McQuay MWM Specifications download pdf (Page 36)

9) VACUUMING AND CHARGING

• The precharged outdoor unit does not need any vacuuming or charging. However once it is connected, the

connecting pipe line and the indoor need to be vacuumed before releasing the R22/R407C/R410A from the

outdoor unit.

1) Open the service port core cap.

2) Connect pressure gauge to the service port.

3) Connect the line to vacuum pump. Open the charging manifold valve and turn the pump on. Vacuum to

–0.1 MPa (-760mmHg) or lower. (Evacuation time varies by the pump but averagely in 1 hour).

Note : R407C – Fix filter dryer

R22 - Nil

R410A - Nil

4) After evacuation, unscrew the spindle (diagram B) for the gas to run to indoor unit.

c) Connect the “Female” nut of the orifice pipe to the “Male” joint.

d) Flare another liquid pipe and connect it to the “Male”joint of the orifice pipe.

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McQuay MWM Specifications Page 36