Page 1: Table Of Contents
38AUQ16-25 Heat Pump Condensing Units with Puron ® (R-410A) Refrigerant Installation, Start-Up and Service Instructions CONTENTS START-UP ........17 38AUQ Units .
Page 2: Safety Considerations
• DEFROST THERMOSTATS • INDOOR FAN OFF DELAY WARNING • DEFROST SPEEDUP FUNCTIONS Comfort Alert Diagnostic Module ....28 UNIT OPERATION AND SAFETY HAZARD Outdoor Fans ....... 30 Failure to follow this warning could cause personal injury, Lubrication .
Page 3: Acid Test
ACID TEST CAUTION If the existing system is being replaced because of a compres- sor electrical failure, assume acid is in system. If system is be- UNIT DAMAGE HAZARD ing replaced for any other reason, use an approved acid test kit Failure to follow this caution may result in equipment damage to determine acid level.
Page 4 STD. UNIT WT. CORNER A CORNER B CORNER C CORNER D CENTER OF GRAVITY UNIT HEIGHT UNIT LBS. LBS. LBS. LBS. LBS. 38AUQ16 39 [990.6] 20 [508] 23 [584.2] 50-3/8 [1279.2] CORNER "B" CORNER "C" CENTER OF GRAVITY DIRECTION OF AIR FLOW DIMENSIONS IN [ ] ARE IN MM 45-1/8 [1148]...
Page 5 Fig. 2 — 38AUQ*25 Unit Dimensions...
Page 6 Table 2 — Physical Data — 38AUQ*16-25 Units — 60 Hz English UNIT 38AUQ16 38AUQ25 NOMINAL CAPACITY (tons) OPERATING WEIGHTS (lb) Aluminum-Fin Coils 1015 REFRIGERATION SYSTEM Puron (R-410A) Puron (R-410A) ® No. Circuits / No. Comp. / Type 2 / 2 / Scroll 2 / 2 / Scroll Shipping Charge A/B (lb) 9.0 / 9.0...
Page 7 Table 3 — Physical Data — 38AUQ*16-25 Units — 60 Hz SI UNIT 38AUQ16 38AUQ25 NOMINAL CAPACITY (kW) 52.8 70.3 OPERATING WEIGHTS (kg) Aluminum-Fin Coils REFRIGERATION SYSTEM Puron (R-410A) Puron (R-410A) ® ® No. Circuits / No. Comp. / Type 2 / 2 / Scroll 2 / 2 / Scroll Shipping Charge A/B (kg)
Page 8 10 11 12 13 14 15 16 17 18 3 8 A U Q T 1 6 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 9: Installation
INSTALLATION UN-CRATE UNIT Remove unit packaging except for the top skid assembly, which Jobsite Survey should be left in place until after the unit is rigged into its final Complete the following checks before installation. location. Consult local building codes and the NEC (National Electri- INSPECT SHIPMENT Code) ANSI/NFPA 70 special...
Page 10: Check Vertical Separation
NOTE(S): a. For applications with equivalent length greater than 188 ft (57 m) and/or linear length greater than 125 ft (38 m), contact your local Carrier representative. b. AHRI ratings as listed as only valid with the piping diameters specified.
Page 11: Install Liquid Line Solenoid Valves
Table 6 — Refrigerant Specialties Part Numbers LIQUID LINE SIZE (in.) LIQUID LINE SOLENOID VALVE (LLSV) SOLENOID COIL SIGHT GLASS EF680035 plus EF680039 biflow kit EF680037 KM680004 EF680036 plus EF680039 biflow kit EF680037 KM680005 INSTALL LIQUID LINE SOLENOID VALVES It is recommended that bi-directional solenoid valves be placed in the main liquids line for circuits 1 and 2 (see Fig.
Page 12: Preliminary Charge
For linear line lengths longer than 125 ft (38.1 m), contact your lo- disconnect, connect the source leads to compressor contactor C cal Carrier representative for system charge value. with unit field power leads. All units except 208/230-v units are factory wired for the voltage Step 6 —...
Page 13: Units Without Factory-Installed Disconnect
Operation on improper line voltage or ex- Wire Only cessive phase imbalance constitutes abuse and may cause damage to electrical components. Such operation would invalidate any ap- Aluminum plicable Carrier warranty. Wire Convenience Outlets Fig. 8 — Disconnect Switch and Unit UNITS WITHOUT FACTORY-INSTALLED DISCONNECT...
