refer to Cool-  
ing Charging Charts, Fig. 16 through Fig. 18. For applications  
with line lengths greater than 100 ft, contact Carrier representa-  
tive. Vary refrigerant until the conditions of the chart are met.  
The charts are based on charging the units to the correct sub-  
cooling for the various operating conditions. Accurate pressure  
gage and temperature sensing device are required. Connect the  
pressure gage to the service port on the liquid line service  
valve. Mount the temperature sensing device on the liquid line  
close to the liquid line service valve, and insulate it so that out-  
door ambient temperature does not affect the reading. Indoor  
airflow must be within the unit’s normal operating range. Oper-  
ate the unit for a minimum of 15 minutes. Ensure that pressure  
and temperature readings have stabilized. Plot the liquid pres-  
sure and temperature on chart and add or reduce the charge to  
meet the curve. Adjust the charge to conform with the charging  
chart, using the liquid pressure and temperature to read the  
chart.  
Fig. 14 — Advanced Scroll Temperature  
Protection Label  
Final Checks  
Ensure that all safety controls are operating, control panel  
covers are on, and the service panels are in place.  
120  
110  
100  
90  
80  
70  
60  
50  
40  
30  
20  
10  
0
0
10  
20  
30  
40  
50  
60  
70  
80  
90  
Compressor Unloaded Run Time (Minutes)  
*Times are approximate.  
NOTE: Various factors, including high humidity, high ambient  
temperature, and the presence of a sound blanket will  
increase cool-down times.  
*Times are approximate.  
NOTE: Various factors, including high humidity, high ambient  
temperature, and the presence of a sound blanket will  
increase cool-down times.  
Fig. 15 — Recommended Minimum Cool-Down Time  
After Compressor is Stopped  
To manually reset ASTP, the compressor should be stopped  
and allowed to cool. If the compressor is not stopped, the motor  
will run until the motor protector trips, which occurs up to  
90 minutes later. Advanced Scroll Temperature Protection will  
reset automatically before the motor protector resets, which  
may take up to 2 hours.  
Start Unit  
Set the space thermostat to a set point above space temperature  
so that there is no demand for cooling. Close the 38 AUQ dis-  
connect switch. Only the crankcase heater will be energized.  
16  
 
Fig. 16 — 38AUQ*07 Charging Chart  
Fig. 17 — 38AUQ*08 Charging Chart  
Fig. 18 — 38AUQ*12 Charging Chart  
17  
 
Fig. 19 — 38AUQ Wiring Diagram (208/230-3-60 shown)  
18  
 
Solenoid Valve Relay SVR and compressor contactor C.SVR  
contacts close, energizing the external liquid line solenoid  
valve. Solenoid valve LLSV opens. Compressor contactor C  
closes, energizing the compressor motor. Compressor starts  
and system runs in Heating mode, providing Stage 1 Heat.  
When the space heating load is satisfied terminal W1 is  
de-energized. Compressor and outdoor fan operations stop.  
Liquid line solenoid LLSV is de-energized and valve closes.  
CADM begins its three-minute anti-recycle time delay.  
If either the Loss of Charge (LOC) Switch or High Pressure  
Switch (HPS) opens while, the compressor contactor C and re-  
lay SVR are de-energized; compressor stops and liquid line so-  
lenoid is de-energized (valve closes). CADM initiates a TRIP  
event (compressor demand sensed at CADM terminal Y but no  
current is measured at T1, T2, T3 motor sensors); CADM relay  
opens and RED LED is illuminated. TRIP condition maintains  
lockout of compressor operation until CADM is manually re-  
set. Reset CADM by cycling unit main power.  
OPERATING SEQUENCE  
Base Unit Controls —  
Indoor (Supply) Fan  
The indoor fan contactor (IFC) is remotely located at the fan  
coil or fan section. If the thermostat fan operation is selected as  
Continuous, the IFC is energized and the indoor (supply) fan  
motor runs continuously. If the thermostat fan operation is  
selected as Automatic, the IFC will be energized on a call for  
Cooling or Heating; indoor (supply) fan motor runs. When  
thermostat is satisfied, the IFC is de-energized and indoor  
(supply) fan motor stops.  
Cooling, Unit Without Economizer  
When thermostat calls for Cooling, terminal Y1 is energized.  
The 38AUQ’s Defrost Board (DFB) receives this input at P2-5.  
DFB issues 24-v outputs at OF, P3-7 (RVS1) and P3-10  
(COMP1). The OF output energizes outdoor fan relay (OFR);  
both outdoor fan motors start and run. The output RVS1 ener-  
gizes the reversing valve solenoid (RVS); Reversing valve  
switches to Cooling position.  
Reversing valve solenoid remains de-energized until the next  
Cooling cycle is initiated.  
Defrost Cycle  
Output PL3-10 (COMP1, 24-v) is received at CADM terminal  
Y. If anti-recycle time delay period has not expired, safety pres-  
sure switches are open, and/or lockout alarms are active,  
CADM relay will remain open, preventing compressor start.  
When safety pressure switches are closed and CADM time de-  
lay expires, the CADM relay closes, energizing Solenoid Valve  
Relay SVR and compressor contactor C. SVR contacts close,  
energizing the external liquid line solenoid valve. Solenoid  
valve LLSV opens. Compressor contactor C closes, energizing  
the compressor motor. Compressor starts and system runs in  
Cooling mode.  
When space cooling load is satisfied, terminal Y1 is de-enger-  
ized. Compressor and outdoor fan motors stop. Liquid line so-  
lenoid valve LLSV is de-energized and valve closes. CADM  
begins its three-minute anti-recycle time delay.  
If either the Loss of Charge (LOC) Switch or High Pressure  
Switch (HPS) opens while Y1 remains energized, the compres-  
sor contactor C and relay SVR are de-energized; compressor  
stops and liquid line solenoid is de-energized (valve closes).  
CADM initiates a TRIP event (cooling demand sensed at  
CADM terminal Y but no current is measured at T1, T2, T3  
motor sensors); CADM relay opens and RED LED is illumi-  
nated. TRIP condition maintains lockout of compressor opera-  
tion until CADM is manually reset. Reset CADM by cycling  
unit main power.  
During the Heating Mode, frost and ice can develop on the out-  
door coil. Defrost sequence will clear the frost and ice from the  
coil by briefly reversing the Heating sequence periodically.  
A window to test for a need to run the Defrost cycle opens at a  
fixed period after the end of the last Defrost cycle or the previ-  
ous test window closed. The window period is determined by  
the configuration settings on the DFB’s DIP switches (see unit  
wiring diagram).  
If the outdoor coil’s Defrost Thermostat switch (DFT) is closed  
(shorting DFB terminals DFT1 and DFT1), the Defrost cycle  
will start. Output at OF is removed; outdoor fans stop during  
the Defrost cycle. Output P3–7 (RVS1) is energized; reversing  
valve solenoid RVS is energized and reversing valve changes  
position, placing the circuit in a Cooling mode flow, directing  
hot gas into the outdoor coil where its heat melts the frost and  
loosens the ice on the coil face.  
During the Defrost cycle, output EHEAT is also energized (if  
not already energized by a thermostat W2 demand); supple-  
mental heater will be energized. During the Defrost Cycle,  
LED1 on the DFB will be illuminated. The Defrost cycle ends  
when DFT opens (as liquid temperature exiting the coil rises  
above DFT setpoint) or the defrost cycle runs for 10 minutes.  
Output at EHEAT is removed; supplemental heater will be  
de-energized (unless thermostat has a W2 demand). Output at  
OF is restored; outdoor fans start again. Output P3–7 (RVS1) is  
removed; reversing valve returns to Heating position.  
Reversing valve solenoid (RVS) is energized in Cooling  
modes. This solenoid will remain energized until the next Heat-  
ing mode is initiated.  
Defrost cycle is fixed at a maximum 10 minute duration limit.  
The period to test and initiate a Defrost cycle can be configured  
for 30, 60, 90 or 120 minutes.  
Cooling, Unit With Economizer  
Refer to fan coil unit installation instructions and economizer  
accessory installation instructions for operating sequences  
when system is equipped with accessory economizer.  
Supplemental Heat/Emergency Heat  
Supplemental heat type is determined by 40RUQ indoor unit  
options and accessories. This heat is initiated when the indoor  
unit W2 terminal is energized by the thermostat. (Or as detailed  
in “Defrost Cycle” on page 19.) The thermostat may energizes  
W2 as supplemental (2nd stage) heat at larger space heating de-  
mand, or when selected as emergency heat mode. When the  
space heating demand decreases below the 2nd stage limit, or  
emergency heat is turned off, W2 is de-energized, and supple-  
mental heat is turned off.  
Heating  
When the thermostat calls for first stage heating, terminal W1  
is energized. The 38AUQ’s Defrost Board (DFB) receives this  
input at P2-7. The DFB removes the output at P3-7 (RVS1); the  
reversing valve solenoid is de-energized and the reversing  
valve moves to Heating position.  
DFB issues outputs at OF and P3-10 (COMP1). Outdoor fan  
relay OFR is energized; both outdoor fan motors run.  
Cooling and Heating Shutdown  
Output PL3-10 (COMP1, 24-v) is received at CADM terminal  
Y. If anti-recycle time delay period has not expired and/or  
safety pressure switches are open, outdoor lockout alarms are  
active, CADM relay will remain open, preventing compressor  
start. When safety pressure switches are closed and CADM  
time delay expires, the CADM relay closes, energizing  
Partial or complete cooling or heating functions may shutdown  
caused by loss of main power, open pressure switches, diag-  
nostic alarms, or open internal compressor protections. See  
Service section for further details.  
19  
 
