Panasonic U-10MF1E8 Service Manual page 61

8. Charging Compressor Oil
(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, then open the upper and lower valves to begin charging oil into the charging tank.
Vacuum pump
When the predetermined amount of oil has been charged into the oil-charging tank, immediately close the lower
valve and start the vacuum pump to reduce the pressure below -101 kPa (-755 mmHg, 5 Torr). Then close the
upper valve and stop the vacuum pump.
Do this operation quickly because compressor oil easily absorbs moisture
CAUTION
from the air.
(3) Charging compressor oil into outdoor unit
Connect the lower valve to the low-pressure sensor outlet (with Schrader-type push-to-release valve) in the
outdoor unit to be oil-charged, and then connect the high-pressure sensor outlet (with push-to-release valve) to
the upper valve via the manifold gauge valves (at Hi-pressure gauge side). In addition, connect the suction line
service port (with push-to-release valve) to the DPR (Discharge Pressure Regulator). Carry out the connection
work quickly to avoid letting air enter.
• The hoses may be subject to internal pressure from the refrigerant inside the
CAUTION
• Since the DPR valve opens at pressures of 2.5 MPa and above, be sure to
Suction tube service port
(For 7.94mm-dia. connector)
Manifold gauge
Lo Hi
outdoor unit. A Schrader-type push-to-release valve is provided at each connection
port.
connect the DPR to the suction line service port (low-pressure side).
High-pressure outlet port
(For 7.94mm-dia. connector)
Low-pressure
outlet port
(For 7.94mm-
dia. connector)
First close the lower and then,
this one before stopping.
Upper valve
Close this valve before stopping.
Lower valve
Fig. 14
Upper valve
Manifold gauge
Lo Hi
Lower valve
Fig. 15
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3-WAY SYSTEM
Outdoor Unit Repair Procedures
Oil
DPR
2