Carrier 50FC M20 Series - Page 83

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APPENDIX D — WIRING DIAGRAMS (cont)

Fig. B — Typical 50FC-*20-30 with Electro-Mechanical W7220 Controller –

Standard SCCR (208/230-3-60)

Main Page

Table of Contents1
Safety Considerations2
Unit Arrangement and Access3
General3
Routine Maintenance3
Filters3
Supply Fan (Blower) Section4
Supply Fan (Direct-Drive)4
Staged Air Volume13
Cooling13
Condenser Coil13
Condenser Coil Maintenance and Cleaning13
Recommendation13
Evaporator Coil15
Evaporator Coil Metering Devices15
Thermostatic Expansion Valve (Txv)15
TXV Operation15
Replacing TXV15
Refrigerant System Pressure Access Ports16
Puron ® (R-410A) Refrigerant17
Refrigerant Charge17
Compressor26
Lubrication26
Replacing Compressor26
Compressor Rotation26
Filter Drier26
Condenser-Fan Adjustment26
Troubleshooting Cooling System27
Convenience Outlets28
Installing Weatherproof Cover28
Non-Powered Type28
Unit-Powered Type28
Duty Cycle29
Maintenance29
Fuse on Powered Type29
Smoke Detectors29
System29
Controller29
Smoke Detector Sensor29
Smoke Detector Locations30
FIOP Smoke Detector Wiring and Response31
Sensor and Controller Tests32
Sensor Alarm Test32
Controller Alarm Test32
Dirty Controller Test32
Dirty Controller Test . . . . . . . . . . . . . . . . . . . . . . . . . 32 APPENDIX E - LOW AMBIENT CONTROL SENSOR33
Dirty Sensor Test33
Changing the Dirt Sensor Test33
Remote Station Test33
SD-TRK4 Remote Alarm Test Procedure33
Remote Test/Reset Station Dirty Sensor Test33
Dirty Sensor Test Using an SD-TRK434
Detector Cleaning34
Indicators34
Troubleshooting35
Protective Devices35
Compressor Protection35
Relief Device36
Control Circuit, 24-V36
Electric Heaters37
Heater Installation (All Units)37
High Sccr Unit Installation  (65Ka Sccr)37
High Sccr Unit Installation  (60Ka Sccr)37
Completing Heater Installation42
Systemvu Control System43
Systemvu Interface43
Additional Systemvu Installation and Troubleshooting43
Economizer Systems44
Economi$Er245
Economi$Er IV (Field-Installed Accessory)46
Economi$Er X (Factory-Installed Option)52
Pre-Start-Up/Start-Up63
Start-Up, General64
Unit Preparation64
Additional Installation/Inspection64
Return-Air Filters64
Outdoor-Air Inlet Screens64
Compressor Mounting64
Internal Wiring64
Refrigerant Service Ports64
Compressor Rotation64
Cooling64
Heating65
Ventilation (Continuous Fan)65
Fastener Torque Values65
Start-Up, Systemvu Controls65
Appendix A - Model Number Nomenclature66
Appendix B - Physical Data68
Appendix C - Fan Performance69
Appendix D - Wiring Diagrams82
Appendix E - Low Ambient Control Sensor Location111

Carrier 50FC M20 Series - Page 83

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