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111245-01A
For more information, visit www.desatech.com
For more information, visit www.desatech.com
25
25
OPERATING FIREPLACE
To Turn Off Gas To Appliance
Optional Blower Operation
INSPECTING BURNERS
Pilot Flame Pattern
Main Burner
OPERATING FIREPLACE
Continued
Locate the blower switch by opening lower louver on fireplace.
Blower switch is located at lower right inside louver door.
The GA3650T/GA3700T Series thermostat-controlled blower
has a variable speed control with an ON/OFF switch. The
blower will start when the thermostat senses a sufficient in-
crease in firebox temperature. The GA3700/GA3750 Series
variable speed blower also has an ON/OFF switch built into the
variable speed control.
Note for GA3650T/GA3700T Series Only:
If you are using
this series blower, your fireplace and blower will not turn on
and off at the same time. The fireplace 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 firebox temperature decreases.
Note:
It is safe to operate fireplace with blower turned off.
However, the blower helps distribute heated air from the fireplace.
Follow installation instructions included with the blower
accessory.
OPTIONAL BLOWER
OPERATION
TO TURN OFF GAS
TO APPLIANCE
Shutting Off Heater When Manually Lit
Set manual ignition bypass switch on control panel to OFF
(automatic ignition position). This will cause the controls to shut
down the fireplace.
Check pilot flame pattern and burner flame patterns often.
PILOT FLAME PATTERN
Figure 51 shows a correct pilot flame pattern. Figure 52 shows an
incorrect pilot flame pattern. The incorrect pilot flame is not
properly heating the thermocouple. When the thermocouple cools,
the heater will shut down.
If pilot flame pattern is incorrect, as shown in Figure 52
• turn heater off (see To Turn Off Gas to Appliance, page 24 or 25
depending on situation)
• see Troubleshooting, pages 27 through 29
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.
INSPECTING BURNERS
MAIN BURNER
Periodically inspect all burner flame holes with the heater running.
All slotted burner flame holes should be open with flame present.
All round burner flame holes should be open with a small blue flame
present. Some burner flame holes may become blocked by debris or
rust, with no flame present. If so, turn off heater and let cool.
Remove blockage, blocked burner flame holes may create soot.
Figure 51 - Correct Pilot Flame Pattern (Natural Gas Pilot
Assembly Shown)
Figure 52 - Incorrect Pilot Flame Pattern (Natural Gas Pilot
Assembly Shown)
Thermocouple
Pilot Burner
Thermocouple
Pilot Burner