Carrier 48HC 04-28 - Page 2

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• ECONOMIZER FAULT DETECTION AND
DIAGNOSTICS (FDD) CONTROL
• TITLE 24 FDD CONFIGURATION POINTS
• ECONOMIZER ACTUATOR COMMUNICATION
• MINIMUM VENTILATION
• FREE COOLING
• THERMOSTAT CONTROL
• SPACE SENSOR CONTROL
Air-Side Economizer High Limit Switches Control 26
• DIFFERENTIAL DRY BULB CUTOFF CONTROL
• UNOCCUPIED FREE COOLING
• POWER EXHAUST (CV UNITS)
• POWER EXHAUST (SAV UNITS)
Indoor Air Quality (IAQ) . . . . . . . . . . . . . . . . . . . . . . 27
• IAQ (ANALOG INPUT)
• IAQ (SWITCH INPUT)
• OUTDOOR AIR QUALITY (ANALOG INPUT)
• FAN ENABLE (ANALOG IAQ SENSOR)
• FAN ENABLE (SWITCH INPUT)
Optional Humidi-MiZer® Dehumidification System 28
• DEHUMIDIFICATION DEMAND
• REHEAT MODES
• REHEAT CONTROL
• REHEAT MODE DIAGNOSTIC HELP
Temperature Compensated Start . . . . . . . . . . . . . . . 33
• SETTING UP THE SYSTEM
• TEMPERATURE COMPENSATED START LOGIC
Carrier Comfort Network® (CCN) Configuration . . 34
Demand Limit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
Linkage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35
Alarm Handling . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35
• CCN ALARM BROADCAST
• ALARM RELAY OUTPUT
EnergyX® Units . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35
• GENERAL
• COMMUNICATION
3 to 25 Ton Modulating ERV . . . . . . . . . . . . . . . . . . . 39
• OCCUPANCY
• MODES OF OPERATION
• EXHAUST CONTROL
• WHEEL STOP/JOG
• STATUS POINTS
TROUBLESHOOTING . . . . . . . . . . . . . . . . . . . . . . . . 41
Complete Unit Stoppage . . . . . . . . . . . . . . . . . . . . . . 41
Restart Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . 42
Alarms and Alerts . . . . . . . . . . . . . . . . . . . . . . . . . . . 42
• VIEWING AND CLEARING UNIT ALARMS
• DIAGNOSTIC ALARM CODES AND POSSIBLE
CAUSES
Control Module Communication . . . . . . . . . . . . . . . 49
•RED LED
• GREEN LED
• YELLOW LED
Communication Failures . . . . . . . . . . . . . . . . . . . . . . 49
Cooling Troubleshooting . . . . . . . . . . . . . . . . . . . . . 50
Humidi-MiZer™ Troubleshooting . . . . . . . . . . . . . . . 51
Economizer Troubleshooting . . . . . . . . . . . . . . . . . . 52
Title 24 FDD Status Points . . . . . . . . . . . . . . . . . . . . 52
Heating Troubleshooting . . . . . . . . . . . . . . . . . . . . . 54
• GAS HEAT (48HC UNITS)
• ELECTRIC HEAT (50HC UNITS)
Phase Loss Protection . . . . . . . . . . . . . . . . . . . . . . . 57
• PHASE REVERSAL PROTECTION
• PHASE LOSS PROTECTION
Thermistor Troubleshooting . . . . . . . . . . . . . . . . . . 57
• AIR TEMPERATURES
• REFRIGERANT TEMPERATURES
• THERMISTOR/TEMPERATURE SENSOR CHECK
• SENSOR TRIM
Transducer Troubleshooting . . . . . . . . . . . . . . . . . 63
Forcing Inputs and Outputs . . . . . . . . . . . . . . . . . . 63
Troubleshooting Units Equipped with EnergyX®
System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 66
• COMPLETE ERV STOPPAGE
• CHECK ALARMS
T418 OAU Filter Dirty . . . . . . . . . . . . . . . . . . . . . . . . 66
• T418 OAU MOTOR FAILURE
• T418 OAU LOW CFM
• T418 OAU GENERAL ALARM
Check Diagnostic LEDs . . . . . . . . . . . . . . . . . . . . . . 67
Communication Failures . . . . . . . . . . . . . . . . . . . . . 68
• COMM FAILURE1 – UPC TO LEN FAIL
• COMM FAILURE2 – UPC TO EXCB FAIL
On-Board Pressure Transducers . . . . . . . . . . . . . . 68
MAJOR SYSTEM COMPONENTS . . . . . . . . . . . . . . 68
General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 68
Main Base Board (MBB) . . . . . . . . . . . . . . . . . . . . . 77
Economizer Control Board (ECB) . . . . . . . . . . . . . . 79
Integrated Gas Control (IGC) Board . . . . . . . . . . . . 80
48/50HC 04-14 Units — Low Voltage Terminal Board
(TB) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 81
48/50HC 17-28 Units — Low Voltage Terminal Boards
(TB A and TB B) . . . . . . . . . . . . . . . . . . . . . . . . . . 82
Communication Interface Board (CIB) . . . . . . . . . . 82
Central Terminal Board (CTB) . . . . . . . . . . . . . . . . . 82
Scrolling Marquee Display . . . . . . . . . . . . . . . . . . . 83
Accessory Navigator™ Display . . . . . . . . . . . . . . . 83
Carrier Comfort Network® (CCN) Interface . . . . . . 84
Protective Devices . . . . . . . . . . . . . . . . . . . . . . . . . . 84
• COMPRESSOR PROTECTION
• EVAPORATOR FAN MOTOR PROTECTION
• CONDENSER-FAN MOTOR PROTECTION
• SATURATED SUCTION PRESSURE (SSP)
• CONDENSATE OVERFLOW SWITCH (COFS)
Field-Installed Accessories . . . . . . . . . . . . . . . . . . . 86
• SPACE TEMPERATURE SENSOR (T-55)
• SPACE TEMPERATURE SENSOR (T-56)
• SPACE TEMPERATURE SENSOR (T-58)
• SPACE TEMPERATURE SENSOR AVERAGING
• CARRIER ACCESSORY KITS
• TWO-POSITION DAMPER
• INDOOR AIR QUALITY
• OUTDOOR AIR QUALITY
• SMOKE DETECTORS
• FILTER STATUS
• FAN STATUS
• ENTHALPY SENSORS
• RETURN/SUPPLY AIR TEMPERATURE SENSOR
• SPACE HUMIDISTAT
• SPACE HUMIDITY SENSOR
Units with EnergyX® System . . . . . . . . . . . . . . . . . 88
• ENERGYX CONTROL BOARD (EXCB)
Universal Protocol Converter (UPC) . . . . . . . . . . . 92
• USER INTERFACE
• ENTHALPY WHEEL
• MODULATING FAN
• MODULATING OUTSIDE AIR DAMPER
EnergyX Options and Accessories . . . . . . . . . . . . 93
• ECONOMIZER DAMPER (FACTORY-INSTALLED
ONLY)
• FROST PROTECTION (FACTORY-INSTALLED ONLY)
• WHEEL MOTOR STATUS (FIELD-INSTALLED ONLY)
• FILTER MAINTENANCE (FIELD-INSTALLED ONLY)
• HORIZONTAL TRANSITION CURB (FIELD-
INSTALLED ONLY)
SERVICE AND MAINTENANCE . . . . . . . . . . . . . . . . 93
EnergyX System Cleaning . . . . . . . . . . . . . . . . . . . . 93
• WHEEL AND SEGMENT CLEANING