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Installation, Start-Up and Service Instructions
CONTENTS
SAFETY CONSIDERATIONS . . . . . . . . . . . . . . . . . . . 2
Detection of Flammable Refrigerants . . . . . . . . . . . . 3
Ignition Source Mitigation . . . . . . . . . . . . . . . . . . . . . 3
Ventilation Requirements . . . . . . . . . . . . . . . . . . . . . . 3
INSTALLATION GUIDELINES . . . . . . . . . . . . . . . . . . . 3
GENERAL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Rated Indoor Airflow (cfm) . . . . . . . . . . . . . . . . . . . . . 3
INSTALLATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Jobsite Survey . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Step 1 - Plan for Unit Location . . . . . . . . . . . . . . . . 8
Step 2 - Complete Pre-Installation Checks . . . . . . 8
Step 3 - Prepare Unit Mounting Support . . . . . . . . 8
Step 4 - Rig and Mount the Unit . . . . . . . . . . . . . . . 8
Step 5 - Check Refrigerating Equipment . . . . . . . . 9
Step 6 - Determine Refrigerant Line Sizes . . . . . . . . . 9
Connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Step 8 - Install Accessories . . . . . . . . . . . . . . . . . . 15
Step 9 - Complete Electrical Connections . . . . . . 15
Convenience Outlets . . . . . . . . . . . . . . . . . . . . . . . . 18
Installing Weatherproof Cover . . . . . . . . . . . . . . . . . 18
Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations.
Catalog No. 04-53380058-01
Printed in U.S.A.
Form No. 38AXQ-7-12-01SI
Heat Pump Condensing Units
with Puron Advance™ (R-454B) Refrigerant
Page
PRE-START-UP . . . . . . . . . . . . . . . . . . . . . . . . . . . . .20
System Check . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .20
Turn On Crankcase Heater . . . . . . . . . . . . . . . . . . . .20
Preliminary Charge . . . . . . . . . . . . . . . . . . . . . . . . . .20
START-UP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .20
38AXQ Units . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .20
OPERATING SEQUENCE . . . . . . . . . . . . . . . . . . . . .25
Base Unit Controls . . . . . . . . . . . . . . . . . . . . . . . . . .25
MAINTENANCE . . . . . . . . . . . . . . . . . . . . . . . . . . . . .26
(and 30 days after initial start) . . . . . . . . . . . . . . .26
Seasonal Maintenance . . . . . . . . . . . . . . . . . . . . . . .26
SERVICE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .27
Refrigeration System . . . . . . . . . . . . . . . . . . . . . . . . .27
Compressor Protection . . . . . . . . . . . . . . . . . . . . . . .30
38AXQ*07-12 Gemini™
Pg 1
2-25
Replaces: NEW
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Summary of Contents for Carrier Gemini 38AXQ 07 Series
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Page 1: Table Of Contents
38AXQ*07-12 Gemini™ Heat Pump Condensing Units with Puron Advance™ (R-454B) Refrigerant Installation, Start-Up and Service Instructions • FIELD CONTROL WIRING CONTENTS • THERMOSTAT Page • EXTERNAL CONTROL DEVICES SAFETY CONSIDERATIONS ....2 Step 10 —... -
Page 2: Appendix A - Quick Reference Guide - Air Conditioner And Heat Pump With Puron
• CONTROL CIRCUIT, 24-V Commercial Defrost Control ....30 DANGER • REVERSING VALVE CONTROL • COMPRESSOR CONTROL ELECTRICAL SHOCK HAZARD • DEFROST Failure to follow this warning will result in personal injury or •... -
Page 3: Detection Of Flammable Refrigerants
Ventilation Requirements Unit Label Safety Symbols Ensure that the area is in the open or that it is adequately ventilated before breaking into the system or conducting any hot work. A de- This symbol shows that the appliance gree ventilation shall continue during the period that work is car- used a flammable refrigerant. - Page 4 10 11 12 13 14 15 16 17 18 3 8 A X Q M 1 2 A 0 A 5 0 A 0 A 0 Model Type Packaging 38AX = Carrier Condensing Unit 0 = Standard Puron Advance™ R-454B Refrigerant Electrical Options Heat Pump...
- Page 5 Fig. 3 — 38AXQ*07-12 Unit Dimensions...
