McQuay M5WMX Especificaciones descargar pdf (Pagina 23)

Vacuuming and charging

Purging the piping and indoor unit

Except for the outdoor unit which is pre-charged with

refrigerant R22, the indoor unit and the refrigerant

connection pipes must be air-purged because the air

containing moisture that remains in the refrigerant

cycle maycause malfunction of the compressor.

• Make sure all pipes are connected securely to

the outdoor and indoor valves.

• Remove the caps from the flare valve and the

service.Take note that there are a total of two

service ports for 5MSX20A/AR, three service

ports for 5MSX25A/AR and four service ports for

5MSX30A/AR.

• Connect the center of the charging gauge to the

vacuum pump.

• Starting from the bottom 3-way valve (labeled A),

connect the charging gauge to the 3-way valve’s

service port. (The numbers of service ports

depend on the O/D unit model).

• 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.

• Proceed to the next 3-way valve and repeat the

steps above.

Caution

• If the gauge needle does not move to -

760mmHg, be ure 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 for

specific piping length. Please refer to page 1-5 for

further detail on additional charge.

Service Port

Outdoor Unit 3 ways valve

Flare nut

Refrigerant Piping

Allen key

Suction

valve

Discharge

Valve

Indoor Unit

Outdoor Unit

Liquid side

Gas side

Vacuum

pump

Open

Low

Charge operation

This operation must be done by using a gas cylinder

and aprecise weighing machine. The additional

charge is toppedupinto 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

charging 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.

Open

Suction

Valve

Discharge

Valve

Indoor Unit

Outdoor Unit

Liquid side

Gas side

Check

Valve

Low

• R410A must be charged as liquid. Usually R410A cylinder is equipped with a dip-pipe for liquid withdrawal.

If there is nodip-pipe, the cylinder should be inverted so as to withdraw liquid R410A from the valve.

• Do not top-up when servicing leak, as this will reduce the unit performance. Vacuum the unit thoroughly

and then charge the unit with fresh R410A according to the amount recommended in the specification.

Caution

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