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53
Alarms and Alerts —
These are warnings of abnormal
or fault conditions, and may cause either one circuit or the
whole unit to shut down. They are assigned code numbers as
described in Table 29.
Automatic alarms will reset without operator intervention if
the condition corrects itself. The following method must be
used to reset manual alarms:
Before resetting any alarm, first determine the cause of the
alarm and correct it. Enter the Alarms mode indicated by the
LED on the side of the Scrolling Marquee Display. Press
and until the sub-menu item RCRN “RESET
ALL CURRENT ALARMS” is displayed. Press .
The control will prompt the user for a password, by displaying
PASS and WORD. Press to display the default pass-
word, 1111. Press for each character. If the password
has been changed, use the arrow keys to change each individu-
al character. Toggle the display to “YES” and press .
The alarms will be reset.
Table 29 — Alarm and Alert Codes
ENTER
ENTER
ENTER
ENTER
ENTER
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
Compressor A1 shut
down.
Manual High-pressure switch open,
faulty auxiliary contacts, loss
of condenser air, liquid
valve closed, filter drier
plugged, non-condensables,
operation beyond capability.
T052 Alert Circuit A, Compressor 2
Failure
Compressor feedback signal
does not match relay state
Compressor A2 shut
down.
Manual High-pressure switch open,
faulty auxiliary contacts, loss
of condenser air, liquid
valve closed, filter drier
plugged, non-condensables,
operation beyond capability.
T055 Alert Circuit B, Compressor 1
Failure
Compressor feedback signal
does not match relay state
Compressor B1 shut
down.
Manual High-pressure switch open,
faulty auxiliary contacts, loss
of condenser air, liquid
valve closed, filter drier
plugged, non-condensables,
operation beyond capability.
T056 Alert Circuit B, Compressor 2
Failure
Compressor feedback signal
does not match relay state
Compressor B2 shut
down.
Manual High-pressure switch open,
faulty auxiliary contacts, loss
of condenser air, liquid
valve closed, filter drier
plugged, non-condensables,
operation beyond capability.
A060 Alarm Cooler Leaving Fluid
Thermistor Failure (T1)
Thermistor outside range of
–40 to 245 F (–40 to 118 C)
Chiller shutdown
immediately
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
immediately
Automatic Thermistor failure, damaged
cable/wire or wiring error.
T068 None Circuit A Return Gas Thermistor Failure If return gas sensors are
enabled (RG.EN) and
thermistor is outside range of
–40 to 245 F (–40 to 118 C)
None Automatic Thermistor failure, damaged
cable/wire or wiring error.
T069 None Circuit B Return Gas Thermistor Failure If return gas sensors are
enabled (RG.EN) and
thermistor is outside range of
–40 to 245 F –40 to 118 C)
None 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. When capacity
reaches 0, cooler/pump
heaters are energized.
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
Faulty expansion valve,
suction pressure transducer
or leaving fluid thermistor
(T1).
Circuit A shutdown after
pumpdown complete.
Automatic Faulty expansion valve or
suction pressure transducer
(T5) or leaving fluid
thermistor (T1).
T078 Alert Circuit B Saturated
Suction Temperature
exceeds Cooler Leaving
Fluid Temperature
Faulty expansion valve,
suction pressure transducer
or leaving fluid thermistor
(T1).
Circuit B shutdown after
pumpdown complete
Automatic Faulty expansion valve or
suction pressure transducer
(T6) or leaving fluid
thermistor (T1).
T079 Alert Lead/Lag LWT
Thermistor Failure
Thermistor outside range of
–40 to 245 F (–40 to 118 C)
Chiller runs as a stand
alone machine
Automatic Dual LWT thermistor failure,
damaged cable/wire or
wiring error.
T090 Alert Circuit A Discharge
Pressure Transducer Failure
Voltage ratio more than
99.9% or less than .5%.
Circuit A shut down Automatic Transducer failure, poor
connection to MBB, or wiring
damage/error.
T091 Alert Circuit B Discharge
Pressure Transducer Failure
Voltage ratio more than
99.9% or less than .5%.
Circuit B shut down Automatic Transducer failure, poor
connection to MBB, or wiring
damage/error.
T092 Alert Circuit A Suction
Pressure Transducer Failure
Voltage ratio more than
99.9% or less than .5%.
Circuit A shut down Automatic Transducer failure, poor
connection to MBB, or wiring
damage/error.