Desa Tech CHDV34PA - Manual (Page 26)

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DIRECT-VENT FIREPLACE (NATURAL/PROPANE/LP)
CHDV34NA, PA
Figure 57 - Typical Flame Pattern for
CHDV34NA, PA
OPERATING
OPTIONAL BLOWER
ACCESSORY
Locate the blower controls by opening
the lower louver panel on the fireplace.
Blower controls are located on the left
side of the switch bracket to the left just
inside the louver panel.
Both the GA3750 manual blower and the
CDA3620T thermostatically-controlled
blower have an ON setting and an OFF
setting. The blower will only run when the
switch is in the ON position. In the OFF
position, the blower will not operate.
Thermocouple
Thermopile
1/8"
Pilot Burner
Piezo
Ignitor
OPERATING
OPTIONAL GWMT1
WALL MOUNTED
THERMOSTAT
Light the fireplace as instructed in Light-
ing Instructions on page 24. Set wall ther-
mostat to desired temperature.
This thermostat has been electronically
calibrated at the factory and requires no
adjustment or leveling.
Upon installation, the thermostat must
be allowed to stabilize at room tempera-
ture for a minimum of 30 minutes for
proper operation.
To turn the fireplace off, adjust thermo-
stat to the lowest setting and turn the gas
control knob back to PILOT. The pilot
will remain lit.
IMPORTANT: To turn the pilot off, turn
the gas control knob on the heater to the
OFF position.
WARNING: Do not connect
the thermostat to a power source.
Electrical shock and/or a fire haz-
ard will occur.
Figure 56 - Pilot Assembly
Check pilot flame pattern and burner flame
patterns often.
PILOT ASSEMBLY
The pilot assembly is factory preset for the
proper flame height. Alterations may have
occurred during shipping and handling. Call
a qualified service person to readjust the
pilot if necessary.
The height of the thermopile must be 3/8" to
1/2" above the pilot flame as shown in Figure
56. The thermocouple must be at a height of
about 1/8" above the pilot flame. The flame
from the pilot burner must extend beyond
both the thermocouple and thermopile.
3/8" to 1/2"
OPERATING
FIREPLACE
Continued
If you pilot assembly does not meet these
requirements:
• turn fireplace off (see To Turn Off Gas to
Appliance, page 24)
• see Troubleshooting, pages 28 through 30
Note for DA3620T Only: If you are
using DA3620T blower with optional ther-
mostat (wall mounted or remote control)
for the fireplace, 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.
The blower helps distribute heated air
from the fireplace. Periodically check the
louvers of the firebox and remove any
dust, dirt, or other obstructions that will
hinder the flow of air.
INSPECTING
BURNERS
BURNER FLAME PATTERN
Burner flames will be steady; not lifting or
floating. Flame patterns will be different
from unit to unit and will vary depending on
installation type and weather conditions.
If the vent configuration is installed incor-
rectly, the flames will lift or "ghost". This
can be dangerous. Inspect the flames after
installation to ensure proper installation and
performance.
Figure 57 shows a typical flame pattern for
CHDV34(N/P)(A) models.
If burner flame pattern differs from that
described:
• turn fireplace off (see To Turn Off Gas to
Appliance, page 24)
• see Troubleshooting, pages 28 through 30