Page 1: Table Of Contents
38AUQ*07-12 Heat Pump Condensing Units with Puron ® Refrigerant Installation, Start-Up and Service Instructions CONTENTS System Check ......16 Turn On Crankcase Heater .
Page 2 Commercial Defrost Control ....26 WARNING • REVERSING VALVE CONTROL • COMPRESSOR CONTROL UNIT OPERATION AND SAFETY HAZARD • DEFROST • DEFROST THERMOSTAT Failure to follow this warning could cause personal injury, •...
Page 3: Evaluate Existing Refrigerant Piping
COOLING ONLY. Remove the suction line filter drier as soon as Remove the existing outdoor unit. Install the new outdoor possible, with a maximum of 72 hours of operation. unit according to these installation instructions. Recommendation: Install a ball valve in the liquid line at the filter Flush the interconnection piping system with dry Nitrogen to drier location when installing a suction filter in the suction line.
Page 4 Fig. 1 — 38AUQ*07-12 Unit Dimensions...
Page 5 Table 2 — Physical Data — 38AUQ*07-12 Units — 60 Hz English UNIT 38AUQD/E07 38AUQM/N08 38AUQD/E12 Nominal Capacity (tons) Operating Weights (lb) Aluminum-Fin Coils Refrigeration System R-410A R-410A R-410A No. Circuits / No. Comp. / Type 1 / 1 / Scroll 1 / 1 / Scroll 1 / 1 / Scroll Shipping Charge A/B (lb)
Page 6 10 11 12 13 14 15 16 17 18 3 8 A U Q E 1 2 A 0 A 5 - 0 A 0 A 0 Model Type Packaging 38AU = Carrier Condensing Unit 0 = Standard ® Puron R- 410A Refrigerant 1 = LTL...
Page 7: Installation
INSTALLATION Jobsite Survey Complete the following checks before installation. RIGHT: Min 18" (457 mm) REAR: Consult local building codes and the NEC (National Electri- required for service Min 18" (457 mm) required for service Code) ANSI/NFPA 70 special installation requirements. Determine unit location (from project plans) or select unit LEFT: Min 18"...
Page 8: Step 3 - Prepare Unit Mounting Support
28.8 30.7 33.4 37.2 NOTE(S): a. For applications with linear length greater than 100 ft (30.5 m), contact your local Carrier representative. LEGEND Length Equiv — Equivalent tubing length, including effects of refrigeration specialties devices Liquid Line — Tubing size, inches OD Max Lift Cool —...
Page 9: Check Vertical Separation
Check Vertical Separation maximum values; replace riser sections with these pipe sizes if necessary. If there is any vertical separation between the indoor and outdoor units, check to ensure that the separation is within allowable lim- Table 5 — Maximum Vapor Line Sizes its.
Page 10: Install Liquid Line Solenoid Valves
Install Liquid Line Solenoid Valves caps and cores and save for re-installation. Connect a source for nitrogen to one of these service fittings during tube brazing to pre- It is recommended that a bi-directional solenoid valve be placed in vent the formation of copper oxides inside the tubes at brazed the main liquid line (see Fig.
Page 11: Preliminary Charge
For linear line lengths longer than 100 ft (30.5 m), contact load side of the unit disconnect. On a unit without a unit-mounted your local Carrier representative for system charge value. disconnect, connect the source leads to compressor contactor C with unit field power leads.
Page 12: Units Without Factory-Installed Disconnect
Such operation would invalidate any applicable provided on the unit informative plate. Locate on unit cabinet or Carrier warranty. within sight of the unit per national or local codes. Do not cover unit informative plate if mounting the disconnect on the unit Convenience Outlets cabinet.
Page 13: Installing Weatherproof Cover
Figure 13 tripped condition. depicts typical connections to a Carrier 40RFQ fan coil unit. Plan for field connections carefully and install control wiring correctly Fuse on power type: The factory fuse is a Bussman ™1...
Page 14: External Control Devices
Control transformer TRAN2 provides control power through ter- minal A1 (9) to C for the liquid line solenoid. Maximum available power is 15 va. This output is switched ON/OFF by the Solenoid REFER Valve Relay (field-supplied, Carrier Service Part TO FAN COIL P/N HN61PC005). O/B/Y2...
Page 15 Table 10 — Electrical Data — 38AUQ*07-12 60 Hz Units NOMINAL COMPRESSOR WITHOUT POWERED CONVENIENCE OUTLET VOLTAGE POWER RANGE No. 1 No. 2 OFM (ea) Power Supply Disconnect Size SUPPLY UNIT Fuse or V-Ph-Hz HACR Brkr 208/230-3-60 17.5 — — 25/25 30/30 24/24...
Page 16: Step 8 - Wind Baffles For Low Ambient Control
Step 8 — Wind Baffles for Low Ambient Control CAUTION 38AUQN and 38AUQE units includes the factory installed low ambient controller. UNIT DAMAGE HAZARD Units with low ambient control require the addition of wind baf- Failure to follow this caution may result in equipment damage. fles to ensure full range low ambient operation.
