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Heat & Glo • 350X-AU, 550X-AU Installation Manual • 2279-980
• 12/17
Figure 9.1 Air Shutter Adjustment
350X-AU (NG)
3/8 in. (9 mm)
350X-AU (PROPANE/BUTANE)
Full Open
550X-AU (NG)
7/16 in. (11 mm)
550X-AU (PROPANE/BUTANE)
Full Open
The air shutter settings listed above were set based on an
appliance that was vented of the top with one 90 degree
elbow and the maximum horizontal vent run permitted; this
vent configuration is considered to be a more restrictive
vent configuration. For less restrictive venting, such as
short horizontally terminating or a vertically terminating
appliance, the shutter may be adjusted to a more “closed”
position.
Natural Gas (NG) installations
:
As a general rule, prior to the initial fire up, it is acceptable to
reduce the shutter opening to adjust for short horizontally
terminating or vertically terminating vent configurations.
Air Shutter Adjustment
The air shutter may be adjusted by locating and loosening
the wing nut shown in Figure 9.1. Push/Slide the wing
nut toward the back of the appliance to close the shutter.
Pull/Slide the wing nut toward the front of the appliance to
open the air shutter.
Air shutter settings should be adjusted by a qualified ser-
vice technician at the time of installation.
Factory Pre-Set Air Shutter Settings
E. Air Shutter Setting
NOTICE:
Flames should not appear orange or stretch to
the top refractory. If flames are dark orange with dark,
smoky tips, provide more primary air to the burner by
opening the air shutter accordingly.
CLOSED
OPEN
CLOSED
OPEN
SEE
DETAIL A
DETAIL A
Note:
Visually, a propane flame may differ from a
natural gas flame. This is due to the different chemical
compositions that make up both fuel types. In general,
the propane (LP) flames may be a little shorter and much
brighter than a natural gas (NG) flame.
Shutter Setting Verification / Flame Appearance
• After
15 minutes, the flames will be a yellow/blue mix.
The front flames may be blue at this time.
• After 30 minutes, the flames should be yellow with
some blue flames near the burner ports.
• After 1 hour, the flame will be at is maximum maturity.