Control Circuit Board; Room Temperature Sensor; Fuel Sump (Fuel Constant Level Valve) - Toyotomi Laser 300 Service Manual

L A S E R
Section 1
1-15 Fuel Pump
The fuel pump is mounted on top of the fuel sump. The
pump assembly consists of the pump solenoid and the
control circuit.
Laser 300: 20470219 Laser 530: 20470319
Laser 560: 20470419 Laser 730: 20470619

1-16 Control Circuit Board

The control circuit board provides safety timings,
controls relays and provides clock and thermostat
functions for the Laser Heater
Laser 300/Laser 530: 20470212
Laser 560: 20470412 Laser 730: 20470612

1-17 Room Temperature Sensor

The room temperature sensor, which is capable
of sensing room temperatures within a range of 50°F
(10°C) to 90°F (32°C), can be wall mounted.
Approx. 8 feet (2.5 m) of wire is supplied with the
sensor to facilitate wall mounting to a favorable
location. You can also use speaker wire to extend
the mounting location up to 20 feet (6m).
Laser 300/Laser 530/Laser 560/Laser 730: 20478373
1-18 Fuel Sump
(Fuel Constant Level Valve)
The constant level valve has an automatic shutoff safety
m e c h a n i s m t h a t p re v e n t s f u e l f ro m f l o o d i n g o r
overflowing from the fuel sump.
A manual reset button allows the valve to resume
operation after the heater has been moved.
Figure 1-2 FUEL SUMP (FUEL CONSTANT LEVEL VALVE) (Part #20470234)
H E A T I N G
Fuel enters the constant level valve through an inlet at
the bottom. As the level of fuel rises, it passes through a
fuel inlet strainer which removes most particles and
foreign matter from the fuel and then it flows up through
an open inlet valve and enters the tank. See Fig. 1-2.
Laser 300/Laser 530/Laser 560/Laser 730: 20470234
S Y S T E M S
IMPORTANT:
Within the valve, a float mechanism
controls the level of fuel in the sump.
As the fuel level drops, the float drops
down to increase the inlet valve
opening to admit more fuel into the
sump. When the fuel level reaches its
maximum volume, the float rises to
shut the valve.
In the event that fuel within the sump
rises to an abnormally high level, the
float within the sump rises. A trip
magnet pulls the float up and closes
the valve to prevent fuel from entering
into the sump.
Should a foreign substance cause the
inlet valve to stick (or prevent it from
opening), the reset button is utilized
to free the mechanism and to admit
fuel to the sump.
The fuel inlet strainer should be
cleaned or replaced periodically. Time
intervals will depend on purity and
quality of fuel.
CAUTION:
Care must be taken to prevent dust,
dirt or other debris from clogging or
blocking the inlet valve.
Description
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S E R V I C E M A N U A L