Specifications
Table 33 — Alarm and Alert Codes (cont)
ALARM/ALERT
CODE
ALARM OR
ALERT
DESCRIPTION
WHY WAS THIS
ALARM GENERATED?
ACTION TAKEN
BY CONTROL
RESET
METHOD
PROBABLE
CAUSE
45 Alarm Circuit B Condenser
Freeze Protection
(alarm ignored for brine
chillers)
For W/C chillers only , if
SCT <34 F (1.1 C)
Chiller shut down. Turn
Cond pump On if Chiller
is Off
Automatic Failed/bad discharge
pressure transducer,
refrigerant leak,
configured for water-
cooled condenser
46 Alarm Cooler Freeze Protec-
tion
Cooler EWT or LWT
less than freeze point.
Freeze point is 34 F
(1.1 C) for water, cool-
ing set point minus 8 F
(4.4 C) for brines.
Chiller shut down.
Leave Cooler pump on.
Turn Cooler pump On if
Chiller is Off.
Automatic** Faulty thermistor, low
water flow
47 Alert Circuit A High Saturated
Suction Temperature
After first 90 seconds,
SST > 55 F (12.8 C)
and EXV < 1% for
5 minutes
Circuit A shut down Manual Faulty expansion valve,
liquid level sensor or
transducer.
48 Alert Circuit B High Saturated
Suction Temperature
After first 90 seconds,
SST > 55 F (12.8 C)
and EXV < 1% for
5 minutes
Circuit B shut down Manual Faulty expansion valve,
liquid level sensor or
transducer.
49 Alarm Loss of Condenser Flow Flow switch not closed
within 1 minute after
pump is started or if
flow switch opens dur-
ing normal operation for
>10 seconds
Chiller shut down Manual Low condenser water
flow, failed condenser
pump
50 Alarm Illegal Configuration x Illegal Configuration has
been entered. Correc-
tion needed.
Chiller cannot start. See
Table 35.
Manual Configuration error.
51 Alarm Initial Configuration
Required
No configuration has
been entered.
Chiller cannot start Manual Configuration omitted.
52 Alarm Unit is in Emergency
Stop
CCN command received
to shut unit down.
Chiller shut down CCN/
Automatic
Network command.
53 Alarm Cooler Pump Interlock
Failed at Start-Up
Interlock did not close
within 1 minute after
transition
Chiller shut down. Pump
turned off.
Automatic Failure of cooler pump
or controls
54 Alarm Cooler Pump Interlock
Opened Unexpectedly
Interlock opened for at
least 5 seconds during
operation
Chiller shut down. Pump
turned off.
Automatic Failure of cooler pump
or controls
55 Alarm Cooler Pump Interlock
Closed When Pump
OFF
Interlock closed when
pump relay is off
Cooler pump remains
off. Unit prevented from
starting.
Manual Failure of cooler pump
relay or interlock,
welded contacts
56 Alert Loss of Communication
with WSM
No communications
have been received by
PSIO-1 within 5 minutes
of last transmission.
WSM forces removed.
Runs under own control
Automatic Failed module, wiring
error, failed transformer,
loose connection plug,
wrong address
57 Alert Circuit A Liquid Level
Sensor Failure
Sensor reads 245 F
(118 C) or −40 F
(−40 C) with SST > 9 F
(−12.8 C)
Runs, but controls EXV
based on Disch. Super-
heat
Automatic Thermistor circuit open,
faulty liquid level sensor,
wiring error
58 Alert Circuit B Liquid Level
Sensor Failure
Sensor reads 245 F
(118 C) or −40 F
(−40 C) with SST > 9 F
(−12.8 C)
Runs, but controls EXV
based on Disch. Super-
heat
Automatic Thermistor circuit open,
faulty liquid level sensor,
wiring error
59 Alarm Compressor A1
Pre-Start Oil Pressure
Oil Pump did not build
sufficient pressure dur-
ing pre-lube cycle.
Circuit cannot start Manual Low oil, oil pump failure,
oil solenoid failure, oil
transducer failure, check
valve failed open, oil
shutoff valve closed
60 Alarm Compressor A2
Pre-Start Oil Pressure
Oil Pump did not build
sufficient pressure dur-
ing pre-lube cycle.
Circuit cannot start Manual Low oil, oil pump failure,
oil solenoid failure, oil
transducer failure, check
valve failed open, oil
shutoff valve closed
61 Alarm Compressor B1
Pre-Start Oil Pressure
Oil Pump did not build
sufficient pressure dur-
ing pre-lube cycle.
Circuit cannot start Manual Low oil, oil pump failure,
oil solenoid failure, oil
transducer failure, check
valve failed open, oil
shutoff valve closed
62 Alarm Compressor B2
Pre-Start Oil Pressure
Oil Pump did not build
sufficient pressure dur-
ing pre-lube cycle.
Circuit cannot start Manual Low oil, oil pump failure,
oil solenoid failure, oil
transducer failure, check
valve failed open, oil
shutoff valve closed
63 Alarm Circuit A&B OFF for
Alerts. Unit down
Control has shut down
both circuits due to
alerts.
None Automatic Check individual alarms
64 Alert Circuit A Loss of Charge Discharge pressure
reading <10 PSIG for
30 seconds
Circuit A shut down Manual Refrigerant leak or
transducer failure
65 Alert Circuit B Loss of Charge Discharge pressure
reading <10 PSIG for
30 seconds
Circuit B shut down Manual
66 Alarm Loss of Communication
with FSM
No communications
have been received by
PSIO-1 within 5 minutes
of last transmission.
FSM forces removed
Runs under own control
Automatic Wiring faulty or module
failure
67 Alert Circuit A High Discharge
Pressure
SCT > MCT_SP + 5 F
(2.8 C)
Circuit shut down Automatic** Faulty transducer/high
pressure switch, low/
restricted condenser
air/water flow.††
47