Mitsubishi Heavy Industries FDT28KXE6A Service Manual page 23

(f) Protection for combination of outdoor units (Master unit)
The capacity of connectable outdoor units is checked when the communication check is performed after turning the power
ON.
If the checked result is other than the allowable combinations mentioned in the following table ① it is prohibited to start
operation due to outdoor unit combination error.
When this error occurs, the error code mentioned in the following table ② is displayed on the 7-segment display.
Combination list
Model
P735
P800
P850
P900
P960
P1010
P1065
P1130
P1180
P1235
P1300
P1360
Note (1) *1 Use FDC335KXE6-K. *2 Use FDC560KXE6-K.
Contents displayed on 7-segment display at the combination error
Code display area
OPE
(10) Auto backup operation
(a) Classi- c ation 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
E32: Open L3 phase on power supply at
primary side
E36: Discharge pipe temperature anomaly
E37: Outdoor heat exchanger and sub-cooling
coil temperature thernistor anomaly
E38: Outdoor air temperature thermistor
anomaly
E39: Discharge pipe temperature thermistor
anomaly
E40: High pressure anomaly
E41: Power transister overheat
E42: Current cut
Normal combination (HP)
HP
1
26 (12* + 14)
28 (14 + 14)
30 (14 + 16)
32 (16 + 16)
34 (16 + 18)
36 (18 + 18)
38 (18 + 20)
40 (20 + 20)
2
42 (20* + 22)
44 (22 + 22)
46 (22 + 24)
48 (24 + 24)
Data display area
Invalid combination of outdoor units
3
SW3-2ON
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-
21
12 + 14
14 + 14
14 + 16
16 + 16
16 + 18
18 + 18
18 + 20
20 + 20
20 + 22
22 + 22
22 + 24
24 + 24
Contents of invalid operation
Anomaly detection invalid code
E45: Communication error between inverter
PCB and outdoor control PCB
E48: Outdoor DC fan motor anomaly
E51: Power transister overheat
(Continuousness)
E53: Suction pipe temperature thermistor
anomaly
E55: Under-dome temperature thermistor
anomaly
E56: Power transitor temperature thermistor
anomaly
E59: Compressor startup failure
E60: Rotor position detection failure
-
SW3-2ON
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