Carrier 48GC04 - Page 94

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APPENDIX D — WIRING DIAGRAMS

Fig. C — 48GC**04-06 Electro-Mechanical Control Wiring Diagram — 208/230-3-60 (with W7220 Control)

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Table of Contents1
Safety Considerations2
Unit Arrangement and Access3
General3
Routine Maintenance3
Filters3
Supply Fan (Blower) Section4
Supply Fan (Direct-Drive)4
Staged Air Volume11
Cooling11
Condenser Coil11
Condenser Coil Maintenance and Cleaning Recommendation11
Evaporator Coil13
Thermostatic Expansion Valve (Txv)13
TXV Operation13
Replacing TXV13
Refrigerant System Pressure Access Ports14
Puron (R-410A) Refrigerant15
Refrigerant Charge15
Cooling Charging Charts15
Compressor17
Lubrication17
Replacing Compressor17
Compressor Rotation17
Filter Drier17
Condenser-Fan Adjustment17
Troubleshooting Cooling System19
Convenience Outlets20
Installing Weatherproof Cover20
Non-Powered Type20
Unit-Powered Type20
Duty Cycle21
Maintenance21
Fuse on Powered Type21
Smoke Detectors21
System21
Controller21
Smoke Detector Sensor21
Smoke Detector Locations22
Completing Installation of Return Air Smoke23
Detector23
FIOP Smoke Detector Wiring and Response23
Sensor and Controller Tests24
Sensor Alarm Test24
Controller Alarm Test24
Dirty Controller Test24
Dirty Sensor Test24
Changing the Dirt Sensor Test25
Remote Station Test25
SD-TRK4 Remote Alarm Test Procedure25
Remote Test/Reset Station Dirty Sensor Test25
Dirty Sensor Test Using an SD-TRK425
Detector Cleaning25
Indicators26
Troubleshooting26
Protective Devices27
Compressor Protection27
Relief Device27
Control Circuit, 24-V27
Gas Heating System27
General27
Fuel Types and Pressures28
Flue Gas Passageways28
Combustion-Air Blower28
Burners and Igniters29
Burner Ignition32
Orifice Replacement32
Troubleshooting Heating System34
Systemvu Control System36
Systemvu Interface36
Additional Systemvu Installation and Troubleshooting36
Rtu Open Control System37
Sensory/Accessory Installation37
Additional RTU Open Installation and Troubleshooting38
Economizer Systems38
Economi$Er239
Economi$Er IV (Field-Installed Accessory)40
Economi$Er X (Factory Option)47
Pre-Start-Up/Start-Up60
Start-Up, General60
Unit Preparation60
Additional Installation/Inspection60
Gas Piping60
Return-Air Filters61
Outdoor-Air Inlet Screens61
Compressor Mounting61
Internal Wiring61
Refrigerant Service Ports61
Compressor Rotation61
Cooling61
Main Burner61
Heating61
Ventilation (Continuous Fan)62
Fastener Torque Values62
Start-Up, Rtu Open Controls62
Start-Up, Systemvu Controls62
Form 48GC-4-6-01SM Rev. a106
Replaces: New106

Carrier 48GC04 - Page 94

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