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'14 • KX-SM-204
(6) Auto backup operation
(a) Classi cation of auto backup operations
When the auto backup operation is enabled, anomaly stops are classifiedas follows and countermeasures are provided for
respective categories.
System stop: All stop including master/slave units
Unit stop: Stop in the unit of outdoor unit
Compressor stop: Stop in the unit of compressor
(b) Control contents of auto backup operation
(i) Condition of auto backup operation is established when the dip switch SW3-2 on the PCB of master unit is turned
ON (selected).
(ii) However, the switching of SW3-2 is effective only at the power on. (It does not become effective unless the power
supply is reset.)
(iii) Anomaly contents in the following table are invalid and are not detected when the auto backup is effective.
Anomaly detection invalid code
SW3-2ON
Anomaly detection invalid code
SW3-2ON
E32: Open L3 phase on power supply at
primary side
E45: Communication error between inverter
PCB and outdoor control PCB
E36: Discharge pipe temperature error
E48: Outdoor DC fan motor anomaly
E37: Outdoor heat exchanger and sub-cooling
coil temperature thernistor anomaly
E51: Power transister overheat
(Continuousness)
E38: Outdoor air temperature thermistor
anomaly
E53: Suction pipe temperature thermistor
anomaly
E55: Under-dome temperature thermistor
anomaly
E39: Discharge pipe temperature thermistor
anomaly
E40: High pressure anomaly
E56: Power transitor temperature thermistor
anomaly
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E41: Power transister overheat
E58: Anomalous compressor by loss
synchronism
E42: Current cut
E44: Liquid flooding anomaly
E59: Compressor startup failure
E60: Rotor position detection failure
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(iv) If any anomaly occurs when the auto backup is effective, the operation output (CnH), Anomaly output (CnY), 7-seg-
ment display and LED show as follows.
1) At the system stop
Operation output on the master unit is turned OFF, the Anomaly output is turned ON, 7-segment display and
LED show the anomaly, and the remote control displays E??. (To reset the anomaly, it is necessary to reset the
inspection from the remote control.)
2) At the unit stop
On the anomaly occurred unit only, the operation output is turned OFF, the Anomaly output is turned ON, 7-segment
display and LED show the anomaly and normal units continue their operation ON(or stop).
To reset the state of anomaly on the unit the anomaly occurred, it depends on the condition to reset the state of each anomaly.
3) At the compressor stop
Only the compressor concerned stops, previous states are maintained on the operation output, anomaly output,
7-segment display and LED. To reset the state of anomaly on the compressor, it depends on the condition to reset
the state of each anomaly.
