Carrier 50HCQA Installation Manual Page 41
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- Table of contents
- TROUBLESHOOTING
- BOOKMARKS
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41
Humidi--MiZert Troubleshooting
Use the unit Scrolling Marquee display or a CCN device to view
the cooling status display and the cooling diagnostic display (see
Appendix A) for information on the cooling operation and the
related Humidi-MiZer operation. Check the current alarms and
alarm history for any cooling alarm codes and correct any causes.
(See Table 9.) Verify any unique control configurations per
installed site requirements or accessories.
If alarm conditions are corrected and cleared, operation of the
compressors, fans, and Humidi-MiZer valves may be verified by
using the Service Test mode (see Table 4.) In addition to general
cooling service analysis (see Table 11), see Table 12 for general
Humidi-MiZer service analysis.
NOTE: Wiring, operation, and charge are different on a
Humidi-MiZer unit compared to a standard unit.
Table 12 – Humidi-MiZer Service Analysis
PROBLEM CAUSE REMEDY
Subcooling Reheat Mode
Will Not Activate.
General cooling mode problem. See Cooling Service Analysis (Table 11).
No dehumidification demand. See No Dehumidification Demand, below.
CRC relay operation. See CRC Relay Operatio n, below.
Ci rcuit RLV, CLV or LDV valve proble m. Se e CLV, RLV or LD V Valve Operation, below.
Hot Gas Reheat Mode
Will Not Activate.
General cooling mode problem. See Cooling Service Analysis (Table 11).
No dehumidification demand. See No Dehumidification Demand, below.
CRC relay operation. See CRC Relay Operatio n, below.
Ci rcuit RLV, CLV or LDV valve proble m. Se e CLV, RLV or LD V Valve Operation, below.
Circuit RDV valve is not open. SeeRDVValveOperation,below.
Outdoor temperature t oo low.
Check Reheat2 Circuit Limit Temperatures
(ConfigurationHMZRRA.LO and RB.LO)
using ComfortLink Scrolling Marquee.
No Dehumidification Demand.
Relative humidity setpoint is
too low — Humidistat
Check/reduce setting on accessory humidistat.
Relative humidity setpoint is
too low — RH sensor.
Check Space RH Setpoints (SetpointsRH.SP and RH.UN) and
occupancy using ComfortLink Scrolling Marquee.
Software configuration error
for accessory humidistat.
Check Space Humidity Switch (Configuration
UNITRH.SW) using ComfortLink Scrolling Marquee.
Software configuration error
for accessory humidity sensor.
Check RH Sensor on OAQ Input (Configuration
UNITRH.S) using ComfortLink Scrolling Marquee.
No humidity signal. Check wiring. Check humidistat or humidity sensor.
CRC Relay Operation.
No 24V signal t o input terminals.
Check using CoolReheat1 Valve Test (Service TestHMZRCRC)
using ComfortLink Scrolling Marquee.
Check MBB relay output.
Check wiring.
Check transformer and circuit breaker.
No power to output terminals. Check wiring.
Relay outputs do not change state. Replace faulty relay.
RLV, CLV or LDV Valve Operation
No 24V signal t o input terminals.
Check using CoolReheat1 Valve Test (Service TestHMZRCRC)
using ComfortLink Scrolling Marquee.
Check CRC Rela y Operation.
Check Wiring.
Check transformer and circuit beaker or fuses.
Solenoid coil burnout.
Check continuous over-voltage is less than 10%.
Check under-voltage is less t han 15%.
Check for missing coil assembly parts.
Check for damaged valve enclosing tube.
Stuck valve. Replace valve. Replace filter drier.
RDV Valve Operation.
(NOTE: Normally Clo s ed
When De-energized)
No 24V signal t o input terminals.
Check using CoolReheat1 Valve Test (Service TestHMZRRH V.A or
RHV.B) using ComfortLink Scrolling Marquee.
Check MBB relay output.
Check wiring.
Check transformer and circuit breaker or fuses.
Solenoid coil burnout.
Check continuous over-voltage is less than 10%.
Check under-voltage is less t han 15%.
Check for missing coil assembly parts.
Check for damaged valve enclosing tube.
Stuck valve. Replace valve. Replace filter drier.
Low Latent Capacity in Subcooling or
Hot Gas Reheat Modes.
CLV valve open or leaking. SeeCLVValveOperation,above.
Low Sensible Capacity in Normal Cool
or Subcooling Reheat Modes.
RDV valve open or leaking. SeeRDVValveOperation,above.
Low Suction Pressure and High
Superheat During Normal Cool Mode.
General cooling mode problem. See Cooling Service Analysis (Table 11).
