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 > 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 > 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.