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11
Maintenance
Check burner flame
1. Inspect flame through observation window.
2. If the flame is unsatisfactory at either high fire or low
fire, turn off water heater and allow water heater to
cool down. Remove the burner and clean it thoroughly
using a vacuum cleaner or compressed air. Do not use
compressed air to clean burner if performed inside a
building.
3. Remove the burner, reference FIG. 11-2 below.
4. When replacing the burner, ensure gasket is in good
condition and positioned correctly (FIG. 11-2).
Figure 11-2 Burner Assembly
INSULATION
HEAT EXCHANGER
ACCESS COVER
BURNER
IMG00554
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
flame sense electrode.
electrode does not improve, ground wiring is in good
condition, and ground continuity is satisfactory, replace
the flame sense electrode.
3. See Section 12 - Troubleshooting for other procedures to
deal with low flame signal.
Review with owner
1. Emphasize the need to perform the maintenance schedule
specified in this manual.
2. Remind the owner of the need to call a licensed contractor
should the water heater or system exhibit any unusual
behavior.
66
GASKET
AIR/GAS ARM
SCREWS
(QTY.5)
If cleaning the flame sense
Installation & Service Manual
Handling ceramic fiber materials
REMOVAL OF COMBUSTION CHAMBER
LINING
The combustion chamber insulation in
⚠ WARNING
this appliance contains ceramic fiber
material. Ceramic fibers can be converted
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.
Cleaning heat exchanger
For recommended materials; including brush, appropriate
extension(s), refractory cover, and detailed instructions see
Table 11B - Heat Exchanger Cleaning Kits on page 67.
1. Shut down water heater:
• Follow the "To Turn Off Gas to Appliance" instructions
for the water heater in Section 9 - Startup.
• Do not drain the water heater unless it will be exposed
to freezing temperatures. If using freeze prevention
fluid in system, do not drain.
2. Allow time for the water heater to cool to room temperature
if it has been firing.
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Table of Contents
Troubleshooting
