Table 29 — Alarm and Alert Codes

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

ENTER and Manual backgroundManual backgroundManual background until the sub-menu item RCRN “RESET

ALL CURRENT ALARMS” is displayed. Press ENTER . The control will prompt the user for a password, by displaying PASS and WORD. Press ENTER to display the default pass- word, 1111. Press ENTER 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 ENTER . The alarms will be reset.

Table 29 — Alarm and Alert Codes

ALARM/

ALARM

 

WHY WAS THIS

ACTION TAKEN

RESET

PROBABLE

ALERT

OR

DESCRIPTION

ALARM

BY CONTROL

METHOD

CAUSE

CODE

ALERT

 

GENERATED?

 

 

 

 

 

 

 

 

 

 

 

T051

Alert

Circuit A, Compressor 1

Compressor feedback signal

Compressor A1 shut

Manual

High-pressure switch open,

 

 

Failure

does not match relay state

down.

 

faulty auxiliary contacts, loss

 

 

 

 

 

 

of condenser air, liquid

 

 

 

 

 

 

valve closed, filter drier

 

 

 

 

 

 

plugged, non-condensables,

 

 

 

 

 

 

operation beyond capability.

 

 

 

 

 

 

 

T052

Alert

Circuit A, Compressor 2

Compressor feedback signal

Compressor A2 shut

Manual

High-pressure switch open,

 

 

Failure

does not match relay state

down.

 

faulty auxiliary contacts, loss

 

 

 

 

 

 

of condenser air, liquid

 

 

 

 

 

 

valve closed, filter drier

 

 

 

 

 

 

plugged, non-condensables,

 

 

 

 

 

 

operation beyond capability.

T055

Alert

Circuit B, Compressor 1

Compressor feedback signal

Compressor B1 shut

Manual

High-pressure switch open,

 

 

Failure

does not match relay state

down.

 

faulty auxiliary contacts, loss

 

 

 

 

 

 

of condenser air, liquid

 

 

 

 

 

 

valve closed, filter drier

 

 

 

 

 

 

plugged, non-condensables,

 

 

 

 

 

 

operation beyond capability.

T056

Alert

Circuit B, Compressor 2

Compressor feedback signal

Compressor B2 shut

Manual

High-pressure switch open,

 

 

Failure

does not match relay state

down.

 

faulty auxiliary contacts, loss

 

 

 

 

 

 

of condenser air, liquid

 

 

 

 

 

 

valve closed, filter drier

 

 

 

 

 

 

plugged, non-condensables,

 

 

 

 

 

 

operation beyond capability.

 

 

 

 

 

 

 

A060

Alarm

Cooler Leaving Fluid

Thermistor outside range of

Chiller shutdown

Automatic

Thermistor failure, damaged

 

 

Thermistor Failure (T1)

–40 to 245 F (–40 to 118 C)

immediately

 

cable/wire or wiring error.

 

 

 

 

 

 

 

A061

Alarm

Cooler Entering Fluid

Thermistor outside range of

Chiller shutdown

Automatic

Thermistor failure, damaged

 

 

Thermistor Failure (T2)

–40 to 245 F (–40 to 118 C)

immediately

 

cable/wire or wiring error.

 

 

 

 

 

 

 

T068

None

Circuit A Return Gas Thermistor Failure

If return gas sensors are

None

Automatic

Thermistor failure, damaged

 

 

 

enabled (RG.EN) and

 

 

cable/wire or wiring error.

 

 

 

thermistor is outside range of

 

 

 

 

 

 

–40 to 245 F (–40 to 118 C)

 

 

 

T069

None

Circuit B Return Gas Thermistor Failure

If return gas sensors are

None

Automatic

Thermistor failure, damaged

 

 

 

enabled (RG.EN) and

 

 

cable/wire or wiring error.

 

 

 

thermistor is outside range of

 

 

 

 

 

 

–40 to 245 F –40 to 118 C)

 

 

 

T073

Alert

Outside Air Thermistor

Thermistor outside range of

Temperature reset

Automatic

Thermistor failure, damaged

 

 

Failure (T9)

–40 to 245 F (–40 to 118 C)

disabled. Chiller runs

 

cable/wire or wiring error.

 

 

 

 

under normal control/set

 

 

 

 

 

 

points. When capacity

 

 

 

 

 

 

reaches 0, cooler/pump

 

 

 

 

 

 

heaters are energized.

 

 

T074

Alert

Space Temperature

Thermistor outside range of

Temperature reset

Automatic

Thermistor failure, damaged

 

 

Thermistor Failure (T10)

–40 to 245 F (–40 to 118 C)

disabled. Chiller runs

 

cable/wire or wiring error.

 

 

 

 

under normal control/set

 

 

 

 

 

 

points.

 

 

T077

Alert

Circuit A Saturated

Faulty expansion valve,

Circuit A shutdown after

Automatic

Faulty expansion valve or

 

 

Suction Temperature

suction pressure transducer

pumpdown complete.

 

suction pressure transducer

 

 

exceeds Cooler Leaving

or leaving fluid thermistor

 

 

(T5) or leaving fluid

 

 

Fluid Temperature

(T1).

 

 

thermistor (T1).

 

 

 

 

 

 

 

T078

Alert

Circuit B Saturated

Faulty expansion valve,

Circuit B shutdown after

Automatic

Faulty expansion valve or

 

 

Suction Temperature

suction pressure transducer

pumpdown complete

 

suction pressure transducer

 

 

exceeds Cooler Leaving

or leaving fluid thermistor

 

 

(T6) or leaving fluid

 

 

Fluid Temperature

(T1).

 

 

thermistor (T1).

T079

Alert

Lead/Lag LWT

Thermistor outside range of

Chiller runs as a stand

Automatic

Dual LWT thermistor failure,

 

 

Thermistor Failure

–40 to 245 F (–40 to 118 C)

alone machine

 

damaged cable/wire or

 

 

 

 

 

 

wiring error.

 

 

 

 

 

 

 

T090

Alert

Circuit A Discharge

Voltage ratio more than

Circuit A shut down

Automatic

Transducer failure, poor

 

 

Pressure Transducer Failure

99.9% or less than .5%.

 

 

connection to MBB, or wiring

 

 

 

 

 

 

damage/error.

T091

Alert

Circuit B Discharge

Voltage ratio more than

Circuit B shut down

Automatic

Transducer failure, poor

 

 

Pressure Transducer Failure

99.9% or less than .5%.

 

 

connection to MBB, or wiring

 

 

 

 

 

 

damage/error.

T092

Alert

Circuit A Suction

Voltage ratio more than

Circuit A shut down

Automatic

Transducer failure, poor

 

 

Pressure Transducer Failure

99.9% or less than .5%.

 

 

connection to MBB, or wiring

 

 

 

 

 

 

damage/error.

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Sterling 30RA010-055 manual Alarm and Alert Codes