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6. Charging Compressor Oil
6-1. 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 of
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 gas
line service port carefully to avoid
releasing refrigerant into the
atmosphere.
Perform oil charging
work carefully so that no
CAUTION
liquid refrigerant enters
the charging tank.
(1)
Evacuation drying in oil-charging tank
With the bottom 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 below –14.7 psig (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.
To ensure proper evacuation, refer to the operating instructions that came with
CAUTION
the vacuum pump.
Vacuum pump
(2) Charging compressor oil into oil-charging tank
Connect a piece of pipe to the lower valve and then insert the other end deeply into the bottom of the oil
container. Make sure you avoid letting any air be sucked into the tube. Next, run the vacuum pump and open
the manifold gauge valves, open the upper and lower valves to begin charging oil into the charging tank.
After the tank is charged, close the lower side valve and draw off any moisture that may have accumulated.
(DPR: 623-081-7937)
Packless valve
Manifold
gauge
Lo
Hi
Fig. 9
2 - 13
Outdoor Unit Repair Procedures
Nipple
Fig. 8
Upper side valve
Open to run,
then close to stop
Lower side valve
Close to stop
Mini ECO-i SYSTEM
(Receiver tank:
638-015-2988)
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