ROUTINE SYSTEM MAINTENANCE  
SERVICE  
These items should be part of a routine maintenance program,  
to be checked every month or two, until a specific schedule for  
each can be identified for this installation:  
Refrigeration System  
Quarterly Inspection  
(and 30 days after initial start)  
EQUIPMENT DAMAGE HAZARD  
Failure to follow this caution may result in damage to  
equipment.  
This system uses Puron® refrigerant which has higher  
pressures than R-22 and other refrigerants. No other refrig-  
erant may be used in this system. Gage set, hoses, and re-  
covery system must be designed to handle Puron®. If you  
are unsure consult the equipment manufacturer.  
Indoor section  
• Coil cleanliness checked.  
• Return air filter replacement  
• Belt tension checked  
• Belt condition checked  
• Pulley alignment checked  
• Fan shaft bearing locking collar tightness checked  
• Condensate drain checked  
• Blower motor amperage  
Compressor Oil  
Outdoor Section  
EQUIPMENT DAMAGE HAZARD  
Failure to follow this caution may result in damage to  
equipment.  
The compressor in a Puron system uses a polyolester  
(POE) oil. This oil is extremely hygroscopic, meaning it  
absorbs water readily. POE oils can absorb 15 times as  
much water as other oils designed for HCFC and CFC re-  
frigerants. Take all necessary precautions to avoid exposure  
of the oil to the atmosphere.  
• Fan motor mounting bolts tightness  
• Compressor mounting bolts  
• Fan blade positioning  
• Control box cleanliness and wiring condition  
• Wire terminal tightness  
• Refrigerant charge level  
Economizer or Outside Air Damper  
• Inlet filters condition  
Servicing Systems on Roofs With Synthetic  
Materials — POE (polyolester) compressor lubricants are  
known to cause long term damage to some synthetic roofing  
materials. Exposure, even if immediately cleaned up, may  
cause embrittlement (leading to cracking) to occur in one year  
or more. When performing any service which may risk expo-  
sure of compressor oil to the roof, take appropriate precautions  
to protect roofing. Procedures which risk oil leakage include  
but are not limited to compressor replacement, repairing refrig-  
erants leaks, replacing refrigerant components such as filter  
drier, pressure switch, metering device, coil, accumulator, or  
reversing valve.  
• Check damper travel (economizer)  
• Check gear and dampers for debris and dirt  
SYNTHETIC ROOF PRECAUTIONARY PROCEDURE  
1. Cover extended roof working area with an impermeable  
polyethylene (plastic) drop cloth or tarp. Cover an ap-  
proximate 10 x 10 ft (3.3 x 3.3 m) area.  
2. Cover area in front of the unit service panel with a terry  
cloth shop towel to absorb lubricant spills and prevent  
run-offs, and protect drop cloth from tears caused by tools  
or components.  
3. Place terry cloth shop towel inside unit immediately un-  
der component(s) to be serviced and prevent lubricant  
run-offs through the louvered openings in the base pan.  
4. Perform required service.  
5. Remove and dispose of any oil contaminated material per  
local codes.  
20  
 
