Page 125 - Webster Service Manual

120
INSTALLATION
The OSV
®
should be mounted on the supply line as
close to the tank as possible.
CAUTION:
DO NOT mount the OSV
®
more than three
feet above the fuel unit inlet or more than three feet
above the lowest point in the fuel line connecting the
OSV
®
to the burner fuel unit.
See Figures 1 & 2 below.
Figure 2. Mobile Home Gravity System
Failure to observe the above caution will compromise
valve action and may result in tank siphoning action in
the event of a line failure between tank and burner .
TROUBLESHOOTING
The OSV
®
valve will not open during fuel unit operation
if there is any air leak in the system between OSV
®
and
burner that prevents development of the operational
vacuum required. (See Table 1).
If there is no oil flow to burner or prime is lost
A. Check to see if OSV
®
valve is stopping oil flow. Turn
on burner and manually depress OSV
®
diaphragm
plate with paper clip to see if burner fires up.