Nordyne Downflow Direct Vent Forced Air Gas Oil Furnaces SERIES M1B - Manual (Page 17)

17
Figure 27. Typical Oil Piping for Above Ground (Single-Line) Supply
If fuel pump fails to lift oil, check for air
port plug and repeat priming procedure.
leaks and tighten all fuel fittings. Re-
prime fuel pump by injecting fuel oil into
optional (top) return port. Replace return
Top of Tank
8 ft.
Shut-off
Valve
Optional
Fuel
Filter
Alternate
Fuel Line
Entry
Control
Panel
Oil
Furnace
On-Off-Fan
Switch
Floor Cavity
Oil-Gun
Burner
Floor
Flue Gas
Sampling
Hole
Drain
End of Oil Supply Line
3" to 5" Above Bottom Drain
Guide
Pipe
Gauge
Vent with cap
2" Duplex
Bushing
2" Fill
3/8" Oil Supply Line
NOTE: Additional venting may be
required if tank is filled rapidly.
4 GPH 100-150 PSI 3450 RPM
3 GPH 150-200 PSI 3450 RPM
VALVE ON DELAY
NO. 2 & LIGHTER FUEL
USE ONLY WITH
INLET BY-PASS
Exclusively for Beckett Made by Suntec
INLET
NO. 2 FUEL
A2EA-6520
Beckett
Nozzle Port
3/16 Flare Fitting
Bypass Solenoid Valve
Cordset
Inlet Port
1/4 NPTF
Bleed & Gauge Port
Pressure Adjustment
Screw
Inlet Port
1/4 NPTF
Return Port - Install 1/6” Bypass Pipe
Plug for 2-pipe System Only.
(Use 5/32” Allen Wrench)
For L.P. gas, pressure to the gas valve must be
more than 11” W.C. but not more than 13” W.C.
Pressure is reduced to 10” W.C. by the pressure
regulator in the gas valve.
CAUTION:
Furnace conversion must be per-
formed by a qualifi ed technician.
Improper conversion can cause
unsafe operation, explosion, fi re
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 satisfi ed, where
they apply, for an approved installation.
• Use a tank capacity suitable for the application
with a weatherproof, capped fi ll opening and
a shielded vent to let in air as fuel is used.
• The inside of the tank must be clean before
fi lling. All water, rust, sediment, and debris
must be fl ushed 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 fi lled, 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 fi lter 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 fi tting of the tank. See Figure 27.
3. Insert one end of the tubing through the duplex
bushing until it is three to fi ve 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 fl ow.