Carrier 48HC*04–14

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APPENDIX IV. WIRING DIAGRAMS

C14047

Fig. 76 -- 48HC*A04--A06 YAC Control Diagram -- 208--1--60; 208/230--3--60; 460/575--3--60

48HC

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Table of Contents1
Safety Considerations1
- Routine Maintenance3
- Air Conditioning3
- Seasonal Maintenance3
Unit Arrangement and Access3
- Outside Air Hood4
- Economizer Inlet Air Screen4
Return Air Filters4
Supply Fan (Blower) Section4
- Drive Supply Fan Assembly5
- Selecting Another Speed5
- Motor Tap Programing5
- Supply Fan (Direct- -Drive)5
- Motor “Rocking” on Start-Up6
- Motor Test Volts6
- Supply Fan (Belt- - Drive)6
- Troubleshooting the ECM Motor6
- Typical Belt Drive Motor Mounting7
- Checking Blower Motor Belt Tension7
- Replacing the Belt7
- Pitch Pulley on Motor7
- Unit Installation with SAV Option8
- Staged Air Volume Control - - 2 Speed Fan with Variable Frequency Drive (Vfd)8
- Bearings8
- Identifying Factory Option8
- Aligning Blower and Motor Pulleys8
With Variable Frequency Drive (Vfd)8
- VFD Location for Size 129
- VFD Location for Size 149
Additional Variable Frequency Drive (Vfd) Installation and Troubleshooting9
Motor9
- Changing Fan Wheel Speed10
- Remove Surface Loaded Fibers13
- Routine Cleaning of Coil Surfaces13
- Condenser Coil13
Cooling13
- Unit Damage Hazard14
- Totaline Environmentally Sound Coil Cleaner Application Instructions14
- Totaline Environmentally Sound Coil Cleaner Application Equipment14
- Evaporator Coil14
- TXV Operation15
- Replacing TXV15
- TXV Valve and Sensing Bulb Location15
Thermostatic Expansion Valve (Txv)15
- Typical TXV Piping Schematic16
- Refrigerant Charge16
- Refrigerant System Pressure Access Ports16
Puronr (R- -410A) Refrigerant16
- No Charge17
- Low-Charge Cooling17
- Using Cooling Charging Charts17
- Coremax Access Port Assembly17
Cooling Charging Charts18
- Lubrication22
- Replacing Compressor22
Compressor22
- Troubleshooting Cooling System23
- Condenser- - Fan Adjustment23
- Filter Drier23
- Heating and Cooling Troubleshooting24
- Convenience Outlets: Two Types of Convenience Outlets25
- Weatherproof Cover Installation25
- Convenience Outlet Location25
Convenience Outlets25
- Controller26
- Powered Convenience Outlet Wiring26
- Maintenance26
Smoke Detectors26
- Smoke Detector Locations27
- Smoke Detector Sensor27
- Typical Return Air Smoke Detector Location28
- Return Air Sampling Tube Location28
- Return Air Sensor Operating Position28
- Return Air Smoke Detector Sensor with Economizer28
- FIOP Smoke Detector Wiring and Response29
- Additional Application Data29
- Highlight E29
- Sensor Alarm Test30
- Dirty Controller Test30
- Dirty Sensor Test30
Sensor and Controller Tests30
- SD-TRK4 Remote Alarm Test Procedure31
- Changing the Dirt Sensor Test31
- Remote Station Test31
- Remote Test/Reset Station Dirty Sensor Test31
- Detector Cleaning32
- Cleaning the Smoke Detector32
- Alarm State32
- Indicators32
- Compressor Protection33
- Controller’s Trouble LED Is on33
- Controller’s Trouble LED Is Flashing33
Protective Devices33
- Control Circuit34
- Natural Gas34
- Relief Device34
- Condenser Fan Motor Protection34
Gas Heating System34
- Flue Gas Passageways35
- Supply Pressure Switch35
- Combustion-Air Blower35
- LP Low Pressure Switch35
- Burners and Igniters36
- Main Burners36
- Removal and Replacement of Gas Train36
- Orifice Projection36
- Limit Switch37
- Cleaning and Adjustment37
- Burner Ignition37
- Check Unit Operation and Make Necessary Adjustments37
- Spark Adjustment38
- Igniter and Sensor Locations40
- Orifice Replacement40
- LED Error Code Description40
- Typical Gas Valves41
- Integrated Gas Control (IGC) Board41
- – IGC Connections42
- – Orifice Sizes42
- Propane Gas43
- Altitude Compensation43
- Natural Gas Only46
- Minimum Heating Entering Air Temperature46
- Troubleshooting Heating System46
- Heating Service Troubleshooting47
- IGC Board LED Alarm Codes48
- Premierlink Control49
- Premierlink Controller49
Rtu- -Open Control System49
Sensory/Accessory Installation49
Additional Rtu- -Open Installation and Troubleshooting50
- RTU-Open Control Module51
- Economizer Systems52
- Economizer IV Wiring52
- Standard Sensors54
- Outdoor Air Temperature (OAT) Sensor54
- Supply Air Temperature (SAT) Sensor54
- Outdoor Air Lockout Sensor54
- Outdoor Dry Bulb Changeover55
- Differential Dry Bulb Control55
- Return Air Temperature or Enthalpy Sensor Mounting Location55
- Outdoor Enthalpy Changeover56
- Differential Enthalpy Control56
- Enthalpy Changeover Setpoints56
- Damper Movement57
- Exhaust Setpoint Adjustment57
- Minimum Position Control57
- Indoor Air Quality (IAQ) Sensor Input57
- Thermostats58
- Occupancy Control58
- Demand Control Ventilation (DCV)58
- CO2 Sensor Configuration58
- Differential Enthalpy59
- Single Enthalpy59
- DCV (Demand Controlled Ventilation) and Power Exhaust59
- DCV Minimum and Maximum Position60
- Supply-Air Sensor Input60
- Additional Installation/Inspection61
- Unit Preparation61
- Personal Injury Hazard61
Pre- -Start- -Up/Start- -Up61
Start- -Up, General61
- Refrigerant Service Ports62
- Compressor Rotation62
- Compressor Mounting62
- Internal Wiring62
- Heating63
- Ventilation (Continuous Fan)63
Start- -Up, Premierlink Controls63
- Torque Values64
- Perform System Check-Out64
Start- -Up, Rtu- -Open Controls64
Fastener Torque Values64
- Model Number Nomenclature65
- Appendix I. Model Number Significance 65.66
Appendix II. Physical Data66
Phase HUMIDIMIZER71
Appendix III. Fan Performance71
- Multi-Speed/Torque Motor85
- 48HC*A06 Horizontal Unit- - Direct Drive87
- 48HC*A06 Vertical Unit- - Direct Drive87
- Pulley Adjustment88
Appendix IV Wiring Diagrams89
- HC*A04 Outdoor Circuiting126
- HC*A07 Outdoor Circuiting126
- HC*A05/06 Outdoor Circuiting126
Appendix V. Motormaster Sensor Locations126
- HC*A09 Outdoor Circuiting127
- HC*D14 Outdoor Circuiting (Circuit a and Circuit B)127
- HC*D08 Motormaster Sensor Location - Novation Coils (MCHX)128
- HC*D12 Motormaster Sensor Location - Novation Coils (MCHX)128
- Pre-Start-Up129
- Electrical129
Unit Start-Up Checklist129

Carrier 48HC*04–14 - Page 90

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