10
I-OH (01-20) PN120390R7
INSTALLATION—CONTINUED
Mechanical Connections—Continued
Shutoff Valves
•
Install a readily-accessible manual shutoff valve at each point to properly control the flow of fuel in normal operation
and where required to avoid oil spillage during servicing. The valve should close against the supply. If the heater
will not be operating for an extended period of time, close the shutoff valve.
•
Where a shutoff is installed in the discharge line of an oil pump that is not an integral part of a burner, connect a
pressure relief valve into the discharge line between the pump and the shutoff valve and arrange to return surplus
oil to the supply tank or to bypass it around the pump unless the pump includes an internal bypass.
•
Any fuel oil line that incorporates a heater shall be provided with a relief valve arranged to discharge to the
return line when any valve, pump, or other device may prevent the release of excessive pressure because of the
expansion of the oil when heated.
•
Where oil is supplied to a burner that requires uniform flow by gravity feed and a constant level valve is not
incorporated in the burner assembly or the oil is not supplied by an automatic pump, install a constant level valve
in the supply line at the gravity tank or as close as practical, to ensure uniform delivery of oil to the burner. The
vent opening of the constant level valve should be connected by piping or tubing to the outside of the building
unless the constant level valve is provided with an anti-flooding device. Do not connect the vent piping or tubing
of constant level valves to tanks or tank vents.
Oil Filter
•
Install a UL-listed (US) or CSA/USC (Canada) oil filter of generous capacity between the tank shutoff valve and
the burner.
•
For ease of servicing, locate the filter and shutoff valve close to the oil burner.
Piping System Selection
Piping system selection depends on the application. The following four methods of piping fuel to an oil-fired heater
are recommended for specific installation conditions:
•
one-pipe supply with the standard single-stage burner pump
•
two-pipe supply with either the standard single-stage burner pump or an optional two-stage burner pump
•
loop and pressurized systems require an additional booster pump for oil delivery and are used when installing
more than one heater
One-Pipe Supply with Standard Single-Stage Burner Pump
•
The standard burner is equipped with a single-stage, 3,450-RPM pump with the lift capacity shown in
.
Figure 4. One-Pipe Supply System
