High Altitude Installations; Air Shutter Setting - Heat & Glo MEZZO36 Installation Manual

E. High Altitude Installations
NOTICE: If the heating value of the gas has been reduced,
these rules do not apply. Check with your local gas utility
or authorities having jurisdiction.
When installing above 2000 feet elevation:
• In the USA: Reduce burner orifi ce 4% for each 1000 feet
above 2000 feet.
• In CANADA: Reduce burner orifi ce 10% for elevations
between 2000 feet and 4500 feet. Above 4500 feet,
consult local gas utility.
F. Air Shutter Setting
Air shutter settings may be adjusted by a qualifi ed install-
er 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 9.6.
• Refer to Gas Service Access instructions in Section 9.C
to access the air shutter.
• Loosen the 1/4 in. screw.
Figure 9.6 Air Shutter Location
Heat & Glo • MEZZO36, MEZZO36ST, MEZZO48, MEZZO48ST Installation Manual • 2300-970 Rev. D • 6/14
40
DETAIL
• Twist shutter to adjust.
• Shutter may be open for longer horizontal vent runs.
• Do not close the air shutter more than 1/16 in. for NG or
1/4 in. for propane.
• Tighten the screw.
NOTICE: If sooting occurs, provide more air by opening
the air shutter.
Air Shutter Settings
MEZZO36
MEZZO36ST
MEZZO48
MEZZO48ST
GLASS REFRACTORY
KIT
LOG KIT
NG Propane
Standard Standard
Opening= Opening=
3/16 in. Full Open
1/4 in. Full Open