16
Method 2 (Use a vacuum pump to remove non-condensable from A/H and pipe
work.)
1. Tighten all flare nut connections on both Con/set & A/H.
2. Remove schrader valve caps and connect vac. pump hoses, preferably to
both valves. (Make sure valve depressors are set OK.)
3. If both hoses are fitted, evacuate for 10 mins. If only one is fitted then
evacuate for 15 mins.
4. Check that pump retains a high vacuum.
5. Remove the stem caps, then isolate the vac. pump, and then turn on both
valve stems. Fully backseat both & refit caps.
6. Disconnect vacc. pump hoses & replace caps.
7. Check for leaks.
Figure 16
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