17
Table 2 – Humidi-MiZer Troubleshooting
PROBLEM
CAUSE
REMEDY
Subcooling Reheat Mode
Will Not Activate.
General cooling mode problem.
See Cooling Service Analysis (Table 3).
No dehumidification demand.
See No Dehumidification Demand, below.
CRC relay operation.
See CRC Relay Operation, below.
Circuit RLV, CLV or LDV valve problem.
See CLV, RLV or LDV Valve Operation, below.
Hot Gas Reheat Mode
Will Not Activate.
General cooling mode problem.
See Cooling Service Analysis (Table 3).
No dehumidification demand.
See No Dehumidification Demand, below.
CRC relay operation.
See CRC Relay Operation, below.
Circuit RLV, CLV or LDV valve problem.
See CLV, RLV or LDV Valve Operation, below.
Circuit RDV valve is not open.
See RDV Valve Operation, below.
Outdoor temperature too low.
Check Reheat2 Circuit Limit Temperatures
(Configuration
HMZR
RA.LO and RB.LO)
using
Comfort
Link 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 (Setpoints
RH.SP and RH.UN) and
occupancy using
Comfort
Link Scrolling Marquee.
Software configuration error
for accessory humidistat.
Check Space Humidity Switch (Configuration
UNIT
RH.SW) using
Comfort
Link Scrolling Marquee.
Software configuration error
for accessory humidity sensor.
Check RH Sensor on OAQ Input (Configuration
UNIT
RH.S) using
Comfort
Link Scrolling Marquee.
No humidity signal.
Check wiring. Check humidistat or humidity sensor.
CRC Relay Operation.
No 24V signal to input terminals.
Check using Cool
Reheat1 Valve Test (Service Test
HMZR
CRC)
using
Comfort
Link 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 to input terminals.
Check using Cool
Reheat1 Valve Test (Service Test
HMZR
CRC)
using
Comfort
Link Scrolling Marquee.
Check CRC Relay 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 than 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 Closed
When De-energized)
No 24V signal to input terminals.
Check using Cool
Reheat1 Valve Test (Service Test
HMZR
RHV.A or
RHV.B) using
Comfort
Link 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 than 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.
See CLV Valve Operation, above.
Low Sensible Capacity in Normal Cool
or Subcooling Reheat Modes.
RDV valve open or leaking.
See RDV Valve Operation, above.
Low Suction Pressure and High
Superheat During Normal Cool Mode.
General cooling mode problem.
See Cooling Service Analysis (Table 3).
RDV valve open or leaking.
See RDV Valve Operation, above.
Low Suction Pressure
and High Discharge Pressure.
General cooling mode problem.
See Cooling Service Analysis (Table 3).
Both RLV and CLV valves closed.
See RLV and CLV Valve Operation, above.
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.
Circuit B Will Not Operate With
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
--- Reheat Liquid Valve
. .
RH
--- Relative Humidity
. . .
RDV
--- Reheat Discharge Valve
.
48H
C
Содержание 48HC D17 Series
Страница 76: ...76 APPENDIX IV WIRING DIAGRAMS C12615 Fig 76 48HC D17 D28 Control Diagram 208 230 3060 460 575 3 60 48HC...
Страница 77: ...77 APPENDIX IV WIRING DIAGRAMS C12616 Fig 77 48HC D17 D28 Power Diagram 208 230 3 60 48HC...
Страница 78: ...78 APPENDIX IV WIRING DIAGRAMS C12617 Fig 78 48HC D17 D28 Power Diagram 460 3 60 48HC...
Страница 79: ...79 APPENDIX IV WIRING DIAGRAMS C12618 Fig 79 48HC D17 D28 Power Diagram 575 3 60 48HC...
Страница 80: ...80 APPENDIX IV WIRING DIAGRAMS C14061 Fig 80 48HC D17 D28 Control Diagram with Humidi MiZer 48HC...
Страница 81: ...81 APPENDIX IV WIRING DIAGRAMS C12620 Fig 81 48HC D17 D28 Power Diagram 208 230 3 60 with Humidi MiZer 48HC...
Страница 82: ...82 APPENDIX IV WIRING DIAGRAMS C12621 Fig 82 48HC D17 D28 Power Diagram 460 3 60 with Humidi MiZer 48HC...
Страница 83: ...83 APPENDIX IV WIRING DIAGRAMS C12622 Fig 83 48HC D17 D28 Power Diagram 575 3 60 with Humidi MiZer 48HC...
Страница 85: ...85 APPENDIX IV WIRING DIAGRAMS C13766 Fig 85 PremierLinkt System Control Wiring Diagram with Humidi MiZer 48HC...
Страница 86: ...86 APPENDIX IV WIRING DIAGRAMS C13767 Fig 86 RTU OPEN Wiring Diagram 48HC...
Страница 87: ...87 APPENDIX IV WIRING DIAGRAMS C13768 Fig 87 RTU OPEN Wiring Diagram with Humidi MiZer 48HC...
