17
Heatilator • CD4236-MOD, CD4842-MOD Owner’s Manual • 2241-902 Rev. C • 11/15
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.
• Replace Glowing embers with new dime-size pieces.
DO NOT
block ports or obstruct lighting paths. Refer to
Section 4 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 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 Figures 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 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
Figure 4.4 Glass Panel Removal
D. Glass Refractory, Base Pan, Burner and
Valve Assembly Removal
It may become necessary to remove the glass panels,
base pan, burner and valve assembly. This task should
be performed by a quali
fi
ed service technician.
Figure 4.3 Remove Glass Panel Retainers
REAR PANEL RETAINER
SIDE PANEL RETAINERS
1. Remove the media.
2. Remove the side glass panel retainers (if equipped).
See Figure 4.3. Slide the side glass panels out of the
appliance as shown in Figure 4.4.
3. Remove the rear glass panel retainer (if equipped),
shown in Figure 4.3, and lift the rear glass panel out of
the appliance.