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Heat & Glo •
TRUE-36, TRUE-42, TRUE-50 • 2282-900 Rev. D • 8/12
J. Air Shutter Setting
Air shutter settings should be adjusted by a qualifi ed ser-
vice technician at the time of installation. The air shutter is
set at the factory for minimum vertical vent run. Adjust air
shutter for longer vertical runs. See Figure 14.14.
Flame Appearance
• After 15 minutes, the fl ame will be a yellow/blue mix.
The front fl ames may be blue at this time.
• After 30 minutes, the fl ame should be yellow with some
blue fl ame near the burner ports.
• After 1 hour, the fl ame will be at is maximum maturity.
Figure 14.14 Air Shutter
Air Shutter Settings
To adjust air shutter:
• Loosen the screw on the burner assembly.
• The air shutter should only be adjusted in increments of
1/8 in.
• To close the air shutter, turn shutter clockwise.
• To open air shutter, turn shutter counterclockwise.
• Tighten the screw.
NOTICE: Flame should not appear orange or stretch to
the top refractory. If sooting occurs, provide more air by
opening the air shutter.
Note: Visually, a propane fl ame may differ from a natural
gas fl ame. This is due to the different chemical compositions
that make up both fuel types. In general, the LP fl ames may
be a little shorter and much brighter than a natural gas fl ame.
MODEL NG LP
TRUE-36 1/2 in. Full Open
TRUE-42 11/16 in. Full Open
TRUE-50 5/8 in. Full Open