Panasonic U-72MF2U9 Service Manual page 38

8. Oil Control
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.
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
(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
2
* 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.
3
* If just before the operation is in heating mode or cooling/heating mixed operation mode, system oil recovery
control may sometimes be performed by only 1st heat exchanger or all heat exchanger.
Control time
Outdoor units
4
5
All Indoor Units
6
7
8
9
3 minutes
All outdoor units operate at maximum horsepower.
Valves at all indoor units operate at a fixed pulse according to the
Expansion valve
indoor unit capacity.
Solenoid valve kit 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
Fan
stopped.
The fan speed of the heating thermostat OFF Concealed Duct - High
Static type indoor unit (Type E1) is changed to LL.
1
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3WAY SYSTEM
3WAY VRF SYSTEM
Control Functions
Control Functions