Charging Compressor Oil - Panasonic U-8MF2E8 Service Manual

7. Charging Compressor Oil

Vacuum pump
Vacuum pump
When the predetermined amount of oil has been charged into the oil-charging tank, immediately close the lower
valve. Next, run the vacuum pump until the system pressure reaches lower than -101kPa(-755 mmHg, 5 Torr).
Close the upper valve and then, stop the vacuum pump.
Do this operation quickly because compressor oil easily absorbs moisture from the
CAUTION
air.
(3) Charging compressor oil into outdoor unit
Connect the lower valve to the low-pressure outlet (with Schrader-type push-to-release valve) in the outdoor
unit to be oil-charged, and then connect the high-pressure outlet (with push-to-release valve) to the upper valve
via the manifold gauge valves (at Hi-pressure gauge side). In addition, connect the gas tube 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 outdoor
CAUTION unit. A Schrader-type push-to-release valve is provided at each connection port.
• Since the DPR valve opens at pressures of 2.5 MPa and above, be sure to connect the
DPR to the gas tube service port (low-pressure side).
High-pressure outlet port
(for ø7.94mm-dia connector)
Low-pressure outlet port
(for ø7.94mm-dia connector)
Suction tube service port
(for ø7.94mm-dia connector)
Discharge tube service port
(for ø7.94mm-dia connector)
Liquid tube service port
(for ø7.94mm-dia connector)
Oil balance tube service port
(For 7.94mm-dia. connector)
Lo Hi
Manifold gauge
Fig. 10
Fig. 11
2 - 15
Outdoor Unit Repair Procedures
Close Open
Upper valve
Close Open
Lower valve
DPR
Upper valve
Manifold gauge
Lower valve
Lo Hi
3WAY SYSTEM
Oil
2