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Majestic • MERC32IN, MERC32IL Installation Manual • 2401-980 Rev. L • 1/21
D. 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 input rate 4% for each 1000 feet
above 2000 feet.
• In CANADA: Input ratings are certified without a reduction
of input rate for elevations up to 4500 feet (1370 m)
above sea level. Please consult provincial and/or
local authorities having jurisdiction for installations at
elevations
above 4500 feet (1370 m).
Check with your local gas utility to determine proper
orifice size.
E. Air Shutter Setting
Air shutter settings should be adjusted by a qualified in
-
staller at the time of installation.
The air shutter is set at
the factory for minimum vertical vent run. Adjust air shut
-
ter for longer vertical runs.
NOTICE:
If sooting occurs, provide more air by opening
the air shutter.
Air Shutter Settings
Model
Gas Type
Setting
MERC32IN
NG
3/16 in.
MERC32IL
Propane
1/2 in.