Carrier 48HC 04-28

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Fig. 22 — Saturated Condensing Temperature Thermistor Location — 48/50HC 17-20

Fig. 23 — Saturated Condensing Temperature Thermistor Location — 48/50HC 24-28

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SCT.A

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Main Page

Table of Contents1
Safety Considerations3
General4
Basic Control Usage4
Comfortlink Control4
Scrolling Marquee4
Accessory Navigator™ Display4
Operation5
System Pilot™ and Touch Pilot™ Devices6
CCN Tables and Display6
Force Hierarchy6
Generic Status Display Table6
Conventions Used in this Manual7
Start-Up7
Unit Preparation7
Compressor Mounting7
Refrigerant Service Ports7
Crankcase Heater(S)7
Compressor Rotation7
Power Supply7
Internal Wiring7
Evaporator Fan7
- Belt Drive Units8
- Belt Drive Units with a Vfd8
Condenser Fans and Motors8
Return-Air Filters8
Outdoor-Air Inlet Screens8
Accessory Installation8
Orifice Change (48HC)8
Gas Heat (48HC)10
Units with Energyx® System10
- Base Unit Evaporator Fan10
- Start-Up Check List10
- Erv Test Mode10
- Erv Configuration10
- Erv with Economizer Additional Configurations11
- Adjusting Erv Options11
Controls Quick Set-Up11
Control Set Point and Configuration Log11
Thermostat Control11
Space Temperature Sensor Control - Direct Wired (T-55 or T-56 or T-59)11
T-58 Communicating Room Sensor12
CCN Linkage Control12
System Pilot™ - Communication Space Sensor12
Thermidistat Control12
Space Humidistat Control12
Relative Humidity Sensor Control12
CCN Communication12
Accessories12
- Economizer12
- Power Exhaust12
- Iaq Sensor13
- Oaq Sensor13
- Fan Status13
- Filter Status13
Programming Operating Schedules13
Service Test15
Independent Outputs15
Fan Test15
Cooling Test15
Humidi-Mizer® Test15
Heating Test16
Third Party Control16
Cooling/Heating Control16
Dehumidification Control16
Remote Occupancy16
Fire Shutdown16
Alarm Output16
Economizer Damper Control16
Controls Operation16
Display Configuration16
Modes17
General Operation18
Temperature Setpoint Determination18
Occupancy Determination18
- Level 1 Priority18
- Level 2 Priority18
- Level 3 Priority19
- Indoor Fan Operation19
- Constant Volume (CV) Units (Ftyp = 1-Speed)20
Cooling Operation20
- Cooling Mode Control20
- Staging Control21
- Compressor Control21
- Outdoor Fan Control21
Heating Operation21
- Heating Mode Control22
- Supply-Air Temperature Sensor (Sat)22
- Staging Control22
- Heat Relay Control22
Economizer23
- Economizer Fault Detection and23
- Title 24 Fdd Configuration Points24
- Economizer Actuator Communication25
- Minimum Ventilation25
- Free Cooling25
- Thermostat Control26
- Space Sensor Control26
Air-Side Economizer High Limit Switches Control26
- Differential Dry Bulb Cutoff Control26
- Unoccupied Free Cooling26
- Power Exhaust (CV Units)26
- Power Exhaust (Sav Units)26
Indoor Air Quality (IAQ)27
- Iaq (Analog Input)27
- Iaq (Switch Input)27
- Outdoor Air Quality (Analog Input)28
- Fan Enable (Analog Iaq Sensor)28
- Fan Enable (Switch Input)28
Optional Humidi-Mizer Dehumidification System28
- Dehumidification Demand28
- Reheat Modes29
- Reheat Control33
- Reheat Mode Diagnostic Help33
Temperature Compensated Start33
- Setting up the System33
- Temperature Compensated Start Logic33
Carrier Comfort Network (CCN) Configuration34
Demand Limit34
Linkage35
Alarm Handling35
- Ccn Alarm Broadcast35
- Alarm Relay Output35
Energyx® Units35
