49
Table 36 — 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
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 during nor-
mal 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. Correction
needed.
Chiller cannot start. See
Table 38.
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,
cooler pump interlock, or
flow switch
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,
cooler pump interlock, or
flow switch
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 trans-
mission.
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 during
pre-lube cycle.
Circuit cannot start Manual Low oil, oil pump failure,
oil solenoid failure, oil
transducer failure, check
valve failed open, oil shut-
off valve closed
60 Alarm Compressor A2
Pre-Start Oil Pressure
Oil Pump did not build
sufficient pressure during
pre-lube cycle.
Circuit cannot start Manual Low oil, oil pump failure,
oil solenoid failure, oil
transducer failure, check
valve failed open, oil shut-
off valve closed
61 Alarm Compressor B1
Pre-Start Oil Pressure
Oil Pump did not build
sufficient pressure during
pre-lube cycle.
Circuit cannot start Manual Low oil, oil pump failure,
oil solenoid failure, oil
transducer failure, check
valve failed open, oil shut-
off valve closed
62 Alarm Compressor A2
Pre-Start Oil Pressure
Oil Pump did not build
sufficient pressure during
pre-lube cycle.
Circuit cannot start Manual Low oil, oil pump failure,
oil solenoid failure, oil
transducer failure, check
valve failed open, oil shut-
off 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††
68 Alert Circuit B 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††
70 Alert High Leaving Chilled
Water Temperature
LCW read > LCW Delta
Alarm limit and total
capacity is 100% and
current LCW > LCW
reading 1 minute ago
Alert only. None. Automatic Building load greater
than unit capacity, low
water/brine flow, or com-
pressor fault. Check for
other alarms or alerts.
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