Filter
Top Products
If oil pressure differential is less than set point for more
than 2 minutes at start-up, or more than one minute during
normal operation, affected circuit shuts down without going
through pumpout process. Reset is manual with LOCAL/
ENABLE-STOP-CCN switch, and start-up follows normal
sequence. Factory configured differential oil pressure is
6 psig.
Possible causes of fault are faulty compressor, expansion
valve, crankcase heater or transducer, refrigerant over-
charge, insufficient oil charge, or tripped circuit breaker.
Code 42 Cooler freeze protection (alarm)
If cooler entering or leaving water temperature is below
34° F (1.1° C) for water or more than 8° F (4.4° C) below
set point for brine, unit shuts down without pumpout. Chilled
water pump continues to run if controlled by chiller con-
trols. Reset is automatic when leaving fluid temperature reaches
6° F (3° C) above set point, providing there has been no prior
occurrence of this fault the same day. If fault has occurred
previously the same day, reset is manual with LOCAL/
ENABLE-STOP-CCN switch.
Possible causes of fault are low fluid flow or faulty
thermistor.
Code 43 Low fluid flow (alarm)
If any compressors are operating and entering fluid tem-
perature is 3° F (1.7° C) or more below leaving fluid tem-
perature for more than one minute, unit shuts down without
pumpout. Chilled fluid pump also shuts down. Reset is manual
with LOCAL/ENABLE-STOP-CCN switch, and start-up fol-
lows normal sequence.
This is a suitable method for sensing low fluid flow be-
cause entering fluid thermistor is in the cooler shell and re-
sponds more quickly to compressor operation than the leav-
ing fluid thermistor in the leaving water nozzle. Possible causes
of fault are faulty chilled fluid pump, control or thermistor.
Code 44 Low cooler suction temperature, Circuit A (alert)
Code 45 Low cooler suction temperature, Circuit B (alert)
If saturated suction temperature is less than 32 F (0°C)
and is 20° F (11° C) for water or 30° F (16° C) for brine or
more below leaving fluid temperature, mode 14 is dis-
played. Unit continues to run, but additional compressors are
not allowed to start. If condition persists for more than
10 minutes, fault code is displayed, and unit shuts down with-
out pumpout. Reset is manual with LOCAL/ENABLE-STOP-
CCN switch, and start-up follows normal sequence.
Possible causes of fault are low refrigerant charge, plugged
filter drier, or a faulty expansion valve or thermistor.
Code 46 High suction superheat, Circuit A (alert)
Code 47 High suction superheat, Circuit B (alert)
If expansion valve is fully open, suction superheat is greater
than 75 F (42 C), and saturated evaporator temperature is
less than MOP (maximum operating pressure) for more than
5 minutes, unit shuts down after normal pumpout process.
Reset is manual with LOCAL/ENABLE-STOP-CCN switch,
and start-up follows normal sequence.
Possible causes of fault are low refrigerant charge, plugged
filter drier, or a faulty expansion valve or thermistor.
Code 48 Low suction superheat, Circuit A (alert)
Code 49 Low suction superheat, Circuit B (alert)
If EXV is at minimum position, suction superheat is less
than 10° F (5.5° C) or saturated evaporator temperature is
greater than MOP (maximum operating pressure) for more
than 5 minutes, affected circuit shuts down after going through
pumpout process. Reset is manual with LOCAL/ENABLE-
STOP-CCN switch, and start-up follows normal sequence.
Possible causes of fault are faulty expansion valve or
thermistor.
Code 50 Illegal configuration (alarm)
This fault indicates a configuration error. Unit is not al-
lowed to start. Check all configuration data and set points
and correct any errors.
Code 51 Initial configuration required (alarm)
This fault indicates factory configuration has not been done,
and unit is not allowed to start. Refer to unit wiring
label diagrams for factory configuration codes. There are
9 groups of 8-digit numbers that must be entered. The first
7 groups must be entered under subfunction. Groups
8 and 9 must be entered under subfunction.
Enter each group, then press the key. Press the
down arrow after each group to bring up the next
empty screen. Unit should start after factory and field con-
figurations are correctly entered.
The usual cause of this fault is replacement of the pro-
cessor module. Refer to instructions accompanying the re-
placement module.
Code 52 Emergency stop by CCN command (alarm).
Unit shuts down immediately without pumpout when this
command is received, and goes through normal start-up when
command is cancelled.
Code 53 Cooler pump interlock failure — Contacts fail to
close at start-up (alarm)
If the unit is configured for cooler pump control and cooler
pump interlock, and the interlock fails to close within one
minute of starting the cooler pump, the unit is shut down
without pumpout. The cooler pump is also shut down. Reset
is manual with the LOCAL/ENABLE-STOP-CCN switch,
and start-up follows the normal sequence.
Possible causes are:
1. Interlock switch fails to close within one minute after chilled
water pump starts
2. Interlock switch opens during unit operation
3. Interlock voltage is detected, but unit is not configured
for interlock
4. Interlock voltage is outside its valid range
If any of these conditions occur, all compressors are dis-
abled and, if running, shutdown occurs without pumpout.
Chilled fluid pump also shuts down. Reset is manual, with
LOCAL/ENABLE-STOP-CCN switch. Most probable cause
of this fault is shutdown or failure of chilled fluid pump to
start. Other possibilities are improper configuration or wir-
ing errors.
Code 54 Cooler pump interlock failure — Contacts open
during normal operation (alarm)
If the unit is configured for cooler pump control and cooler
pump interlock, and the interlock opens during normal op-
eration, the unit is shut down without pumpout. The cooler
pump is also shut down. Reset is manual with the LOCAL/
ENABLE-STOP-CCN switch, and startup follows the nor-
mal sequence.
Possible causes are:
1. Interlock switch fails to close within one minute after chilled
water pump starts
2. Interlock switch opens during unit operation
3. Interlock voltage is detected, but unit is not configured
for interlock
4. Interlock voltage is outside its valid range
If any of these conditions occur, all compressors are dis-
abled and, if running, shutdown occurs without pumpout.
Chilled fluid pump also shuts down. Reset is manual, with
54