Repair Section
82
(3) Checking vacuum
1) Leave the high-pressure valve and the low-
pressure valve of the gauge manifold closed for 5
minutes or more, and confirm that the gauge
pointer does not return to zero.
2) If the gauge pointer returns gradually to zero
there is a leak somewhere in the system (this
could also include gauge manifold). Perform a
leak check according to the procedure indicated
in the next step. Once the leak has been found
and repaired, evacuate the system once more to
confirm that the system holds vacuum.
I003203
Return
Pipe Brazing
Leave valves closed for 5
minutes or more. Pointer of
pressure gauge returning to
zero indicates there is a leak.
LO
Closed
HI
Closed
Valve Setting
Pressure Gauge
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