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Heat & Glo • PRIMO48, PRIMO48ST, PRIMO60, PRIMO60ST, PRIMO72, PRIMO72ST Installation Manual • 2310-970 Rev. L • 2/16
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 ori
fi
ce 4% for each 1000 feet
above 2000 feet.
• In CANADA: Reduce burner ori
fi
ce 10% for elevations
between 2000 feet and 4500 feet. Above 4500 feet,
consult local gas utility.
Figure 9.9 Air Shutter Location
F. Air Shutter Setting
Air shutter settings may be adjusted by a quali
fi
ed installer
at the time of installation. The air shutter is set at the fac-
tory for optimal
fl
ame appearance. The factory air shutter
setting is recommended for all vent runs. See Figure 9.9.
• Refer to Gas Service Access instructions in Section 9.C
to access the air shutter.
• Loosen the 1/4 in. screw.
• Twist shutter to adjust.
• The factory setting is recommended for all vent runs.
• Do not close the air shutter more than 1/16 in. for NG or
3/8 in. for propane.
• Tighten the screw.
NOTICE:
If sooting occurs, provide more air by opening
the air shutter.
Air Shutter Settings
PRIMO48
PRIMO48ST
NG
Propane
1/16 in.
3/8 in.
PRIMO60
PRIMO60ST
1/8 in.
Full Open
PRIMO72
PRIMO72ST
1/8 in.
N/A
DETAIL
The PRIMO is equipped with an
internal air shutter.