Gas Pump Checkout
RTHC-SVD01B-EN 55
9. To determine if the check valve (24) is leaking by, place a temper-
ature probe on each side of the check valve (24). Monitor the tem-
perature differential across the check valve (24) during the time
that the “drain” solenoid (23) is energized. If the check valve is
leaking, the temperature differential will be very small because
condensing gas will push into the evaporator. In a properly oper-
ating system, the temperature differential across the check valve
(24) during the drain cycle will be about 2-4 degrees depending
on operation conditions.
10. If step 8 shows that there is a leak, but step 9 indicates it is NOT
related to the check valve (24), the problem most likely resides in
the "fill" solenoid (22), and it should be replaced.
11. Before returning to service, make sure all valves and coils are
returned to their normal positions.
Note: If it is determined that the check valve (24) is leaking, it is recom-
mended that the entire Gas Pump assembly be replaced because the
check valve contains a teflon ball. Units with a Design Sequence of G0
and earlier have the check valve brazed in. It is very difficult to braze in
without damaging the teflon ball. Design Sequence H0 changed this to
a o-ring boss fitting and the check valve can be replaced indepen-
dently
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