System information

38
Table 15 — PIC 5 Alarm Codes (cont)
ALARM
CODE
(ALARMRST)
ALARM TEXT
DESCRIPTION
RESET TYPE
ACTION TAKEN BY
CONTROL
POSSIBLE CAUSE
PROTECTIVE LIMITS (CONT)
Alm-259
ALM-259 Protective
Limit — Excessive Com-
pressor 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
temperatures, low water flow,
fouled tubes.
Check CONDENSER APPROACH.
Check condenser water strainers.
Check for division plate/gasket
bypass.
Check for noncondensables in con-
denser.
Check surge prevention parameters
in OPTIONS screen.
Compare cooling tower control set-
tings and performance against
design/selection 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 Freeze
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 liq-
uid line isolation valve is open.
Check for proper Chilled Water flow
and temperature.
Confirm that condenser water
enters bottom row of condenser
tubes first (reversed condenser
water flow may cause refrigerant to
stack in the condenser).
Check evaporator pressure trans-
ducer and evaporator refrigerant liq-
uid temperature sensor.
Check for evaporator water box
division plate gasket bypass.
Check for fouled tubes.