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107569
UNVENTED NATURAL GAS FIREPLACE
For more information, visit www.desatech.com
Locate the blower switch by opening lower
louver on fireplace. Blower switch is lo-
cated at lower right inside louver door.
The GA3650TA Series thermostat-con-
trolled blower has a variable speed con-
trol with an ON/OFF switch. The blower
will start when the thermostat senses a
sufficient increase in firebox temperature.
The GA3750 Series variable speed blower
also has an ON/OFF switch built into the
variable speed control.
Note for GA3650TA Series Only:
If
you are using GA3650TA 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 con-
tinue 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
Figure 52 - Correct Pilot Flame Pattern
Pilot Burner
Thermocouple
Figure 53 - Incorrect Pilot Flame Pattern
Check pilot flame pattern and burner flame
patterns often.
PILOT FLAME PATTERN
Figure 52 shows a correct pilot flame pat-
tern. Figure 53 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 53
• turn heater off (see To Turn Off Gas to
Appliance, page 21)
•
see Troubleshooting, pages 24 through 26
Pilot Burner
INSPECTING
BURNERS
MAIN BURNER
Periodically inspect all burner flame holes
with the heater running. All slotted burner
flame holes should be open with yellow
flame present. All round burner flame holes
should be open with a small blue flame
present. Some burner flame holes may be-
come blocked by debris or rust, with no
flame present. If so, turn off heater and let
cool. Either remove blockage or replace
burner. Blocked burner flame holes will
create soot.
Thermocouple
OPERATING
FIREPLACE
Continued
TO TURN OFF GAS
TO APPLIANCE
Shutting Off Heater When
Manually Lit
Set manual ignition bypass switch on con-
trol panel to OFF (automatic ignition
position). This will cause the controls to
shut down the fireplace.
5. Turn the override handle fully coun-
terclockwise to the PILOT po-
sition. The handle will not stop but
will begin to slip when you have fully
turned to the PILOT position.
6. While holding the valve handle in the
PILOT position, press and release
piezo ignitor button (see Figure 50,
page 21). This will light the pilot. If
needed, keep pressing ignitor button
until pilot lights.
7. When pilot flame is lit, hold manual
override handle until thermocouple
heats (approximately 5 to 15 sec-
onds). If pilot goes out, repeat pro-
cess. If several attempts to light the
pilot fail, contact a qualified service
person or gas supplier for repairs.
8. When thermocouple is heated, re-
lease override handle. The main
burner will immediately light on high
flame. Adjust flame size by turning
override handle.