Carrier 50HC Series

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APPENDIX IV. WIRING DIAGRAMS

A160135

Fig. 58 -- 50HC*A04--A06 PAC Control Diagram -- 208--1--60; 208/230--3--60; 460/575--3--60

50HC

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Table of Contents1
Safety Considerations1
Unit Arrangement and Access2
- Seasonal Maintenance3
- Air Conditioning3
- Economizer or Outside Air Damper3
- Routine Maintenance3
- Supply Fan (Direct- -Drive)4
- ECM Motor4
- Evaluating Motor Speed4
Supply Fan (Blower) Section4
- Motor “Rocking” on Start-Up5
- Troubleshooting the ECM Motor5
- Supply Fan (Belt-Drive)5
- Motor Test Volts5
- Checking Blower Motor Belt Tension6
- Replacing the Belt6
- Typical Belt Drive Motor Mounting6
- Belt6
- Unit Installation with SAV Option7
- Staged Air Volume Control - - 2 Speed Fan with Variable Frequency Drive (Vfd)7
- Changing the Fan Speed7
- Identifying Factory Option7
- Aligning Blower and Motor Pulleys7
With Variable Frequency Drive (Vfd)7
- Replacing the Motor8
- Replacing Belt Driven Motor8
Additional Variable Frequency Drive (Vfd) Installation and Troubleshooting8
Motor8
- Changing Fan Wheel Speed9
- Remote VFD Keypad Reference10
- SRT Unit VFD Parameters11
- Condenser Coil12
- Condenser Coil Maintenance and Cleaning Recommendation12
- Remove Surface Loaded Fibers12
Cooling12
- Cleaning the Evaporator Coil13
- Totaline Environmentally Sound Coil Cleaner Application Equipment13
- Totaline Environmentally Sound Coil Cleaner Application Instructions13
- Evaporator Coil13
- Replacing TXV14
- Refrigerant System Pressure Access Ports14
- TXV Valve and Sensing Bulb Location14
Thermostatic Expansion Valve (Txv)14
- Puronr (R- - 410A) Refrigerant15
- Refrigerant Charge15
- No Charge15
- Low-Charge Cooling15
- Coremax Access Port Assembly16
- Seat16
- Core16
Cooling Charging Charts17
- Replacing Compressor21
- Compressor Rotation21
- Lubrication21
Compressor21
- Filter Drier22
- Condenser-Fan Adjustment22
- Troubleshooting Cooling System22
- Cooling Troubleshooting23
- Convenience Outlet Location24
- Weatherproof Cover Installation24
Convenience Outlets24
- Controller Assembly25
- Powered Convenience Outlet Wiring25
Smoke Detectors25
- Smoke Detector Sensor26
- Smoke Detector Locations26
- Supply Air26
- Typical Supply Air Smoke Detector Sensor Location26
- Completing Installation of Return Air Smoke Detector27
- Return Air Smoke Detector Sensor with Economizer27
- Return Air Sensor Operating Position27
- FIOP Smoke Detector Wiring and Response28
- Typical Smoke Detector System Wiring28
- Dirty Controller Test29
- Controller Alarm Test29
- Controller Alarm Test Procedure29
- Sensor Alarm Test29
Sensor and Controller Tests29
- Changing the Dirt Sensor Test30
- Remote Test/Reset Station Dirty Sensor Test30
- Remote Station Test30
- Dirty Sensor Test Procedure30
- Detector Cleaning31
- Alarm State31
- Indicators31
- Normal State31
- Controller’s Trouble LED Is Flashing32
- Sensor’s Trouble LED Is on32
- Controller’s Trouble LED Is on32
Protective Devices32
- Relief Device33
- Detector Indicators33
Premierlink Control33
Rtu- -Open Control System33
Sensory/Accessory Installation34
Additional Rtu- -Open Installation and Troubleshooting34
- RTU-Open Control Module35
- Economizer Systems36
- Outdoor Air Temperature (OAT) Sensor38
- Supply Air Temperature (SAT) Sensor38
- Outdoor Air Lockout Sensor38
- Differential Dry Bulb Control39
- Outdoor Dry Bulb Changeover39
- Outdoor Enthalpy Changeover40
- Differential Enthalpy Control40
- Enthalpy Changeover Setpoints40
- Damper Movement41
- Minimum Position Control41
- Indoor Air Quality (IAQ) Sensor Input41
- Exhaust Setpoint Adjustment41
- Thermostats42
- Occupancy Control42
- Demand Control Ventilation (DCV)42
- CO2 Sensor Configuration42
- DCV (Demand Controlled Ventilation) and Power Exhaust43
- To Check DCV and Power Exhaust43
- Single Enthalpy43
- Differential Enthalpy43
- Air Sensor Input44
Pre- -Start- -Up/Start- -Up44
- Unit Preparation45
- Additional Installation/Inspection45
- Compressor Mounting45
Start- -Up, General45
Start- -Up, Premierlink Controls46
Start- -Up, Rtu- -Open Controls46
Fastener Torque Values47
- Model Number Nomenclature48
- Appendix I. Model Number Significance 48.49
Appendix II. Physical Data49
Appendix III. Fan Performance52
Speed/Torque Motor67
Appendix IV Wiring Diagrams71
- 50HC*A05/06 Outdoor Circuiting121
- 50HC*A07 Outdoor Circuiting121
- 50HC*A04 Outdoor Circuiting121
Appendix V. Motormaster Sensor Locations121
- 50HC*A09 Outdoor Circuiting122
- 50HC*D14 Outdoor Circuiting122
- 50HC*D08 Motormaster Sensor Location - Novation Coils (MCHX)123
- 50HC*D12 Motormaster Sensor Location - Novation Coils (MCHX)123
- Preliminary Information124
- Pre-Start-Up124
Unit Start-Up Checklist124

Carrier 50HC Series - Page 72

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