Table 42 — Alarm and Alert Codes

ALARM/

ALARM

 

WHY WAS THIS

ACTION TAKEN

RESET

PROBABLE

ALERT

OR

DESCRIPTION

ALARM

BY CONTROL

METHOD

CAUSE

CODE

ALERT

 

GENERATED?

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

High-pressure switch open,

T051

 

Circuit A, Compressor 1

Compressor feedback signal

Compressor A1 shut

 

faulty CSB, loss of condenser

Alert

Manual

air, filter drier plugged, non-

Failure

does not match relay state

down.

 

 

 

condensables, operation

 

 

 

 

 

 

 

 

 

 

 

 

beyond capability.

 

 

 

 

 

 

 

 

 

 

Respective current sensor

 

 

 

A051

Alarm

Circuit A, Compressor 1

board (CSB) feedback signal

Unit shut down

Manual

Welded compressor contac-

Failure

is ON when the compressor

tor, CSB wiring error.

 

 

 

 

 

 

 

should be off

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

High-pressure switch open,

T052

 

Circuit A, Compressor 2

Compressor feedback signal

Compressor A2 shut

 

faulty CSB, loss of condenser

Alert

Manual

air, filter drier plugged, non-

Failure

does not match relay state

down.

 

 

 

condensables, operation

 

 

 

 

 

 

 

 

 

 

 

 

beyond capability.

 

 

 

 

 

 

 

 

 

 

Respective current sensor

 

 

 

A052

Alarm

Circuit A, Compressor 2

board (CSB) feedback signal

Unit shut down

Manual

Welded compressor contac-

Failure

is ON when the compressor

tor, CSB wiring error.

 

 

 

 

 

 

 

should be off

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

High-pressure switch open,

T055

 

Circuit B, Compressor 1

Compressor feedback signal

Compressor B1 shut

 

faulty CSB, loss of condenser

Alert

Manual

air, filter drier plugged, non-

Failure

does not match relay state

down.

 

 

 

condensables, operation

 

 

 

 

 

 

 

 

 

 

 

 

beyond capability.

 

 

 

 

 

 

 

 

 

 

Respective current sensor

 

 

 

A055

Alarm

Circuit B, Compressor 1

board (CSB) feedback signal

Unit shut down

Manual

Welded compressor contac-

Failure

is ON when the compressor

tor, CSB wiring error.

 

 

 

 

 

 

 

should be off

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

High-pressure switch open,

T056

 

Circuit B, Compressor 2

Compressor feedback signal

Compressor B2 shut

 

faulty CSB, loss of condenser

Alert

Manual

air, filter drier plugged, non-

Failure

does not match relay state

down.

 

 

 

condensables, operation

 

 

 

 

 

 

 

 

 

 

 

 

beyond capability.

 

 

 

 

 

 

 

 

 

 

Respective current sensor

 

 

 

A056

Alarm

Circuit B, Compressor 2

board (CSB) feedback signal

Unit shut down

Manual

Welded compressor contac-

Failure

is ON when the compressor

tor, CSB wiring error.

 

 

 

 

 

 

 

should be off

 

 

 

 

 

 

 

 

 

 

A060

Alarm

Cooler Leaving Fluid

Thermistor outside range of

Chiller shut down

Automatic

Thermistor failure, damaged

 

 

Thermistor Failure

–40 to 245 F (–40 to 118 C)

immediately

 

cable/wire or wiring error.

A061

Alarm

Cooler Entering Fluid

Thermistor outside range of

Chiller shut down

Automatic

Thermistor failure, damaged

 

 

Thermistor Failure

–40 to 245 F (–40 to 118 C)

immediately

 

cable/wire or wiring error.

 

 

 

If return gas sensors are

 

 

 

T068

None

Circuit A Return Gas Thermistor Failure

enabled (RG.EN) and

Circuit A shut down

Automatic

Thermistor failure, damaged

 

 

 

thermistor is outside range of

 

 

cable/wire or wiring error.

