Panasonic U-8ME1E81 Service Manual page 86

7. Charging Compressor Oil
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 {-755mmHg, 5 Torr}.
Close the upper valve and then, stop the vacuum pump.
3 CAUTION
(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.
CAUTION
Low-pressure outlet port
(for ø7.94mm-dia connector)
Liquid tube service port
(for ø7.94mm-dia connector)
Manifold gauge
Do this operation quickly because compressor oil easily absorbs moisture from the
air.
• The hoses may be subject to internal pressure from the refrigerant inside the outdoor
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).
Type 8HP / 10HP / 12HP
Upper valve
Lower valve
Fig. 10
High-pressure outlet port
(for ø7.94mm-dia connector)
Manifold gauge
Lo
Hi
Lower valve
Gas tube service port
(for ø7.94mm-dia connector)
Fig. 11-a
3 - 20
2WAY SYSTEM
Outdoor Unit Repair Procedures
Close Open
Close Open
Oil
DPR
Upper valve