tached, in bore of plate. Secure nozzle
plug electrode (3).
holder by engaging clamp (3) in
notches on combustor.
(2) Install the plate (4, fig. 31) on com-
(5) Insert ignition cable (7) through hole
in casing, and secure grommet (6)
(3) On Model BT400-40 heaters, insert
around cable. Connect ignition cable
nozzle holder (1) in bore of plate,
to igniter plug (5) and magneto (9).
tighten tube assembly fittings, and in-
stall clamp (3) in notches on cornbus-
tor to secure nozzle.
(4) On Model BT400-40-1 heaters, insert
nozzle holder (1), with clamp at-
Section XII. HEATER FUEL SYSTEM (BT400-40)
The heater fuel system consists or a fuel
tank mounted in the base, fuel filter, tube as-
semblies, fuel pump, fuel control box, and
85. Fuel Pump and Heater Fuel Tube
a. General The fuel pump is mounted on a
bracket to the left of the nozzle. The pump is
belt-driven by the power unit. A flexible hose
assembly delivers fuel, through the fuel filter,
to the fuel pump. During the heating cycle
fuel travels from the nozzle and secondary
bypass line. Bypass fuel is returned to the fuel
tank from the nozzle and secondary bypass
b. Pressure Test and Adjustment.
(1) Disconnect fuel pump-b-nozzle pres-
(2) Using an adapter, connect a pressure
gage with a maximum reading 200
psi in pressure tube assembly (2).
start the heater and observe pressure
gage reading. The pump should be
operating at 150 psi, plus or minus 2
(4) If the reading is not within operating
pressure tolerance, remove nut (1) and
turn ajusting screw clockwise to in-
Pressure tube assembly
crease the pressure, or counterclock-
wise to decrease pressure.
Bypass tube assembly
pressure gage and connect the pres-
Figure 33. Fuel pump, pressure test points
sure tube assembly (2).