- Page 6 Table 2 — 38AXQ Corner Weights STD. UNIT CENTER OF GRAVITY UNIT HEIGHT CORNER A CORNER B CORNER C CORNER D 38AXQ in. (mm) in. (mm) UNIT 22 (558.8) 25 (635.0) 13 (330.2) 42-3/8 (1076.0) 21 (533.4) 24 (609.6) 23 (584.2) 50-3/8 (1279.2) 21 (533.4) 24 (609.6)
- Page 7 Table 4 — Physical Data — 38AXQ*07-12 Units — SI UNIT 38AXQM/N07 38AXQM/N08 38AXQM/N12 Nominal Capacity (kW) 21.1 26.4 35.1 Operating Weights (kg) Aluminum-Fin Coils Refrigeration System R-454B R-454B R-454B No. Circuits / No. Comp. / Type 1 / 1 / Scroll 1 / 1 / Scroll 1 / 1 / Scroll Shipping Charge A/B (kg)
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Page 8: Installation
INSTALLATION Step 2 — Complete Pre-Installation Checks CHECK UNIT ELECTRIC CHARACTERISTIC Jobsite Survey Complete the following checks before installation. Confirm before installation of unit that voltage, amperage and cir- cuit protection requirements listed on unit data plate agree with Consult local building codes and the NEC (National Electri- power supply provided. -
Page 9: Step 5 - Check Refrigerating Equipment
Raise from above to lift the unit from the rails or pad when unit Carrier System Design Manual for additional data and information is in its final position. on equivalent lengths. After the unit is in position, remove all shipping materials and Table 5 —... - Page 10 Table 7 — Suction Line Diameter — Condenser Above Evaporator a,b,c SUCTION LINEAR LENGTH (ft) 0-25 26-50 51-75 76-100 NOMINAL UNIT CIRCUITS RISER TONNAGE EQUIV. LINEAR LENGTH (ft) 0-37 38-74 75-112 113-149 TYPE Nominal Nominal Allowable Nominal Allowable Nominal Allowable Suction Line Dia.
- Page 11 Table 8 — Liquid Line Diameter — Condenser Below Evaporator LINEAR LENGTH (ft) 0-25 26-50 51-75 76-100 NOMINAL UNIT CIRCUITS TONNAGE EQUIV. LINEAR LENGTH (ft) 0-37 38-74 75-112 113-149 Nominal Nominal Allowable Nominal Allowable Nominal Allowable Liquid Line Dia. (in.) 38AXQ*07 40RLQA07 Max.
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Page 12: Liquid Lift
LIQUID LIFT A liquid lift condition exists when the liquid flows vertically up in a portion of the liquid line. The vertical column of liquid re- duces the available state point sub-cooling at the evaporator coil’s thermal expansion valve. This effect reduces the length of liquid lift (feet of elevation) that a liquid line size can accommo- date. -
Page 13: Liquid Line Riser
LIQUID LINE RISER coil’s thermostatic expansion valve (TXV) inlets. The 38AXQ units include one Puron Advance™-duty filter drier, shipped in Refer to Piping Recommendations, Table 5; observe Max Lift lim- cartons attached to the unit basepan. Remove the filter drier and its for liquid line according to unit mode, equivalent line length prepare to install in the liquid line at the indoor coil. -
Page 14: Install Liquid Line Solenoid Valves
INSTALL LIQUID LINE SOLENOID VALVES Connect a source for nitrogen to one of these service fittings during tube brazing to prevent the formation of copper oxides in- It is recommended that a bi-directional solenoid valve be placed in side the tubes at brazed joints. the main liquid line (see Fig. -
Page 15: Preliminary Charge
NEC (National Electrical Code); ANSI/NFPA 70, latest For linear line lengths longer than 100 ft (30.5 m), contact your lo- edition (in Canada, Canadian Electrical Code CSA [Canadian cal Carrier representative for system charge value. Standards Association] C22.1), and local electrical codes. A2L CHARGING REQUIREMENTS... -
Page 16: Units Without Factory-Installed Disconnect
4 ga AWG per pole. imbalance constitutes abuse and may cause damage to electrical Provide a ground-fault and short-circuit over-current protection components. Such operation would invalidate any applicable device (fuse or breaker) per NEC Article 440 (or local codes). Carrier warranty. - Page 17 Table 19 — Electrical Data — 38AXQ*07-12 Units COMPRESSOR WITHOUT POWERED CONVENIENCE OUTLET NOMINAL POWER VOLTAGE SUPPLY RANGE No. 1 OFM (ea) Power Supply Disconnect Size UNIT Fuse or V-Ph-Hz HACR Brkr 208/230-3-60 19.2 38AXQM/N07 460-3-60 575-3-60 208/230-3-60 26.3 38AXQM/N08 460-3-60 10.9 575-3-60...
