Carrier 38AUQ- Manuals

10 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)...

11 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). NOTE: TEST LEADS - Uni...

12 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 swit...

13 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 ...

15 PRE-START-UP 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 w...

16 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 scrol...

19 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...

20 ROUTINE SYSTEM MAINTENANCE 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: Quarterly Inspection (and 30 days after initial start) Indoor section • Coil cleanliness checked.• ...

21 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 ...

22 Heat Pump Controls Compressor Protection Compressor Overcurrent The compressor has internal limbered motor protection. Compressor Overtemperature The compressor has an internal protector to protect it against excessively high discharge gas temperatures. High Pressure Switch The system is provided...

23 Fig. 21 — Defrost Control Board (DFB) Location Fig. 22 — Defrost Control Board (DFB) Arrangement Reversing valve control 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 ...

25 Fig. 24 — 38AUQ*07 Exterior Fig. 25 — 38AUQ*07 Interior Fans ServiceValves LOC HPS High FlowAccess Ports Outdoor Coil DefrostThermostat(DFT)

28 COMFORT ALERT DIAGNOSTIC MODULE 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 electric...

29 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 is present, but the compressor is not running. 1. Compressor protect...

30 Table 15 — CADM Troubleshooting 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. Outdoor Coil Maintenance ...

31 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 acce...

32 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. Defective thermostat, contactor, transformer, control relay, or capacitor. Replace...

33 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 designed to operate with Puron ® . • Puron ® refrigerant cy...

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 APPENDIX C MOTORMASTER SE...

CL-1 III. START UP START-UP CHECKLIST I. PRELIMINARY INFORMATION OUTDOOR: MODEL NO. SERIAL NO. INDOOR: AIR HANDLER 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) CH...