Page 17: Advanced Scroll Temperature Protection (Astp)
Charging Charts, Fig. 16-18. For applications with line lengths Label greater than 100 ft, contact Carrier representative. Vary refrigerant until the conditions of the chart are met. The charts are based on charging the units to the correct subcooling for the various operat- ing conditions.
Page 18 6 TON HEAT PUMP DUAL STAGE CHARGING CHART PURON (COMPRESSOR FULL LOAD, ALL CONDENSER FANS OPERATING) Add Charge if Above the Curve Rem ove Charge if Below the Curve 1050 1400 1750 2100 2450 2800 3150 3500 3850 Pressure at Liquid Valve (PSIG / Kpa) PN: 38AU000485 REV - Fig.
Page 19 7.5 Ton Dual Stage Heat Pump Charging Chart R410a Refrigerant Add Charge if Above the Curve Rem ove Charge if Below the Curve 1050 1400 1750 2100 2450 2800 3150 3500 3850 Pressure at Liquid Valve (PSIG / Kpa) 38AU000063 Fig.
Page 20: Operating Sequence
PN: 38AU000486 REV - Fig. 18 — 38AUQD/E12 Charging Chart OPERATING SEQUENCE uses two compressors in tandem on a single circuit in conjunction with two single-stage Comfort Alert Modules (CADM). Base Unit Controls 38AUQ(D/E)07 and 38AUQ(M/N)08 INDOOR (SUPPLY) FAN When thermostat calls for Stage 1 Cooling, terminal Y1 is ener- gized.
Page 21: Fan Cycling
PL3-8 (COMP2, 24-v) is received at CADM terminal Y2. CADM FAN CYCLING DC SOL terminal outputs 24-vdc to the compressor loader plug The 38AUQ(D/E)12 is equipped with a temperature switch that (LDR) and the compressor operates at full load capacity. will shut down one outdoor fan in cooling mode when the outdoor As space cooling load is satisfied, thermostat outputs Y2 and Y1 temperature falls below 55°F (13°C) to ensure continuous...
Page 22: Supplemental Heat/Emergency Heat
Check gear and dampers for debris and dirt a. The above list may not include all maintenance items. Inspection intervals may vary depending on climate and opening hours. Consult your Carrier dealer about a service contact for seasonal inspections MAINTENANCE b.
Page 23: Service
The above list may not include all maintenance items. Inspection intervals may local codes. vary depending on climate and opening hours. Consult your Carrier dealer about a service contact for seasonal inspections b. Monthly maintenance items and outdoor unit rinsing may be performed by the LIQUID LINE FILTER DRIER customer.
Page 24: Outdoor Coil Metering Devices
Outdoor Fan 2 Outdoor Fan 2 Outdoor Fan 1 Outdoor Fan 1 Service Valves Service Fig. 19 — 38AUQ*07 Exterior Valves Fig. 21 — 38AUQ*12 Exterior Outdoor Fan 2 OUTDOOR COIL METERING DEVICES Outdoor Fan 1 The metering devices are multiple fixed-bore devices (Acutrol ™1 swaged into the horizontal outlet tubes from the liquid header, lo- cated at the entrance to each outdoor coil circuit path.
Page 25 Outdoor Coil Outdoor Coil Defrost Defrost Thermostat Thermostat (DFT) (DFT) High Flow Access Ports Fig. 22 — 38AUQ*07 Interior High Flow Access Ports Fig. 24 — 38AUQ*12 Interior Outdoor Coil Defrost Thermostat (DFT) Defrost Thermostat (DFT) High Flow Access Ports Fig.
Page 26: Compressor Protection
The crankcase heater will operate as long as the power circuit is Seat energized. The main disconnect must be on to energize the crank- case heater. 1/2-20 UNF RH IMPORTANT: Never open any switch or disconnect that 0.596 energizes the crankcase heater unless unit is being serviced or is to be shut down for a prolonged period.
Page 27 Table 13 — 38AUQ Defrost Board I/O and Jumper Configurations CONNECTION PIN POINT NAMES TYPE OF I/O UNIT CONNECTION NOTE NUMBER INPUTS G Fan DI, 24-vac P2-3 Not used Y1 Cool 1 DI, 24-vac P2-5 TB-Y1 W1 Heat 1 DI, 24-vac P2-7 TB-W1 Y2 Cool 2...
Page 28 Fig. 29 — DIP Switch Settings — Defrost Board At the end of the continuous run period, the defrost control will test for a need to defrost. DFT1 controls the start and termination of the defrost cycle. If DFT1 is still open, the defrost test/run win- dow is closed and the control repeats the continuous run period.
Page 29 Table 15 — Dip Switch Position SWITCH NO. • • • • • • • • • 30 minutes 60 minutes 90 minutes 120 minutes Delay For size 08 units, position the DFT on the Vapor Stub For size 12 units, (second from top) position the DFT For size 07 units,...
Page 30 COMFORT ALERT DIAGNOSTIC MODULE Power The Comfort Alert Diagnostic Module (CADM) monitors and an- (GRN) Comfort Alert ™ alyzes data from the Copeland Scroll ® three-phase compressor Commercial Diagnostics POWER and the thermostat demand. The CADM also provides a 3-minute Green LED - 24VAC Power Yellow LED - Flash Code System Pressure Trip...