To check the indoor coil, disconnect the supply fan signal  
(A04-A06 direct-drive fans) or contactor (IFC) coil, then start  
the circuit in a Cooling Mode (jumper R to Y1 or Y2) and ob-  
serve the frosting pattern on the face of the indoor coil. A frost  
pattern should develop uniformly across the face of the indoor  
coil starting at each tube at the Acutrol nipple locations.  
To check the outdoor coil, disconnect the outdoor fan motor.  
Start the circuit in a Heating Mode (jumper R to W1 or W2)  
and observe the frost pattern on the face of the outdoor coil.  
Liquid Line Filter Drier  
The factory-provided reversible filter drier is specifically de-  
signed to operate with Puron®. Replace the filter drier with  
factory-authorized components only with a filter drier with  
desiccant made from 100% molecular sieve grade XH-11. Fil-  
ter drier must be replaced whenever the refrigerant system is  
opened.  
When removing a filter drier, use a tubing cutter to cut the drier  
from the system. Do not unsweat a filter drier from the sys-  
tem. Heat from unsweating will release moisture and contami-  
nants from drier into system.  
Failure to develop frost at an outlet tube can indicate a plugged  
or a missing orifice.  
Refrigerant System Pressure Access Ports  
Field Refrigerant Access Ports  
There are two access ports in each circuit - on the suction tube  
near the compressor and on the discharge tube near the com-  
pressor. These are brass fittings with black plastic caps. The  
hose connection fittings are standard 1/4 SAE Male Flare cou-  
plings.  
The brass fittings are two-piece High Flow valves, with a re-  
ceptacle base brazed to the tubing and an integral spring-closed  
check valve core screwed into the base. (See Fig. 20.) This  
check valve is permanently assembled into this core body and  
cannot be serviced separately; replace the entire core body if  
necessary. Service tools are available from RCD that allow the  
replacement of the check valve core without having to recover  
the entire system refrigerant charge. Apply compressor refrig-  
erant oil to the check valve core's bottom o-ring. Install the fit-  
ting body with 96 +/-10 in-lbs of torque; do not overtighten.  
Field service access to refrigerant pressures is through the  
access ports located at the service valves (see Figs 24, 26 and  
28). These ports are ¼-in SAE Flare couplings with Schrader  
check valves and service caps. Use these ports to admit  
nitrogen to the field tubing during brazing, to evacuate the  
tubing and evaporator coil, to admit initial refrigerant charge  
into the low-side of the system and when checking and  
adjusting the system refrigerant charge. When service activities  
are completed, ensure the service caps are in place and secure;  
check for leaks. If the Schrader check valve must be removed  
and re-installed, tighten to 2-3 in-lbs (23-34 N-cm).  
Outdoor Coil Metering Devices  
The metering devices are multiple fixed–bore devices (Acu-  
trol™) swaged into the horizontal outlet tubes from the liquid  
header, located at the entrance to each evaporator coil circuit  
path. These are non–adjustable. Service requires replacing the  
entire liquid header assembly.  
SEAT  
CORE  
(Part No. EC39EZ067)  
1/2-20 UNF RH  
0.596  
45°  
30°  
WASHER  
O-RING  
DEPRESSOR PERARI720  
1/2" HEX  
+.01/-.035  
.47  
5/8” HEX  
FROM FACE OF BODY  
This surface provides a metal to metal seal when  
torqued into the seat. Appropriate handling is  
required to not scratch or dent the surface.  
7/16-20 UNF RH  
Fig. 20 — CoreMax Access Port Assembly  
21  
 
Control Circuit, 24-V  
Heat Pump Controls  
The control circuit is protected against overcurrent conditions  
by a circuit breaker mounted on control transformer TRAN.  
Reset is manual.  
Compressor Protection  
Compressor Overcurrent  
The compressor has internal limbered motor protection.  
Compressor Overtemperature  
Crankcase Heater  
The heater prevents refrigerant migration and compressor oil  
dilution during shutdown whenever compressor is not operat-  
ing. The heater is wired to cycle with the compressor; the heat-  
er is off when compressor is running, and on when compressor  
is off.  
The crankcase heater will operate as long as the power circuit  
is energized.  
The compressor has an internal protector to protect it against  
excessively high discharge gas temperatures.  
High Pressure Switch  
The system is provided with a high pressure switch mount-  
ed on the discharge line. The switch is stem-mounted and  
brazed into the discharge tube. Trip setting is 630 ± 10 psig  
(4344 ± 69 kPa) when hot. Reset is automatic at 505 ± 20  
psig (3482 ± 140 kPa).  
IMPORTANT: Never open any switch or disconnect that  
energizes the crankcase heater unless unit is being serviced  
or is to be shut down for a prolonged period. After a pro-  
longed shutdown on a service job, energize the crankcase  
heater for 24 hours before starting the compressor.  
Loss of Charge Switch  
The system is protected against a loss of charge and low  
evaporator coil loading condition by a loss of charge switch  
located on the liquid line and a freeze protection thermostat on  
the indoor coil. The switch is stem-mounted. Loss of Charge  
Switch trip setting is 27 psig ± 3 psig (186 ±21 kPa). Reset is  
automatic at 44 ±5 psig (303 ± 35 kPa).  
Outdoor Fan Motor Protection  
The outdoor fan motor is internally protected against overtem-  
perature.  
Commercial Defrost Control  
The Commercial Defrost Control Board (DFB) coordinates  
thermostat demands for supply fan control, 1 or 2 stage  
cooling, 1 or 2 stage heating, emergency heating and defrost  
control with unit operating sequences. See Fig. 22 for board  
arrangement.  
The DFB is located in the 38AUQ's main control box (see  
Fig. 21). All connections are factory-wired. Refer to Table 12  
for details of DFB Inputs and Outputs.  
Table 12 —38AUQ Defrost Board I/O and Jumper Configurations  
Inputs  
Point Name  
Type of I/O  
DI, 24-vac  
DI, 24-vac  
DI, 24-vac  
24-vac  
Connection Pin Number  
Unit Connection  
Note  
G Fan  
P2-3  
P2-5  
Not used  
Y1 Cool 1  
TB-Y1  
TB-W1  
TRAN2  
TRAN2  
DFB  
Wi Heat 1  
P2-7  
R Power  
P3-1  
C Common  
DFT1 Defrost Switch  
24-vac, ground  
DI, 24-vac  
P3-3  
DFT-1 to DFT-1  
Outputs  
Point Name  
OF OD Fan  
RVS1  
Type of I/O  
DO, 24-vac  
DO, 24-vac  
DO, 24-vac  
DO, 24-vac  
DO, 24-vac  
Connection Pin Number  
OF  
Unit Connection  
OFR  
Note  
P3-7 to P3-5  
P3-6 to P3-4  
P3-10  
RVS1  
Energize in COOL  
Energize in COOL  
RVS2  
RVS2  
COMP 1  
HEAT 2  
CADM1-Y  
HC-1 (TB4-1)  
E-HEAT  
Configuration  
Point Name  
Type of I/O  
24-vac  
Connection Pin Number  
Unit Connection  
Unit Connection  
Note  
Note  
Select Jumper  
1 Compressor  
P1-1  
P1-2  
24-vac  
Speed-Up Configuration  
Point Name  
Type of I/O  
Connection Pin Number  
Speed-Up Jumper  
Speed-Up Jumper  
JMP17  
JMP18  
Jumper for 1-3 secs: Factory Test, defrost runs for 12 seconds or less  
Jumper for 5-20 secs: Forced Defrost, defrost runs for 30 secs if DFT2 is open  
22  
 
