46
Table 32
Alarm and Alert Codes (cont)
ALARM/
ALERT CODE
ALARM OR
ALERT
DESCRIPTION
WHY WAS THIS
ALARM GENERATED?
ACTION TAKEN BY
CONTROL
RESET
METHOD
PROBABLE CAUSE
T120
Alert
Circuit A Low
Saturated Suction
Temperature
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.
Circuit A shut down
Manual†
Low refrigerant charge,
plugged strainer, faulty expan-
sion valve, or low water flow.
T121
Alert
Circuit B Low
Saturated Suction
Temperature
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.
Circuit B shut down
Manual†
Low refrigerant charge,
plugged strainer, faulty expan-
sion valve, or low water flow.
T122
Alert
Circuit A High
Saturated Suction
Temperature
After first 90 seconds, SST
> 55 F (12.8 C) and EXV
< 1% for 5 minutes.
Circuit A shut down
Manual
Faulty expansion valve or
transducer.
T123
Alert
Circuit B High
Saturated Suction
Temperature
After first 90 seconds, SST
> 55 F (12.8 C) and EXV
< 1% for 5 minutes.
Circuit B shut down
Manual
Faulty expansion valve or
transducer.
T124
Alert
Circuit A Low Oil
Level/Flow
Level switch input open.
Circuit A shut down
after 4th failure in
18 hours.
Manual
Low oil level, failed switch,
wiring error, failed control
module.
T125
Alert
Circuit B Low Oil
Level/Flow
Level switch input open.
Circuit B shut down
after 4th failure in
18 hours.
Manual
Low oil level, failed switch,
wiring error, failed control
module.
T126
Alert
Circuit A High Dis-
charge Pressure
SCT > 5° F
(2.8° C)
Circuit A shut down.
Automatic** Faulty transducer/high pres-
sure switch, low/restricted
condenser air/water flow†
†
T127
Alert
Circuit B High Dis-
charge Pressure
SCT > 5° F
2.8° C)
Circuit B shut down.
Automatic** Faulty transducer/high pres-
sure switch, low/restricted
condenser air/water flow†
†
A128
Alarm
Circuit A Condenser
Freeze Protection
(alarm ignored for
brine chillers)
For water cooled chillers only,
if SCT < 34 F (1.1° C)
Chiller shut down.
Turns condenser pump
On if Chiller is Off.
Automatic
Failed/bad discharge pres-
sure transducer, refrigerant
leak, configured for water-
cooled condenser.
A129
Alarm
Circuit B Condenser
Freeze Protection
(alarm ignored for
brine chillers)
For water cooled chillers only,
if SCT < 34 F (1.1° C)
Chiller shut down.
Turns condenser pump
On if Chiller is Off.
Automatic
Failed/bad discharge pres-
sure transducer, refrigerant
leak, configured for water-
cooled condenser.
T135
Alert
Circuit A Failure to
Pump Out
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).
None
Manual
Faulty transducer or EXV.
T136
Alert
Circuit B Failure to
Pump Out
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).
None
Manual
Faulty transducer or EXV
T137
Alert
Circuit A Low Dis-
charge Superheat
Superheat < 5° F (2.8° C) for
10 minutes.
Circuit A shut down
Manual
Faulty thermistor, transducer,
EXV, or Economizer TXV.
Motor cooling solenoid stuck
open.
T138
Alert
Circuit B Low Dis-
charge Superheat
Superheat < 5° F (2.8° C) for
10 minutes.
Circuit B shut down
Manual
Faulty thermistor, transducer,
EXV, or Economizer TXV.
Motor cooling solenoid stuck
open.
T140
Alert
Compressor A1 –
High Oil Filter Pres-
sure Drop
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.
None
Manual
Filter change needed to pre-
vent machine from shutting
down.
T141
Alert
Compressor A2 –
High Oil Filter Pres-
sure Drop
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.
None
Manual
Filter change needed to pre-
vent machine from shutting
down.