Lanair MXB400 - Manual (Page 14)

Section 7 - Fuel Supply Pump/ Piping
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10. Install the check valve (arrow facing towards the pump) on the bottom of the pick up tube.
11. Install a vacuum gauge (included, P/N 8398) in the suction line. This gauge will indicate when service is needed on
the strainer, pump, connections, or fuel level.
12. Install fuel regulator and fuel relief valve assembly (see Fig 5). NOTE: This item comes pre-assembled from the
factory.
13. Install the 3/8" diameter copper line from the fuel relief valve to the fuel supply tank. Do not allow this line to pro-
trude into the tank more that 1”. This line should not be submerged in oil. Failure to install this line properly will
result in damage to your boiler, and will void your warranty. The use of smaller line, or rubber, plastic or hydraulic
line is unsafe and will void your warranty.
14. Install the fuel supply line from the fuel regulator/ relief valve assembly to the inlet port on the left side of the
burner using 3/8” outside diameter copper tubing. NOTE: THE MAXIMUM DISTANCE OF THIS LINE IS 25 FEET.
15. If using copper line on the suction side of the pump, use flare fittings. Compression fittings may be used on the
push side of the pump.
16. Keep the fuel supply lines 1” off any outside walls.
Fuel Relief Valve
P/N 8462
Fuel Regulator
P/N 8460
Bushing P/N 8908
Nipple P/N 8915
Tee
P/N 8909
Close Nipple
P/N 8647
3/8” x 1/4’” NPT
P/N 8939
3/8” x 1/4’” NPT
P/N 8939
FUEL LINE
TO BURNER
RETURN LINE
TO TANK
Figure 5
NOTE: This item comes pre-assembled from the factory.