Carrier WEATHERMAKER 48/50AJ - Manual (Page 2)

2
CONTENTS (cont)
Page
Indoor Air Quality Control . . . . . . . . . . . . . . . . . . . . . . . . . . 67
• OPERATION
• SETTING UP THE SYSTEM
• PRE-OCCUPANCY PURGE
Dehumidification and Reheat
. . . . . . . . . . . . . . . . . . . . . . 69
• SETTING UP THE SYSTEM
• OPERATION
Temperature Compensated Start
. . . . . . . . . . . . . . . . . . . 71
• SETTING UP THE SYSTEM
• TEMPERATURE COMPENSATED START LOGIC
Carrier Comfort Network
® (CCN) System . . . . . . . . . . . 71
Alert Limit Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . 72
Sensor Trim Configuration . . . . . . . . . . . . . . . . . . . . . . . . . 73
Discrete Switch Logic Configuration . . . . . . . . . . . . . . . 74
Display Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 74
Remote Control Switch Input . . . . . . . . . . . . . . . . . . . . . . . 74
Hot Gas Bypass . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 75
Space Temperature Offset . . . . . . . . . . . . . . . . . . . . . . . . . 75
TIME CLOCK CONFIGURATION . . . . . . . . . . . . . . . . . 75-77
TROUBLESHOOTING . . . . . . . . . . . . . . . . . . . . . . . . . . 77-101
Complete Unit Stoppage . . . . . . . . . . . . . . . . . . . . . . . . . . . 77
Single Circuit Stoppage . . . . . . . . . . . . . . . . . . . . . . . . . . . . 77
Service Analysis . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 77
Restart Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 77
Thermistor Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . 77
Transducer Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . 78
Forcing Inputs and Outputs . . . . . . . . . . . . . . . . . . . . . . . . 90
Run Status Menu . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 90
• AUTO VIEW OF RUN STATUS
• ECONOMIZER RUN STATUS
• COOLING INFORMATION
• MODE TRIP HELPER
• CCN/LINKAGE DISPLAY TABLE
• COMPRESSOR RUN HOURS DISPLAY TABLE
• COMPRESSOR STARTS DISPLAY TABLE
• TIME GUARD DISPLAY TABLE
• SOFTWARE VERSION NUMBERS DISPLAY TABLE
Alarms and Alerts
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 93
MAJOR SYSTEM COMPONENTS . . . . . . . . . . . . . . 101-127
General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 101
Factory-Installed Components . . . . . . . . . . . . . . . . . . . . 101
Accessory Control Components . . . . . . . . . . . . . . . . . . 124
SERVICE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 128-139
Service Access . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 128
Cleaning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 128
Lubrication . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 130
Evaporator Fan Performance Adjustment . . . . . . . . . 130
Evaporator Fan Coupling Assembly . . . . . . . . . . . . . . . 130
Evaporator Fan Service and Replacement . . . . . . . . 131
Belt Tension Adjustment . . . . . . . . . . . . . . . . . . . . . . . . . . 131
Evaporator-Fan Motor Replacement . . . . . . . . . . . . . . . 131
Condenser-Fan Adjustment . . . . . . . . . . . . . . . . . . . . . . . 132
Four-Inch Filter Replacement . . . . . . . . . . . . . . . . . . . . . 132
Power Failure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 132
Refrigerant Charge . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 132
Thermostatic Expansion Valve (TXV) . . . . . . . . . . . . . . 132
Gas Valve Adjustment . . . . . . . . . . . . . . . . . . . . . . . . . . . . 132
Main Burners . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 139
Filter Drier . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 139
Replacement Parts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 139
APPENDIX A — LOCAL DISPLAY TABLES . . . . 140-147
APPENDIX B — CCN TABLES . . . . . . . . . . . . . . . . . 148-160
APPENDIX C — VFD INFORMATION . . . . . . . . . . . 161-169
APPENDIX D — MODE SELECTION
PROCESS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 170
APPENDIX E — UPC OPEN CONTROLLER . . . . 171-182
INDEX . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 183
CONTROLS SET POINT AND
CONFIGURATION LOG . . . . . . . . . . . . . . . . . . CL-1 to CL-5
UNIT START-UP CHECKLIST . . . . . . . . . . . . . . . . . . . . . CL-6
SAFETY CONSIDERATIONS
Installation and servicing of air-conditioning equipment can
be hazardous due to system pressure and electrical compo-
nents. Only trained and qualified service personnel should in-
stall, repair, or service air-conditioning equipment. Untrained
personnel can perform the basic maintenance functions of re-
placing filters. Trained service personnel should perform all
other operations.
When working on air-conditioning equipment, observe pre-
cautions in the literature, tags and labels attached to the unit,
and other safety precautions that may apply. Follow all safety
codes. Wear safety glasses and work gloves. Use quenching
cloth for unbrazing operations. Have fire extinguishers avail-
able for all brazing operations.
WARNING
Before performing service or maintenance operation on
unit turn off and lock off main power switch to unit.
Electrical shock can cause personal injury and death.
Shut off all power to this equipment during installation
and service. The unit may have an internal non-fused
disconnect or a field-installed disconnect. Note that the
unit may also be equipped with a convenience outlet,
that this outlet is wired to the line side of the unit-
mounted disconnect and will remain hot when the
disconnect in the unit is off. There is a separate fuse/
disconnect for the convenience outlet.
CAUTION
Puron ® refrigerant (R-410A) systems operate at higher
pressures than standard R-22 systems. Do not use R-22 ser-
vice equipment or components on Puron refrigerant equip-
ment. If service equipment is not rated for Puron
refrigerant, equipment damage or personal injury may
result.
CAUTION
This unit uses a microprocessor-based electronic control
system. Do not use jumpers or other tools to short out com-
ponents or to bypass or otherwise depart from recom-
mended procedures. Any short-to-ground of the control
board or accompanying wiring may destroy the electronic
modules or electrical components.
WARNING
1. Improper installation, adjustment, alteration, service,
or maintenance can cause property damage, personal
injury, or loss of life. Refer to the User’s Information
Manual provided with this unit for more details.
2. Do not store or use gasoline or other flammable va-
pors and liquids in the vicinity of this or any other
appliance.
What to do if you smell gas:
1. DO NOT try to light any appliance.
2. DO NOT touch any electrical switch, or use any phone
in your building.
3. IMMEDIATELY call your gas supplier from a neigh-
bor’s phone. Follow the gas supplier’s instructions.
4. If you cannot reach your gas supplier call the fire
department.