Fig. 21 — Defrost Control Board (DFB) Location  
Defrost  
The defrost control mode is a time/temperature sequence.  
There are two time components: The continuous run period  
and the test/defrost cycle period. The temperature component  
is provided by the defrost thermostat (DFT1) mounted on the  
outdoor coil.  
The continuous run period is a fixed time period between the  
end of the last defrost cycle (or start of the current Heating cy-  
cle) during which no defrost will be permitted. This period can  
be set at 30, 60, 90 or 120 minutes by changing the positions of  
DIP switches SW1 and SW2 (see Fig. 23 and Table 13). The  
default run period is 60 minutes.  
DIP  
Switches  
Speed-Up  
Jumpers  
Fig. 22 — Defrost Control Board (DFB) Arrangement  
Fig. 23 — DIP Switch Settings — Defrost Board  
Reversing valve control  
At the end of the continuous run period, the defrost control will  
test for a need to defrost. On unit sizes 04-07 (single compres-  
sor designs), DFT1 controls the start and termination of the de-  
frost cycle. If DFT1 is still open, the defrost test/run window is  
closed and the control repeats the continuous run period. If  
DFT1 is closed, the defrost cycle is initiated. The defrost period  
will end when DFT1 opens (indicating the outdoor coil has  
been cleared of frost and ice) or a 10 minute elapsed period ex-  
pires, whichever comes first.  
The DFB has two outputs for unit reversing valve control. Op-  
eration of the reversing valves is based on internal logic; this  
application does not use an “O” or “B” signal to determine re-  
versing valve position. Reversing valves are energized during  
the Cooling stages and de-energized during Heating cycles.  
Once energized at the start of a Cooling stage, the reversing  
valve will remain energized until the next Heating cycle de-  
mand is received. Once de-energized at the start of a Heating  
cycle, the reversing valves will remain de-energized until the  
next Cooling stage is initiated.  
At the end of the unit defrost cycle, the unit will be returned to  
Heating cycle for a full continuous run period.  
If the space heating load is satisfied and compressor operation  
is terminated, the defrost control will remember where the run  
period was interrupted. On restart in Heating, the defrost con-  
trol will resume unit operation at the point in the run period  
where it was last operating.  
Compressor control  
The DFB receives inputs indicating Stage 1 Cooling and Stage  
1 Heating from the space thermostat or unit control system  
(PremierLink); it generates commands to start compressors  
with or without reversing valve operation to produce Stage 1  
Cooling (one compressor), or Stage 1 Heating (both compres-  
sors run).  
Table 13 —Dip Switch Position  
Switch No.  
1
2
1
2
1
2
1
2
3
1
0
1
0
1
0
1
0
1
0
On  
Off  
30 minutes  
60 minutes  
90 minutes  
120 minutes  
Fan Delay  
23  
 
Defrost Thermostats  
Defrost Speedup Functions  
These are temperature switches that monitor the surface tem-  
perature of the outdoor coil circuits. These switches are mount-  
ed on the liquid tube exiting the outdoor coil heating circuits.  
These switches close on temperature drop at 30°F (-1°C) and  
reset open on temperature rise at 80°F (27°C).  
The DFB permits the servicer to speed-up the defrost cycle.  
There are two speed-up sequences: relative speed-up and an  
immediate forced defrost. Speed-up sequences are initiated by  
shorting jumper wires JMP17 and JMP18 together (see  
Fig. 22); use a straight-edge screwdriver.  
Shorting the jumpers for a period of 1 to 3 secs reduces the de-  
frost timer periods by a factor of 0.1 sec/minute. (For example,  
the 90 min run period is reduced to 9 secs.) The DFB will step  
the unit through a Heating cycle and a Defrost cycle using  
these reduced time periods. This mode ends after the Defrost  
cycle.  
Shorting the jumpers for a period of 5 to 20 secs bypasses the  
remaining continuous run period and places the unit in a  
Forced Defrost mode. If the controlling DFT is closed when  
this mode is initiated, the unit will complete a normal defrost  
period that will terminate when the controlling DFT opens or  
the 10 minute defrost cycle limit is reached. If the controlling  
DFT is open when this mode is initiated, the Defrost cycle will  
run for 30 secs. Both modes end at the end of the Defrost cycle.  
Indoor Fan Off Delay  
The DFB can provide a 30 sec delay on Indoor Fan Off if the  
thermostat's fan selector switch is set on AUTO control. DIP  
Switch SW3 on the DFB selects use of the fan off time delay  
feature. Setting SW3 in the OPEN position turns the Fan Off  
Delay feature on; setting SW3 in the CLOSED position dis-  
ables this feature. The delay period begins when Y1 demand or  
W1 demand by the space thermostat is removed.  
24  
 
Fans  
Service  
Valves  
Fig. 24 — 38AUQ*07 Exterior  
Outdoor Coil  
Defrost  
Thermostat  
(DFT)  
LOC  
HPS  
High Flow  
Access Ports  
Fig. 25 — 38AUQ*07 Interior  
25  
 
Fans  
Service  
Valves  
Fig. 26 — 38AUQ*08 Exterior  
Outdoor Coil  
Defrost  
Thermostat  
(DFT)  
LOC  
HPS  
High Flow  
Access Ports  
Fig.27 — 38AUQ*08 Interior  
26  
 
Fans  
Service  
Valves  
Fig. 28 — 38AUQ*12 Exterior  
Outdoor Coil  
Defrost  
Thermostat  
(DFT)  
LOC  
HPS  
High Flow  
Access Ports  
Fig. 29 — 38AUQ*12 Interior  
27  
 
