PILOT FLAME CHARACTERISTICS
MAIN BURNER FLAME CHARACTERISTICS
There will be a short blue inner flame with a much larger
lighter blue secondary flame. The burner flame may have a
yellow tip when hot. See the burner drawing showing the
approximate heights of each part of the flame. Dust in the
combustion air will produce an orange or red flame. Do not
mistake the orange or red flame for an improper yellow flame.
After use, cleaning may be required for the proper flame.
The correct flame will be almost horizontal, blue and will
extend past the thermocouple 1/4" (6 mm). The flame will
surround the thermocouple just below the tip.
On propane (LP-gas) slight yellow might occur where the pilot
flame and burner flame meet.
Natural gas pilots require adjusting when the inlet pressure is
above 5" w.c. (1.25kPa). Turn adjustment screw clockwise to
reduce flame.
Propane (LP-gas) will not require adjusting.
Pilot
Flame must extend
past the thermocouple
Thermocouple
Figure 11
Figure 12
The appliance should be inspected and cleaned before using
each year by a qualified service person.
the following instructions are designed to direct a
qualified technician through the proper periodic maintenance
and repair which may be required throughout the expected life
of this unit.
1. Remove the cover from the unit by removing the two nuts at
the bottom of the unit.
Warning:
NO attempt should be made by the homeowner
to perform these functions.
2. The gas supply should be turned OFF at the shut-off valve in
the supply piping leading to the appliance (if installed), or at
the gas meter or propane/ LP tank.
3. Remove the two screws which hold the unit to the wall
support plate and lift and pull the unit away from the wall.
4. Carefully examine the interior of the vent pipes, both large
and small diameter. If you notice any blockage or
obstruction, clean the pipes.
5. Look inside the openings of the rear of the unit and check for
any foreign materials. Remove any objects which may
block or obstruct the free flow of combustion and
ventilation air. You will only be able to see a portion of the
interior of the unit from this angle.
6. The main burner and pilot burner can be removed from the
unit for cleaning by first loosening the compression fittings
The gas to the unit
should be disconnected so the unit can be removed from
the wall.
that supply gas to both the main burner and pilot. Note:
before removing either the pilot assembly or main burner
assembly be sure to have replacement gaskets on hand.
See Figure 13. After unscrewing the gas connection to the
burner and removing the compression nuts, unscrew the
thermocouple from the base of the pilot and remove it from
the pilot assembly. Remove the four screws which hold the
main burner/pilot plate in place, and withdraw the
burner/pilot from the unit. Check the burner/pilot for dirt,
lint, or a black powdery carbon deposit. If any is noted,
brush it off completely using a soft bristled brush, or blow it
MAINTENANCE
Burner flame
Primary flame 1/4” (6 mm) to 1/2” (13 mm)
Secondary flame 4” (102 mm) to 6” (152 mm)
Figure 13
Screws that hold
the main burner/pilot
plate in place
Gas connection
to the burner
Thermocouple
Page 12
MV1XX-1-0603