Panasonic U-8MF2E8 Service Manual page 38

8. Oil Control
8-5. System Oil Recovery Control
Special control : System Oil Recovery Control features one of the functions of special control.
8-5-1. Start of System Oil Recovery Control
When operating compressor oil level 0
When operating inverter compressor oil level less than 1 is counted with accumulation for up to 60 minutes.
1
8-5-2. Simplified Flow of System Oil Recovery Control
Whole process
System oil recovery control shall be performed as the flow mentioned below.
(0) Normal operation
(1) Pre-processing time of system oil recovery control for 2.5 minutes
(2) System oil recovery control processing time *
(3) Post-processing time of system oil recovery control for 2 minutes
(4) Normal operation
1
* System oil recovery control process
Surely perform this system control by cooling cycle.
Even if the outdoor unit heat exchanger is functioning as an evaporator (all heating mode or mixed cooling/
heating operation), change the outdoor unit, indoor unit and solenoid valve kit to the cooling cycle and perform
the system oil recovery control.
Control time
Outdoor units
Electronic control valve
Solenoid valve kit
All Indoor Units
Fan
1
3 minutes
All outdoor units operate at maximum horsepower.
Valves at all indoor units operate at a fixed pulse according to the
indoor unit capacity.
Valve kits at all indoor units operate in cooling mode (ON status).
Stop and cooling (thermostat ON/OFF) and/or heating (thermostat ON)
operation of indoor units will be followed the indoor unit control system.
Fan and/or heating (thermostat OFF) operation of indoor unit will be
stopped.
The fan speed of the heating thermostat OFF high static pressure
ducted type indoor unit (type E1) is changed to LL.
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3WAY SYSTEM
Control Functions