Restrictor - HearthStone Waitsfield DX 8770 Owner's Manual

Hearthstone Quality Home Heating Products, Inc.
Shutter Lock using a Phillips screwdriver. Move the
shutter rod left or right to adjust the flame pattern.
Push rod into the firebox to close the shutter, and
pull out to open. When the flame pattern is correct,
tighten the set screw without letting the rods move.
Figure 38 – Stove Bottom View: Air Shutter
Adjusting Rods
Figure 39 – Locking Screw and Motion Direction
Note: Very little movement is needed to substantially
change the burn and flame patterns. Some
conditions cannot be corrected through air shutter
adjustment; an adjustment must be made to the gas
supply pressure. Supply line/manifold gas line
pressure adjustments must be performed by
qualified service personnel.
complete any part of the installation or adjustment of
this unit unless technically qualified to do so.
Do not attempt to
Restrictor Plate
The restrictor plate is used to control excess draft if
necessary. Controlling the draft also changes the
aesthetics of the flame. The restrictor plate has an
unlimited range of settings (see Figures 40 & 41).
The adjustment point is on the top, center of the
firebox, accessible with the top casting removed.
Restrictor Plate Position
The restrictor plate is factory set in the fully opened
position for shipping. This ensures proper flames for
a wide variety of vent configurations and efficiency.
The restrictor consists of a sliding plate just below
the venting starter collar on the top rear of the
firebox. Depending on your vent configuration, you
may need to adjust the restrictor plate position to
reduce draft. See Figure 12 on page 15 for settings.
Restrictor Plate Adjustment
Loosen the screw and position the restrictor plate in
the desired location. Tighten the screw to lock in
place.
Figure 40 - Restrictor Fully Closed
Figure 41 - Restrictor Fully Opened (no
restriction)
WAITSFIELD Model 8770
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