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28 Heatilator • Novus BV-Mesh • 4031-553 Rev F • 11/07
I. Air Shutter Setting
This appliance has an adjustable air shutter (which controls
the primary air) factory set for the minimum vertical vent run
(see Figure 12.10). If your installation has more than the
minimum required vertical vent length, adjustment of the air
shutter may be necessary to obtain optimal fl ame appear-
ance. This should be adjusted by a qualifi ed installer at
the time of installation.
• If the vent configuration is installed incorrectly, the
vent may cause the fl ames inside the appliance to lift
or “ghost,” which is a dangerous situation. Inspect the
fl ames after installation to ensure proper performance. If
the vent confi guration is correct, yet the fl ames are lifting
or ghosting, shut off the gas to the appliance and contact
the dealer.
• Your air shutter is provided at 1/8 in. open for natural
gas, 3/8 in. open for propane (30 in./33 in. appliances),
and full open for 36 in. and 42 in. propane appliances. In
the event soot is accumulating in your appliance, the air
shutter should be opened farther. This can be done by
opening the control access panel and locating the two wing
studs and two wing nuts attaching the valve assembly to
the fi rebox. Remove the wing nuts and wing studs, slide
the valve assembly to the left and lower. Rotate the valve
assembly horizontally and remove from underneath the
appliance. See Figure 12.11.
Figure 12.10 Air Shutter
Note: To avoid damage to the pilot assembly,
remove the valve assembly pilot side fi rst.
If the valve assembly gasket is damaged, it
should be replaced.
• Locate the air shutter mounted on the end of the main
burner. Loosen the locking screw, open the air shutter,
and retighten the locking screw. See Figure 12.10.
• Replace the valve assembly, wing nuts and wing studs as
removed, making sure to line the orifi ce up with the main
burner neck.
Figure 12.11 Valve Assembly