Page 1: Table Of Contents
38AUQ Heat Pump Condensing Units 60 Hz With Puron (R---410A) Refrigerant Sizes 16 --- 25 Installation, Start---Up and Service Instructions CONTENTS SAFETY CONSIDERATIONS ....SERVICE .
Page 2: Safety Considerations
SAFETY CONSIDERATIONS WARNING Improper installation, adjustment, alteration, service, PERSONAL INJURY AND ENVIRONMENTAL maintenance, or use can cause explosion, fire, electrical HAZARD shock or other conditions which may cause personal injury or property damage. Consult a qualified installer, Failure to follow this warning could cause personal service agency, or your distributor or branch for injury or death.
Page 3 7. Operate the system for 10 hr. Monitor the pressure CAUTION drop across the suction line filter drier. If pressure drop exceeds 3 psig (21kPa), replace suction-line and UNIT DAMAGE HAZARD liquid-line filter driers. Be sure to purge system with dry nitrogen and evacuate when replacing filter Failure to follow this caution may result in equipment driers.
Page 4 C10675 Fig. 2 - - 38AUQ*25 Unit Dimensions...
Page 5 Table 1A — Physical Data — 38AUQ*16-25 Units — 60 Hz English UNIT SIZE 38AUQ* NOMINAL CAPACITY (tons) ‡ REFRIGERANT SYSTEM Refrigerant Puron (R--- 410A) # Circuits / # Compressor / Type 2 / 2 / Scroll 2 / 2 / Scroll Shipping Charge A/B (lb) 9.0/9.0 9.0/9.0...
Page 6 Table 1B — Physical Data — 38AUQ*16-25 Units — 60 Hz SI UNIT SIZE 38AUQ* NOMINAL CAPACITY (kW) ‡ REFRIGERANT SYSTEM Refrigerant Puron (R--- 410A) # Circuits / # Compressor / Type 2 / 2 / Scroll 2 / 2 / Scroll Shipping Charge A/B (kg) 4.1/4.1 4.1/4.1...
Page 7: Installation
3 8 A U Q A 2 5 A 0 C 6 – 0 A 0 A 0 _____________ ____ Model Type Packaging 38AU= Carrier Condensing Unit 0 = Standard Puronr R--- 410A Refrigerant 1 = LTL Type of Coil...
Page 8: Step 2 - Complete Pre-Installation Checks
Do not install the outdoor unit in an area where fresh air S The unit may be mounted on a level pad directly on the supply to the outdoor coil may be restricted or when base channels or mounted on raised pads at support recirculation from the condenser fan discharge is possible.
Page 9 (where applicable) NOTE: For applications with equivalent length greater than 188 ft (57 m) and/0r linear length greater than 125 ft (38 m), contact your local Carrier representative. Check Vertical Separation — 38AUQ units include two Puron-duty filter driers, shipped in cartons attached to the unit basepan.
Page 10 Table 3 – Puron-duty Filter Drier(s) Liquid Desiccant Part Model-Size Line OD Volume Number Ref 38AUQ*16 16 cu. in. KH43LG089 38AUQ*25 16 cu. in. KH43LG089 Table 4 – Refrigerant Specialties Part Numbers LIQUID LINE LIQUID LINE SOLENOID SIGHT FILTER SIZE (in.) SOLENOID VALVE (LLSV) COIL GLASS...
Page 11 Closed cell foam insulation with a thermal conductivity of: 0.28 Btu S 24.6 - - 9.0 = 15.6 lbs in./ft S h S °F (0.04 W/m S °C). For linear line lengths longer than 125 ft (38.1 m), contact your local Carrier representative for system charge value.
Page 12: Step 6 - Install Accessories
Step 6 — Install Accessories NOTE: TEST LEADS - Unit may be equipped with short leads (pigtails) on the field line connection points on Accessories requiring modifications to unit wiring should contactor C or optional disconnect switch. These leads are be completed now.
Page 13 HACR breaker switch; this will provide electrical components. Such operation would invalidate service power to the unit when the unit disconnect switch any applicable Carrier warranty. or HACR switch is open. Other connection methods will Convenience Outlets result in the convenience outlet circuit being de-energized when the unit disconnect or HACR switch is open.
Page 14 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).
