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Emergency Operation Mode - Mitsubishi Electric PURY-HP72 Service Handbook

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[5-2 Outdoor Unit Control ]
5-2-15

Emergency Operation Mode

1. Problems with the outdoor unit
The HP144 through HP192 models of unit have a mode that allows the outdoor unit to perform an emergency operation when
the other outdoor unit in the system malfunctions.
This mode can be started by performing an error reset via the remote controller.
(1) Starting the emergency operation
1) When an error occurs, the error source and the error code will be displayed on the display on the remote controller.
2) The error is reset using the remote controller.
3) If an error code appears that permits an emergency operation in step 1) above, (See the table below.), the retry operation
starts.
4) If the same error is detected during the retry operation (step 3 above), an emergency operation can be started by resetting
the error via the remote controller.
Error codes that permit an emergency operation (Applicable to both OC and OS)
Trouble source
0403
4220,4225
4230,4235
Compressor
4240,4245
Fan motor
Inverter
4250,4255
5110
5301
5305
Thermistor
TH4
5104
TH5
5105
TH6
5106
TH7
5107
TH9
5109
TH11
5111
Power
4102
4115
Emergency operation pattern (2 outdoor units)
1) If an attempt is made to put into operation a group of indoor units whose total capacity exceeds the maximum allowable ca-
pacity, some of the indoor units will go into the same condition as Thermo-OFF.
HWE13080
Error codes that permit an
emergency operation
Serial communication error
Bus voltage drop
Heatsink overheat protection
Overload protection
Overcurrent relay trip
Heatsink temperature sensor failure (THHS)
Current sensor/circuit failure
Position error
Discharge temperature sensor failure
Accumulator inlet temperature sensor failure
Subcool heat exchanger liquid outlet sensor failure
Outside air temperature sensor failure
ON-defrost temperature sensor fault
ON-defrost temperature sensor fault
Open phase
Power supply sync signal abnormality
OC
OS
Cooling
Emergency
operation
Heating
Maximum total capacity
of indoor units (Note 1)
- 133 -
Error code description
OC failure
OS failure
pattern
pattern
Trouble
Normal
Normal
Trouble
Permitted Permitted
Permitted Permitted
60%
GB

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