Panasonic R410A Service Manual page 37

6. Charging Compressor Oil
Next, start Cooling mode operation of the outdoor unit to be oil-charged. When cooling operation reaches a stable
condition, open each valve corresponding to these procedures in the order given:
Procedure 1: Open the Hi-side gauge manifold valve
Procedure 2: Open the upper valve
Procedure 3: Open the lower valve
Using this series of procedures, the oil in the oil-charging tank will be pushed up by the pressurized refrigerant
under cooling operation. This charges the oil into the outdoor unit through the low-pressure outlet port. If you
wish, you can periodically close the upper valve of the oil-charging tank and shake the tank gently to check the
approximate amount of remaining oil inside.
Low-pressure outlet port
(For ø5/16" connector)
To terminate the oil charging work, do as follows:
First, close the Hi-side manifold gauge valve and wait momentarily until the Lo-pressure gauge reading shows
stable indication. Next, fully close the Hi-side manifold gauge valve (Procedure 1) and the lower valve (Procedure
3) from the oil-charging tank, in that order. (The above steps are used to equalize the internal pressure at the same
level as the low-pressure sensor outlet and letting refrigerant evaporate in the tank.)
Finally, connect the refrigerant recovery unit to the Lo-gauge side, shut down all indoor and outdoor units, and then
recover the remaining refrigerant in the oil-charging tank, manifold gauge valves, and connecting hoses. Perform
these procedures quickly and securely so that no air can enter. After, charge the necessary amount of new
refrigerant by referring to the "Installation Instructions" that came with the outdoor unit.
NOTE
To determine the completion of refrigerant recovery, follow the instructions that came with the refrigerant recovery
unit.
Liquid tube service port
(For ø5/16" connector)
Gas tube service port
(For ø5/16" connector)
Procedure 2: Open
the upper valve
Manifold
gauge
Lo Hi
Procedure 1:
Open the Hi-side
manifold gauge valve
Procedure 3:
Open the lower valve
Fig. 2-12
2 - 15
Mini VRF SYSTEM
Outdoor Unit Repair Procedures
DPR
Upper side
valve
Lower side
valve
1
2
3
4
5
6