TST-019 MRTALPCH CHANNEL
– Rev. 2016-310
Page 10 of 20
If, during the test, the pump cycles, the indication
is that the vacuum switch or the hose connections
between the solenoid and the vacuum switch are
the cause of the leak. Note, if the pump does
begin to run, it will not shut off with the ball valve
closed.
Check the hoses that connect the vacuum
switch to the pump solenoid.
Note, there are two hoses used: one (
11A
) from
the solenoid assembly to the control box external
connection and one (
11B
) from the control box
internal connection to the vacuum switch (
11C
)
See
FIGURE 11
.
26) Remove the ball valve. Disconnect the hoses
from the push-in fittings and cut approximately
1/8" [3 mm] from the ends of each hose. Check
that the hose connection to the vacuum switch is
secure; if it pulls off easily, recut this hose end as
well. Reattach the hose (
12A
) from the pump
solenoid to the control box. Attach the other hose
(
12B
) to the end of the ball valve with the vacuum
gauge. Using an additional piece of hose, attach
the other end of the ball valve to the inside box
connection. See
FIGURE 12
.
27) With the ball valve in the open position (handle in
line with the valve), switch the power on
( )
, and
activate the vacuum generating system by pressing the apply
( )
push button.
28) Close the ball valve (turn handle perpendicular to the valve) and switch the power off
( )
.
If the vacuum level, as shown on the ball valve’s vacuum gauge, starts and continues to
drop, the indication is that the vacuum switch leaks. Check the hose connection to the
vacuum switch and, if it is easily removed, replace the hose and repeat the test to see if the
leak stops. If the hose connection appears and feels secure to the fitting, replace the
vacuum switch.
If the vacuum level, as shown on the ball valve’s vacuum gauge, holds steady and does not
drop, the indication is that the leak exists in either the hose used to connect the vacuum
switch to the pump solenoid or the connection to the push-in fittings. Replace the hose to
the pump solenoid.
29) Repeating the test shown in step 15, where the gauge end of the ball valve was connected
directly to the pump solenoid’s 45° fitting (
FIGURE 8
), if the vacuum level, as shown on the ball
valve’s vacuum gauge, holds steady and does not drop, this verifies that this section of the
pump/control box assembly no longer leaks.
FIGURE 11
11B
11C
11A
FIGURE 12
12A
12B
