Desa FAS-3B - Manual (Page 14)

14 105566
INFRARED NATURAL GAS HEATER
INSPECTING
BURNER
Check pilot flame pattern and burner flame
pattern often.
PILOT FLAME PATTERN
Figure 22 shows a correct pilot flame pattern.
Figure 23 shows an incorrect pilot flame
pattern. The incorrect pilot flame is not touch-
ing the thermocouple. This will cause the
thermocouple to cool. When the thermo-
couple cools, the heater will shut down.
If pilot flame pattern is incorrect, as shown
in Figure 23
• turn heater off (see To Turn Off Gas to
Appliance)
• see Troubleshooting, pages 15 through 17
GRH/OV 009 GOOD PILOT
Figure 22 - Correct Pilot Flame Pattern
Thermocouple
GRH/OV 010 BAD PILOT
Thermocouple
Figure 23 - Incorrect Pilot Flame Pattern
Pilot Burner
Pilot Burner
Figure 24 - Correct Burner Flame Pattern
Bad Burner Pattern-Plaque GRH/OV 019
Figure 25 - Incorrect Burner Flame Pattern
BURNER FLAME PATTERN
Figure 24 shows a correct burner flame
pattern. Figure 25 shows an incorrect burner
flame pattern.
If pilot flame pattern is incorrect, as shown
in Figure 25
• turn heater off (see To Turn Off Gas to
Appliance)
• see Troubleshooting, pages 15 through 17
CLEANING AND
MAINTENANCE
ODS/PILOT AND BURNER
ORIFICE
• Use a vacuum cleaner, pressurized air, or
small, soft bristled brush to clean.
CABINET
Air Passageways
• Use a vacuum cleaner or pressurized air
to clean.
Exterior
• Use a soft cloth dampened with a mild
soap and water mixture. Wipe the cabi-
net to remove dust.
CAUTION: You must keep
control areas, burner, and circu-
lating air passageways of heater
clean. Inspect these areas of
heater before each use. Have
heater inspected yearly by a quali-
fied service person. Heater may
need more frequent cleaning due
to excessive lint from carpeting,
pet hair, etc.
WARNING: Turn off heater
and let cool before servicing.
TO TURN OFF GAS TO
APPLIANCE
Shutting Off Heater
1. Turn control knob clockwise
to the OFF position.
2. Turn off all electric power to the ap-
pliance if service is to be performed.
Shutting Off Burner Only (pilot
stays lit)
Turn control knob clockwise to
the PILOT position.
OPERATING
HEATER
Continued
MANUAL LIGHTING
PROCEDURE
1. Follow steps 1 through 5 under Light-
ing Instructions, page 13.
2. With control knob pressed in, strike
match. Hold match to pilot until pi-
lot lights.
3. Keep control knob pressed in for 30
seconds after lighting pilot. After 30
seconds, release control knob.
THERMOSTAT
CONTROL
OPERATION
The thermostatic control used on these
models differs from standard thermo-
stats. Standard thermostats simply turn
on and off the burner. The thermostat
used on this heater senses the room tem-
perature. At times the room may exceed
the set temperature. If so, the burner will
shut off. The burner will cycle back on
when room temperature drops below the
set temperature. The temperature set-
ting knob can be set to any comfort level
between 1 and 7.
Note: The thermostat sensing bulb mea-
sures the temperature of air near the
heater cabinet. This may not always agree
with room temperature (depending on
housing construction, installation loca-
tion, room size, open air temperatures,
etc.) Frequent use of your heater will let
you determine your own comfort levels.