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Page 18: Convenience Outlets
Convenience Outlets WARNING ELECTRICAL OPERATION HAZARD Failure to follow this warning could result in personal injury or death. Units with convenience outlet circuits may use multiple dis- connects. Check convenience outlet for power status before opining unit for service. Locate its disconnect switch, if appro- priate, and open it. -
Page 19: Field Control Wiring
Remainder of the system controls connection will vary according to the specific construction details of the indoor section. Figure 16 depicts typical connections to a Carrier 40RLQ fan coil unit. Plan for field connections carefully and install control wiring correctly per the project plan. -
Page 20: Step 10 - Wind Baffles For Low Ambient Control
Step 10 — Wind Baffles for Low Ambient Control CAUTION 38AXQN units include 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 21: Advanced Scroll Temperature Protection (Astp)
The unit must be charged in Cooling mode only. Refer to Cooling Charging Charts, Fig. 19-21. For applications with line lengths greater than 100 ft, contact Carrier representative. Vary refrigerant Fig. 17 — Advanced Scroll Temperature Protection until the conditions of the chart are met. The charts are based on... - Page 22 6 Tons Dual Stage Heat Pump R- 454B CHARGING CHART (Unit must run the compressors and outdoor fans on high speed) 59.9 48.8 Add Charge if Above the Curve 37.7 26.6 Remove Charge if Below the Curve 15.5 -6.7 1034 1379 1723 2068...
- Page 23 7.5 Tons Dual Stage Heat Pump R- 454B CHARGING CHART (Unit must run the compressors and outdoor fans on high speed) 59.9 48.8 Add Charge if Above the Curve 37.7 26.6 Remove Charge if Below the Curve 15.5 -6.7 1034 1379 1723 2068...
- Page 24 10 Tons Dual Stage Heat Pump R - 454B CHARGING CHART (Unit must run both compressors and outdoor fan on high speed) 59.9 Add Charge if Above the Curve 48.8 37.7 26.6 Remove Charge if Below the Curve 15.5 -6.7 1034 1379 1723...
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Page 25: Operating Sequence
temperature falls below 60°F (16°C) to ensure continuous OPERATING SEQUENCE operation in both stages. The outdoor fan will turn back on Base Unit Controls when the temperature rises above 65°F (18°C). INDOOR (SUPPLY) FAN COOLING, UNIT WITH ECONOMIZER If the thermostat fan operation is selected as Continuous, then the Refer to fan coil unit installation instructions and economizer ac- indoor (supply) fan motor, which is remotely located in the fan cessory installation instructions for operating sequences when sys-... -
Page 26: Supplemental Heat/Emergency Heat
NOTE(S): tion for further details. 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. Monthly maintenance items and outdoor unit rinsing may be performed by the customer. -
Page 27: Service
Synthetic Roof Precautionary Procedure: SERVICE Cover extended roof working area with an impermeable Refrigeration System polyethylene (plastic) drop cloth or tarp. Cover an approxi- mate 10 x 10 ft (3.3 x 3.3 m) area. Cover area in front of the unit service panel with a terry cloth CAUTION shop towel to absorb lubricant spills and prevent run-offs, and EQUIPMENT DAMAGE HAZARD... -
Page 28: Outdoor Coil Metering Devices
OUTDOOR COIL METERING DEVICES Outdoor Fan 2 The metering devices are multiple fixed-bore devices (Acutrol ™1 swaged into the horizontal outlet tubes from the liquid header, Outdoor Fan 1 located at the entrance to each outdoor coil circuit path. These are non-adjustable. - Page 29 Outdoor Coil Outdoor Coil Defrost Defrost Thermostat Thermostat (DFT) (DFT) High Flow Access Ports High Flow Fig. 26 — 38AXQ*08 Interior Access Ports Fig. 27 — 38AXQ*12 Interior Seat 1/2-20 UNF RH 0.596 30° 5/8" Hex Core (Part No. EC39EZ067) 45°...
