Charging Compressor Oil - Panasonic U-72MF2U9 Service Manual

7. Charging Compressor Oil

7. Charging Compressor Oil
7-1. If Refrigerant Has Already Been Charged to Outdoor Unit
Be sure to use an exclusive oil-charging tank for charging compressor oil. Prior to charging, carry out vacuum drying
inside the tank and take care that no air (in the form of bubbles) is permitted to enter the tank.
The oil charging procedures are given below.
* The receiver tank used for maintenance may be used as an exclusive oil-charging tank.
When installing the oil-charging
tank to the refrigerant system to
serve as a safety bypass circuit for
refrigerant, connect it to the suction
tube service port carefully to
1
avoid releasing refrigerant into the
atmosphere.
CAUTION
2
3
(1) Evacuation drying in oil-charging tank
With the lower side valve fully closed, open the upper side valve and connect it to the vacuum pump via the
manifold gauge valves as shown below. Run the vacuum pump and evacuate the tank until the pressure falls to
4
below –14.7 psig { -101 kPa, 5 Torr } for the evacuation drying. After the evacuation drying is finished, fully
close the upper valve. Next, fully close the manifold gauge valves and stop the vacuum pump.
CAUTION
5
6
7
8
9
Perform oil charging
work carefully so that no
liquid refrigerant enters
the charging tank.
To ensure proper evacuation, refer to the operating instructions
that came with the vacuum pump.
Vacuum pump
(DPR : CV623-081-7937)
Nipple
Packless valve
Manifold
gauge
Lo Hi
Upper side
valve
Lower side
valve
2 - 14
2WAY VRF SYSTEM
3WAY VRF SYSTEM
Outdoor Unit Repair Procedures
Outdoor Unit Repair Procedures
(Receiver-tank:
CV638-015-2988)
Open Close
Close
Fig. 8
Fig. 9