Pressure testing
Use
Dry Nitrogen
1.
Remove the valve caps on
the liquid valve and gas valve
and the nut of refrigerant port
2.
Connect the charging hose
of manifold to the refrigerant
port, and the other to the
nitrogen tank regulator.
3. (System should hold 550
Psig for one hour.)
Begin with-
a. 150 psig for 5 min.
b. 300 psig for 15 min.
c. 550 psig for 1 hour.
4. Test all connections with
bubble solution.
5. If no leaks are found proceed to vacuum steps below.
28
liquid valve
gas valve
refrigerant charging
port
cap of refrigerant
charging port
vacuum pump
Manifold gauge
valve cap
Lo
Hi
Allen/spanner
open
close