 

 

 

–40 to 245 F (–40 to 118 C)

 

 

 

 

 

 

If return gas sensors are

 

 

 

T069

None

Circuit B Return Gas Thermistor Failure

enabled (RG.EN) and

Circuit B shut down

Automatic

Thermistor failure, damaged

 

 

 

thermistor is outside range of

 

 

cable/wire or wiring error.

 

 

 

–40 to 245 F –40 to 118 C)

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Temperature reset

 

 

 

 

 

 

disabled. Chiller runs

 

 

T073

Alert

Outside Air Thermistor

Thermistor outside range of

under normal control/set

Automatic

Thermistor failure, damaged

 

 

Failure

–40 to 245 F (–40 to 118 C)

points. When capacity

 

cable/wire or wiring error.

 

 

 

 

reaches 0, cooler/pump

 

 

 

 

 

 

heaters are energized.

 

 

 

 

 

 

Temperature reset

 

 

T074

Alert

Space Temperature/Dual Chiller

Thermistor outside range of

disabled. Chiller runs

Automatic

Thermistor failure, damaged

 

 

Thermistor Failure

–40 to 245 F (–40 to 118 C)

under normal control/set

 

cable/wire or wiring error.

 

 

 

 

points.

 

 

 

 

Circuit A Saturated

Faulty expansion valve,

 

 

Faulty expansion valve or

T077

 

Suction Temperature

Circuit A shutdown after

 

suction pressure transducer

Alert

suction pressure transducer

Automatic

 

 

exceeds Cooler Leaving

or leaving fluid thermistor.

pumpdown complete.

 

or leaving fluid

 

 

Fluid Temperature

 

 

thermistor.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Circuit B Saturated

Faulty expansion valve,

 

 

Faulty expansion valve or

T078

 

Suction Temperature

Circuit B shutdown after

 

suction pressure transducer

Alert

suction pressure transducer

Automatic

 

 

exceeds Cooler Leaving

or leaving fluid thermistor.

pumpdown complete

 

or leaving fluid

 

 

Fluid Temperature

 

 

thermistor.

 

 

 

 

 

T079

 

Lead/Lag LWT

Thermistor outside range of

Chiller runs as a stand

 

Dual LWT thermistor failure,

Alert

Automatic

damaged cable/wire or

Thermistor Failure

–40 to 245 F (–40 to 118 C)

alone machine

 

 

 

wiring error.

 

 

 

 

 

 

 

 

 

 

 

 

 

T090

 

Circuit A Discharge

Outside of range (0 to

 

 

Transducer failure, poor

Alert

Circuit A shut down

Automatic

connection to MBB, or wiring

Pressure Transducer Failure

667 psig)

 

 

 

 

damage/error.

 

 

 

 

 

 

 

 

 

 

 

 

 

T091

 

Circuit B Discharge

Outside of range (0 to

 

 

Transducer failure, poor

Alert

Circuit B shut down

Automatic

connection to MBB, or wiring

Pressure Transducer Failure

667 psig)

 

 

 

 

damage/error.

 

 

 

 

 

 

 

 

 

 

 

 

 

T092

 

Circuit A Suction

Outside of range (0 to 420

 

 

Transducer failure, poor

Alert

Circuit A shut down

Automatic

connection to MBB, or wiring

Pressure Transducer Failure

psig)

 

 

 

 

damage/error.

 

 

 

 

 

 

T093

 

Circuit B Suction

Outside of range (0 to

 

 

Transducer failure, poor

Alert

Pressure Transducer

Circuit B shut down

Automatic

connection to MBB, or wiring

420 psig)

 

 

Failure

 

 

damage/error.

 

 

 

 

 

 

 

 

 

 

 

 

T094

Alert

Discharge Gas

Discharge thermistor (DTT) is

Digital compressor shut

Automatic

Thermistor failure, damaged

 

 

Thermistor Failure

either open or shorted

down.

 

cable/wire or wiring error.

67

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