Bedienungsanleitung Mitsubishi SKM20ZG-S (Seite 141 von 144) (Englisch)

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8.3.6 Refrigerant recharging at servicing

When it becomes necessary to recharge refrigerant, charge the specified amount of new refrigerant according to the following

steps.

(For details, see the instruction manual prepared by the equipment manufacturer)

1) Connect the charge hose to the outdoor unit’s service port.

2) Connect the charge hose to the vacuum pump adapter. At this time, keep the control valves in the fully opened position.

3) Place the handle Lo in the fully opened position, and turn ON the vacuum pump’s power source. (For the evacuating time, refer

to the equipment manufacturer’s manual)

4) When the compound gauge’s pointer has indicated -0.1 MPa (-76 cmHg), place the handle Lo in the fully closed position, and

turn OFF the vacuum pump’s power source. Keep this state for 1 ~ 2 minutes, and ascertain that the compound gauge’s pointer

does not return.

5) Charge liquid refrigerant by using the electronic balance according to the steps described in Section 8.3.2 (2) (pages136, 137).

8.4 Refrigerant recovery

8.4.1 Recovering procedures

The following procedures for refrigerant recovery represent general procedures, and they may differ between actual cases depend-

ing upon the type of refrigerant recovering equipment. The connecting and handling methods for different type of refrigerant

recovering equipment may also differ. So, ascertain the details by referring to the respective instruction manuals, etc.

(1) Checks prior to recovering procedures

a) Checking the refrigerant recovering equipment

1 Gas leakage [If there is any malfunction, repair it].

2 Oil separator [Drain the residual oil].

3 Recovering equipment weighing function, overcharge preventing function (float switch), moisture indicator, drier and

other accessory functions [should be adjusted or replaced where necessary].

4 Electrical circuit

b) Checking the accessories to the refrigerant recovering equipment

(2) Preparations for recovering procedures

a) Installation of refrigerant recovering equipment

Install the equipment in a place which satisfies the following requirements as much as possible.

1 Ambient temperature is higher than 0°C and lower than 40°C.

2 A flat and dry floor.

3 A place as close to the air conditioner as possible.

b) Preparation of recovering cylinder

A recovering cylinder should be such that it does not go against prohibitions, and is suitable for refrigerant recovered.

c) Connect to the power source

d) Preparations for air conditioner subjected to refrigerant recovery

1 When it is possible to run the air conditioner subjected to refrigerant recovery, perform pump down operation so that

refrigerant is contained in the outdoor unit (condenser side).

• Carry out the pump down operation after confirming the specification of the air conditioner subjected to refrigerant

recovery.

2 If there is any clogging part (ex. the electronic expansion valve, etc.), fully open such part.

(3) Connection of refrigerant recovering equipment

a) Connect the air conditioner subjected to refrigerant recovery to the refrigerant recovering equipment.

1 When there is a service port (port for recovery):

Make connection to the service port (port for recovery) by using a gauge manifold and charge hose.

2 When there is no service port (port for recovery):

Make connection in a manner similar to 1 above by using a piercing valve.

b) Connect the refrigerant recovering equipment to the recovering cylinder.

Recovering cylinder

Gauge manifold

(Intake

port)

(Discharge

port)

Refrigerant

recovering

equipment

Air conditioner

subjected to

recovery

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