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Possible causes of fault are low refrigerant charge, plugged
filter drier, or a faulty EXV or thermistor.
Code 48 Low suction superheat, Circuit A
Code 49
Low suction superheat, Circuit B
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 EXV or thermistor.
Code 50 Illegal configuration
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
i2G7
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 8
groups of S-digit numbers that must be entered. The first
4
groups must be entered under
17
a
subfunction. Groups
7 and 8 must be entered under
MH
subfunction.
Enter each group, then press the
H
key. Use the
down arrow
+
0
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.
Unit goes through normal shutdown when this command
is received, and goes through normal start-up when com-
mand is cancelled.
STANDARD: 040-060 50 Hz
040-070 60 Hz
r
----I------
,
1 CR’S
[CPCS ’ Sl
LEGEND
STANDARD: 070 50 Hz
ACCESSORY: 040-060 50 Hz
040-070 60 Hz
&I
COMM
CPCS
CR
DGT
DSIO
HPS
K
PWR
SNB
TB
TRAN
U
-
-
-
-
Fig.
IOA
-
24-V Safety Circuit Wiring (040-070)
52
Contactor
Circuit Breaker
Communications Bus
Compressor Protection
Control Module
Compressor Contactor Relay
Discharge Gas Thermostat (Optional)
Relay Module (Low Voltage)
High-Pressure Switch
Low
Vottage
Plug
Power
Snubber
Terminal Block
Transformer
Unloader