Mitsubishi Electric MUFZ-KJ-NAHZ Series, Service Manual

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• When the indoor units start operation while the defrosting of the outdoor unit is being performed, it takes a few minutes (up
to 10 minutes) to blow out warm air.
• In the heating operation, even though the indoor unit is not running, the room may get warm or the sound of refrigerant
flowing may be heard. This is not a malfunction. They happen because the refrigerant is continuously flowing inside the
unit.
5. Description of multi system air conditioner
OUTDOOR UNIT: MXZ series
The multi system outdoor unit can be connected to 2 or more indoor units.
• The units do not operate and the operation indicator lamp flashes as shown in the figure below when the total capacity of
the indoor units exceed the capacity of the outdoor unit. Do not connect the indoor units beyond the outdoor unit capacity.
• When operating the 2 or more indoor units connected to a multi system outdoor unit, set all the indoor units to the
same operation mode. If the COOL and the HEAT modes are selected for those indoor units, the indoor unit which has
started operation first has a priority. The other indoor units set to the different operation mode later do not start opera-
tion and the operation indicator lamp flashes as shown in the figure below.
OPERATION INDICATOR
Not lighted
Blinking
Lighted (Green)
(Green)
2%+%