75
Table 33 – Humidi--MiZer
Troubleshooting
PROBLEM
CAUSE
SOLUTION
Reheat1 (Subcooling) Mode Will Not
Activate
No Dehumidification Demand.
See
“No Dehumidification Demand”
below.
Outdoor temperature too low.
Compare outdoor temperature to LTLO setting. Normal operation.
General Cooling Mode problem.
See Cooling Service Troubleshooting.
Faulty Reheat Control Board (RCB) relay operation. See
“Reheat Control Board (RCB) Relay Operation”
below.
Cooling Liquid Valve open.
See
“Cooling Liquid Valves Operation”
below.
Reheat2 (Hot Gas Reheat) Mode Will Not
Activate
No Dehumidification Demand.
See
“No Dehumidification Demand”
below.
Outdoor temperature too low.
Compare outdoor temperature to LTLO setting. Subcooling (Re-
heat1) operation.
General Cooling Mode problem.
See Cooling Service Troubleshooting.
Faulty Reheat Control Board (RCB) relay operation. See
“Reheat Control Board (RCB) Relay Operation”
below.
Cooling Liquid Valve open.
See
“Cooling Liquid Valves”
below.
Reheat Discharge Valve closed.
See
“Reheat Discharge Valve (RDV) ”
below.
No Dehumidification Demand
Relative humidity set--point is too high -- Hu-
midistat.
Check/decrease setting on accessory Humidistat.
No humidity signal.
Check wiring at RCB: Pin J1A--1
Check Humidistat or Humidity Sensor
Check Low Temperature Lockout (LTLO) switch status and
wiring.
Reheat Control Board (RCB)
Relay Operation
No 24V signal to input terminals.
Check wiring at RCB: Pin J1A--1
Check Low Temperature Lockout (LTLO) switch status and
wiring.
Check wiring and voltage at RCB: Pin J2--1
Check Control Terminal Board (CTB): Terminal R
Check TRAN primary, secondary circuit breaker
Check TRAN2 primary, secondary circuit breaker (when
used).
Check wiring.
24V signal to input terminal J1A--2.
Check for Thermostat Heating Demand (W1).
If YES, normal operation.
if NO, check wiring.
No power to output terminals.
Replace faulty Reheat Control Board (RCB).
Relay outputs do not change state.
Replace faulty Reheat Control Board (RCB).
Cooling Liquid Valves Operation
CSV (Sizes 04--12) (Type 1):
Open in Cool (De--energized)
Close in Reheat1 and Reheat2 (Energized)
CLV (Size 14) (Type 2):
Open in Cool (De--energized)
Close in Reheat1 and Reheat2 (Energized)
LDV: 3--way (Size 16) (Type 3):
NO: Open in Cool (De--energized)
Close in Reheat 1 and Reheat 2
(Energized)
NO: Close in Cool (De--energized) Open
in Reheat 1 and Reheat 2 (Energized)
Reheat1 or Reheat2 will not activate.
Check RCB Pin J2--2 for 24V
Check RCB Pin J2--2 for 0V
Check RCB Pin J2--2 for 24V
See
“Reheat Control Board (RCB) Relay Operation”
.
Solenoid Coil Burnout (CLV, LDV)
Check continuous voltage is less than 10%.
Check under--voltage is less than 10%
Check for missing coil assembly parts.
Check for damaged valve enclosing tube.
Stuck valve.
Replace CLV valve. Replace Filter Drier.
Reheat Discharge Valve Operation
Reheat2 will not activate
DSV, DSV1, RDV, RDV1:
Check for RCB Pin J2--5 for 24V.
DSV2, RDV2: Check for RCB Pin J2--5 for 24V.
See
“Reheat Control Board (RCB) Relay Operation”
Supply (Indoor) Fan Motor Not Running in
Reheat2 Mode
Reheat Control board:
No Input on RCB pin J1B--4.
RCB Relay failure at output RCB pin JB--2
See
“Reheat Control Board (RCB) Relay Operation”
.
48TC
Summary of Contents for 48TC 04 Series
Page 27: ...27 COOLING CHARGING CHARTS cont C14064 Fig 33 Cooling Charging Charts 12 5 Ton 48TC...
Page 29: ...29 COOLING CHARGING CHARTS cont C13218 Fig 35 Charging Chart 48TC Size D16 48TC...
Page 40: ...40 C14052 Fig 51 Typical Smoke Detector System Wiring 48TC...
Page 122: ...122 APPENDIX III WIRING DIAGRAMS C12413 Fig 103 48TC A04 A07 Power Diagram 208 230 1 60 48TC...
Page 124: ...124 APPENDIX III WIRING DIAGRAM LIST C12415 Fig 105 48TC A04 A07 Power Diagram 575 3 60 48TC...
Page 126: ...126 APPENDIX III WIRING DIAGRAM LIST C13246 Fig 107 48TC A08 A12 Power Diagram 575 3 60 48TC...
Page 128: ...128 APPENDIX III WIRING DIAGRAM LIST C13247 Fig 109 48TC D08 D12 Power Diagram 575 3 60 48TC...
Page 130: ...130 APPENDIX III WIRING DIAGRAM LIST C13249 Fig 111 48TC D14 Power Diagram 575 3 60 48TC...
Page 139: ...139 APPENDIX III WIRING DIAGRAMS C12423 Fig 120 48TC D16 Power Diagram 575 3 60 48TC...
Page 143: ...143 APPENDIX III WIRING DIAGRAM LIST C13485 Fig 124 48TC 16 PremierLink Control Diagram 48TC...
Page 145: ...145 APPENDIX III WIRING DIAGRAM LIST C13487 Fig 126 48TC 16 RTU Open Control Diagram 48TC...
Page 146: ...146 APPENDIX III WIRING DIAGRAM LIST C14124 Fig 127 48TC D08 14 E08 14 W7220 2 Speed IFM 48TC...