RDV valve open or leaking. SeeRDVValveOperation,above.
Low Suction Pressure
and High Discharge Pressure.
General cooling mode problem. See Cooling Service Analysis (Table 11).
BothRLVandCLVvalvesclosed. Se e RLV and CLV Valve Operation, a bo ve.
RDV Valve Cycling On/Off.
Hot Gas Reheat mode low suction pressure limit.
Normal Operation During Mixed Circuit Subcooling and Hot Gas Reheat
Modes at Lower Outdoor Temperatures.
CircuitBWillNotOperateWith
Circuit A Off.
Normal operation. Motormaster outdoor fan con-
trol requires operation of circuit A.
None
LEGEND
CRC --- Cooling/Reheat Control
CLV --- Cooling Liquid Valve
RLV --- R e h e a t L i q u id V a l v e
RH --- Relative Humidity
RDV --- Reheat Discharge Valve
ComfortLINK v2.X
- 48/50HC 04---28 1
- Single Package Rooftop Units 1
- SAFETY CONSIDERATIONS 2
- BASIC CONTROL USAGE 3
- Accessory Navigator Display 4
- Operation 4
- CCN Tables and Display 4
- Force Hierarchy 5
- Generic Status Display Table 5
- START-UP 6
- Condenser Fans and Motors 7
- Return--Air Filters 7
- Outdoor--Air Inlet Screens 7
- Accessory Installation 7
- Orifice Change (48HC) 7
- Gas Heat (48HC) 8
- Economizer 9
- SERVICE TEST 12
- THIRD PARTY CONTROL 13
- CONTROLS OPERATION 14
- General Operation 15
- Occupancy Determination 16
- Cooling Mode Control 18
- Staging Control 18
- Compressor Control 19
- Outdoor Fan Control 19
- Heating Mode Control 19
- Heat Relay Control 20
- Economizer Position % 21
- Fan Speed % 21
- Free Cooling 22
- Thermostat Control 22
- Space Sensor Control 22
- Unoccupied Free Cooling 22
- Power Exhaust (CV units) 22
- Power Exhaust (SAVt units) 23
- IAQ (Analog Input) 23
- IAQ (Switch Input) 24
- Fan Enable (Switch Input) 24
- Dehumidification Demand 25
- Reheat Modes 25
- Temperature Compensated Start 29
- Carrier Comfort Network (CCN) 30
- Configuration 30
- Demand Limit 30
- TROUBLESHOOTING 31
- Complete Unit Stoppage 32
- Restart Procedure 32
- Alarms and Alerts 32
- MBB --- Main Base Board 37
- Green LED 39
- Yellow LED 39
- Cooling Troubleshooting 40
- Economizer Troubleshooting 42
- Heating Troubleshooting 43
- IDM – Induced-Draft Motor 44
- “AUTO” position 44
- Phase Loss Protection 46
- Thermistor Troubleshooting 46
- CIRCUIT “B” 49
- CIRCUIT “A” 49
- Transducer Troubleshooting 50
- Forcing Inputs and Outputs 50
- MAJOR SYSTEM COMPONENTS 53
- RED LED - STATUS GREEN LED 62
- LEN (LOCAL EQUIPMENT NETWORK) 62
- YELLOW LED 62
- CCN (CARRIER COMFORT NETWORK) 62
- INSTANCE JUMPER (SET TO 1) 62
- RED LED-STATUS 66
- 48/50HC 04--14 Units — 67
- 48/50HC 17--28 Units — 68
- Central Terminal Board (CTB) 68
- Scrolling Marquee Display 70
- Accessory Navigatort Display 70
- Interface 70
- Protective Devices 72
- Field-Installed Accessories 72
- MODE — RUN STATUS 75
- MODE — RUN STATUS (cont) 76
- MODE — SERVICE TEST 78
- MODE — TEMPERATURES 78
- MODE — PRESSURES 78
- MODE — INPUTS 79
- MODE — OUTPUTS 79
- MODE — SET POINTS 79
- MODE — CONFIGURATION 80
- MODE — TIME CLOCK 85
- CCN ONLY TABLES 85
- MODE — OPERATING MODES 86
- MODE — OPERATING MODES (cont) 87
- MODE — ALARMS 89
- VFD Diagnostics 95
- Table 32 — FAULT CODES (cont) 96
- Table 33 – ALARM CODES 97
- INDICATE UNIT SETTINGS BELOW 98
- MODE — CONFIGURATION (cont) 100
- ComfortLINK v2.X 100
- ELECTRICAL 103
- TEMPERATURES 103
- PRESSURES 103
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