49
Table 29 — Alarm and Alert Codes
ALARM/
ALERT
CODE
ALARM
OR
ALERT
DESCRIPTION
WHY WAS THIS
ALARM
GENERATED?
ACTION TAKEN
BY CONTROL
RESET
METHOD
PROBABLE
CAUSE
T051 Alert Circuit A, Compressor 1
Failure
Compressor feedback signal
does not match relay state
Circuit A shut down. Manual High-pressure or loss-of-
charge switch open, faulty
control relay or CPCS board,
loss of condenser air, liquid
valve closed, operation
beyond capability.
T052 Alert Circuit A, Compressor 2
Failure
Compressor feedback signal
does not match relay state
Circuit A shut down. Circuit
restarted in 1 minute. Com-
pressor A2 not used until
alarm is reset.
Manual High-pressure switch open,
faulty control relay or CPCS
board, loss of condenser air,
liquid valve closed, opera-
tion beyond capability.
T053 Alert Circuit A, Compressor 3
Failure
Compressor feedback signal
does not match relay state
Circuit A shut down. Circuit
restarted in 1 minute. Com-
pressor A3 not used until
alarm is reset.
Manual High-pressure switch open,
faulty control relay or CPCS
board, loss of condenser air,
liquid valve closed, opera-
tion beyond capability.
T054 Alert Circuit A, Compressor 4
Failure
Compressor feedback signal
does not match relay state
Circuit A shut down. Circuit
restarted in 1 minute. Com-
pressor A4 not used until
alarm is reset.
Manual High-pressure switch open,
faulty control relay or CPCS
board, loss of condenser air,
liquid valve closed, opera-
tion beyond capability.
T055 Alert Circuit B, Compressor 1
Failure
Compressor feedback signal
does not match relay state
Circuit B shut down. Manual High-pressure or loss-of-
charge switch open, faulty
control relay or CPCS board,
loss of condenser air, liquid
valve closed, operation
beyond capability.
T056 Alert Circuit B, Compressor 2
Failure
Compressor feedback signal
does not match relay state
Circuit B shut down. Circuit
restarted in 1 minute. Com-
pressor B2 not used until
alarm is reset.
Manual High-pressure switch open,
faulty control relay or CPCS
board, loss of condenser air,
liquid valve closed, opera-
tion beyond capability.
T057 Alert Circuit B, Compressor 3
Failure
Compressor feedback signal
does not match relay state
Circuit B shut down. Circuit
restarted in 1 minute. Com-
pressor B3 not used until
alarm is reset.
Manual High-pressure switch open,
faulty control relay or CPCS
board, loss of condenser air,
liquid valve closed, opera-
tion beyond capability.
A060 Alarm Cooler Leaving Fluid
Thermistor Failure (T1)
Thermistor outside range of
–40 to 245 F (–40 to 118 C)
Chiller shutdown after
pumpdown complete.
Automatic Thermistor failure, damaged
cable/wire or wiring error.
A061 Alarm Cooler Entering Fluid
Thermistor Failure (T2)
Thermistor outside range of
–40 to 245 F (–40 to 118 C)
Chiller shutdown after
pumpdown complete.
Automatic Thermistor failure, damaged
cable/wire or wiring error.
T064 Alert Circuit A Saturated Con-
densing Thermistor Failure
(T3)
Thermistor outside range of
–40 to 245 F (–40 to 118 C)
Circuit A shutdown after
pumpdown complete.
Automatic Thermistor failure, damaged
cable/wire or wiring error.
T065 Alert Circuit B Saturated Con-
densing Thermistor Failure
(T4)
Thermistor outside range of
–40 to 245 F (–40 to 118 C)
Circuit B shutdown after
pumpdown complete.
Automatic Thermistor failure, damaged
cable/wire or wiring error.
T066 Alert Circuit A Saturated Suction
Thermistor Failure (T5)
Thermistor outside range of
–40 to 245 F (–40 to 118 C)
Circuit A shutdown after
pumpdown complete.
(EXV only)
Automatic Thermistor failure, damaged
cable/wire or wiring error.
T067 Alert Circuit B Saturated Suction
Thermistor Failure (T6)
Thermistor outside range of
–40 to 245 F (–40 to 118 C)
Circuit B shutdown after
pumpdown complete.
(EXV only).
Automatic Thermistor failure, damaged
cable/wire or wiring error.
T068 Alert Compressor A1 Suction
Gas Thermistor Failure (T7)
Thermistor outside range of
–40 to 245 F (–40 to 118 C)
Circuit A shutdown after
pumpdown complete.
(EXV only).
Automatic Thermistor failure, damaged
cable/wire or wiring error.
T069 Alert Compressor B1 Suction
Gas Thermistor Failure (T8)
Thermistor outside range of
–40 to 245 F (–40 to 118 C)
Circuit B shutdown after
pumpdown complete.
(EXV only).
Automatic Thermistor failure, damaged
cable/wire or wiring error.
T073 Alert Outside Air Thermistor
Failure (T9)
Thermistor outside range of
–40 to 245 F (–40 to 118 C)
Temperature reset disabled.
Chiller runs under normal
control/set points.
Automatic Thermistor failure, damaged
cable/wire or wiring error.
T074 Alert Space Temperature
Thermistor Failure (T10)
Thermistor outside range of
–40 to 245 F (–40 to 118 C)
Temperature reset disabled.
Chiller runs under normal
control/set points.
Automatic Thermistor failure, damaged
cable/wire or wiring error.
T077 Alert Circuit A Saturated
Suction Temperature
exceeds Cooler Leaving
Fluid Temperature
Saturated suction is
greater than leaving fluid
temperature for more than
5 minutes
Circuit A shutdown after
pumpdown complete.
Automatic Faulty expansion valve or
EXV board, faulty cooler suc-
tion thermistor (T5) or leav-
ing fluid thermistor (T1).
T078 Alert Circuit B Saturated
Suction Temperature
exceeds Cooler Leaving
Fluid Temperature
Saturated suction is
greater than leaving fluid
temperature for more than
5 minutes
Circuit B shutdown after
pumpdown complete
Automatic Faulty expansion valve or
EXV board, faulty cooler suc-
tion thermistor (T6) or leav-
ing fluid thermistor (T1).
T079 Alert Lead/Lag Thermistor Failure Thermistor outside range of
–40 to 245 F (–40 to 118 C)
Lead/lag algorithm runs
using Master LWT sensor
Master is lead chiller.
Automatic Dual chiller LWT thermistor
failure, damaged cable/wire
or wiring error.
