McQuay MCM Especificações descarregar pdf (Página 73)

(5) 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 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).

CAUTION FOR R407C

R407C must be charged as liquid. Usually R407C cylinder is equipped with a dip-pipe for liquid withdrawal. If

there is no dip-pipe, the cylinder should be inverted so as to withdraw liquid R407C from the valve.

CAUTION FOR R407C

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 R407C according to the amount recommended in the specification.

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McQuay MCM Especificações Página 73