Mitsubishi Electric CITY MULTI PUHY-400YMF-B, Service Handbook

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Note 1: If Step 4 is interrupted (compressor stopped by thermostat OFF or regular stop), Step 4 will be redone at
restart.
Note 2: If Step 5 is interrupted, Step 5 will be redone at restart after performing Step 4 several times.
Note 3: If Step 6 is interrupted, Step 5 and Step 6 will be redone at restart after performing Step 4 several times.
(15) Operation Mode
1) Operating modes of the indoor unit
The following five modes can be set by the remote control.
1 Cooling mode
2 Heating mode
3 Dry mode
4 Fan mode
5
Stop mode
2) Operating modes of the outdoor unit
The following are the 3 modes for the outdoor unit.
1 Cooling mode All indoor units are operated in cooling mode
2 Heating mode All indoor units are operated in heating mode
3
Stop mode All indoor units are in fan or stop mode
Note: If the outdoor unit has been in the cooling mode and the other indoor units (in stop, fan, thermostat off) are set
to the heating mode, those indoor units will not be operated and the heating indicator will be flashed on the
remote controller. The reverse also applies when the outdoor unit is operated in the heating mode and the
cooling indicator will be flashed on the remote controller.
(Example 4)
A-minute
Less than
10 minutes
Step 5
Step 6 Step 5
Step 6
Step 4
Step 5 Step 4
Step 6
10
minutes
5
minutes
Less than
10 minutes
5
minutes
5
minutes
ON/OFF of
No.1 compressor
ON/OFF of
No.2 compressor
ON/OFF of
No.3 compressor
End of initial operation mode
Note 3
Step 4