Balcar R410A service manual Open valve fully, Gas leak check, Use a vacuum pump, 111

RAV-SM560, 561, 800, 801BT-E

RAV-SM1101, 1401BT-E

7 EVACUATING

AIR PURGE

Evacuate the air in the connecting pipes and in the indoor unit using vacuum pump.

Do not use the refrigerant in the outdoor unit. For details, see the manual of vacuum pump.

Use a vacuum pump

Be sure to use a vacuum pump with counter-flow prevention function so that inside oil of the pump does not flow backward into pipes of the air conditioner when the pump stops.

1.Connect the charge hose from the manifold valve to the service port of the gas side packed valve.

2.Connect the charge hose to the port of vacuum pump.

3.Open fully the low pressure side handle of the gauge manifold valve.

4.Operate the vacuum pump to start evacuating.

Perform evacuating for about 35 minutes if the piping length is 30 meters total for model SM560 and 50 meters for model SM800, SM1100, SM1400 (assuming a pump capacity of 27 liters per minute.) Then confirm that the compound pressure gauge reading is –101 kPa ( –76 cmHg).

5.Close the low pressure side valve handle of gauge manifold.

6.Open fully the valve stem of the packed valves (both sides of Gas and Liquid).

7.Remove the charging hose from the service port.

8.Securely tighten the caps on the packed valves.

Open valve fully

Open valves of the corresponding outdoor units fully.

Gas leak check

Using a lead detector or soap water, check there is no gas leak from pipe connecting portion or caps of the valves.

REQUIREMENT

For a leak detector, use one manufactured exclusively for HFC refrigerant (R410A, R134a, etc.)

Thermal-insulating process

Perform pipe thermal-insulating process for liquid and gas sides separately.

•For thermal insulator to pipes at gas side, use one with heat resisting temperature 120°C or higher.

•Using the attached thermal insulator, perform surely thermal insulation without gap for pipe connecting portion of the indoor unit.

REQUIREMENT

Perform surely thermal insulation process so that the naked end of pipe connecting portion of the indoor unit does not appear.

(Exposure of the pipe may cause water leak.)

Packed valve handling precautions

•Open the valve stem all the way out ; do not try to open it beyond the stopper.

•Securely tighten the valve stem cap at the torque as follows:

15.9 mm (diam.)	68 to 82 N•m (6.8 to 8.2 kgf•m)
12.7 mm (diam.)	50 to 62 N•m (5.0 to 6.2 kgf•m)
9.5 mm (diam.)	33 to 42 N•m (3.3 to 4.2 kgf•m)
6.4 mm (diam.)	14 to 18 N•m (1.4 to 1.8 kgf•m)

Hexagonal wrench is required.

Main unit

Union

Flare nut	Pipe thermal
Attached thermal insulator	insulator

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