Vacuuming
Remove the valve hood, connect the fi lling mouth to the pressure capsule and vacuum pump
1.
with auxiliary pipe (see Figure 4).
Separately vacuum each indoor unit and the connecting pipe, until vacuum degree of the unit and
2.
inside the pipe is less than 46Pa, and won
ď
t rise up to 66Pa half an hour later.
Stop the vacuum pump and shut off the valve of pressure capsule.
3.
Remove the protective cap and completely open the stop valve by means of an inner hexagon
4.
spanner.
After completion of fi lling, reinstall the protective cap of the stop valve.
5.
Remove the auxiliary pipe and reinstall the valve hood on the fi lling mouth.
6.
R
410a
Detail A
See detail A
hose of high and
low pressure gauge
control wire
high pressure gauge
low pressure gauge
vacuum gauge
vacuum pump
Schematic of Vacuuming and Refrigerant Filling
Figure 4.
Notes:
Selection of vacuum pump: choose the pump whose pressure can reach below 50Pa.
•
It is forbidden to exhaust the air of the indoor unit and the pipe with refrigerant.
•
Connect the pressure gauge to the access hole of the ball valve at air side and liquid side of the
•
outdoor unit, and make the vacuum pump run more than 24h. When the absolute pressure of
vacuum degree reaches 650Pa, continue to vacuum for an hour at least.
Vacuum
Hose 2
Hose 1
Hose 3
One-way valve
Compound
pressure gauge
To indoor unit
Access valve
outdoor unit
air valve
liquid valve
Air tightness test, vacuuming and adding refrigerant
AMS-SVX01A-EN
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