TM 5-3895-371-10
g.
Air pressure should be sufficient to slightly raise air relief valve. Excess engine speed will raise relief valve
too much, causing excessive pressure. Do not Increase weights on air relief valve (29, fig. 1-1, sheet 2)
or wire weights down.
h.
Fuel pressure should not be excessive. High fuel pressure will make needle valve adjustment more
sensitive. Recommended pressure is 10-15 psi. Pressure is determined by pressure relief valve located
in return line (5, fig. 2-5). An adjusting screw and locknut are inside dome-shaped cap. Unscrew cap,
loosen locknut, and turn adjusting screw to change the fuel pressure. Turning clockwise increases
pressure, turning counterclockwise decreases pressure. Tighten locknut and replace cap after making
adjustment.
i.
Do not light burners unless you are sure flues are covered at least 6 in the full length of tank. A visual
inspection through manhole cover is recommended. With this design of "High-Low" flues, it is necessary
to cover only the lower flue with 6 in of material when using the lower (o, inside) burner only.
j.
Open covers on heat exhaust stacks
WARNING
If burner goes out, turn off fuel valve immediately and do not attempt to relight until gas is exhausted from
flues.
k.
To light burners, first turn air butterfly valves to No. 1 or No. 2 open position, light torch and hold under
burner tip. Quickly open needle valve about one-half turn. Burner should ignite immediately. If it does
not, turn off needle valve and wait until gas is exhausted from flues, then try again. The correct opening of
the needle valve is determined by fuel pressure. Experience is the only way of determining the amount for
your particular unit. Flame at first will be yellow and smoky. Adjust the fuel valve so that flame is bright
orange with slight smoke in exhaust. More fuel will be needed as flues and tank contents heat up. Keep
opening fuel adjustments for slight smoke in exhaust
l.
For larger flame, increase air butterfly valve opening and fuel valve in equal increments, always keeping
mix that will give slight smoke to exhaust.
m.
Nozzle of burner is adjustable for amount of secondary air desired. Normally the secondary air is in the
full open position. Light burner and turn this nozzle until you secure the type of flame you desire
WARNING
Do not leave burners unattended. Do not heat bitumen over maximum spraying temperature recommended by
supplier.
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