72
12
Maintenance
DIR #2000534736 00
TOP PLATE
GASKET
BURNER
Figure 12-2 Burner Assembly
Check flame signal
1. At high fire the flame signal shown on the display should
be at least 10 microamps.
2. A lower flame signal may indicate a fouled or damaged
ignition / flame sense electrode. If cleaning the ignition/
flame sense electrode does not improve, ground wiring is
in good condition, and ground continuity is satisfactory,
replace the ignition / flame sense electrode.
3. See Section 13 - Troubleshooting for other procedures to
deal with low flame signal.
Review with owner
1. Review the Noble Combi Boiler User’s Information
Manual with the owner.
2. Emphasize the need to perform the maintenance schedule
specified in the Noble Combi Boiler User’s Information
Manual (and in this manual as well).
3. Remind the owner of the need to call a licensed contractor
should the boiler or system exhibit any unusual behavior.
4. Remind the owner to follow the proper shutdown
procedure and to schedule an annual start-up at the
beginning of the next heating season.
Handling ceramic fiber materials
REMOVAL OF COMBUSTION CHAMBER
LINING
The combustion chamber insulation in
this appliance contains ceramic fiber
material. Ceramic fibers can be converted
WARNING
to cristobalite in very high temperature applications. The
International Agency for Research on Cancer (IARC) has
concluded, “Crystalline silica inhaled in the form of quartz
or cristobalite from occupational sources is carcinogenic to
humans (Group 1).” Normal operating temperatures in this
appliance are below the level to convert ceramic fibers to
cristobalite. Abnormal operating conditions would have to
be created to convert the ceramic fibers in this appliance to
cristobalite.
The ceramic fiber material used in this appliance is an irritant;
when handling or replacing the ceramic materials it is advisable
that the installer follow these safety guidelines.
Avoid breathing dust and contact with skin and eyes.
• Use NIOSH certified dust respirator (N95). This type of
respirator is based on the OSHA requirements for cristobalite
at the time this document was written. Other types of
respirators may be needed depending on the job site
conditions.
Current NIOSH recommendations can be found
on the NIOSH website at http://www.cdc.gov/niosh/homepage.html.
NIOSH approved respirators, manufacturers, and phone
numbers are also listed on this website.
• Wear long-sleeved, loose fitting clothing, gloves, and eye
protection.
Apply enough water to the combustion chamber lining to
prevent airborne dust.
Remove the combustion chamber lining from the appliance
and place it in a plastic bag for disposal.
Wash potentially contaminated clothes separately from
other clothing. Rinse clothes washer thoroughly.
NIOSH stated First Aid.
Eye: Irrigate immediately.
Breathing: Fresh air.
Installation & Service Manual
F I R E T U B E C O M B I
™
