Installation & Service Manual
8Maintenance
Inspect and Clean Burner
WARNING The combustion chamber insulation in this appliance contains ceramic fiber material. The International Agency for Research on Cancer (IARC) has concluded, “Crystalline Silica 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 jobsite 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
Apply enough water to the combustion chamber lining to prevent airborne dust.
Remove 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 thoroughly.
NIOSH stated First Aid:
Eye: Irrigate immediately.
Breathing: Fresh air.
Heat Exchanger / Burner Access
a.Turn “OFF” main power to the appliance.
b.Turn “OFF” external manual gas shutoff valve to appliance.
c.Remove the control panel door.
d.Remove the outer air deflector (FIG.
e.Disconnect gas valve wiring and remove gas manifold assembly.
f.Remove ignition wire leading to the pilot assembly from the ignition module.
g.Disconnect the wiring from the flame rollout/interlock switch, see FIG.
h.Remove the lower front jacket panel.
i.Remove the control panel mounting screws. When removing the control panel, lay the control panel to the side with the wiring intact, being careful not to damage any of the wiring.
j.Remove the combustion chamber door. Use caution to prevent damage to burners, refractory, pilot or wiring.
Inspection and Cleaning Procedure
DANGER | When cleaning burner, DO NOT use a |
| steel wire brush as it may spark and create |
| |
| a hazardous situation causing property |
| damage, serious injury, or death. Use a |
| soft bristle brush when cleaning burner. |
k.Check the heat exchanger surface for sooting. The external surfaces of the copper tubes should be free of any soot deposits. (A slight black smudge is normal with some types of gases.) If abnormal soot deposits are present, the heat exchanger must be cleaned and the cause of the soot problem corrected. Proceed as follows:
l.Remove soot from burners and bottom of the finned tubes with a stiff bristle brush. Dirt may also be removed from burner ports by rinsing the burner thoroughly with water. Drain and dry burners before
An appliance installed in a dust or dirt contaminated atmosphere will require cleaning of the burners on a 3 to 6 month schedule or more often, based on severity of contamination. Contaminants can be drawn in with the combustion air.
m.Remove gas manifold as described in steps a. through e. in “Heat Exchanger/Burner Access.”
n.Loosen mounting screws and remove front control panel.
o.Loosen screws on the upper front jacket panel and remove toward front of the appliance. Use caution to prevent damage to refractory on the doors inner surface.
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