www.desatech.com
118621-01B
20
INSpECTING HEATER
Check pilot flame pattern and burner flame
pattern often.
PILOT FLAME PATTERN
Figure 29 shows a correct pilot flame pattern.
Figure 30 shows an incorrect pilot flame pat-
tern. The incorrect pilot flame is not touching
the thermocouple. This will cause the thermo-
couple to cool. When the thermocouple cools,
the heater will shut down.
If pilot flame pattern is incorrect, as shown
in Figure 30
• turn heater off (see
To Turn Off Gas to Ap-
pliance
, page 16)
• see
Troubleshooting
, page 22
Note:
The pilot flame on natural gas units will
have a slight curve, but flame should be blue
and have no yellow or orange color.
bURNER FLAME PATTERN
Figure 31 shows the burners in the ON and
OFF positions. Burners will come on and go off
when the remote control is set in the manual
on mode or thermostat mode.
Figure 32 shows a correct burner flame pat-
tern. Figure 33 shows an incorrect burner
flame pattern.
If burner flame pattern is incorrect, as shown
in Figure 33
• turn heater off (see
To Turn Off Gas to Ap-
pliance,
page 16)
• see
Troubleshooting
, page 22
Thermocouple
Pilot
Burner
Pilot
Burner
Thermocouple
Blue Flame
Yellow
Flame
Figure 29 - Correct Pilot Flame Pattern
Figure 30 - Incorrect Pilot Flame Pattern
Figure 32 - Correct Burner Flame Pattern
Figure 33 - Incorrect Burner Flame
Pattern
Figure 31 - Burner Patterns
Burners ON
Burners OFF
OPERATING
bLOWER
This heater has a thermostatic blower that will
automatically turn ON or OFF.
Note:
Your heater and thermostat blower will
not turn on and off at the same time. The
heater may run for several minutes before the
blower turns on. After the heater modulates to
the pilot position, the blower will continue to
run. The blower will shut off after the heater
cabinet temperature decreases.
Note:
It is safe to operate heater with blower
turned off. However, the blower helps distrib-
ute heated air from the heater.
OpERATING HEATER
Continued
