McQuay M5LCX Spezifikationen PDF herunterladen (Seite 36)

11. VACUUMING AND CHARGING

PURGING THE PIPING AND THE INDOOR UNIT

Except for the outdoor unit which is pre-charged with

refrigerant, the indoor unit and the refrigerant

connection pipes must be air-purged because the

air containing moisture that remains in the refrigerant

cycle may cause malfunction of the compressor.

• Remove the caps from the valve and the service

port.

• Connect the center of the charging gauge to

the vacuum pump.

• Connect the charging gauge to the service port

of the 3-way valve.

• Start the vacuum pump. Evacuate for

approximately 30 minutes. The evacuation time

varies with different vacuum pump capacity.

Confirm that the charging gauge needle has

moved towards -760mmHg.

Caution

• If the gauge needle does not move to -

760mmHg, be sure to check for gas leaks (using

the refrigerant detector) at flare type connection

of the indoor and outdoor unit and repair the

leak before proceeding to the next step.

• Close the valve of the charging gauge and stop

the vacuum pump.

• On the outdoor unit, open the suction valve (3

way) and liquid valve (2 way) (in anti-clockwise

direction) with 4mm key for hexagon sacked

screw.

ADDITIONAL CHARGE

The refrigerant is pre-charged in the outdoor unit. If

the piping length is less than 7.62m (25ft), then addi-

tional charge after vacuuming is not necessary. If the

piping length is more than 7.62m (25ft), then use the

additional charge value as indicated in the table.

CHARGE OPERATION

This operation must be done by using a gas cylinder

and a precise weighing machine. The additional

charge is toppedup into the outdoor unit using the

suction valve via the service port.

• Remove the service port cap.

• Connect the low pressure side of the charging

gauge to the suction service port center of the

cylinder tank and close the high pressure side

of the gauge. Purge the air from the service

hose.

• Start the air conditioner unit.

• Open the gas cylinder and low pressure charg-

ing valve.

• When the required refrigerant quantity is

pumped into the unit, close the low pressure

side and the gas cylinder valve.

• Disconnect the service hose from service port.

Put back the service port cap.

Additional charge per meter

The additional refrigerant charge amount

recommended is a guideline for long piping

application. The actual charge required may be

different from the guideline due to different application

and variation in site condition.

MODEL R410A

M5WMX 010/015/020/025 GR 19.5 g/m

1 2 ... 31 32 33 34 35 36 37 38 39 40 41 ... 50 51

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