Panasonic U-72MF2U9 Service Manual page 12

2. Selecting Outdoor Unit for Operation
2-3. Outdoor Unit Stop Rules
2-3-1. Stopping of all outdoor units
When all outdoor units must stop, the units stop at the same time.
2-3-2. Stopping of individual outdoor units according to load of air-conditioning
● All cooling mode
Outdoor air temperature ≥ 113°F (45°C): All outdoor units will be operated. However, there is the outdoor unit
which has the stopped compressor according to load of air-conditioning.
69.8°F (21°C) < outdoor air temperature < 113°F (45°C): the outdoor unit which has the compressor with the
shortest amount of operating time continues to run and rest of the outdoor units may be stopped according to
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load air-conditioning.
The outdoor unit which has any compressors without operation may be stopped.
Outdoor air temperature ≤ 69.8°F (21°C): The outdoor unit which has the compressor with the shortest
amount of operating time continues to run and rest of the outdoor units may be stopped according to load air-
conditioning.
2
There is the outdoor unit which has only the operating compressor or uses only the heat exchanger with the
stopped compressor according to some conditions.
● All heating mode
The outdoor unit which has the compressor with the shortest amount of operating time continues to run and rest
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of the outdoor units may be stopped according to load air-conditioning.
● Mixed cooling/heating
The outdoor unit which has the compressor with the shortest amount of operating time continues to run and rest
of the outdoor units may be stopped according to load air-conditioning.
4
There is the outdoor unit which has only the operating compressor or uses only the heat exchanger with the
compressor stopped according to some conditions.
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3WAY VRF SYSTEM
Control Functions