Sanyo CG1411 User Manual download pdf (Page 71)

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13-4-2. Connect the vacuum pump and a manifold valve as shown Fig. 1. Confirm that all connections are cor-

rectly made.

In order to withstand negative suction pressure during evacuation, the manifold valve should be

equipped with a Hi/Lo compound gauge with a minimum scale reading of –76 cmHg.

13-4-3. Install (first by hand-tightening, then securely with a wrench) flare nuts and bonnets at service valves in

the refrigeration circuit where evacuation will take place. This process is highly important to completely

evacuate the system.

13-4-4. Check that the BLK/WHT connector is properly attached. (Fig. 1)

13-4-5. Turn the disconnect switch ON (if it has been OFF) to open the 2 solenoid valves (SV1 and SV2). (Fig. 2)

13-4-6. With both the “Lo” and “Hi” knobs of the manifold valve open, run the vacuum pump. The operation time

varies with the capacity of the pump. (Run the pump at least 30 minutes.) Evacuation is successful if

the vacuum gauge reading remains at –75 cmHg or more for at least 10 seconds after closing both the

“Lo” and “Hi” knobs of the manifold valve.

13-4-7. With the vacuum pump still running, turn both the narrow and wide service valves all the way in to close

the valves (position – b – in Fig. 3). Then stop the pump.

13-4-8. After removing the vacuum hoses from the service valves, replace the flare nuts and bonnets on the

valves. The refrigerant circuit is now ready for charging.

13-5. Refrigerant Charging

13-5-1. After evacuation is completed, charge the circuit with the proper amount of refrigerant.

The proper amount of refrigerant is specified on the nameplate of the outdoor unit and in Section

“2-1. Unit Specifications” in the service manual.

13-5-2. Use a hose to connect the narrow tube service valve to the

liquid port of the charging cylinder. (Fig. 4)

13-5-3. Purge air from the hose. Do this by opening the charging

cylinder valve, then slightly loosening the connection to the

narrow tube service valve. Wait a few moments, then

retighten the connection.

13-5-4. With a hex wrench, open the service valve little by little to

let liquid refrigerant enter the circuit. (Fig. 4)

Write down the gradation levels on the charging cylinder

before and after the charging. This allows you to calculate

the charging volume.

NOTE

Charging

volume

Gradation

level before

charging

Gradation

level after

charging

= –

Outdoor unit

Charging cylinder

Open

Fig. 4

1 2 ... 66 67 68 69 70 71 72 73 74 75 76 ... 99 100

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Sanyo CG1411 User Manual Page 71

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