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Page 30: Compressor Protection
discharge tube. Trip setting is 630 ±10 psig (4344 ±69 kPa) when Compressor Protection hot. Reset is automatic at 505 ±20 psig (3482 ±140 kPa). COMPRESSOR OVERCURRENT LOSS OF CHARGE SWITCH The compressor has internal limbered motor protection. The system is protected against a loss of charge and low evapora- COMPRESSOR OVERTEMPERATURE PROTECTION (IP) tor coil loading condition by a loss of charge switch located on the liquid line. -
Page 31: Reversing Valve Control
Table 23 — DFB Power: 24-V at Pin P3-1, COM at P3-3 (required in all modes) MODE INPUTS AND OFF After DEFROST OUTPUTS COOL OFF After COOL HEAT-1 HEAT-2 HEAT-1 During HEAT INPUTS P2-5 24-V P2-7 24-V 24-V 24-V May be OPEN or May be OPEN or May be OPEN or DFT1-DFT1... -
Page 32: Defrost Thermostat
During the Heating mode, this tube location contains cold evapo- rating fluid entering the outdoor coil’s evaporator circuit; during Defrost/Cooling mode, this tube location contains condensed liq- uid or mixed-phase condensing refrigerant entering the subcooler circuit. A surface temperature below 30°F during Heating mode indicates the potential to form frost or ice on the outdoor coil;... -
Page 33: Comfort Alert Diagnostic Module
COMFORT ALERT DIAGNOSTIC MODULE Power (GRN) The Comfort Alert Diagnostic Module (CADM) monitors and an- Comfort Alert ™ alyzes data from the Copeland Scroll ®1 three-phase compressor Commercial Diagnostics POWER Green LED - 24VAC Power and the thermostat demand. The CADM also provides a 3-minute Yellow LED - Flash Code System Pressure Trip anti-recycle time delay to compressor cycling. - Page 34 Table 26 — 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 35 The compressor has its own oil supply. Loss of oil due to a leak in the life of coils. This cleaner is available from Carrier Replace- the system should be the only reason for adding oil after the sys- ment Components Division as part number P902-0301 for one tem has been in operation.
- Page 36 Avoid the use of: • coil brighteners • acid cleaning prior to painting Rigid • high pressure washers Support • poor quality water for cleaning Cover Totaline coil cleaner is nonflammable, hypoallergenic, non bacte- rial, and a USDA accepted biodegradable agent that will not harm the coil or surrounding components such as electrical wiring, painted metal surfaces, or insulation.
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Page 37: Fastener Torque Values
Empty recovery cylinders are evacuated and, if possible cooled Service Parts before recovery occurs. Listings of service parts for all units are available from the Re- The recovery equipment shall be in good working order with a set placement Components Division’s Parts Information Catalog of instructions concerning the equipment that is at hand and shall (PIC). - Page 38 Table 29 — 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.
- Page 39 If a vacuum is not possible, make a manifold so that refriger- DECOMMISSIONING ant can be removed from various parts of the system. Before carrying out this procedure, it is essential that the techni- Make sure that the cylinder is situated on the scales before cian is completely familiar with the equipment and all its detail.
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Page 40: Appendix B - Wiring Diagrams
APPENDIX A — QUICK REFERENCE GUIDE — AIR CONDITIONER AND HEAT PUMP WITH PURON ADVANCE™ • Puron Advance™ (R-454B) refrigerant operates at 50 per- • POE oils may cause damage to certain plastics and roofing cent to 70 percent higher pressures than R-22. Be sure that materials. - Page 41 APPENDIX B — WIRING DIAGRAM (cont) Fig. A — 38AXQ*07-12 Wiring Diagram (208/230-3-60, 460-3-60 shown)
- Page 42 APPENDIX B — WIRING DIAGRAM (cont) Fig. B — 38AXQ*07-12 Wiring Diagram (575-3-60 shown)
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Page 43: Appendix C - Low Ambient Option - Factory Installed
APPENDIX C — LOW AMBIENT OPTION — FACTORY INSTALLED Units with the factory installed low ambient option are equipped Troubleshooting 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 44 APPENDIX C — LOW AMBIENT OPTION — FACTORY INSTALLED (cont) Low ambient sensor must be positioned Low ambient sensor on feeder tube Low ambient sensor must be positioned (fourth from top) must be positioned on feeder tube between header and on feeder tube (fourth from top) tube sheet...
- Page 45 APPENDIX C — LOW AMBIENT OPTION — FACTORY INSTALLED (cont) NOTE: Dimensions are in inches. Fig. D — Wind Baffles...
- Page 46 © 2025 Carrier Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations. Catalog No. 04-53380058-01 Printed in U.S.A. Form No. 38AXQ-7-12-01SI Pg 46 2-25 Replaces: NEW...
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Page 47: Preliminary Information
START-UP CHECKLIST FOR 38AXQ*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: Check Voltage
__________________________________________________________________________________________________________ __________________________________________________________________________________________________________ __________________________________________________________________________________________________________ __________________________________________________________________________________________________________ __________________________________________________________________________________________________________ __________________________________________________________________________________________________________ © 2025 Carrier Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations. Catalog No. 04-53380058-01 Printed in U.S.A. Form No. 38AXQ-7-12-01SI Pg CL-2...
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