Page 31 Table 16 — LED Status Codes STATUS LED STATUS LED STATUS LED DESCRIPTION TROUBLESHOOTING INFORMATION Green “POWER” Module has power Supply voltage is present at module terminals 1. Compressor protector is open 2. Condensing unit power disconnect is open Thermostat demand signal Y is present, but 3.
Page 32 This cleaner is avail- the system should be the only reason for adding oil after the sys- able from Carrier Replacement Components Division as part tem has been in operation. number P902-0301 for one gallon container, and part number...
Page 33 Avoid the use of: • coil brighteners • acid cleaning prior to painting Rigid • high pressure washers Support • poor quality water for cleaning Cover Totaline environmentally sound coil cleaner is nonflammable, hy- poallergenic, non bacterial, and a USDA accepted biodegradable agent that will not harm the coil or surrounding components such as electrical wiring, painted metal surfaces, or insulation.
Page 34 Service Parts FASTENER TORQUE VALUES Listings of service parts for all units are available from the Re- placement Components Division’s Electronic Parts Information 65-75 in.-lb  Compressor mounting bolts Catalog (EPIC). EPIC is available at Totaline stores, distributor (734-847 N-cm) service office parts...
Page 35 TROUBLESHOOTING PROBLEM CAUSE REMEDY Power failure. Call power company. Replace fuse or reset circuit breaker. Determine root Fuse blown or circuit breaker tripped. cause. Defective thermostat, contactor, transformer, control Replace component. relay, or capacitor. Insufficient line voltage. Determine cause and correct. Incorrect or faulty wiring.
Page 36 APPENDIX A — AIR CONDITIONER AND HEAT PUMP WITH PURON ® — QUICK REFERENCE GUIDE • Puron (R-410A) refrigerant operates at 50 percent to • POE oils may cause damage to certain plastics and roofing 70 percent higher pressures than R-22. Be sure that servic- materials.
Page 37 APPENDIX B — WIRING DIAGRAM LIST (CONT) Fig. A — 38AUQD/E07 Single Circuit / Two Stage Wiring Diagram (208/230, 460-3-60 shown)
Page 38 APPENDIX B — WIRING DIAGRAM LIST (CONT) Fig. B — 38AUQD/E07 Single Circuit / Two Stage Wiring Diagram (575-3-60 shown)
Page 39 APPENDIX B — WIRING DIAGRAM LIST (CONT) Fig. C — 38AUQM/N08 Single Circuit / Two Stage Wiring Diagram (208/230-3-60 shown)
Page 40 APPENDIX B — WIRING DIAGRAM LIST (CONT) Fig. D — 38AUQM/N08 Single Circuit / Two Stage Wiring Diagram (460-3-60 shown)
Page 41 APPENDIX B — WIRING DIAGRAM LIST (CONT) Fig. E — 38AUQM/N08 Single Circuit / Two Stage Wiring Diagram (575-3-60 shown)
Page 42 APPENDIX B — WIRING DIAGRAM LIST (CONT) Fig. F — 38AUQD/E12 Single Circuit / Two Stage Wiring Diagram (208/230, 460-3-60 shown)
Page 43 APPENDIX B — WIRING DIAGRAM LIST (CONT) Fig. G — 38AUQD/E12 Single Circuit / Two Stage Wiring Diagram (575-3-60 shown)
Page 44 APPENDIX C — LOW AMBIENT OPTION — FACTORY INSTALLED Troubleshooting Units with the factory installed low ambient option are equipped with a solid-state head pressure control which regulates fan speed. A temperature sensor, mounted on circuit 1 of the outdoor coil OBSERVATION POSSIBLE REMEDY (see Fig.
Page 45 APPENDIX C — LOW AMBIENT OPTION — FACTORY INSTALLED (CONT) Low ambient sensor must be positioned Low ambient sensor on vapor stub Low ambient sensor must be positioned (fourth from top) must be positioned on vapor stub between (fourth from top) metering device (second from top) and tube sheet...
Page 46 APPENDIX C — LOW AMBIENT OPTION — FACTORY INSTALLED (CONT) Fig. I — Wind Baffles © 2023 Carrier Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations. Catalog No. 04-53380047-01 Printed in U.S.A.
Page 47 START-UP CHECKLIST FOR 38AUQ*07-12 HEAT PUMP CONDENSING UNIT (Remove and use for job file) NOTE: To avoid injury to personnel and damage to equipment or property when completing the procedures listed in this start-up checklist, use good judgment, follow safe practices, and adhere to the safety considerations/information as outlined in preceding sections of this Installation, Start-Up and Service Instruction document.
Page 48 __________________________________________________________________________________________________________ __________________________________________________________________________________________________________ __________________________________________________________________________________________________________ __________________________________________________________________________________________________________ __________________________________________________________________________________________________________ __________________________________________________________________________________________________________ © 2023 Carrier Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations. Catalog No. 04-53380047-01 Printed in U.S.A. Form 38AUQ-7-12-04SI Pg CL-2 1-23...

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