Servicing; Cleaning The Heat Exchanger And Burner; How To Replace/Attach The Burner Matts; Introduction - Toyotomi Laser 300 Service Manual

L A S E R L A S E R
Section 3
3-1

Introduction

Servicing is required when the heater is running at
proper efficiency. This section covers the possible
causes and the corrective procedures for efficiency
losses.
Signs of improper heater efficiency and performance
would be:
n A yellow, high flame.
n A whistling noise.
n Smoke from the flue pipe exhaust .
n Heavy soot and carbon build up in burner, heat
chamber and/ or heat exchanger.
n Lowered heat output.
n Failed ignition.
n Failure to maintain combustion. n
Noise from the blower motor.
Cleaning The Heat
3-2
Exchanger and Burner
Under normal running conditions, very little soot will be
formed inside the burner. A light covering of soot will not
affect the performance of the heater. Thus the heater
should not need cleaning. If a heavy soot build up
occurs, follow the outlined steps for opening and
cleaning the heater.
The burner is assembled using gaskets to maintain its
air-tightness. If these gaskets are damaged, the air may
cause soot and/or cause noise.
NOTE:
When cleaning the burner, it is recommended
to slide the heat exchanger gasket onto a
piece of cardboard. Or replace the gaskets, if
necessary, carefully remove the gaskets
because they are easily damaged.
1. Remove front panel assembly.
2. Remove top plate.
3. Remove top heat shield.
4. Remove heat exchanger.
5. Remove heat shield.
6. Remove flame rod sensor.
7. Turn burner ring counter-clockwise to remove. Burner
ring is secured by three side pins in the burner pot.
If burner ring does not turn, pull it up slightly to loosen
the spring clips.
H E A T I N G H E A T I N G
8. Use a wire brush to clean inside the heat exchanger
NOTE:
9. Remove the igniter and the fuel nozzle from the
10. The burner ring may deform and deteriorate after

How to replace/attach the burner matts;

For Laser 300
Place the edge of rectangular burner
mat (Part # 20479513) under the fuel
nozzle and have the other end be
in the center. Please refer to Fig. A.
For Laser 530/560
Both models do not have a burner mat. A burner coating
is on the original units. When cleaning up bottom of the
burner pot, remove the old burner coating. The burner
coating can be purchase locally from an auto-parts store.
The burner coating is an exhaust manifold paint rated for
at least 1200 degees F.
For Laser 730
Place burner mat (Part # 20478613) in
center of burner bottom and position
semicircle cut out by ignitor
area. Please refer to Fig. C
* Please use Burner adhesive Part # 20478526 to attach
burner matts
NOTE:
When replacing the burner ring, carefully ensure that all
three side pins of the burner pot are correctly engaged to
the three clips on the bottom of the burner ring.
11. Reinstall the heat exchanger and the flame rod sensor
S Y S T E M S S Y S T E M S
and burner air holes. Clean all carbon on the burner
bottom by using a flat-bladed screw driver or wire
brush. Vacuum all burner deposits and wipe clean.
Make sure that all air inlet openings are clear.
burner.
several years of use and should be cleaned and
inspected before reinstallation. If the burner ring is
badly warped, cracked
should be replaced.
A bent bur ner ring may cause abnormal
combustion with uneven and/or yellow flames
extending into the heat chamber. It may cause
the heat exchanger to become red hot.
into the correct position.

Servicing

or deteriorated, it
Fuel nozzle
Fig. A
Fig. C
Igniter
11
S E R V I C E M A N U A L