Page 15 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 (Note 1) instructions.
Page 16 Table 7 – Electrical Data — 38AUQ*15- - 25 60 Hz Units COMPRESSOR NO C.O. or UNPWRD C.O. NOMINAL VOLTAGE POWER RANGE UNIT No. 1 No. 2 POWER SUPPLY DISCONNECT SIZE SUPPLY SIZE FUSE or 38AUQ V--- Ph--- Hz HACR (ea) BRKR 208/230---3---60...
Page 17: Pre-Start-Up
PRE-START-UP CAUTION IMPORTANT: Before beginning Pre-Start-Up or UNIT DAMAGE HAZARD Start-Up, review Start-Up Checklist at the back of this book. The Checklist assures proper start-up of a Failure to follow this caution may result in equipment damage. unit and provides a record of unit condition, application requirements, system information, and Prior to starting compressor, a preliminary charge of operation at initial start-up.
Page 18 Motormaster function. Adjust Refrigerant Charge — The unit must be charged in Cooling mode only. Refer to Cooling Charging Charts, Figs. 16 and 17. For applications with line lengths greater than 100 ft, contact Carrier representative. Vary refrigerant until conditions of the chart are met.
Page 19 C10784 Fig. 16 - - 38AUQ*16 Charging Chart...
Page 20 C10785 Fig. 17 - - 38AUQ*25 Charging Chart...
Page 21 C10786 Fig. 18 - - 38AUQ*16 Power Schematic (208/230-3-60 shown)
Page 22 C10787 Fig. 19 - - 38AUQ*25 Power Schematic (208/230-3-60 shown)
Page 23 C10788 Fig. 20 - - 38AUQ*16/25 Control Schematic...
Page 24: Operating Sequence
OPERATING SEQUENCE Heating — When the thermostat calls for first stage heating, terminal Base Unit Controls W1 is energized. The 38AUQ’s Defrost Board (DFB) receives this input at P2-7. The DFB removes the output Indoor (Supply) Fan — at P3-7 (RVS1); the reversing valve solenoid is The indoor fan contactor (IFC) is remotely located at the de-energized and the reversing valve moves to Heating fan coil or fan section.
Page 25: Supplemental Heating/Emergency Heating
During the Defrost cycle, output EHEAT is also energized S Wire terminal tightness (if not already energized by a thermostat W2 demand); S Refrigerant charge level supplemental heater will be energized. During the Defrost Cycle, LED1 on the DFB will be illuminated. The Defrost Economizer or Outside Air Damper cycle ends when DFT opens (as liquid temperature exiting S Inlet filters condition...
Page 26: Liquid Line Filter Driers
Outdoor Coil Metering Devices — 2. Cover area in front of the unit service panel with a terry cloth shop towel to absorb lubricant spills and The metering devices are multiple fixed–bore devices prevent run-offs, and protect drop cloth from tears (Acutrol™) swaged into the horizontal outlet tubes from caused by tools or components.
Page 27: Compressor Protection
Compressor Protection Charge Switch trip setting is 27 psig ± 3 psig (186 ±21 kPa). Reset is automatic at 44 ±5 psig (303 ± 35 kPa). Compressor Overcurrent — The factory installed loss of charge pressure switch (LOC) The compressor has internal limbered motor protection. has open/close settings which do not provide indoor coil freeze protection.
Page 28 Reversing Valve Control — The DFB has two outputs for unit reversing valve control. Operation of the reversing valves is based on internal logic; this application does not use an “O” or “B” signal to determine reversing valve position. Reversing valves are energized during the Cooling stages and de-energized during Heating cycles.
Page 29 Defrost — If the space heating load is satisfied and compressor operation is terminated, the defrost control will remember The defrost control mode is a time/temperature sequence. where the run period was interrupted. On restart in Heating, There are two time components: The continuous run the defrost control will resume unit operation at the point in period and the test/defrost cycle period.
Page 30 Fans Service Valves C10791 Fig. 26 - - 38AUQ*16 Exterior Outdoor Coil Outdoor Coil Defrost Thermostat High Flow (DFT) Access Ports Defrost Thermostat (DFT) C10792 Fig. 27 - - 38AUQ*16 Interior...
