19
Fuel Line Hook-Up: One Line System
The one line system is highly recommended
where vertical lift, from bottom of tank to pump,
is not more than eight feet. A single line hookup
has the advantage of costing less and giving
quieter operation.
Fuel Line Hook-Up: Two Line System
Use a two line system only if the 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. Run the return line up through the furnace
base to the return port of the pump. Run
the other end of the line to the tank, using
3/8” O.D. copper tubing or 1/4” pipe with the
ends capped, and routing the line so it stays
clean.
4. Insert the return line through the second open-
ing 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.
If a two pipe system is used or if oil is taken
from the bottom of the tank, a fi lter is recom-
mended.
Hook-Up Procedure (See Figure 27)
1. Use a 3/8” O.D. copper tubing for the fuel line.
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.
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. Run the line where it will not be subject to
damage. Also, make bends gradually and
avoid kinks which might restrict oil fl ow.
5. Open the furnace door. Connect the oil line
to the intake port on the pump. Tighten other
port plugs on the pump.
6. Be sure oil line is airtight! Air leaks can cause
the pump to lose prime and will create other
problems such as nozzle failure, odors, rum-
bling noise, and false safety shutdown.
7. Insert the short length of the copper tube
level with the bottom of the duplex bushing.
Form the tube into an inverted “U” to serve
as a vent.
How to Eliminate Air Leaks
To eliminate problems caused by air in the oil line,
all connections in the oil supply line and all plugs,
nuts, and fi ttings on the pump must be airtight.
This includes the nut that covers the pressure
adjustment. It is important that the hook-up be
done carefully and with a good fl aring tool.
Prepare the burner for priming by attaching a
clear plastic hose over the bleed port fi tting and
fully opening the pump bleed port. Use a suitable
container to collect purged oil.
To assure continuous operation, use a wire to
jump terminals T-T (or F-F) on the primary control
while burner is running. If furnace is equipped with
the Honeywell R7184 primary control, priming
oil pump procedure is as follows:
1. While the ignition is on, press, for 1/2 second
or less, and release the reset button. The
lockout time will be extended to 4 minutes.
2. If prime is not established within the 4 minutes,
the control will lock out. Press the reset button
to reset the control.
3. Repeat steps “1” and “2”, if needed, until the
pump is fully primed.
If furnace is equipped with the Beckett 7505
primary control, priming the oil pump procedure
is as follows:
1. After the burner starts, press and hold the
reset button for 15 seconds until the yellow
light turns on. This indicates that the button
has been held long enough.
2. Release the reset button. The yellow light will
turn off and the burner will start up again.
3. At burner start up, click the reset button while
the igniter is still on. This will transition the
control to a dedicated Pump Prime mode,
during which the motor, igniter and valve are
powered for four minutes. The yellow light will
be on.
4. If the prime is not established during the four
minute pump prime mode, repeat step 3 until
the pump is fully primed.
When oil fl ow is clear and free of air bubbles,
close air-bleed valve and tighten. (Time to bleed
air out will vary depending on length of oil line,
number of bends, etc.)
Fuel Oil Type
Do not use fuel oil heavier than Grade No. 2.
Grade No. 1 may be used where the oil supply
is subject to low temperatures.