COMFORT ALERT DIAGNOSTIC  
MODULE  
POWER  
(GRN)  
The Comfort Alert Diagnostic Module (CADM) monitors and  
®
analyzes data from the Copeland Scroll three-phase compres-  
sor and the thermostat demand. The CADM also provides a  
3-minute anti-recycle time delay to compressor cycling.  
The CADM detects causes for electrical and system related  
failures. Flashing LEDs communicate the Alert codes to guide  
service technicians in accurately and quickly troubleshooting  
the system and determining root cause for the failure.  
Inputs to the CADM include 24-vac power, demand signal Y,  
compressor contactor coil (common side) and compressor  
power leads (from the compressor contactor).  
ALERT  
(YEL)  
TRIP  
Input  
Control Power  
Terminal Voltage  
(RED)  
R
C
24-V  
24-V  
Fig. 30 — CADM Housing/LED Locations  
Control  
Common  
The ALERT LED indicates an abnormal condition exists in the  
system through a flash code. The ALERT LED will blink a  
number of times consecutively, pause and the repeat the  
process. The number of blinks, defined in Table 14, correlates  
to a particular abnormal condition; troubleshooting tips are  
provided for each Alert code. Reset of the ALERT may be  
automatic or manual. If the fault condition causing the Alert is  
self-corrected, the Alert code will be removed and the CADM  
will automatically reset and allow the system to restart  
normally. Manual reset for lockouts requires that main power  
to the 38AUQ unit be recycled after the cause for the Alert  
condition has been detected and corrected.  
The TRIP LED indicates either a time-delay period is currently  
active (RED LED is blinking) or the module has locked out the  
compressor (RED LED is on steady). A lockout condition will  
occur for some faults as identified in Table 14. Reset of the  
TRIP LED requires that unit main power be recycled after the  
loss of power to the compressor condition has been detected  
and corrected.  
Demand  
Y
P
T1  
T2  
T3  
24-V  
24-V  
Line  
Line  
Line  
Contactor Coil  
Compressor T1  
Compressor T2  
Compressor T3  
Control of the compressor contactor coil is through a contact  
between terminals P and C.  
Communications of status and alert conditions is through three  
LEDs located on the top edge of the module housing (see  
Fig. 30): POWER (green), ALERT (yellow), and TRIP (red).  
The POWER LED indicates the presence of control power to  
the CADM.  
Simultaneous Blinking of YELLOW and RED LEDs indicates  
control power input to the CADM is low. Check control circuit  
transformer and wiring.  
Troubleshooting the CADM Wiring – Flashing LEDs also  
indicate wiring problems to the CADM. See Table 15 for  
discussion of additional LED flash codes and troubleshooting  
instructions.  
28  
 
Table 14 — LED Status Codes  
Status LED  
Status LED Description  
Status LED Troubleshooting Information  
Green “POWER” Module has power  
Supply voltage is present at module terminals  
Red “TRIP”  
LED On Solid  
Thermostat demand signal Y 1. Compressor protector is open  
is present, but the  
2. Condensing unit power disconnect is open  
3. Compressor circuit breaker or fuse(s) is open  
compressor is not running.  
4. Broken supply wires or connector is not  
making contact  
5. Compressor power wires not routed through  
Comfort Alert  
6. Compressor contactor has failed open  
Red “TRIP” LED The anti-short cycle timer (3 minutes), in module is preventing compressor  
Flashing restart.  
Module locks out compressor when compressor damaging ALERT code appears.  
Lockout ALERT codes are noted in the Status LED Description.  
During a compressor lock out, 24VAC power must be removed from module to manually reset.  
Yellow “ALERT”  
LED On Solid  
A short circuit or over current 1. Compressor contactor coil shorted  
condition exists on PROT  
2. Electrical load too high for PROT circuit  
terminal.  
(maximum 1 Amp)  
3. 24 V AC wired directly to PROT terminal  
Yellow “ALERT”  
Flash Code 2  
System Pressure Trip  
Discharge pressure out of  
limits or compressor  
overload (if no high pressure  
switch in system)  
1. High head pressure  
2. Condenser coil poor air circulation (dirty,  
blocked, damaged)  
3. Condenser fan is not running  
LOCKOUT  
4. If low pressure switch is open:  
Refer to Code 3 for troubleshooting  
Yellow “ALERT”  
Flash Code 3  
Short Cycling  
Compressor is running only  
briefly LOCKOUT  
1. If low pressure switch is open:  
a. Low refrigerant charge  
b. Evaporator blower is not running  
c. Evaporator coil is frozen  
d. Faulty metering device  
e. Condenser coil is dirty  
f. Liquid line restriction (filter drier blocked if  
present)  
2. If high pressure switch is open, go to Flash  
Code 2 information  
3. Intermittent thermostat demand signal  
4. System or control board defective  
Yellow “ALERT”  
Flash Code 4  
Locked Rotor  
LOCKOUT  
1. Low line voltage to compressor  
2. Excessive liquid refrigerant in compressor  
3. Compressor bearings are seized  
Yellow “ALERT”  
Flash Code 5  
Open Circuit  
1. Condensing unit power disconnect is open  
2. Compressor circuit breaker or fuses are open  
3. Compressor contactor has failed open  
4. High pressure switch is open and requires  
manual reset  
5. Broken supply wires or connector is not  
making contact  
6. Unusually long compressor protector reset  
time due to extreme ambient temperature  
7. Compressor windings are damaged  
1. Compressor fuse is open on one phase  
2. Broken wire or connector on one phase  
3. Compressor motor winding is damaged  
4. Utility supply has dropped one phase  
Yellow “ALERT”  
Flash Code 6  
Missing Phase  
LOCKOUT  
Yellow “ALERT”  
Flash Code 7  
Reverse Phase  
LOCKOUT  
1. Compressor running backward due to supply  
phase reversal  
Yellow “ALERT”  
Flash Code 8  
Welded Contactor  
Compressor always runs  
1. Compressor contactor has failed closed  
2. Thermostat demand signal not connected to  
module  
Yellow “ALERT”  
Flash Code 9  
Low Voltage  
Control circuit < 18VAC  
1. Control circuit transformer is overloaded  
2. Low line voltage to compressor  
29  
 
