Evacuation

1. Connect service unit to the system, extract any pressure still present.





2. Switch on vacuum pump (turn main switch to left).
3. Open shut-off valves for low pressure (4), high pressure (5), torr meter (6) and vacuum pump (7).
4. Leave vacuum pump switched on for at least 15 minutes.
5. Close shut-off valves 6 and 7 at a pressure of approx. 0.1 bar (absolute).
6. Switch off vacuum pump.

NOTE: If the vacuum cannot be attained or can be reached only after a very long time or if the pressure increases over 0.2 bar (absolute) approx. 10 minutes after the pump is switched off, there is a leak in the circuit and this must be sealed.