OMAS Air-Fi AFT7 Installer And User Instruction Manual page 18

2.10 VACUUM AND FILLING
OPERATION
Vacuum and filling of the circuit
The air-conditioner must be switched off.
- See Fig.(1):
1. Valves plug.
2. Coolant cylinder valve.
3. Pin valve.
4. Vacuum line.
5. Connection pipe.
6. 3-way valve.
7. Vacuum pump.
8. Manometers group.
B Cooling tap.
C High pressure valve.
- Check the 2-way and 3-way valves
locks are closed Fig.(2)
- Take away the plug from the valve n°1
on the gas line coupling.
- Connect the vacuum line n°4 coming
from the manometers group n°8.
- Empty the installation, until the nominal
pressure of 0.3mBar is reached.
- Close the tap on the manometers group
n° 8 connected to the vacuum pump n°
7 and switch it off.
- Take away the plugs on the taps n°2
Fig.(2) and open the taps with the allen
spanner and let the cooling gas
contained in the outdoor unit circulating
Fig.(3).
- Screw and tighten the plugs n°2 on the
taps Fig.(2).
- Take away the vacuum line from the
valve n°3 and screw and tighten the
relative plug n°1.
Check with the leaking tester there are no
gas cooling leakages, particularly in
proximity of the couplings.
Check the correct operation of the air-
conditioner
Check the operating pressure through the
3-ways valve with the indoor unit set at the
following conditions :
Cooling mode;
High ventilation speed.
The correct pressure must be between 8
and 9 kg/cm2, with external temperature
more than 27°C.
ENGLISH -17-