Air Shutter Setting - Heat & Glo TRUE-36S-IFT Installation Manual

E. 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 pre-set at the factory for minimum vertical, maximum
horizontal vent run for this appliance: 2 ft. vertical and 7
in. horizontal).
Factory Pre-Set Air Shutter Settings
MODEL
TRUE-36
TRUE-42
TRUE-50
Natural Gas (NG) installations:
As a general rule, it is acceptable to reduce the shutter
opening to adjust for vertical vent pipe sections prior to
the initial fi re up.
• Vertical Termination: May reduce shutter setting by 1/8 in.
• Horizontal Termination (more than 4 ft. vertical in vent
confi guration): May reduce shutter setting by 1/8 in.
• Horizontal Termination (less than 4 ft vertical in vent
confi guration): May reduce shutter setting by 1/16 in.
Propane (LP) installations
• It is recommended that the air shutter on propane
appliances remain at full open position.
Air Shutter Adjustment
Adjustment can be made to the air shutter with or without
the logs installed with a ¼ in. nut driver. See Figure 1.
Heat & Glo • TRUE-36-IFT, TRUE-42-IFT, TRUE-50-IFT Installation Manual • 2461-980 Rev. B • 2/17
NG LP
1/2 in. Full Open
11/16 in. Full Open
5/8 in. Full Open
Figure 1. Air Shutter Location
To adjust air shutter:
• Loosen the screw on the burner assembly.
• To close the air shutter, turn shutter clockwise.
• To open air shutter, turn shutter counterclockwise.
• Tighten the screw.
NOTICE: Flames should not appear orange or stretch to
the top refractory. If sooting occurs, provide more air by
opening the air shutter.
Shutter Setting Verifi cation / 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 its maximum maturity.
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
LP flames may be a little shorter and much brighter than
a natural gas flame.
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