Evacuating System

NOTE: Whenever opened (exposed to atmospheric air), air conditioning system must be evacuated by using a vacuum pump. The A/C system should be attached with a manifold gauge set, and should be evacuated for approx. 15 minutes.

CAUTION: Do not evacuate before recovering refrigerant in system.

1. Connect high and low charging hoses of manifold gauge set respectively as follows:
High charging hose: High pressure service valve
Low charging hose: Low pressure service valve

2. Attach center charging hose of manifold gauge set to vacuum pump.
3. Operate vacuum pump, and then open suction-side valve (Lo) of manifold gauge set. If there is no blockage in system, there will be an indication on high pressure gauge. When this occurs, open the other-side valve (Hi) of the set.
4. Approx. 10 minutes later, low pressure gauge should show a vacuum lower than 760 mm.Hg providing no leakage exists.

Note: If the system does not show a vacuum below 760 mm.Hg, close both valves, stop vacuum pump and watch movement of low pressure gauge. Increase in the gauge reading suggests existence of leakage. In this case, repair the system before continuing its evacuation.
If the gauge shows a stable reading (suggesting no leakage), continue evacuation.

5. Evacuation should be carried out for a total of at least 15 minutes.
6. Continue evacuation until low pressure gauge indicates a vacuum less than 760 mm.Hg, and then close both valves.
7. Stop vacuum pump. Disconnect center charging hose from pump inlet. Now, the system is ready for charging refrigerant.