Page 128 - Webster Service Manual

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OPEN LOOP SYSTEM
To insure a flooded supply line, a standpipe before the
junction of the supply line with the return line is required.
The standpipe on the supply line must be at least three
feet higher than any point in the supply line system
before joining the return line. Use of a W ebster 48598
vacuum breaker is recommended.
Figure 4. Central Supply Systems tor Mobile Homes
GENERAL CONSIDERATIONS
PORTING CONNECTIONS
The OSV
®
valve is installed in the supply line between
the tank and burner. Its location depends on the appli-
cation (see sections A & B). The OSV
®
IN” port is con-
nected to the tank side. The OSV
®
OUT” port is con-
nected to the burner side of the line. Non hardening
pipe dope is recommended for use on the fitting
threads. Do not use teflon tape, as it may void all war-
ranties.
MOUNTING
The OSV
®
can be mounted in any position. In those
environments where dirt or moisture is particularly a
problem, the preferred position is with the cover down.
This allows any moisture from the diaphragm area to
drain out the manual access hole.
FILTER
A dependable in-line filter is recommended between the
tank and OSV
®
to help assure optimum valve perform-
ance. Dirt on the valve s eat area could prevent the
valve from sealing tightly.
PRIMING
For priming purposes, the OSV
®
can be manually oper-
ated by inserting a paper clip or stif f wire through the
manual access hole, and depressing the diaphragm
plate. Remove the wire immediately if oil appears at the
fuel unit vent, the burner fires up, or there is any sign of
oil at the burner fuel unit.
CHECK LOCAL CODES
The installer is responsible for complying with all appli-
cable codes. Typical installation diagrams are shown for
reference only.