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Innovative Hearth Products
DRT3500-C Series Direct-Vent Gas Fireplaces
Table 28 - Air Shutter Adjustment Guidelines
Amount of Primary Air
If air shutter is
closed too far
If air shutter is
open too far
Table 29 - Main Burner Shutter Opening—Factory Setting
Models
NOTE: When rear venting or running fireplace for an extended period of time the shutter
should be moved to a more open position by pulling rod down. (especially on LP gas)
1. Move the adjustment rod down to increase air flow and up to decrease it. The rod is located in the lower control
compartment. Position the air shutter to the factory setting (Table 29).
2. Light the fireplace. Follow the lighting procedure on the lighting label in the control compartment or Pages 70-71.
3. Allow the burner to operate for at least fifteen (15) minutes while observing the flame continuously to ensure that
the proper flame appearance is achieved (Figure 35). If the following conditions are present, adjust accordingly.
• If flame appears sooty, adjust the air shutter, incrementally, to a more open position until the proper flame
appearance is achieved.
• If flame remains blue, adjust the air shutter, incrementally, to a more closed position until the proper flame
appearance is achieved.
4. When satisfied that the burner flame appearance is normal. Turn fireplace to the off position, and reinstall the
facade, then proceed to finish the installation.
Figure 35 - Burner Flame Appearance
35" Logs
Install the Hood after fireplace is cool
21.
NOTE: All models must have a hood installed prior to
operation.
NOTE: Hood is slotted and has some adjustment. It is
suggested that the center screw should be installed first
and the ends last.
1. Attach hood using three screws as shown here.
Re-installation of the barrier
22.
Reinstall any barrier removed before operating the fireplace. The barrier is designed to
reduce the risk of burns from hot glass. Do not operate the fireplace without the barrier
installed.
NOTE: All models must have a barrier installed prior to operation.
Flame Color
Flame will
be orange
Flame will
be blue
Natural Gas
All
1/4" (6.35 mm)
Air Shutter Adjustment
Air shutter gap should be increased
Air shutter gap should be decreased
Propane Gas
1/2" (12.7 mm)
40" / 45" Logs
WARNING
900960-00D, 04/2020
Figure 34 - Air Shutter Adjustment Rod
Adjustment
Set-Screw
Burner
Tube
Air Shutter
Adjustment
Rod Down
(Fully-Open
Position)
Installation
Adjustment
Rod Up
(Fully-Closed
Position)
45
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