Table 15 — CADM Troubleshooting  
Miswired Module Indication  
Recommended Troubleshooting Action  
Green LED is not on,  
module does not power up  
Determine if both R and C module terminals are  
connected. Verify voltage in present at module’s R and C  
terminals.  
NOTE: The CADM requires a constant nominal 24VAC  
power supply. The wiring to the module’s R and C  
terminals must be directly from the control transformer.  
The module cannot receive its power from another device  
that will interrupt the 24VAC power supply. See Fig. 19,  
the 38AUQ Wiring Diagram.  
Green LED Intermittent,  
module powers up only  
when compressor runs  
Determine if R and Y terminals are wired in reverse. Verify  
module’s R and C terminals have a constant source. See  
NOTE” above for details on R and C wiring.  
TRIP LED is on but system  
and compressor check OK  
Verify Y terminal is wired properly per the 38AUQ wiring  
diagram (see Fig. 19). Verify voltage at contactor coil falls  
below 0.5VAC when off. Verify 24VAQC is present across  
Y and C when thermostat demand signal is present. If not,  
R and C are reverse wired.  
TRIP LED and ALERT LED  
flashing together  
Verify R and C terminals are supplied with 19-28VAC.  
ALERT Flash Code 3  
(Compressor Short Cycling)  
displayed incorrectly  
Verify Y terminal is connected to 24VAC at contactor coil.  
Verify voltage at contactor coil falls below 0.5VAC when  
off.  
ALERT Flash Code 5 or 6  
(Open Circuit, Missing Phase)  
displayed incorrectly  
Check that compressor T1 and T3 wires are through  
module’s current sensing holes. Verify Y terminal is  
connected to 24VAC at contactor coil. Verify voltage at  
contactor coil falls below 0.5VAC when off.  
Alert Flash Code *  
(Welded Contactor)  
displayed incorrectly  
Determine if module’s Y terminal is connected. Verify Y  
terminal is connected to 24VAC at contactor coil. Verify  
24VAC is present across Y and C when thermostat  
demand signal is present. If not, R and C are reverse  
wired. Verify voltage at contactor coil falls below 0.5VAC  
when off.  
Lubrication  
FAN MOTORS have sealed bearings. No provisions are made  
for lubrication.  
COMPRESSOR has its own oil supply. Loss of oil due to a  
leak in the system should be the only reason for adding oil after  
the system has been in operation.  
PERSONAL INJURY AND UNIT DAMAGE  
HAZARD  
Failure to follow this caution may result in personal injury  
or equipment damage.  
Only approved cleaning is recommended.  
Outdoor Coil Maintenance and Cleaning  
Recommendation  
Routine Cleaning of Indoor Coil Surfaces  
Periodic cleaning with Totaline environmentally sound coil  
Routine cleaning of coil surfaces is essential to maintain proper  
operation of the unit. Elimination of contamination and remov-  
al of harmful residues will greatly increase the life of the coil  
and extend the life of the unit. The following maintenance and  
cleaning procedures are recommended as part of the routine  
maintenance activities to extend the life of the coil.  
®
cleaner is essential to extend the life of coils. This cleaner is  
available from Carrier Replacement Components Division as  
part number P902-0301 for one gallon container, and part num-  
ber P902-0305 for a 5 gallon container. It is recommended that  
all coils, including standard aluminum, pre-coated, copper/cop-  
per or E-coated coils be cleaned with the Totaline environmen-  
tally sound coil cleaner as described below. Coil cleaning  
should be part of the unit's regularly scheduled maintenance  
procedures to ensure long life of the coil. Failure to clean the  
coils may result in reduced durability in the environment.  
Remove Surface Loaded Fibers  
Surface loaded fibers or dirt should be removed with a vacuum  
cleaner. If a vacuum cleaner is not available, a soft non-metallic  
bristle brush may be used. In either case, the tool should be  
applied in the direction of the fins. Coil surfaces can be easily  
damaged (fin edges can be easily bent over and damage the  
coating of a protected coil) if the tool is applied across the fins.  
Avoid the use of  
• coil brighteners  
NOTE: Use of a water stream, such as a garden hose,  
against a surface loaded coil will drive the fibers and dirt  
into the coil. This will make cleaning efforts more difficult.  
Surface loaded fibers must be completely removed prior to  
using low velocity clean water rinse.  
• acid cleaning prior to painting  
• high pressure washers  
• poor quality water for cleaning  
Totaline environmentally sound coil cleaner is nonflammable,  
hypoallergenic, non bacterial, and a USDA accepted biode-  
gradable agent that will not harm the coil or surrounding com-  
ponents such as electrical wiring, painted metal surfaces, or in-  
sulation. Use of non-recommended coil cleaners is strongly  
discouraged since coil and unit durability could be affected.  
Periodic Clean Water Rinse  
A periodic clean water rinse is very beneficial for coils that are  
applied in coastal or industrial environments. However, it is  
very important that the water rinse is made with very low ve-  
locity water stream to avoid damaging the fin edges. Monthly  
cleaning as described below is recommended.  
30  
 
Clean coil as follows:  
1. Turn off unit power, tag disconnect.  
2. Remove top panel screws on outdoor coil end of unit.  
3. Remove coil corner post. To hold top panel open, place  
coil corner post between top panel and center post.  
4. Remove screws securing coil to compressor plate and  
compressor access panel.  
5. Use a water hose or other suitable equipment to flush  
down the coil to remove dirt and debris. Clean the outer  
surfaces with a stiff brush in the normal manner.  
6. Remove the coil corner post from between the top panel  
and center post. Reinstall the coil corner post and replace  
all screws.  
Totaline Environmentally Sound Coil Cleaner  
Application Instructions  
1. Proper eye protection such as safety glasses is recom-  
mended during mixing and application.  
2. Remove all surface loaded fibers and dirt with a vacuum  
cleaner as described above.  
3. Thoroughly wet finned surfaces with clean water and a  
low velocity garden hose, being careful not to bend fins.  
1
4. Mix Totaline environmentally sound coil cleaner in a 2 /  
2
gallon garden spryer according to the instructions includ-  
ed with the cleaner. The optimum solution temperature is  
100°F (38°C).  
NOTE: Do NOT USE water in excess of 130°F (54°C), as  
the enzymatic activity will be destroyed.  
Totaline Environmentally Sound Coil Cleaner  
5. Thoroughly apply Totaline environmentally sound coil  
cleaner solution to all coil surfaces including finned area,  
tube sheets and coil headers.  
6. Hold garden sprayer nozzle close to finned areas and ap-  
ply cleaner with a vertical, up-and-down motion. Avoid  
spraying in horizontal pattern to minimize potential for  
fin damage.  
7. Ensure cleaner thoroughly penetrates deep into finned ar-  
eas.  
8. Interior and exterior finned areas must be thoroughly  
cleaned.  
9. Finned surfaces should remain wet with cleaning solution  
for 10 minutes.  
10. Ensure surfaces are not allowed to dry before rinsing. Re-  
apply cleaner as needed to ensure 10-minute saturation is  
achieved.  
Application Equipment  
1
• 2- / gallon garden sprayer  
2
• Water rinse with low velocity spray nozzle  
UNIT DAMAGE HAZARD  
Failure to follow this caution may result in corrosion and  
damage to the unit.  
Harsh chemicals, household bleach or acid or basic clean-  
ers should not be used to clean outdoor or indoor coils of  
any kind. These cleaners can be very difficult to rinse out of  
the coil and can accelerate corrosion at the fin/tube inter-  
face where dissimilar materials are in contact. If there is dirt  
below the surface of the coil, use the Totaline environmen-  
tally sound coil cleaner as described above.  
11. Thoroughly rinse all surfaces with low velocity clean wa-  
ter using downward rinsing motion of water spray nozzle.  
Protect fins from damage from the spray nozzle.  
UNIT DAMAGE HAZARD  
Failure to follow this caution may result in reduced unit  
performance.  
High velocity water from a pressure washer, garden hose,  
or compressed air should never be used to clean a coil. The  
force of the water or air jet will bend the fin edges and in-  
crease airside pressure drop.  
Service Parts  
Listings of service parts for all units are available from the Re-  
placement Components Division’s Electronic Parts Informa-  
tion Catalog (EPIC). EPIC is available at Totaline stores, dis-  
tributor and service office parts departments and on-line at  
HVACPartners.com.  
When entering EPIC, the full unit model number is required.  
The model number includes the Design Revision reference val-  
ue (see Fig. 2, Position 13). The unit model number is available  
from the unit’s information data plate. (Do not use the “catalog  
number” when using EPIC. The “catalog number” suppresses  
the Design Revision value; failure to include Design Revision  
value may cause an incorrect unit parts list to be displayed.)  
When using EPIC, enter first four digits of the model number  
only. Find appropriate model from sales packages listed. Be  
sure to choose correct voltage and Design Revision.  
EPIC is a product of RCD. To comment of the EPIC program,  
use the “Comment” button inside the EPIC program.  
FASTENER TORQUE VALUES  
Table 16 — Torque Values  
Compressor mounting bolts  
65–75 in–lbs  
20 ±2 in–lbs  
84 ±2 in–lbs  
96 ±10 in–lbs  
2–3 in–lbs  
(734–847 N–cm)  
(226 ±23 N–cm)  
(949 ±136 N–cm)  
(1085 ±23 N–cm)  
(23–34 N–cm)  
Condenser fan motor mounting bolts  
Condenser fan hub setscrew  
High-flow service port  
Schrader-type service check valve  
31  
 
