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Oil Supply Line & Filter Connections
One-Pipe Systems
CAUTION
Do not install the bypass plug into the pump on one-
pipe systems.
The burner is shipped with a single-stage fuel pump set for
one-pipe operation. For one-pipe systems, the oil supply
pipe is connected to the inlet tap on the pump. A one-pipe
system should only be used where there is gravity oil flow
to the pump or there is no more than 8 ft. of vertical lift (or 6
in. Hg) from the oil tank to the fuel pump.
1 - Connect the inlet pipe to the pump inlet. Start the burner.
2 - Turn the bleed valve one turn counterclockwise.
3 - Bleed the unit until all air bubbles disappear.
NOTE - Hurried bleeding will prevent the unit from op
erating properly.
4 - If necessary, put GeniSys
t
primary control into its
4-minute pump priming mode. Refer to table 10.
5 - Tighten the bleed valve securely.
Two-Pipe Systems
If the installation requires a two-pipe operation, install the
bypass plug included in the bag which is attached to the
pump. To convert the pump, install the bypass plug accord
ing to the provided pump instructions. Notice in the two‐
pipe system the return pipe must terminate in the tank 3”
(76 mm) to 4” (102 mm) above the supply inlet. Ensure the
return pipe terminates at the correct measurement or air
may escape into the system. This could result in loss of
prime.
NOTE- If using an outside tank in cold climates a number
one fuel or an oil treatment is strongly recommended.
1. Remove 1/4” plug from return port.
2. Insert bypass plug and tighten it (see figure 15).
3. Attach the return and inlet pipes. Start the burner. Air
bleeding is automatic.
NOTE - If a faster bleed is necessary, open the bleed
valve.
4. The return pipe must terminate 3” to 4” above the sup
ply pipe inlet (see figure 15).
NOTE - If the return pipe does not terminate where it
should, air may enter the system, and prime may be
lost.
An oil filter is required for all models.
Install filter inside
the building between the tank shut‐off valve and the burn
er. Locate filter close to burner for easy maintenance.
Table 6 lists the filters for the SLO185UFV furnace.
Table 6
Oil Filters
Cat. No.
10 micron filter (no mounting bracket)
81P89
10 micron filter (mounting bracket)
53P92
10 micron replacement cartridge for filter, 45 gph
53P93
Filter restriction indicator gauge
53P90
Consult burner manufacturer's instructions packaged with
unit for further details concerning oil supply pipe connec
tions.
Leak Check
After oil piping is completed, carefully check all piping con
nections (factory and field) for oil leaks.
Oil Pipe Heater (Optional)
A heater for the oil pipe is available for applications that are
located in cold climates. The heater warms the oil pipe to
assist the initial start-up.
Electrical
All wiring must conform to the National Electric Code
(NEC), or Canadian Electric Code (CEC) and any local
codes. Refer to figure 16 for typical unit wiring diagram.
See figures and for field wiring. Refer to figure 20 for termi
nal designations on blower control.
1 - Refer to appliance rating plate for proper fuse size.
2 - Install room thermostat and make wire connections to
the fan control board. Avoid installing thermostat on an
outside wall or where it can be affected by radiant heat.
Set the adjustable heat anticipator on thermostat ac
cording to the wiring diagram sticker provided on unit.
3 - Install a separate fused disconnect switch near unit so
power can be shut off for servicing.
4 - Complete line voltage wiring from disconnect switch
near unit to make‐up box.
NOTE - An equipment ground screw is provided. Refer
to unit wiring diagram. Ground unit using a suitable
ground wire.
5 - A 24V dehumidistat can be connected to the reverse-
acting HUM terminal on the A54 blower control. See
figure 20.
WARNING
Electric Shock Hazard. Can cause
injury or death. Unit must be properly
grounded in accordance with national
and local codes.
WARNING
Run 24V Class II wiring only through specified low
voltage opening. Run line voltage wiring only
through specified high voltage opening. Do not
combine voltage in one opening.