- General35
- Communication36
To 25 Ton Modulating ERV39
- Occupancy40
- Modes of Operation40
- Exhaust Control41
- Wheel Stop/Jog41
- Status Points41
Troubleshooting41
Complete Unit Stoppage41
Restart Procedure42
Alarms and Alerts42
- Viewing and Clearing Unit Alarms42
- Diagnostic Alarm Codes and Possible42
Red Led49
- Green Led49
- Yellow Led49
Control Module Communication49
Communication Failures49
Cooling Troubleshooting50
Humidi-Mizer™ Troubleshooting51
Economizer Troubleshooting52
Title 24 FDD Status Points52
Heating Troubleshooting54
- Gas Heat (48Hc Units)54
- Electric Heat (50Hc Units)54
Phase Loss Protection57
- Phase Reversal Protection57
Thermistor Troubleshooting57
- Air Temperatures57
- Refrigerant Temperatures58
- Thermistor/Temperature Sensor Check58
- Sensor Trim58
Transducer Troubleshooting63
Forcing Inputs and Outputs63
Troubleshooting Units Equipped with Energyx66
- System66
- Complete Erv Stoppage66
- Check Alarms66
T418 OAU Filter Dirty66
- T418 Oau Motor Failure66
- T418 Oau Low Cfm67
- T418 Oau General Alarm67
Check Diagnostic Leds67
Communication Failures68
- Comm Failure1 - Upc to Len Fail68
- Comm Failure2 - Upc to Excb Fail68
On-Board Pressure Transducers68
Major System Components68
General68
Main Base Board (MBB)77
Economizer Control Board (ECB)79
Integrated Gas Control (IGC) Board80
48/50HC 04-14 Units - Low Voltage Terminal Board81
48/50HC 17-28 Units - Low Voltage Terminal Boards82
- (TB a and TB B)82
Communication Interface Board (CIB)82
Central Terminal Board (CTB)82
Scrolling Marquee Display83
Accessory Navigator™ Display83
Carrier Comfort Network® (CCN) Interface84
Protective Devices84
- Compressor Protection84
- Evaporator Fan Motor Protection84
- Condenser-Fan Motor Protection84
- Saturated Suction Pressure (Ssp)84
- Condensate Overflow Switch (Cofs)86
Field-Installed Accessories86
- Space Temperature Sensor (T-55)86
- Space Temperature Sensor (T-56)86
- Space Temperature Sensor (T-58)86
- Space Temperature Sensor Averaging86
- Carrier Accessory Kits86
- Two-Position Damper86
- Indoor Air Quality86
- Outdoor Air Quality86
- Enthalpy Sensors88
- Return/Supply Air Temperature Sensor88
- Space Humidistat88
- Space Humidity Sensor88
Units with Energyx System88
- Energyx Control Board (Excb)91
Universal Protocol Converter (UPC)92
- User Interface92
- Enthalpy Wheel93
- Modulating Fan93
- Modulating Outside Air Damper93
Energyx Options and Accessories93
- Economizer Damper93
- Frost Protection (Factory-Installed Only)93
- Only)93
- Wheel Motor Status (Field-Installed Only)93
- Filter Maintenance (Field-Installed Only)93
- Horizontal Transition Curb93
- Outdoor-Air Inlet Screens94
Energyx Component Lubrication94
Energyx Wheel Drive Adjustment94
Energyx Wheel Air Seal Adjustment94
Wheel and Segment Removal / Installation94
Wheel Segment Removal / Installation94
- Whole Wheel Removal / Installation95
Outside Air and Exhaust Air Hood Removal96
- Outside Air Hood Removal96
- Exhaust Air Hood Removal96
Outside Air Motorized Damper Removal97
Outside Air and Exhaust Fan Replacement97
- Outside Air Fan Removal97
- Exhaust Fan Removal99
Tables102
Appendix A - Local Display and Ccn103
Appendic B - Control Modes with Humidi-Mizer System and Economizer120
Appendic C - Variable Frequency Drive121
(Vfd)121
Appendic D - Energyx136
Performance136
Energyx® Unit Start-Up Checklist143

Carrier 48HC 04-28 - Page 62

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