4
S E R V I C E
M A N U A L
L A S E R H E A T I N G S Y S T E M S
Description
Section 1
1-19
Cloth Covered Exhaust Pipe
Insulating cloth covers are to be placed over all metal
surfaces of the exhaust line during installation. Since
combustion by-products are vented at elevated
temperatures, the exhaust pipe will become hot
during operation. The insulating cloth cover protect
s
the user from accidental contact burn with these h
ot
metal surfaces.
Laser 300/Laser 530/Laser 560/Laser 730: 20474955
IMPORTANT:
Do not operate the heater without
the insulating covers. During
installation make sure that all
exhaust lines are tightly connected.
1-20 Air Circulation Fan Filter (Cover)
The fan filter (cover) is an integral part of the fan
assembly and protects the user against physical injury
which could occur from accidental contact with the
revolving metal fan blade.
Laser 300: 20479540 Laser 530: 20479840
1-21 Fuse
In the event of a power surge or an internal wiring
hazard, the fuses will open and power to the heater will
be cut off. The fuses are rated at 250 V AC, 10-amps
and 250 V AC, 5-amps.
The electrical outlet into which the heater
is
connected should be protected by at least a 15-amp.
fuse or circuit breaker.
Laser 300/Laser 530/Laser 560/Laser 730:
20470678 / 20470679
1-22 Overheat Protector Switch
Overheat
P
rotector
S
witch is rated at 194°F (90°C).
Should a heater overheat (internal temperature rises
beyond 194°F (90°C)), the overheat protector switch
(also called a high limit switch) will open to shut off the
heater. Error code “E-12” will be displayed on the digital
indicator at this time. The overheat protector switch will
automatically reset after the heater has cooled down.
Once the heater has cooled to 158°F (70°C), the system
can be restarted manually as follows:
1. Press ON/OFF switch to “OFF”.
2. Allow heater to cool down.
3. Resolve the cause of the overheat.
4. Press ON/OFF switch to “ON” to start.
The heater will start with normal operation.
Laser 300/Laser 530/Laser 560/Laser 730: 20470206
1-23 Pressure Relief Plate
The pressure relief plate is
located
at the top part of
the heat exchanger, which effectively prevents
damage caused by misfire.
(Laser 300/530 only)
Laser 300 Laser 530: 20479530
1-24 Combustion System
In the combustion system a mixture of fuel and air is
burned to produce heat. Air is drawn from outside the
dwelling to the burner. At the same time, fuel is metered
from a storage tank into this same burner. Within the
burner, the air/fuel mixture is ignited to produce heat.
The Laser combustion systems are safeguarded by an
overheat protector switch that will shut down the heater
(to protect it from damage) in the event of excessive heat
build-up. The error code “E-12” will be displayed on the
digital indicator at this time. The overheat protector
switch will be reset after the cooling down period. Turn
the ON/OFF switch to “ON” again to restart.
Model Laser 300
