Carrier 38AUQ - Manual

Installation, Start-Up and
Service Instructions
CONTENTS
SAFETY CONSIDERATIONS . . . . . . . . . . . . . . . . . . . . . . . 1
INSTALLATION GUIDELINES. . . . . . . . . . . . . . . . . . . . . . . 2
INSTALLATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-14
Step 1 – Plan for Unit Location . . . . . . . . . . . . . . . . . . . 7
Step 2 – Complete Pre-Installation Checks. . . . . . . . . . 7
Step 3 – Prepare Unit Mounting Support . . . . . . . . . . 7
Step 4 – Rig and Mount the Unit . . . . . . . . . . . . . . . . . . 7
Step 5 – Complete Refrigerant Piping Connections . . . 7
Step 6 – Install Accessories. . . . . . . . . . . . . . . . . . . . . . 10
Step 7 – Complete Electrical Connections . . . . . . . . . 10
PRE-START-UP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
System Check . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Turn On Crankcase Heater . . . . . . . . . . . . . . . . . . . . . . 15
Preliminary Charge. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
START-UP. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15 -18
38AUQ Units . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
OPERATING SEQUENCE. . . . . . . . . . . . . . . . . . . . . . . . . . 19
Indoor (Supply) Fan . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
Cooling Unit Without Economizer. . . . . . . . . . . . . . . . . 19
Cooling, Unit With Economizer . . . . . . . . . . . . . . . . . . . 19
Heating. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
Supplemental Heating/Emergency Heating . . . . . . . . 19
Defrost Cycle . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
Cooling and Heating Shutdown. . . . . . . . . . . . . . . . . 19
ROUTINE SYSTEM MAINTENANCE. . . . . . . . . . . . . . . 20
Quarterly Inspection (and 30 days after initial start) . . 20
SERVICE. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .20 - 31
Refrigeration System . . . . . . . . . . . . . . . . . . . . . . . . . 20
Compressor Oil. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
Servicing Systems on Roofs with
Synthetic Materials. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
Liquid Line Filter Drier . . . . . . . . . . . . . . . . . . . . . . . . . 21
Filed Refrigerant Access Ports . . . . . . . . . . . . . . . . . 21
Outdoor Coil Metering Devices. . . . . . . . . . . . . . . . . 21
Refrigerant System Pressure Access Ports . . . . . . . . 21
Heat Pump Controls. . . . . . . . . . . . . . . . . . . . . . . . . . 22
Commercial Defrost Board . . . . . . . . . . . . . . . . . . . . . . 22
Crankcase Heater . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
Compressor Protection. . . . . . . . . . . . . . . . . . . . . . . . . . 22
Low-Pressure Switches . . . . . . . . . . . . . . . . . . . . . . . . . 33
Comfort Alert Diagnostic Module . . . . . . . . . . . . . . 28
Lubrication . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
Outdoor Coil Maintenance and Cleaning
Recommendations . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
Service Parts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
Fastener Torque Values . . . . . . . . . . . . . . . . . . . . . . . 31
TROUBLESHOOTING . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
APPENDIX A
Air Conditioner and Heat Pump with Puron ® –
Quick Reference Guide . . . . . . . . . . . . . . . . . . . . . . . 33
APPENDIX B
Wiring Diagram List. . . . . . . . . . . . . . . . . . . . . . . . . 33
APPENDIX C
Motormaster Sensor Locations. . . . . . . . . . . . . . . . . 34
START-UP CHECKLIST . . . . . . . . . . . . . . . . . . . .CL-1, CL-2
SAFETY CONSIDERATIONS
Improper installation, adjustment, alteration, service,
maintenance, or use can cause explosion, fire, electrical shock
or other conditions which may cause personal injury or
property damage. Consult a qualified installer, service agency,
or your distributor or branch for information or assistance. The
qualified installer or agency must use factory-authorized kits or
accessories when modifying this product. Refer to the
individual instructions package
Follow all safety codes. Wear safety glasses and work gloves.
Use quenching cloths for brazing operations and have a fire
extinguisher available. Read these instructions thoroughly and
follow all warnings or cautions attached to the unit. Consult
local building codes and appropriate national electrical codes
(in USA, ANSI/NFPA70, National Electrical Code (NEC); in
Canada, CSA C22.1) for special requirements.
It is important to recognize safety information. This is the
safety-alert symbol . When you see this symbol on the unit
and in instructions or manuals, be alert to the potential for
personal injury.
Understand the signal words DANGER, WARNING,
CAUTION, and NOTE. These words are used with the safety-
alert symbol. DANGER identifies the most serious hazards
which will result in severe personal injury or death.
WARNING signifies hazards which could result in personal
injury or death. CAUTION is used to identify unsafe practices,
which may result in minor personal injury or product and
property damage. NOTE is used to highlight suggestions
which will result in enhanced installation, reliability, or
operation.
38AUQ
Heat Pump Condensing Units
60 Hz
with Puron ® (R-410A) Refrigerant
Sizes 07, 08, and 12