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Alarm Codes
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Following is a detailed description of
each alarm code error and possible cause. Manual reset of
an alarm is accomplished by moving LOCAWENABLE-
STOP-CCN Switch to STOP position, then back to LO-
CAL or CCN position. See Table 14 for listing of each alarm
code.
Code 0 No alarms exist
Codes 1
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8 Compressor failure
If DSIO-LV or -EXV relay module control relay feed-
back switch or signal is sensed as open during operation of
a compressor, microprocessor detects this and stops com-
pressor, energizes alarm light, and displays a code of I, 2,
3, 4, 5, 6, 7, or 8 depending on the compressor. Compres-
sor locks off; to reset, use manual reset method.
If lead compressor in a circuit shuts down, the other com-
pressors in the circuit stop and lock off. Only the alarm
mode for lead compressor is displayed.
The microprocessor is also programmed to indicate com-
pressor failure if feedback terminal on DSIO-LV or -EXV
53
terminal strip receives voltage when compressor is not
supposed to be on.
Table 14
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Alarm Codes
PROBABLE CAUSE
DESCRIPTION
No Alarms Exist
ACTION TAKEN
BY CONTROL
-
CKT
PUMPDOWN
-
No
- -
Compressor Al failure
Circuit A shut down
Manual
Compressor A2, A3, A4 failure Compressor shut down
Compressor Bl failure
Circuit B shut down
Compressor B2; 83, 84 failure
Compressor shut down
Leaving water thermistor failure Unit shut down
Entering water thermistor failure Unit shut down
Compressor Al sensor failure
Circuit A shut down
Compressor
Bl
sensor failure Circuit B shut down
Reset thermistor failure Normal set point used
Manual
Manual
Manual
Auto
I
Auto
Auto
Auto
Auto
Discharge pressure transducer failure, circuit A
Circuit A shut down
Discharge pressure transducer failure, circuit B
Circuit B shut down
Suction pressure transducer failure, circuit A Circuit A shut down
Circuit B shut down
Circuit A shut down
Auto.
Auto
Suction pressure transducer failure, circuit B
Oil pressure transducer failure, circuit A
Oil pressure transducer failure, circuit B
Circuit B shut down
Transducer supply voltage low
Unit shut down
Interlock switch oaen Unit shut down
Yes
No
Yes
Yes
Yes
Yes
Yes
No
Yes
Yes
No
No
No
NO
No
No
No
No
No
Auto
Auto.
Auto.
Auto
Auto Unit voltage low or PSI faulty
Manual
Chilled water pump inoperative
4-20 mA reset input failure Normal set point used
4-20
mA
demand limit failure
Demand limit ignored
Loss of communication with DSIO-LV Unit shut down
Auto
Auto
Auto.
Loss of communication with DSIO-EXV
Unit shut down
Loss of communication with 4 In/4 Out module Unit shut down
No
Yes
-
No
No
Auto
Auto
Not used
I
-
Low refrigerant pressure circuit A
Low refrigerant pressure circuit B
-
-
*
Low refrigerant charge, plugged filter
drier, faulty EXV
*
Low refri erant charge, plugged filter
drier.
I”
fau tv EXV
oil pressure circuit A Circuit A shut down
No
No
No
~,
3
Manual
Faulty EXV, transducer, or thermistor
Manual Faultv EXV, transducer, or thermistor.
Manual
oil pressure circuit B Circuit B shut down No
Manual
42 Cooler freeze protection Unit shut down
43
Low cooler water flow
Unit shut down
Low suction temperature circuit A
Low suction temperature circuit B
Circuit A shut down
after 10 minutes
Circuit B shut down
afler
10
minutes
No
No
No
No
Manual
Manual
Manual
High suction superheat circuit A Circuit A shut down
Manual
I
Low charge, faulty EXV or
thermistor, or plugged filter drier
High suction superheat circuit B Circuit B shut down
Yes
Yes
Low suction superheat circuit A
Low suction superheat circuit B
Illegal configuration
Circuit A shut down
Circuit 6 shut down
Unit cannot start
Initial configuration required Unit cannot start
Emergency stop by CCN command Unit shut down
Yes
Yes
-
-
Yes
Manual
Manual
Manual
Manual
Configuration error
Manual
Configuration omitted
CCN
Network command.
DISPLAY
0
1
2, 3, 4
5
6,
7,
8
9
10
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
44
45
46
47
48
49
50
51
52
High-pressure switch trip, discharge gas
thermostat trip, or wiring error
CPCS Ground Fault Protection
Thermistor or transducer failure
or wiring error.
Transducer failure or wiring error
I
Wiring error
or improper
or faulty module
address code
Low oil level, circuit breaker trip,
faulty EXV, crankcase heater,
or Pressure Transducer
Low oil level, circuit breaker trip,
fautty EXV, crankcase heater,
or
oressure
transducer
Low water flow or faulty thermistor
Chilled water pump failure
or faulty thermistor
Faulty EXV or thermistor
Faulty EXV or thermistor
Low charge, faulty EXV or
thermistor, or plugged filter drier.
Faulty EXV or thermistor
Faultv EXV or thermistor
LEGEND
ES
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Compressor Protection Control Module
*Reset automatic first time, manual if repeated same day
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Power Supply
49