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W-2WAY ECO-i SYSTEM
Outdoor Unit Repair Procedures
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 con-
tainer. 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.
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 -14.7 psig (5 Torr).
Close the upper valve and then, stop the vacuum pump.
Do this operation quickly because compressor oil easily absorbs moisture from
the 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 out
door unit. A Schrader-type push-to-release valve is provided at each connection
port.
• Since the DPR valve opens at pressures of 362.6 psi and above, be sure to con-
nect the DPR to the gas tube service port (low-pressure side).
CAUTION
CAUTION
Upper valve
Lower valve
Vacuum pump
Manifold
gauge
Oil
Close Open
Close Open
DPR
Low-pressure
outlet port
(For 5/16"
(7.94mm)-
dia. connector)
Upper valve
Lower valve
Close
Close
Gas tube
service port
(For 5/16"
(7.94mm)-
dia. connector)
Manifold
gauge
Lo Hi
High-pressure
outlet port
(For 5/16"
(7.94mm)-
dia. connector)
Fig. 16
Fig. 17