Majestic • MER36MN, MER42MN Installation Manual • 2599-980 Rev. B • 5/23
56
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
WARNING!
Risk of Explosion or Delayed Ignition!
Improperly adjusted air shutter could cause soot buildup.
CAUTION!
Risk of Burns!
Components are HOT! Wear
protective gloves when adjusting shutter.
NOTICE:
If sooting occurs, provide more air by opening
the air shutter.
Air shutter settings should be adjusted by a qualified ser
-
vice technician at the time of installation.
The air shutter
is set at the factory for a typical minimum vent run which
consists of enough horizontal vent pipe to terminate
through a 2x6 wall:
Top Vented with the required six inch minimum vertical,
one 90 degree elbow and DVP-TRAP2 termination cap
It may need to be adjusted for other venting
scenarios. Adjust air shutter for different vent runs. See
Figure 9.2.
• Loosen the wing nut.
• Move the air handle to the right to open the air shutter.
• Move the air handle to the left to close the air shutter.
• Tighten the wing nut.
Shutter Setting Verification / 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.
NOTICE:
Flames should not appear orange or stretch
to the top refractory/ top of firebox. If flames are dark
orange with dark, smoky tips, provide more primary air to
the burner by opening the air shutter accordingly.
Figure 9.2 Air Shutter (Generic Fireplace Shown)
AIR SHUTTER WING NUT
Air Shutter Settings
(Factory Set to Minimum Vent Runs)
MODEL
GAS TYPE MINIMUM VENT
RUN
MER36MN
NG
3/4 IN.
MER42MN
NG
3/4 IN.
Burner Identification
Figure 9.3 illustrates the identification pattern of the
burner. This can be found on the underside of the burner
along an edge.
Figure 9.3 Burner Identification
MER36MN
MER42MN
