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Innovative Hearth Products
DRT35ST and DRT35PF Direct-Vent Gas Fireplaces
Burner Adjustment
WARNING
• Air shutter adjustment should
only be performed by a quali-
fied professional service tech-
nician.
• Ensure front glass panel are
in place and sealed during
adjustment.
CAUTION
• Soot will be produced if the
air shutter is closed too much.
Any damage due to sooting,
resulting from improperly
setting the air shutter, is not
covered under the warranty.
• The air shutter door and
nearby appliance surfaces
are hot. Exercise caution to
avoid injury while adjusting
flame appearance.
1. Refer to Figure 58 for proper flame ap-
pearance. To adjust the flame, rotate the
adjustment rod toward the back or toward
the front of the fireplace (rod located in the
lower control area). Position the air shutter
to the factory setting as shown in the table
in Figure 59.
2. Light appliance (follow lighting procedure
on lighting label in control compartment or
see the Installation and Operation Manual).
3. Allow the burner to operate for at least 15
minutes while observing the flame continu-
ously to ensure that the proper flame ap-
pearance has been achieved. If the following
conditions are present, adjust accordingly.
• If flame appears weak or sooty, adjust
the air shutter, incrementally, to a more
open position until the proper flame ap-
pearance is achieved.
• If flame remains blue, adjust the air
shutter, incrementally, to a more closed
position until the proper flame appear-
ance is achieved.
4. Leave the control knob (off/pilot/on) in the
ON position and the burner OFF/ON switch
OFF (and remote switches, if applicable).
5. When satisfied that the burner flame appear-
ance is normal, re-install the lower control
compartment door then proceed to finish
the installation.
36
Vermiculite
Figure 58 -
Burner Flame Appearance
Decrease Shutter Opening
In This Direction
Orifice
Increase Shutter
Air Shutter
Opening In This
Adjusting
ON/OFF Switch
Direction
Rod
Note - Burners are omitted in this view for clarity.
Main Burner Factory Air Shutter
Opening Setting - All Models
Model
Natural
Gas
All Models
1/8"
3.2mm
Adjustment Rod Positions
Figure 59
(when viewed from above)
Combustible Wall
Framing
Combustible
Finished Wall
Materials
This Area Must Remain Clear
of Combustible Materials
5" Top Standoff
Front face assembly and
hood must be installed
as shown.
Figure 60 - FINISHING REQUIREMENTS
NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.
Installation and Operation Instructions
Step 12. HOOD INSTALLATION
Refer to Figure 60. All of these appliances
must have front face assemblies and barriers
and hoods installed prior to operating.
FINISHING REQUIREMENTS
Wall Details
Complete finished interior wall. To install the
appliance facing flush with the finished wall,
position framework to accommodate the thick-
ness of the finished wall (Figure 60).
Cold Climate Insulation and
Page 11 for Clearances
Propane
Gas
1/4"
6.4mm
This Area Must Remain
Clear of Combustible
Materials
1" Min.
(26 mm)
Top of Appliance
Top of
Door Frame
900300-00, 01/2019
See Page for
3" (77 mm)
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