L.B. White 300 Director - Manual (Page 18)

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The air pressure switch is mounted to the inside of a
small access panel at the fan end of the heater. See Fig.
20.
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Ensure the switches flexible tubes and fittings are not
blocked with dust/dir t or pinched. Tubes must be
securely connected to the pressure switch and fittings.
■
The tube fittings are located at the exterior below the fan
(See Fig. 21) and in the lower barrel of the heater near a
wiring exit hole, see Fig. 22. Ensure this fitting is
positioned as shown.
■
The tube connected to the fitting below the fan guard is
connected to the barbed connection on lower section of
the switch. The tube connected to the fitting at the lower
barrel is connected to the barb on the upper section.
AIR PRESSURE SWITCH AND TUBING
FIG. 20
FIG. 21
FIG. 22
17
1. Loosen the bolt at the top of the fuel filter
housing.
2. Remove filter from housing bowl and clean as
necessary with fresh fuel. Replace filter if
necessary.
3. Ensure filter gasket and bowl o-ring are in good
c o n d i t i o n a n d p ro p e r l y l o c a te d p r i o r to
reassembly. Tighten the bowl to the housing
securely. A defective o-ring will prevent proper
suction of fuel from the bowl.
■
The fuel bowl should start feeling warm to
touch within the first few minutes of
connecting the heater to the power supply.
■
If the element does not warm up by this
time, check element continuity. If defective,
replace complete bowl and filter assembly.
-- Heating element is not available
as a separate part.
FUEL FILTER WITH HEATING ELEMENT
O-RING
BOLT
FIG. 23
FILTER GASKET
HIGH PRESSURE
TUBE CONNECTED
TO UPPER BARB ON SWITCH.
RED WIRE TO NORMALLY OPEN
(NO +) TERMINAL ON SWITCH
WHITE WIRE TO
TERMINAL C
LOW PRESSURE FITTING
(TUBE RUNS TO LOWER
BARB ON SWITCH
HIGH PRESSURE FITTING
(TUBE CONNECTED TO
UPPER BARB ON SWITCH)