ForL.Rgas,pressuretothegasvalvemustbe
morethan11"W.C.butnotmorethan13"W.C.
Pressureisreducedto10"W.C.bythepressure
regulatorinthegasvalve.
CAUTION:
Furnace conversion must be per=
formed by a qualified technician.
improper conversion can cause
unsafe operation, explosion, fire
and/or asphyxiation.
Oil Tank and Piping installation
The following procedures are recommended as
good practice. However, requirements of local
codes and ordinances, H.U.D. Manufactured
Home and Safety Standards or National Fire
Protection Association must be satisfied, where
they apply, for an approved installation.
, Use a tank capacity suitable for the application
with a weatherproof, capped fill opening and
a shielded vent to let in air as fuel is used.
, The inside of the tank must be clean before
filling. All water, rust, sediment, and debris
must be flushed out.
, A fuel or tank gauge (Figure 27) is recom-
mended for easy checking of the fuel level.
Check the gauge reading with a dipstick.
, Locate the storage tank conveniently near
the home. If the fuel tank is installed above
ground, the tank may rest 3 to 4 inches off
the ground. Fuel tanks may also be buried if
properly coated to resist corrosion. The vertical
dimension from the bottom of the fuel tank to
the fuel pump must not exceed 10 feet.
_, Keep the tank filled, especially in the summer
to reduce the accumulation of condensation.
One Line System
The one line system is highly recommended
where vertical lift, from bottom of tank to pump,
is less than eight feet (Figure 27). A single line
hookup has the advantage of lower cost and
quieter operation.
Two Line System
If a two pipe system is used or if oil is taken from
the bottom of the tank, a filter is recommended.
A two line system should only be used if vertical
lift exceeds 8 feet.
1. Install the oil feed line as outlined in steps 1 - 6
below.
2. Install the oil pump bypass plug in the bottom
return port.
3. Route the return line up through the furnace
base to the return port of the pump. Route the
other end of the line to the tank, using 3/8"
O.D. copper tubing or 1/4" pipe with the ends
capped.
4. Insert the return line through the second
opening in the duplex bushing. If the bottom
of the tank is lower than the pump intake, the
tube should be inserted three or four inches
from the tank bottom. If the bottom of the tank
is higher than the pump intake, the return line
should extend not more than 8" inside the tank.
Fuel line Hook-Up
1. Use a 3/8" O.D. copper tubing for the fuel line.
NOTE: Cap the end with tape to keep out dirt
while the line is being routed.
2. Install duplex bushing for two 3/8" lines in the
top fitting of the tank. See Figure 27.
3. Insert one end of the tubing through the duplex
bushing until it is three to five inches from the
bottom drain. Tighten the bushing.
4. Route the line where it will not incur any
damage. Make bends gradual and avoid kinks
which might restrict oil flow.
3/8" Oil Supply Line Oil
Furnace
Vent with ca 2" Duplex
Top of Tank
Shut-off
Valve
Cordset
Bypass Solenoid Valve
NozzJe Port Screw
3/16 Flare Fitting _]_- ._
_ 1/4 NPTF ,
Flue Gas ',.LJ . _
Sampling
Hole _/_,-?_ _ L_
_ E£_ Bleed & Gauge Port I]:Z';
Inlet Port • h Return Port - Install 1/5" Bypass Pipe
1/4 NPTF Plug for 2-pipe System Only.
On-Off-Fan (Use 5/32" Allen Wrench)
Drain
Oil-Gun
End of 0il Supply Line Optional Burner
3' to 5" Above Bottom Drain Fuel
Filter Floor
NOTE: Additional venting may be Floor Cavity
required if tank is filled rapidly,
If fuel pump fails to lift oil, check for air
leaks and tighten all fuel fittings Re-
optional (top) return port RepJace return
prime fuel pump by injecting fuel oil into
[port p ug and repea pr m ng procedureJ
Figure 27. Typical Oil Piping for Above Ground (Single-Line) Supply
17
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