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Mini VRF SYSTEM

Outdoor Unit Repair Procedures

6. Charging Compressor Oil

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.

Do this operation quickly because compressor oil easily absorbs moisture from the
air.

CAUTION

• 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).

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 the tube.

Upper valve

Lower valve

Vacuum pump

Manifold gauge

Oil

Close Open

Fig. 7

2WAY SYSTEM

Outdoor Unit Repair Procedures

7. Charging Compressor Oil

Next, follow the instructions in “3-2-1. 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.

SM830244-00_2WAY_7-Series.indb 22

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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*

(No connection)

Open

(Connect to

refrigerant

recovery tank)

Open

Close after

approx. 60

seconds

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.

(3)

Lower valve

Manifold gauge

(1)

DPR

(2)

Upper valve

Connect from here to
refrigerant recovery unit

Fig. 8

High-pressure outlet port
(for ø7.94mm-dia connector)

Liquid tube service port
(for ø7.94mm-dia connector)

Gas tube service port
(for ø7.94mm-dia connector)