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2WAY SYSTEM
Outdoor Unit Repair Procedures
3
7. Charging Compressor Oil
2WAY SYSTEM
Outdoor Unit Repair Procedures
7. Charging Compressor Oil
Next, follow the instructions in “4-2-1. Cooling operation (for all units)” at the outdoor unit where oil will be charged,
and start cooling operation at all units. After the operating conditions were stabilized, open each valve (Hi-side
NOTE
To determine the completion of refrigerant recovery, follow the instructions that came with the refrigerant recovery unit.
When this is done, the refrigerant pressure from operation forces the oil out of the oil charge tank, and oil is charged
into the outdoor unit from the low-pressure outlet port. Occasionally close the upper valve on the top of the oil charge
tank (only this valve) and shake the tank to check the amount of remaining oil.
1. Open the valve on the high-pressure side of the manifold gauge.
2. Open the upper valve.
3. Open the lower valve.
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manifold gauge, upper valve and lower valve) in sequence as follows.
Operating valve
Hi-side
manifold
gauge
Lo-side
manifold
gauge
Upper
valve
Process
Oil
charging
Oil charge
completed
Refrigerant
recovery
(oil-charging
tank inside)
Open
Close*
Close
Close
(No connection)
Close
(No connection)
Open
(Connect to
refrigerant
recovery tank)
Open
Open
Open
Open
Close after
approx. 60
seconds
Close
Lower
valve
Completing oil-charging
To terminate the oil charging work, do as follows:
To end the charge process, first close the valve on the Hi-side manifold gauge. Then wait approximately 60
seconds in order to vaporize the refrigerant in the charge tank. Then fully close the lower valve.
Refrigerant recovery (oil-charging tank inside)
Finally, connect the refrigerant recovery unit to the Lo-side manifold gauge, shut down all indoor and outdoor units,
and then recover the remaining refrigerant in the oil-charging tank. Perform these procedures quickly and securely
so that no air can enter them. Then, charge the necessary amount of new refrigerant by referring to the “Installation
Instructions” that came with the outdoor unit.
Lower valve
Manifold gauge
Lo
Hi
DPR
Upper valve
Liquid tube service port
(for ø7.94mm-dia connector)
Low-pressure
outlet port
(for ø7.94mm-dia
connector)
High-pressure outlet port
(for ø7.94mm-dia connector)
Gas tube service port
(for ø7.94mm-dia connector)
Type 8HP / 10HP
Connect from here to
refrigerant recovery unit
Fig. 12
Lower valve
Manifold gauge
Lo
Hi
DPR
Upper valve
Clos
e
Clos
e
Liquid tube service port
(for ø7.94mm-dia connector)
Low-pressure outlet port
(for ø7.94mm-dia connector)
High-pressure outlet port
(for ø7.94mm-dia connector)
Gas tube service port
(for ø7.94mm-dia connector)
Type 18HP / 20HP
Fig. 11-d
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