Page 31 Fans Service Valves C10793 Fig. 28 - - 38AUQ*25 Exterior Outdoor Coil Outdoor Coil Defrost Thermostat High Flow (DFT) Access Port High Flow Access Port Defrost Thermostat (DFT) C10794 Fig. 29 - - 38AUQ*25 Interior...
Page 32: Comfort Alert Diagnostic Module
Comfort Alert Diagnostic Module POWER (GRN) The Comfort Alert Diagnostic Module (CADM) monitors and analyzes data from the Copeland Scroll® three-phase compressor 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.
Page 33 Table 10 – LED Status Codes Status LED Status LED Description Status LED Troubleshooting Information Green “POWER” Module has power Supply voltage is present at module terminals Compressor protector is open Red “TRIP” LED On Solid Thermostat demand signal Y is present, but the Condensing unit power disconnect is open compressor is not running.
Page 34: Outdoor Fans
Table 11 – CADM Troubleshooting Miswired Module Indication Recommended Troubleshooting Action Green LED is not on, Determine if both R and C module terminals are connected. Verify voltage in module does not power up present at module’s R and C terminals. NOTE: The CADM requires a constant nominal 24VAC power supply.
Page 35 This Application Instructions: cleaner available from Carrier Replacement NOTE: Proper eye protection such as safety glasses is Components Division as part number P902-0301 for one recommended during mixing and application.
Page 36: Service Parts
Service Parts 5. Mix Totaline environmentally sound coil cleaner in a gallon garden sprayer according to the instruc- Listings of service parts for all units are available from the tions included with the cleaner. The optimum solution Replacement Components Division’s Electronic Parts temperature is 100°F (38°C).
Page 37: Troubleshooting
TROUBLESHOOTING PROBLEM CAUSE REMEDY Compressor and Power failure. Call power company. Outdoor Fan Fuse blown or circuit breaker tripped. Replace fuse or reset circuit breaker. Determine root cause. Will Not Start. Defective thermostat, contactor, transformer, Replace component. control relay, or capacitor. Insufficient line voltage.
Page 38: Air Conditioner And Heat Pump With Puron Quick Reference Guide
APPENDIX A S Do not install a suction-line filter drier in liquid-line. S POE oils absorb moisture rapidly. Do not expose oil to AIR CONDITIONER AND HEAT PUMP atmosphere. ® — WITH PURON QUICK REFERENCE S POE oils may cause damage to certain plastics and GUIDE roofing materials.
Page 39: Low Ambient Option - Factory Installed
APPENDIX C Low Ambient Option — Factory Installed Troubleshooting — OBSERVATION POSSIBLE REMEDY Units with the factory installed low ambient option are Fans won’t start All fans: equipped with a Motormaster solid- - state head pressure Check power & wiring control which regulates fan speed.
Page 40 Motormaster Sensor - Must be positioned on Vapor Stub (Fourth from Top) Motormaster Sensor - Must be positioned on Vapor Stub (Fourth from Top) C10795 C10796 Fig. 33 - - Motormaster Sensor Location: Fig. 34 - - Motormaster Sensor Location: 38AUQ*16 38AUQ**25 Table 13 –...
Page 46 Catalog No: 38AUQ---03SI Copyright 2010 Carrier Corp. D 7310 W. Morris St. D Indianapolis, IN 46231 Printed in U.S.A. Edition Date: 08/10 Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations. Replaces: New...
Page 47: Start Up Checklist
START UP CHECKLIST I. PRELIMINARY INFORMATION OUTDOOR: MODEL NO. SERIAL NO. INDOOR: AIRHANDLER MANUFACTURER MODEL NO. SERIAL NO. ADDITIONAL ACCESSORIES II. PRE-START-UP OUTDOOR UNIT IS THERE ANY SHIPPING DAMAGE? (Y/N) IF SO, WHERE: WILL THIS DAMAGE PREVENT UNIT START-UP? (Y/N) CHECK POWER SUPPLY.
Page 48 COMPRESSOR 2 AMPS (L1/L2/L3) NOTES: Catalog No: 38AUQ---03SI Copyright 2010 Carrier Corp. D 7310 W. Morris St. D Indianapolis, IN 46231 Printed in U.S.A. Edition Date: 08/10 Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.

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