Mitsubishi Heavy Industries SRC25QA-S Technical Manual Download

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7.3.6 Recharging refrigerant in servicing

If it is necessary to charge refrigerant, charge the specified amount of refrigerant by following
these steps.
(For details, see the operation manual prepared by the equipment manufacturer.)
1) Connect the charge hose to the service opening of the outdoor unit.
2) Connect the charge hose to the vacuum pump adapter. Here, push the control valve to the

full open position.

3) Push Handle

to the full open position (ON) and turn on the power switch of the vacuum

pump. (For the time of evacuation, see the manual of the equipment manufacturer.)

4) When the pointer of the compound pressure gauge indicates -0.1MPa (-76cmHg), push

Handle

to the full close position and turn off the power switch of the vacuum pump.

Keep the status for 1~2 minutes and ensure the pointer of the compound pressure gauge has
not turned back,

5) According to the steps described in 7.3.2(2) (Pages 119-120), use the electronic loadcell

scale to charge liquid refrigerant.

7.4 Refrigerant recovery
7.4.1 Recovery procedure

The following is the general procedure for recovering refrigerant. The recovery procedure
varies depending on the type of refrigerant recovery device. The connection and disposal
methods for different types of refrigerant recovery device may be different. Therefore, see the

user’s manual, etc. of the various equipment to learn the detailed operation information.

(1) Check before the recovery procedure
a) Check the refrigerant recovery device

①

Gas leakage (Servicing is required when there is any failure.)

②

Oil extractor (for discharging residual oil)

③

Weighing function, excessive charging prevention function (floating switch), moisture

indicator, dryer and other ancillary functions of the recovery device (to be adjusted or
replaced when necessary).

④

Circuit

      b) Check the accessories to the refrigerant recovery device.
(2) Preparation for the recovery procedure
      a) Installing the refrigerant recovery device
          The device should be installed in the place meeting the following requirements as far as

possible.

①

Ambient temperature above 0

℃

and below 40

℃

②

Flat, dry floor.

③

A position as near the air conditioner as possible.

      b) Preparing a recovery cylinder
          Use a compliant recovery cylinder suitable for recovering refrigerant.
      c) Connecting to the power supply
      d) Preparing the air conditioner for refrigerant recovery

①

If the air conditioner from which refrigerant is to be recovered can operate, evacuate the

appliance to store the refrigerant in the outdoor unit (condenser side).

● Evacuate the air conditioner after confirming the specifications of the air conditioner

from which refrigerant is to be recovered.

②

If there are any blocking components, such as EEV, etc., please fully open such

components.

(3) Connecting the refrigerant recovery device
a) Connect the air conditioner from which refrigerant is to be recovered to the refrigerant

recovery device.

①

With service opening (recovery port):