Panasonic U-72MF2U9 Service Manual page 36

7. Tube Refrigerant Recovery Control
7. Tube Refrigerant Recovery Control
Control when outdoor unit heat exchanger is acting as an evaporator (when all units are in heating mode or at
start of mixed operation when heating load is high)
Control time
Outdoor units
All Indoor Units
1
* When the above operation is finished, normal operation starts at the horsepower determined by the indoor units
2 where thermostats are ON.
* When the horsepower of heating thermostat ON still remains greater than that of cooling thermostat ON during
control mentioned above, normal control is performed without stopping the compressor.
* When the horsepower of cooling thermostat ON is getting greater than that of heating thermostat ON during
control mentioned above, once stop the outdoor unit after completion of control.
3
Then change the heat exchanger acting as an evaporator to a condenser and resume the operation.
4
5
6
7
8
9
Minimum 1 minute – Maximum 20 minutes (Until Tc
All outdoor units operate at maximum horsepower.
Expansion valve Valves at all indoor units operate at 250 pulses.
Solenoid valve kit Valve kits at all indoor units operate in heating mode (ON status)
Fan
As for heating thermostat ON indoor units, follow the indoor unit
control system.
Fan and cooling (thermostat ON/OFF) and/or heating (thermostat OFF)
operation of indoor unit will be stopped.
The fan speed of the heating thermostat OFF Concealed Duct - High
Static type indoor unit (Type E1) is changed to LL.
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3WAY VRF SYSTEM
3WAY SYSTEM
Control Functions
Control Functions
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95°F (35°C))