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Table 17 — PIC 5 Alarm Codes (cont)
ALARM
CODE
(ALARMRST)
ALARM TEXT
DESCRIPTION
RESET TYPE
ACTION TAKEN
BY CONTROL
POSSIBLE CAUSE
PROTECTIVE LIMITS (CONT)
Alm-257
ALM-257 Protective Limit
— High Condenser
Temperature
Manual
Unit shuts down.
Check CONDENSER PRESSURE.
Check for high condenser water tem-
peratures, low water flow, fouled tubes.
Check for division plate/gasket bypass
or plugged condenser water strainers.
Check for noncondensables in condenser.
Check condenser pressure transducer
wiring and accuracy to IOB.
Configure COND PRESS OVERRIDE in
configuration screen.
NOTE: This alarm is not caused by the
high condenser pressure switch.
Alm-258
ALM-258 Protective Limit
— Spare Safety Device
Manual
Unit shuts down.
Spare safety input has been closed.
Alm-259
ALM-259 Protective Limit
— Excessive Compressor
Surge
Manual
Unit shuts down.
Five SURGE PROTECTION COUNTS
occurred within SURGE TIME PERIOD.
VFD Only: Surge prevention alarm
declared when ACTUAL VFD SPEED is
at least 90%.
Check for high condenser water tem-
peratures, low water flow, fouled tubes.
Check CONDENSER APPROACH.
Check condenser water strainers.
Check for division plate/gasket bypass.
Check for noncondensables in condenser.
Check surge prevention parameters in
OPTIONS screen.
Compare cooling tower control settings
and performance against design/selec-
tion temperatures across the entire
operating range of the chiller.
Check EVAPORATOR APPROACH and
chilled water flow.
Alm-260
ALM-260 Protective Limit
— Compressor Start Relay
Start Failure
Manual
Unit shuts down.
Check motor starter 1M contactor wiring.
Check ISM current sensors.
Alm-261
ALM-261 Protective Limit
— Evaporator Frozen
Manual
Unit shuts down.
Check CALC EVAP SAT TEMP, EVAP
REFRIG LIQUID TEMP, and EVAP
REFRIG TRIPPOINT.
Check for proper refrigerant charge.
Check float valve operation.
Confirm that optional refrigerant liquid
line isolation valve is open.
Check for proper Chilled Water flow and
temperature.
Confirm that condenser water enters bot-
tom row of condenser tubes first (reversed
condenser water flow may cause refriger-
ant to stack in the condenser).
Check evaporator pressure transducer
and evaporator refrigerant liquid tem-
perature sensor.
Check for evaporator water box division
plate gasket bypass.
Check for fouled tubes.
Alm-262
ALM-262 Protective Limit
— Condenser Frozen
Manual
Unit shuts down.
The Cond Sat Refrig Temp is less than
the Condenser Freeze Point.
Check Condenser Freeze Point in
configuration.
Condenser water too cold or chiller shut
down with brine below 32° F (0° C) in
cooler so equalization temperature in
chiller approached 32° F (0° C).
Check condenser pressure transducer
and wiring to IOB.
Check condenser water temperature
sensors and wiring to IOB.
Check refrigerant charge.
Alm-263
ALM-263 Protective Limit
— Invalid Diffuser Config
Manual
Unit shuts down.
Check SRD Configurations.
