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
28 Alert Comp B1 Oil Pressure
Transducer Failure
Calibration offset more
than 6 PSIG or Voltage
ratio (volts read/ref. volt-
age) more than 99.9%
or less than 0.5%.
Comp B1 shut down Automatic Transducer failure,
power supply failure or
wiring damage/error.
29 Alert Comp B2 Oil Pressure
Transducer Failure
Calibration offset more
than 6 PSIG or Voltage
ratio (volts read/ref. volt-
age) more than 99.9%
or less than 0.5%.
Comp B2 shut down Automatic Transducer failure,
power supply failure or
wiring damage/error.
30 Alert Circuit A Economizer
Transducer Failure
Calibration offset more
than 6 PSIG or Voltage
ratio (volts read/ref. volt-
age) more than 99.9%
or less than 0.5%.
Circuit A shut down Automatic Transducer failure,
power supply failure or
wiring damage/error.
31 Alert Circuit B Economizer
Transducer Failure
Calibration offset more
than 6 PSIG or Voltage
ratio (volts read/ref. volt-
age) more than 99.9%
or less than 0.5%.
Circuit B shut down Automatic Transducer failure,
power supply failure or
wiring damage/error.
32 Alarm Transducer Supply Out-
side 4.5 to 5.5 Volts
Reference voltage mea-
sured at PSIO-1,
J7-34,35 less than 4.5 V
or greater than 5.5 V.
Chiller shut down Automatic Power supply failure or
wiring error. Low trans-
former voltage.
34 Alert 4-20 mA Reset Input
Out of Range
If configured and input
signal to PSIO-2,
J7-19,20(HX),
J7-22,23(GX) less than
2 mA or greater than
20 mA
Reset function disabled.
Normal set point used
Automatic Faulty signal generator,
wiring error, 500 ohm
resistor missing or not
properly installed.
35 Alert 4-20 mA Demand Limit
Input Out of Range
If configured and input
signal to PSIO-2,
J7-22,23(HX),
J7-13,14(GX) less than
2 mA or greater than
20 mA
Demand limit ignored.
Runs under normal con-
trol based on 100% de-
mand limit.
Automatic Faulty signal generator,
wiring error, 500 ohm
resistor missing or not
properly installed.
36 Alarm Loss of Communication
with ‘‘Hardware Point’’
PSIO-1 has lost com-
munication with one of
the points in Table 34.
See Table 34. Automatic Failed module, wiring
error, failed transformer,
loose connection plug,
wrong address
37 Alert Circuit A Low Saturated
Suction Temperature
SST reads 6 F (3.3 C)
or more below the
freeze point for 3 min-
utes. Point is 28 F
(−2.2 C) for water, set
point minus 8 F (4.4 C)
for brines.
Circuit A shut down Manual Low refrigerant charge,
plugged strainer, faulty
expansion valve. Low
water flow.
38 Alert Circuit B Low Saturated
Suction Temperature
SST reads 6 F (3.3 C)
or more below the
freeze point for 3 min-
utes. Point is 30 F
(−1.1 C) for water, cool-
ing set point minus 8 F
(4.4 C) for brines.
Circuit B shut down Manual Low refrigerant charge,
plugged strainer, faulty
expansion valve. Low
water flow.
40 Alert Compressor A1 Low Oil
Pressure
See Note 1. Comp A1 shut down Manual Low Water Temperature,
low refrigerant charge,
plugged oil filter, closed
oil valve, bad oil sole-
noid, compressor oil
check valve stuck, oil
line check valve stuck,
plugged oil strainer.
41 Alert Compressor A2 Low Oil
Pressure
See Note 1. Comp A2 shut down Manual Low Water Temperature,
low refrigerant charge,
plugged oil filter, closed
oil valve, bad oil sole-
noid, compressor oil
check valve stuck, oil
line check valve stuck,
plugged oil strainer
42 Alert Compressor B1 Low Oil
Pressure
See Note 1. Comp B1 shut down Manual Low Water Temperature,
low refrigerant charge,
plugged oil filter, closed
oil valve, bad oil sole-
noid, compressor oil
check valve stuck, oil
line check valve stuck,
plugged oil strainer
43 Alert Compressor B2 Low Oil
Pressure
See Note 1. Comp B2 shut down Manual Low Water Temperature,
low refrigerant charge,
plugged oil filter, closed
oil valve, bad oil sole-
noid, compressor oil
check valve stuck, oil
line check valve stuck,
plugged oil strainer
44 Alarm Circuit A 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