S E R V I C E
M A N U A L
13
L A S E R H E A T I N G S Y S T E M S
L A S E R H E A T I N G S Y S T E M S
Servicing
Section 3
3-6
Inspect Intake/Exhaust Air Lines
Verify that all intake/exhaust air lines are free of leaks
and that there are no loose connections, as specified
below:
STEP 1: Remove Insulating Cloth Cover
Remove the insulating cloth covers from all exhaust
lines.
STEP 2: Inspection of Intake/Exhaust Air Lines
A. Visually inspect both the intake air and exhaust lines
for obvious cracks, leaks or loose connections. Black
carbon deposits may be evidence of leakage.
B. Be sure that all lines are installed tightly and securely,
especially at the joints.
C. Turn heater to “ON”.
D. Carefully apply a small amount of soapy water (with a
paint brush) to the surface areas and joints of the
intake/exhaust air lines.
Any leaks that may exist will be readily identified by
the appearance of bubbles.
STEP 3: Return to Operating Condition
A. Turn heater to “OFF”.
B. Dry all lines with paper towels.
C. Repair any leaks that have been found (if necessary,
replace the tubing or O-ring).
D. Replace insulating cloth covers.
3-7
Verify Igniter Operation
Visually inspect igniter operation.
WARNING:
Heater is operational during this
inspection, Avoid direct contact with
any heated or electrical compoment
s
.
STEP 1: Prepare for Inspection
Remove grille and front panel assembly.
STEP 2: Visual Inspection
A. Remove the igniter half way.
B. Turn heater to “ON”.
C. Igniter should start to glow red within 30-40 seconds.
If the igniter does not glow red, check for power at
120V AC (or 220V AC) and resistance 17 to 19
Ω
at
room temperature of 73˚F (23˚C).
CAUTION:
If igniter malfunctions, do not turn the
heater to “ON” repeatedly.
Otherwise, excess fuel may drain in
the burner pot.
STEP 3: Reassembly of Heater
Turn the heater to “OFF” and replace the front panel
assembly.
3-8
Clean Fuel Inlet Strainer
Contaminants are trapped by the fuel inlet strainer to
prevent them from clogging the fuel constant level valve.
The fuel inlet strainer, itself has a great number of small
pores. Whenever a strainer is torn or disfigured (en-
larged pores), it should be replaced immediately.
Check and clean the fuel strainer (once a month).
The strainer of the fuel sump should be cleaned once a
month and before storing heater at the end of each
season.
WARNING:
Close the fusible link valve on the
heater or close the shut-off valve of
the
removable fuel tank or the external
fuel tank to avoid draining all the fuel
from the tanks
NOTE:
Power should be “OFF” during the performance
of this procedure.
STEP 1: Disassembly
A.
Remove
the two (2) screws from the strainer cover
and remove
cover
.
NOTE:
To catch the fuel which will drain, set the oil
catch
under the fuel sump
, with a small
container under it.
B. Carefully remove the strainer gasket which is located
behind the strainer cover.
Oil catch
(Part #20474925)
Fuel strainer
(Part #20478550)
Strainer gasket
(Part #20475552)
Drain screw
with O-ring
(Part #20475551)
Strainer cover
Figure 4-1 CLEAN FUEL INLET STRAINER
