Vacuuming And Charging Method - McQuay MWSC 010 Series Manual

Vacuuming And Charging Method

Purging the piping and the indoor unit
The outdoor unit is equipped by two 3-way refrigerating connecting valves. The suction valve is the larger one
whereas the smaller one is the liquid valve. Both valves are supplied with service port valve for connection to a
manometer.
ó Remove the caps from the valve and the service port.
ó Connect the center manifold gauge to the vacuum pump.
ó Connect the manifold gauge to the service port of the 3-way valve.
ó Start the vacuum pump. Evacuate for approximately one hour (evacuation time varies with pump capacity).
Confi rm that the manifold gauge needle has moved towards –30inHg (-76cmHg).
ó Close the manifold valve and stop the vacuum pump.
ó On the outdoor unit, open the suction valve and
ó liquid valve (in anti-clockwise direction) with 4mm key for hexagon sacked screw.
ó The air conditioner unit is now ready for start.
ó Start the unit and run it for 10 to 15 minutes. The low pressure valve reading must be within the recommended
value range as shown in the table.
ó If the reading is within the indicated value range, the unit is running in good condition.
ó If the reading is beyond the indicated value range, the refrigerant circuit has a leak. Check and seal the leak. Top
up the charge if necessary.
ó If the reading is close to the value 0, the refrigerant circuit must be evacuated (by using vacuum pump) and be
charged (with R22) again.
MODEL
10
15
20
30
50
ó Within the value
ó Lower than the value
ó Too low ( ̃ zero)
OUTDOOR UNIT
GAS VALVE
refrigerant cycle normal.
ó
refrigerant cycle leaks. Check, repair and top-up.
ó
need evacuation and charge
ó
REFRIGERANT PIPING
LOW SIDE
PRESSURE GAUGE
LIQUID VALVE
MANIFOLD
Indoor 27 °C /Outdoor 35 °C
kgf/cm2
4.5 ~ 5.4
4.5 ~ 5.4
4.5 ~ 5.6
4.9 ~ 5.3
4.9 ~ 5.6
INDOOR UNIT
HIGH SIDE
PRESSURE GAUGE
FLEXIBLE HOSE
Page 42
Psi (=lbf/in2)
64.0 ~ 76.8
64.0 ~ 76.8
64.0 ~ 79.6
69.7 ~ 75.4
69.7 ~ 79.6
VACUUM PUMP