Heatilator • NDV3630I-B, NDV3933I-B, NDV4236I-B, NDV4236I-NVR, NDV4842I-B Owner’s Manual • 2382-981 Rev. N • 5/22
16
C. Maintenance Tasks - Qualified Service
Technician
The
following tasks must be performed by a qualified ser
-
vice technician.
Gasket Seal and Glass Assembly Inspection
Frequency:
Annually
By:
Qualified Service Technician
Tools needed:
Protective gloves, drop cloth and a stable
work surface.
• Inspect gasket seal and its condition.
• Inspect fixed glass assembly for scratches and nicks that
can lead to breakage when exposed to heat.
• Confirm there is no damage to glass or glass frame.
Replace as necessary.
• Verify that fixed glass assembly is properly retained and
attachment components are intact and not damaged.
Replace as necessary.
Log Inspection
Frequency:
Annually
By:
Qualified Service Technician
Tools needed:
Protective gloves.
• Inspect for damaged or missing logs. Replace as neces-
sary. Refer to Installation manual for log placement instruc-
tions.
• Verify correct log placement and no flame impingement
causing sooting. Correct as necessary.
Firebox Inspection
Frequency:
Annually
By:
Qualified 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 fireplace if firebox has been perforated.
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.
Figure 4.2 IPI Pilot Flame Pattern
Pilot and 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.
• Inspect orifice for soot, dirt and corrosion. Verify orifice
size is correct. See Service Parts List for proper orifice
sizing.
• Verify air shutter setting is correct. See Installation
Manual for required air shutter setting. Verify air shutter
is clear of dust and debris.
• 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
IPI flame sensing rod for soot, corrosion and
deterioration. Polish with 320 grit Emery cloth and/or
3M™ Scotch-Brite Abrasive Hand Pad.
• 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.
• Verify manifold and inlet pressures. Adjust regulator as
required.
• Check all accessible gas-carrying tubes, connections,
pipes and other components for leaks.
• Inspect pilot flame pattern and strength. See Figure 4.2
for proper pilot flame pattern. Clean or replace orifice
spud as necessary.
• Replace Glowing embers with new dime-size pieces.
DO NOT
block ports or obstruct lighting paths. Refer
to appliance installation manual for proper ember
placement.
• 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 batteries have been removed from battery back-up
to prevent premature battery failure or leaking.