Page 14: Installing Weatherproof Cover
H2 + H3 L2: GRA to the specific construction details of the indoor section. Figure 13 depicts typical connections to a Carrier 40RUQ fan coil unit. Plan L1: RED for field connections carefully and install control wiring correctly L2: GRA per the project plan.
Page 15: Thermostat
THERMOSTAT THERMOSTAT Install a Carrier-approved accessory thermostat according to in- OUTDOOR UNIT CONNECTION stallation instructions included with the accessory. For complete BOARD (TB) economizer function, select a two-stage cooling thermostat. Lo- cate the thermostat accessory on a solid wall in the conditioned...
Page 16 Table 9 — Electrical Data — 38AUQ*16-25 60 Hz Units COMPRESSOR WITHOUT POWERED CONVENIENCE OUTLET VOLTAGE NOMINAL RANGE No. 1 No. 2 OFM (ea) Power Supply Disconnect Size POWER UNIT Fuse or SUPPLY HACR (V-Ph-Hz) Brkr 208/230-3-60 26.8 25.0 67.8/67.8 90/90 70/70 342/342...
Page 17: Pre-Start-Up
PRE-START-UP START-UP 38AUQ Units The compressor crankcase heater must be on for 24 hours before IMPORTANT: Before beginning Pre-Start-Up or Start-Up, start-up. After the heater has been on for 24 hours, the unit can be review Start-Up Checklist at the back of this book. The started.
Page 18: Start Unit
The unit must be charged in Cooling mode only. Refer to Cooling Charging Charts, Fig. 16 and 17. For applications with line lengths 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 19 15 Ton Heat Pump Circuit A Charging Chart R-410A 15 Ton Heat Pump Circuit B Charging Chart R-410A Refrigerant Refrigerant Add Charge if Add Charge if Above the Curve Above the Curve Rem ove Charge if Rem ove Charge if Below the Curve Below the Curve 100 150 200 250 300 350 400 450 500 550 600...
Page 20: Operating Sequence
OPERATING SEQUENCE relay is de-energized. Liquid line solenoid valve LLSV1 is de-energized and valve closes. Compressor Lockout Relay and Base Unit Controls Loader Control Relay are de-energized. CADM1 begins its three- minute anti-recycle time delay. INDOOR (SUPPLY) FAN If either the Loss of Charge (LOC) Switch or High Pressure If the thermostat fan operation is selected as Continuous, then the Switch (HPS) on either circuit opens while Y1, Y2, or Y3 remain indoor (supply) fan motor, which is remotely located in the fan...
Page 21: Supplemental Heat/Emergency Heat
The above list may not include all maintenance items. Inspection intervals may temperature switch is bypassed through the Temperature Bypass vary depending on climate and opening hours. Consult your Carrier dealer Relay (TBR), ensuring that all fans run at full speed. See Fig. 18 about a service contact for seasonal inspections and 19 for outdoor fan labeling.
Page 22: Routine System Maintenance
The above list may not include all maintenance items. Inspection intervals may (POE) oil. This oil is extremely hygroscopic, meaning it vary depending on climate and opening hours. Consult your Carrier dealer absorbs water readily. POE oils can absorb 15 times as much about a service contact for seasonal inspections.
Page 23: Field Refrigerant Access Ports
FIELD REFRIGERANT ACCESS PORTS OUTDOOR COIL METERING DEVICES Field service access to refrigerant pressures is through the access The metering devices are multiple fixed-bore devices (Acutrol™) ports located at the service valves (see Fig. 18-19). These ports are swaged into the horizontal outlet tubes from the liquid header, lo- 1/4 in.
Page 24: Compressor Protection
CRANKCASE HEATER Outdoor Coil The heater prevents refrigerant migration and compressor oil dilu- tion during shutdown whenever compressor is not operating. The Outdoor Coil heater is wired to cycle with the compressor; the heater is off when compressor is running, and on when compressor is off. Defrost The crankcase heater will operate as long as the power circuit is Thermostat...
Page 25: Reversing Valve Control
LOC1 LPS1 HPS1 FPT1 CIRCUIT 1 NOTE: Move compressor contactor wire CIRCUIT 2 from right-side LPS terminal to right-side FPT terminal HPS2 LOC2 FPT2 LPS2 Fig. 23 — Field Wiring of Indoor Coil Freeze Protection Switch (FPT) (Dual Circuit Shown) REVERSING VALVE CONTROL The DFB has two outputs for unit reversing valve control.
