Carrier ComfortLink 6 Series Controls, Start-Up, Operation, Service, And Troubleshooting page 46

ALARM/ ALARM OR
ALERT CODE ALERT
T120 Alert Circuit A Low
Saturated Suction
Temperature
T121 Alert Circuit B Low
Saturated Suction
Temperature
T122 Alert Circuit A High
Saturated Suction
Temperature
T123 Alert Circuit B High
Saturated Suction
Temperature
T124 Alert Circuit A Low Oil
Level/Flow
T125 Alert Circuit B Low Oil
Level/Flow
T126 Alert Circuit A High Dis-
charge Pressure
T127 Alert Circuit B High Dis-
charge Pressure
A128 Alarm Circuit A Condenser
Freeze Protection
(alarm ignored for
brine chillers)
A129 Alarm Circuit B Condenser
Freeze Protection
(alarm ignored for
brine chillers)
T135 Alert Circuit A Failure to
Pump Out
T136 Alert Circuit B Failure to
Pump Out
T137 Alert Circuit A Low Dis-
charge Superheat
T138 Alert Circuit B Low Dis-
charge Superheat
T140 Alert Compressor A1 –
High Oil Filter Pres-
sure Drop
T141 Alert Compressor A2 –
High Oil Filter Pres-
sure Drop
Table 32  Alarm and Alert Codes (cont)
WHY WAS THIS
DESCRIPTION
ALARM GENERATED?
SST reads 6° F (3.3° C) or
more below the brine freeze
point for 3 minutes or 28° F
below brine freeze point for
2 minutes.
SST reads 6° F (3.3° C) or
more below the brine freeze
point for 3 minutes or 28° F
below brine freeze point for
2 minutes.
After first 90 seconds, SST
> 55 F (12.8 C) and EXV
< 1% for 5 minutes.
After first 90 seconds, SST
> 55 F (12.8 C) and EXV
< 1% for 5 minutes.
Level switch input open.
Level switch input open.
SCT > MCT_SP + 5° F
(2.8° C)
SCT > MCT_SP + 5° F
2.8° C)
For water cooled chillers only,
if SCT < 34 F (1.1° C)
For water cooled chillers only,
if SCT < 34 F (1.1° C)
With EXV closed, SST did not
drop 10° F (5.6° C) in 6 min-
utes, or SST is not 6° F
(3.3° C) less than Brine
Freeze, or SST is not less
than 10 F (–12 C).
With EXV closed, SST did not
drop 10° F (5.6° C) in 6 min-
utes, or SST is not 6° F
(3.3° C) less than Brine
Freeze, or SST is not less
than 10 F (–12 C).
Superheat < 5° F (2.8° C) for
10 minutes.
Superheat < 5° F (2.8° C) for
10 minutes.
Oil filter pressure drop
(FD.A1) exceeds 25 psig
172 kPa) for water-cooled
units or 30 psig (207 kPa) for
air-cooled and split system
units.
Oil filter pressure drop
(FD.A2) exceeds 25 psig
(172 kPa) for water-cooled
units or 30 psig (207 kPa) for
air-cooled and split system
units.
ACTION TAKEN BY
CONTROL
Circuit A shut down
Circuit B shut down
Circuit A shut down
Circuit B shut down
Circuit A shut down
after 4th failure in
18 hours.
Circuit B shut down
after 4th failure in
18 hours.
Circuit A shut down.
Circuit B shut down.
Chiller shut down.
Turns condenser pump
On if Chiller is Off.
Chiller shut down.
Turns condenser pump
On if Chiller is Off.
None
None
Circuit A shut down
Circuit B shut down
None
None
46
RESET
PROBABLE CAUSE
METHOD
Manual† Low refrigerant charge,
plugged strainer, faulty expan-
sion valve, or low water flow.
Manual† Low refrigerant charge,
plugged strainer, faulty expan-
sion valve, or low water flow.
Manual Faulty expansion valve or
transducer.
Manual Faulty expansion valve or
transducer.
Manual Low oil level, failed switch,
wiring error, failed control
module.
Manual Low oil level, failed switch,
wiring error, failed control
module.
Automatic** Faulty transducer/high pres-
sure switch, low/restricted
condenser air/water flow†
Automatic** Faulty transducer/high pres-
sure switch, low/restricted
condenser air/water flow†
Automatic Failed/bad discharge pres-
sure transducer, refrigerant
leak, configured for water-
cooled condenser.
Automatic Failed/bad discharge pres-
sure transducer, refrigerant
leak, configured for water-
cooled condenser.
Manual Faulty transducer or EXV.
Manual Faulty transducer or EXV
Manual Faulty thermistor, transducer,
EXV, or Economizer TXV.
Motor cooling solenoid stuck
open.
Manual Faulty thermistor, transducer,
EXV, or Economizer TXV.
Motor cooling solenoid stuck
open.
Manual Filter change needed to pre-
vent machine from shutting
down.
Manual Filter change needed to pre-
vent machine from shutting
down.
†
†