TROUBLESHOOTING  
PROBLEM  
CAUSE  
REMEDY  
Compressor and  
Outdoor Fan  
Will Not Start.  
Power failure.  
Call power company.  
Fuse blown or circuit breaker tripped.  
Replace fuse or reset circuit breaker. Determine root cause.  
Replace component.  
Defective thermostat, contactor, transformer,  
control relay, or capacitor.  
Insufficient line voltage.  
Determine cause and correct.  
Incorrect or faulty wiring.  
Check wiring diagram and rewire correctly.  
Lower thermostat setting below room temperature.  
See problem ``Excessive head pressure.''  
Check system for leaks. Repair as necessary.  
See problem ``Suction pressure too low.''  
Thermostat setting too high.  
High pressure switch tripped.  
Low pressure switch tripped.  
Freeze-up protection thermostat tripped.  
Compressor Will Not  
Start But Outdoor  
Fan Runs.  
Faulty wiring or loose connections in compressor Check wiring and repair or replace.  
circuit.  
Compressor motor burned out, seized, or  
internal overload open.  
Determine cause. Replace compressor or allow enough time for  
internal overload to cool and reset.  
Defective run/start capacitor, overload, start  
relay.  
Determine cause and replace compressor.  
One leg of 3-phase power dead.  
Refrigerant overcharge or undercharge.  
Defective compressor.  
Replace fuse or reset circuit breaker. Determine cause.  
Recover refrigerant, evacuate system, and recharge to nameplate.  
Replace and determine cause.  
Compressor Cycles  
(Other Than  
Normally Satisfying  
Thermostat).  
Insufficient line voltage.  
Determine cause and correct.  
Blocked outdoor coil or dirty air filter.  
Determine cause and correct.  
Defective run/start capacitor, overload, or start  
relay.  
Determine cause and replace.  
Defective thermostat.  
Replace thermostat.  
Replace.  
Faulty outdoor-fan (cooling) or indoor-fan  
(heating) motor or capacitor.  
Restriction in refrigerant system.  
Locate restriction and remove.  
Replace filter.  
Compressor Operates Dirty air filter.  
Continuously.  
Unit undersized for load.  
Decrease load or increase unit size.  
Reset thermostat.  
Thermostat set too low (cooling).  
Low refrigerant charge.  
Locate leak; repair and recharge.  
Recover refrigerant, evacuate system, and recharge.  
Clean coil or remove restriction.  
Air in system.  
Outdoor coil dirty or restricted.  
Compressor rotating in the wrong direction.  
Compressor Makes  
Excessive Noise.  
Reverse the 3-phase power leads as described in  
Start-Up.  
Excessive Head  
Pressure.  
Dirty outside air or return air filter (heating).  
Dirty outdoor coil (cooling).  
Replace filter.  
Clean coil.  
Refrigerant overcharged.  
Recover excess refrigerant.  
Recover refrigerant, evacuate system, and recharge.  
Determine cause and correct.  
Check for leaks; repair and recharge.  
Replace compressor.  
Air in system.  
Condensing air restricted or air short-cycling.  
Low refrigerant charge.  
Head Pressure  
Too Low.  
Compressor scroll plates defective.  
Restriction in liquid tube.  
Remove restriction.  
Excessive Suction  
Pressure.  
High heat load.  
Check for source and eliminate.  
Replace compressor.  
Compressor scroll plates defective.  
Refrigerant overcharged.  
Recover excess refrigerant.  
Replace filter.  
Suction Pressure  
Too Low.  
Dirty air filter (cooling).  
Dirty or heavily iced outdoor coil (heating).  
Low refrigerant charge.  
Clean outdoor coil. Check defrost cycle operation.  
Check for leaks; repair and recharge.  
Remove source of restriction.  
Increase air quantity. Check filter and replace if necessary.  
Reset thermostat.  
Metering device or low side restricted.  
Insufficient indoor airflow (cooling mode).  
Temperature too low in conditioned area.  
Field-installed filter drier restricted.  
Outdoor ambient below 25°F (cooling).  
Outdoor fan motor(s) not operating (heating).  
Replace.  
Install low?ambient kit.  
Check fan motor operation.  
32  
 
• Do not install a suction-line filter drier in liquid-line.  
• POE oils absorb moisture rapidly. Do not expose oil to  
atmosphere.  
• POE oils may cause damage to certain plastics and  
roofing materials.  
APPENDIX A  
AIR CONDITIONER AND HEAT PUMP WITH  
PURON® QUICK REFERENCE GUIDE  
®
• Puron (R-410A) refrigerant operates at 50 percent to  
70 percent higher pressures than R-22. Be sure that  
servicing equipment and replacement components are  
• Wrap all filter driers and service valves with wet cloth  
when brazing.  
• A factory approved, liquid-line filter drier is required on  
every unit.  
®
designed to operate with Puron .  
®
• Puron refrigerant cylinders are rose colored.  
• Recovery cylinder service pressure rating must be 400  
• Do not use an R-22 TXV.  
psig, DOT 4BA400 or DOT BW400.  
• If indoor unit is equipped with a TXV, it must be  
®
®
• Puron  
systems should be charged with liquid  
changed to a Puron TXV.  
refrigerant. Use a commercial type metering device in  
the manifold hose when charging into suction line with  
compressor operating.  
• Never open system to atmosphere while it is under a  
vacuum.  
• When system must be opened for service, recover  
refrigerant, break vacuum with dry nitrogen before  
opening system.  
• Manifold sets should be 700 psig high side and 180 psig  
low side with 550 psig low-side retard.  
• Use hoses with 700 psig service pressure rating.  
• Always replace filter drier after opening system for  
service.  
• Leak detectors should be designed to detect HFC  
refirgerant.  
®
• Do not vent Puron into the atmosphere.  
®
• Puron , as with other HFCs, is only compatible with  
• Do not use capillary tube coils.  
POE oils.  
• Observe all warnings, cautions, and bold text.  
Vacuum pumps will not remove moisture from oil.  
• Use only factory specified liquid-line filter driers with  
rated working pressures greater than 600 psig.  
®
• All Puron heat pumps must have indoor TXV.  
®
• Do not leave Puron suction line driers in place for  
more than 72 hours.  
APPENDIX B  
WIRING DIAGRAM LIST  
38AUQ  
Size  
*07  
Electrical Characteristics  
208/230-3-60  
460-3-60  
Diagram Number  
38AU500363  
38AU500362  
38AU500435  
38AU500363  
38AU500362  
38AU500435  
38AU500363  
38AU500362  
38AU500435  
575-3-60  
208/230-3-60  
460-3-60  
575-3-60  
208/230-3-60  
460-3-60  
*08  
*12  
575-3-60  
33  
 