Page 26 Table 12 — 38AUQ Defrost Board I/O and Jumper Configurations POINT NAME TYPE OF I/O CONNECTION PIN NO. UNIT CONNECTION NOTE 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 R Power...
Page 27: Defrost
DEFROST 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 The defrost control mode is a time/temperature sequence. There load is satisfied and compressor operation is terminated, the de- are two time components: The continuous run period and the frost control will remember where the run period was interrupted.
Page 28 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 and Commercial Diagnostics POWER the thermostat demand. The CADM also provides a 3-minute anti- Green LED - 24VAC Power Yellow LED - Flash Code recycle time delay to compressor cycling.
Page 29 Table 14 — 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 3. Compressor circuit breaker or fuse(s) is open Thermostat demand signal Y is present, but the Red “TRIP”...
Page 30 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 31 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, hypoallergenic, non bacterial, and a USDA accepted biodegrad- able agent that will not harm the coil or surrounding components such as electrical wiring, painted metal surfaces, or insulation.
Page 32 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 33 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 34 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 35 APPENDIX B — WIRING DIAGRAM LIST (CONT) Fig. A — 38AUQ*16 Power Schematic (208/230-3-60 shown)
Page 36 APPENDIX B — WIRING DIAGRAM LIST (CONT) Fig. B — 38AUQ*16 Power Schematic (460-3-60 shown)
Page 37 APPENDIX B — WIRING DIAGRAM LIST (CONT) Fig. C — 38AUQ*16 Power Schematic (575-3-60 shown)
Page 38 APPENDIX B — WIRING DIAGRAM LIST (CONT) Fig. D — 38AUQ*25 Power Schematic (208/230-3-60 shown)
Page 39 APPENDIX B — WIRING DIAGRAM LIST (CONT) Fig. E — 38AUQ*25 Power Schematic (460-3-60 shown)
Page 40 APPENDIX B — WIRING DIAGRAM LIST (CONT) Fig. F — 38AUQ*25 Power Schematic (575-3-60 shown)
Page 41 APPENDIX B — WIRING DIAGRAM LIST (CONT) Fig. G — 38AUQ*16-25 Control Schematic...
Page 42 APPENDIX C — LOW AMBIENT OPTION — FACTORY INSTALLED Troubleshooting Units with the factory installed low ambient option are equipped with a low ambient head pressure control which regulates fan speed. Two temperature sensors, mounted on circuits 1 and 2 of OBSERVATION POSSIBLE REMEDY the outdoor coil (see Fig.
Page 43 APPENDIX C — LOW AMBIENT OPTION — FACTORY INSTALLED (CONT) Low Ambient Sensor 2 Low Ambient Sensor 2 must be positioned must be positioned on Vapor Stub on Vapor Stub (fourth from top) (fourth from top) Low Ambient Sensor 1 Low Ambient Sensor 1 must be positioned must be positioned...
Page 44 APPENDIX C — LOW AMBIENT OPTION — FACTORY INSTALLED (CONT) Fig. J — Wind Baffles — Fabrication...
Page 45 APPENDIX C — LOW AMBIENT OPTION — FACTORY INSTALLED (CONT) Fig. K — 15 Ton Wind Baffle Brackets — Fabrication...
Page 46 APPENDIX C — LOW AMBIENT OPTION — FACTORY INSTALLED (CONT) TOP BRACKETS FRONT BOTTOM BRACKET BACK LEFT RIGHT Fig. L — Wind Baffle Installation — 15 Ton Units...
Page 47 APPENDIX C — LOW AMBIENT OPTION — FACTORY INSTALLED (CONT) FRONT LEFT BACK RIGHT Fig. M — Wind Baffle Installation — 20 Ton Units...
Page 50 © 2023 Carrier Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations. Catalog No. 04-53380048-01 Printed in U.S.A. Form 38AUQ-16-25-02SI Pg 50 1-23 Replaces: 38AUQ-16-25-01SI...
Page 51 START-UP CHECKLIST FOR 38AUQ*16-25 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 52 __________________________________________________________________________________________________________ __________________________________________________________________________________________________________ __________________________________________________________________________________________________________ __________________________________________________________________________________________________________ __________________________________________________________________________________________________________ __________________________________________________________________________________________________________ © 2023 Carrier Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations. Catalog No. 04-53380048-01 Printed in U.S.A. Form 38AUQ-16-25-02SI Pg CL-2 1-23...

Carrier 38AUQ16-25 Installation, Start-Up And Service Instructions Manual

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