Service valves and gauges:Purging hoses and manifold

Purging hoses and manifold

Having fitted the gauges to the service valves, the next step is to remove any air from the hoses and manifold. Air contains moisture and is a contaminant, and its entry to the system must be prevented.

Once the gauges have been fitted, proceed as follows:

1 Crack off the discharge service valve (turn the valve stem one turn clock- wise).

2 Open both shut-off valves on the manifold.

3 Loosen the hose connection (blue) on the suction service valve and allow the pressure to leak out slowly for one or two seconds.

4 Tighten the hose connection.

5 Close both shut-off valves on the manifold.

6 Crack off the suction service valve.