Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations.
Catalog No. 04-53500224-01 Printed in U.S.A. Form 50KCQ-4-6-01SM Pg 1 2-2020 Replaces: NEW
Service and Maintenance Instructions
CONTENTS
SAFETY CONSIDERATIONS . . . . . . . . . . . . . . . . . . . . 1
UNIT ARRANGEMENT AND ACCESS. . . . . . . . . . . . . 3
General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Routine Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Seasonal Maintenance. . . . . . . . . . . . . . . . . . . . . . . . . 3
RETURN-AIR FILTERS . . . . . . . . . . . . . . . . . . . . . . . . . 3
Removing the Return Air Filters . . . . . . . . . . . . . . . . . 3
Re-installing the Access Panel . . . . . . . . . . . . . . . . . . 3
Outside-Air Hood . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Economizer Inlet Air Screen . . . . . . . . . . . . . . . . . . . . 4
Manual Outside Air Hood Screen . . . . . . . . . . . . . . . . 4
SUPPLY FAN (BLOWER) SECTION . . . . . . . . . . . . . . 4
Supply Fan (Direct-Drive) . . . . . . . . . . . . . . . . . . . . . . 4
Supply Fan (Belt-Drive) . . . . . . . . . . . . . . . . . . . . . . . . 6
HEAT PUMP REFRIGERATION SYSTEM . . . . . . . . . . 8
Outdoor Coil . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Indoor Coil . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Recommended Outdoor Coil Maintenance and
Cleaning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Reversing Valve and Checking Valve Position . . . . 10
Troubleshooting Refrigerant Pressure Problems and
Check Valves . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Metering Devices . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Refrigerant System Pressure Access Ports . . . . . . 14
PURON® (R-410A) REFRIGERANT. . . . . . . . . . . . . . 14
Refrigerant Charge. . . . . . . . . . . . . . . . . . . . . . . . . . . 14
COOLING CHARGING CHARTS . . . . . . . . . . . . . . . . 14
How To Use Cooling Charging Charts . . . . . . . . . . . 14
Compressors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Replacing the Compressor . . . . . . . . . . . . . . . . . . . . 18
Compressor Rotation . . . . . . . . . . . . . . . . . . . . . . . . 18
Filter Drier . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
Outdoor Fan Location . . . . . . . . . . . . . . . . . . . . . . . . 18
Troubleshooting Cooling System. . . . . . . . . . . . . . . 18
CONVENIENCE OUTLETS . . . . . . . . . . . . . . . . . . . . . 20
Convenience Outlet Types . . . . . . . . . . . . . . . . . . . . 20
Installing Weatherproof Cover . . . . . . . . . . . . . . . . . 20
HEAT PUMP CONTROLS. . . . . . . . . . . . . . . . . . . . . . 21
Central Terminal Board . . . . . . . . . . . . . . . . . . . . . . . 21
PROTECTIVE CONTROLS . . . . . . . . . . . . . . . . . . . . . 21
Compressor Protection . . . . . . . . . . . . . . . . . . . . . . . 21
COMMERCIAL DEFROST CONTROL . . . . . . . . . . . . 22
Reversing Valve Control . . . . . . . . . . . . . . . . . . . . . . 23
Compressor Control . . . . . . . . . . . . . . . . . . . . . . . . . 23
Auxiliary (Electric) Heat Control . . . . . . . . . . . . . . . . 23
Defrost. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
Defrost Thermostats . . . . . . . . . . . . . . . . . . . . . . . . . 24
Indoor Fan Off Delay . . . . . . . . . . . . . . . . . . . . . . . . . 24
Defrost Speedup Functions. . . . . . . . . . . . . . . . . . . .24
ELECTRIC HEATERS . . . . . . . . . . . . . . . . . . . . . . . . .24
Single Point Boxes and Supplementary Fuses . . . .25
Safety Devices . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .25
Completing Heater Installation . . . . . . . . . . . . . . . . .25
SMOKE DETECTORS . . . . . . . . . . . . . . . . . . . . . . . . .26
System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .26
Controller. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .26
Sensor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .26
Smoke Detector Locations. . . . . . . . . . . . . . . . . . . . .27
Completing Installation of Return-Air Smoke
Sensor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .28
FIOP Smoke Detector Wiring and Response . . . . . .28
Sensor and Controller Tests . . . . . . . . . . . . . . . . . . .29
Indicators. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .31
PREMIERLINK CONTROL . . . . . . . . . . . . . . . . . . . . .32
RTU-OPEN CONTROL SYSTEM. . . . . . . . . . . . . . . . .32
ECONOMIZER SYSTEMS . . . . . . . . . . . . . . . . . . . . . .33
EconoMi$er IV . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .37
Economi$er® X (Factory Option) . . . . . . . . . . . . . . .43
PRE-START-UP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .55
START-UP, GENERAL . . . . . . . . . . . . . . . . . . . . . . . .55
Additional Installation/Inspection . . . . . . . . . . . . . . .55
START-UP, PREMIERLINK™ . . . . . . . . . . . . . . . . . . .57
Perform System Check-Out . . . . . . . . . . . . . . . . . . . .57
START-UP, RTU-OPEN . . . . . . . . . . . . . . . . . . . . . . . .57
FASTENER TORQUE VALUES. . . . . . . . . . . . . . . . . .57
APPENDIX A — MODEL NUMBER
NOMENCLATURE. . . . . . . . . . . . . . . . . . . . . . . . . .58
APPENDIX B — PHYSICAL DATA . . . . . . . . . . . . . . .59
APPENDIX C — FAN PERFORMANCE . . . . . . . . . . .60
APPENDIX D — WIRING DIAGRAMS . . . . . . . . . . . .68
APPENDIX E — MOTORMASTER SENSOR
LOCATIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .77
START-UP CHECKLIST . . . . . . . . . . . . . . . . . . . . .CL-1
SAFETY CONSIDERATIONS
Installation and servicing of air-conditioning equipment can be
hazardous due to system pressure and electrical components.
Only trained and qualified service personnel should install, re-
pair, or service air-conditioning equipment.
Untrained personnel can perform basic maintenance functions
of cleaning coils and filters and replacing filters. All other op-
erations should be performed by trained service personnel.
When working on air-conditioning equipment, observe precau-
tions 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 extin-
guisher available for all brazing operations.
WeatherMaker
®
50KCQ 04-06 Single Package Rooftop Unit
Heat Pump/Electric Heat
with Puron
®
(R-410A) Refrigerant
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