McQuay MWM09J Manual page 19

Application Information
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).
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
Outdoor
Additional Charge (g/m)
R410A
Indoor
Outdoor
Additional Charge [g/m]
17
Filter Dryer
(Mclecular-Sieve Type
MWM09/15J MWM09/15JR
MLC09/15C MLC09/15CR
16 23
M5WM10/15J
M5LC10/15C
9
MWM20J MWM20JR
MLC20C MLC20CR
15
M5WM10/15JR M5WM20/25J
M5LC10/15CR M5LC20/25C
16
MWM25J
MLC25C
22 39
M5WM20/25JR
M5LC20/25CR
11
MWM-J_(ii)
MWM25JR
MLC25CR
55
16