APPENDIX C  
MOTORMASTER SENSOR LOCATIONS  
MOTOR MASTER SENSOR  
MUST BE POSITIONED  
ON VAPOR STUB  
MOTOR MASTER SENSOR  
MUST BE POSITIONED  
ON VAPOR STUB  
MOTOR MASTER SENSOR  
MUST BE POSITIONED  
BETWEEN METERING DEVICE  
(SECOND FROM TOP)  
(FOURTH FROM TOP)  
(FOURTH FROM TOP)  
AND TUBE SHEET  
6T HEAT PUMP  
7.5T HEAT PUMP  
10T HEAT PUMP  
Fig. 31 Motormaster Sensor Locations per Unit Size  
Copyright 2009 Carrier Corp • 7310 W. Morris St. • Indianapolis, IN 46231  
Printed in U.S.A.  
Edition Date: 09/09  
Catalog No: 38AUQ-01SI  
Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.  
Replaces: New  
34  
 
III. START UP  
START-UP CHECKLIST  
I. PRELIMINARY INFORMATION  
OUTDOOR: MODEL NO.  
SERIAL NO.  
SERIAL NO.  
INDOOR: AIR HANDLER MANUFACTURER  
MODEL NO.  
ADDITIONAL ACCESSORIES  
II. PRE-START-UP  
OUTDOOR UNIT  
IS THERE ANY SHIPPING DAMAGE?  
IF SO, WHERE:  
(Y/N)  
WILL THIS DAMAGE PREVENT UNIT START-UP?  
(Y/N)  
CHECK POWER SUPPLY. DOES IT AGREE WITH UNIT?  
(Y/N)  
HAS THE GROUND WIRE BEEN CONNECTED?  
(Y/N)  
HAS THE CIRCUIT PROTECTION BEEN SIZED AND INSTALLED PROPERLY?  
ARE THE POWER WIRES TO THE UNIT SIZED AND INSTALLED PROPERLY?  
(Y/N)  
(Y/N)  
CONTROLS  
ARE THERMOSTAT AND INDOOR FAN CONTROL WIRING CONNECTIONS MADE AND CHECKED?  
(Y/N)  
ARE ALL WIRING TERMINALS (including main power supply) TIGHT?  
HAS CRANKCASE HEATER BEEN ENERGIZED FOR 24 HOURS?  
(Y/N)  
(Y/N)  
INDOOR UNIT  
HAS WATER BEEN PLACED IN DRAIN PAN TO CONFIRM PROPER DRAINAGE?  
ARE PROPER AIR FILTERS IN PLACE? (Y/N)  
HAVE FAN AND MOTOR PULLEYS BEEN CHECKED FOR PROPER ALIGNMENT?  
(Y/N)  
(Y/N)  
DO THE FAN BELTS HAVE PROPER TENSION?  
(Y/N)  
HAS CORRECT FAN ROTATION BEEN CONFIRMED?  
(Y/N)  
PIPING  
ARE LIQUID LINE SOLENOID VALVES LOCATED AT THE INDOOR COILS AS REQUIRED?  
(Y/N)  
HAVE LEAK CHECKS BEEN MADE AT COMPRESSOR, OUTDOOR AND INDOOR COILS,  
TXVs (Thermostatic Expansion Valves), SOLENOID VALVES, FILTER DRIERS, AND FUSIBLE PLUGS  
WITH A LEAK DETECTOR?  
(Y/N)  
LOCATE, REPAIR, AND REPORT ANY LEAKS.  
HAVE LIQUID LINE SERVICE VALVES BEEN OPENED?  
HAVE SUCTION SERVICE VALVES BEEN OPENED?  
(Y/N)  
(Y/N)  
CHECK VOLTAGE IMBALANCE  
LINE-TO-LINE VOLTS:  
(AB + AC + BC)/3 = AVERAGE VOLTAGE =  
MAXIMUM DEVIATION FROM AVERAGE VOLTAGE =  
AB  
V
AC  
V
BC  
V
V
V
VOLTAGE IMBALANCE = 100 X (MAX DEVIATION)/(AVERAGE VOLTAGE) =  
IF OVER 2% VOLTAGE IMBALANCE, DO NOT ATTEMPT TO START SYSTEM!  
CALL LOCAL POWER COMPANY FOR ASSISTANCE.  
CL-1  
 
CHECK INDOOR UNIT FAN SPEED AND RECORD.  
CHECK OUTDOOR UNIT FAN SPEED AND RECORD.  
AFTER AT LEAST 10 MINUTES RUNNING TIME, RECORD THE FOLLOWING MEASUREMENTS:  
SUCTION PRESSURE  
SUCTION LINE TEMP  
LIQUID PRESSURE  
LIQUID LINE TEMP  
ENTERING OUTDOOR UNIT AIR TEMP  
LEAVING OUTDOOR UNIT AIR TEMP  
INDOOR UNIT ENTERING-AIR DB (dry bulb) TEMP  
INDOOR UNIT ENTERING-AIR WB (wet bulb) TEMP  
INDOOR UNIT LEAVING-AIR DB TEMP  
INDOOR UNIT LEAVING-AIR WB TEMP  
COMPRESSOR AMPS (L1/L2/L3)  
/
/
NOTES:  
Copyright 2009 Carrier Corp • 7310 W. Morris St. • Indianapolis, IN 46231  
Printed in U.S.A.  
Edition Date: 11/09  
Catalog No: 38AUQ-01SI  
Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.  
Pg CL-2  
Replaces: New  
 

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