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Majestic • MERC32IN, MERC32IL, MERC32VN, MERC32VL Owner’s Manual • 2401-981 Rev. L • 9/20
Control Compartment and Firebox Top
Frequency:
Annually
By:
Qualified Service Technician
Tools needed:
Protective gloves, vacuum cleaner, dust
cloths
• Vacuum and wipe out dust, cobwebs, debris or pet hair.
Use caution when cleaning these areas. Screw tips that
have penetrated the sheet metal are sharp and should
be avoided.
• Remove all foreign objects.
• Verify unobstructed air circulation.
Burner Ignition and Operation
Frequency:
Annually
By:
Qualified Service Technician
Tools needed:
Protective gloves, vacuum cleaner, whisk
broom, flashlight, voltmeter, indexed drill bit set, and a
manometer.
• Verify burner is properly secured and aligned with pilot
or igniter.
• Clean off burner top, inspect for plugged ports, corrosion
or deterioration. Replace burner if necessary.
• Replace ember material with new dime-size pieces.
DO NOT
block ports or obstruct lighting paths. Refer
to appliance installation manual for proper ember
placement.
• Verify batteries have been removed from battery back-
up IPI systems to prevent premature battery failure or
leaking.
• Check for smooth lighting and ignition carryover to all
ports. Verify that there is no ignition delay. Inspect and
ensure the lighting of the main burner occurs within four
seconds of the main gas valve opening.
• Inspect for lifting or other flame problems.
• Verify air shutter setting is correct. See Installation
Manual for required air shutter setting. Verify air shutter
is clear of dust and debris.
• Inspect orifice for soot, dirt and corrosion. Verify orifice
size is correct. See Service Parts List for proper orifice
sizing.
• Inspect pilot flame pattern and strength. See Figures 4.2
and 4.3 for proper pilot flame pattern. Clean or replace
orifice spud as necessary.
• Inspect thermocouple/thermopile or IPI
flame sensing
rod for soot, corrosion and deterioration. Polish with fine
steel wool or replace as required.
• Verify thermocouple/thermopile millivolt output. Replace
pilot as necessary (Standing pilot only).
• Verify that there is not a short in flame sense circuit
by checking continuity between pilot hood and flame
sensing rod. Replace pilot as necessary (IPI only).
Figure 4.2 IPI Pilot Flame Patterns
Figure 4.3 Standing Pilot Flame Patterns
• Verify manifold and inlet pressures. Adjust regulator as
required.
• Check all accessible gas-carrying tubes, connections,
pipes and other components for leaks.
