System information

37
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-256
ALM-256 Protective
Limit — High Bearing
Temperature
Manual Unit shuts down.
Check oil heater for proper opera-
tion; confirm that oil heater is de-
energized when compressor is run-
ning.
Check for low oil level, partially
closed oil line isolation valves, or
clogged oil filter.
Check oil cooler refrigerant thermal
expansion valves; confirm that
expansion valve bulbs are secured
to the oil lines and insulated.
Check compressor bearing temper-
ature sensors accuracy and wiring
to IOB.
This fault can result from excessive
operation at low load with low water
flow to the evaporator or condenser.
Very high discharge and volute tem-
peratures may increase the oil
sump temperature. Elevated sump
temperature may result from an
excessively high oil level reaching
the bottom of the bull gear, causing
it to churn the oil.
Alm-257
ALM-257 Protective
Limit — High Condenser
Temperature
Manual Unit shuts down.
Check CONDENSER PRESSURE.
Check for high condenser water
temperatures, low water flow,
fouled tubes.
Check for division plate/gasket
bypass or plugged condenser water
strainers.
Check for noncondensables in con-
denser.
Check condenser pressure trans-
ducer wiring and accuracy to IOB.
Configure COND PRESS OVER-
RIDE 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.