Lanair MXB360 - Manual (Page 28)

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Section 16 - Priming the Fuel Pump
1. The fuel level in the supply tank must be above the check valve
on the pick-up tube. Fill suction line with oil.
2. Remove the bowl of the suction line strainer, and fill with clean
fuel. Replace the strainer bowl.
3. Remove the two yellow wires from the F-F terminal on the oil pri-
mary control (Fig. 17). Install a jumper wire between the F-F termi-
nals (Fig. 18).
4. Adjust the air filter/regulator on the heater to –0- PSI.
5. Remove the fuel supply line from the burner and position a con-
tainer to catch the fuel.
6. Loosen the bleeder screw on the pump one turn, and attach a
piece of 3/16” ID clear plastic tubing. The tubing should be long
enough to allow the fuel to be returned to the tank.
7. Turn the room thermostat above room temperature, or to the
“ON” position.
8. Disconnect one end of the jumper wire at the F-F terminals on
the oil primary. The fuel pump will now start.
9. Observe the clear tubing attached to the bleeder screw on the
pump. When a steady stream of fuel (no air bubbles) flows close
the bleeder screw. Remove the tubing from the bleeder screw.
10. Observe the end of the fuel supply line that is disconnected from
the burner. Allow a steady stream (no air bubbles) of fuel to flow
into the container for several minutes. This will flush any debris
from the fuel line that could potentially plug the nozzle. The vacu-
um gauge reading should not exceed 5” HG of vacuum.
11. Turn the room thermostat below room temperature or “OFF”.The fuel supply pump will now stop.
12. Reconnect the fuel supply line to the burner.
13. Remove the jumper wire from the F-F terminals on the oil primary control, reattach the yellow cad cell wires.
14. Adjust the burner air filter/regulator to 12 PSI.
15. If the fuel supply pump prime, or fuel stream has air in it (spurting, fluctuating flow) there is likely a leak in the suc-
tion side of the plumbing. Refer to section 19, Trouble Shooting. The burner should now be ready to fire.
Figure 17
Figure 18
Remove two yellow wires
Install jumper wire