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Heat & Glo • MEZZO36, MEZZO36ST, MEZZO48, MEZZO48ST Owner’s Manual • 2300-971 Rev. C • 8/14
C. Maintenance Tasks: Quali
fi
ed Service
Technician
The
following tasks must be performed by a quali
fi
ed ser-
vice technician.
Gasket Seal and Glass Assembly Inspection
Frequency:
Annually
By:
Quali
fi
ed Service Technician
Tools needed:
Protective gloves, drop cloth and a stable
work surface.
• Inspect gasket seal and its condition.
• Inspect
fi
xed glass assembly for scratches and nicks that
can lead to breakage when exposed to heat.
• Con
fi
rm there is no damage to glass or glass frame.
Replace as necessary.
• Verify that
fi
xed glass assembly is properly retained and
attachment components are intact and not damaged.
Replace as necessary.
Firebox
Frequency:
Annually
By:
Quali
fi
ed Service Technician
Tools needed:
Protective gloves, sandpaper, steel wool,
cloths, mineral spirits, primer and touch-up paint.
• Inspect for paint condition, warped surfaces, corrosion
or perforation. Sand and repaint as necessary.
• Replace
fi
replace if
fi
rebox has been perforated.
Control Compartment and Firebox Top
Frequency:
Annually
By:
Quali
fi
ed 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:
Quali
fi
ed Service Technician
Tools needed:
Protective gloves, vacuum cleaner, whisk
broom,
fl
ashlight, 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.
• Inspect for lifting or other
fl
ame 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 ori
fi
ce for soot, dirt and corrosion. Verify ori
fi
ce
size is correct. See Service Parts List for proper ori
fi
ce
sizing.
• Verify manifold and inlet pressures. Adjust regulator as
required.
• Inspect pilot
fl
ame pattern and strength. See Figure 4.2
for proper pilot
fl
ame pattern. Clean or replace ori
fi
ce
spud as necessary.
• Inspect
IPI
fl
ame sensing rod for soot, corrosion and
deterioration. Polish with
fi
ne steel wool or replace as
required.
• Verify IPI millivolt output. Replace as necessary.
• Verify that there is not a short in
fl
ame sense circuit
by checking continuity between pilot hood and
fl
ame
sensing rod. Replace pilot as necessary.
Figure 4.2 IPI Pilot Flame Patterns
