McQuay MWM Specifications download pdf (Page 19)

Application Information MWM-J_(ii)

Vacuuming and Charging

The pre-charged outdoor unit does not need any vacuuming or charging. However once it is connected, the

connecting pipe line and the indoor unit 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).

Filter Dryer

(Mclecular-Sieve Type

Note : R22 - Nil

R410A - Nil

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

Additional Charge

• The refrigerant gas is charged in the outdoor unit and, if the piping length is 7.6m, additional charge of the

refrigerant after vacuuming is not necessary.

• When the piping length is more than 7.6m, additional refrigerant charge (g) per additional 1m length as

tabulated:

R22

Indoor MWM09/15J MWM09/15JR MWM20J MWM20JR MWM25J MWM25JR

Outdoor MLC09/15C MLC09/15CR MLC20C MLC20CR MLC25C MLC25CR

Additional Charge (g/m) 16 23 15 22 39 55

R410A

Indoor M5WM10/15J M5WM10/15JR M5WM20/25J M5WM20/25JR

Outdoor M5LC10/15C M5LC10/15CR M5LC20/25C M5LC20/25CR

Additional Charge [g/m] 9 16 11 16

1 2 ... 14 15 16 17 18 19 20 21 22 23 24 ... 89 90

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McQuay MWM Specifications Page 19