INSPECTION CLEANING PROCEDURE
WARNING
The combustion chamber lining in this appliance contains ceramic fiber materials. Ceramic fibers can transform into cristobalite (crystalline silica) when exposed to temperatures above 2192°F (1200°C) dependent upon the length of exposure time.*
The International Agency for Research on Cancer (I.A.R.C.) has concluded, "Crystalline silica inhaled in the form of quartz or cristobalite from occupational sources is carcinogenic to humans."**
Testing has confirmed that the ceramic fibers in this application do not reach 2192°F (1200°C).
*Reference Dyson, D., Butler, M., Hughes, R., Fisher, R., and Hicks, G. The Devitrification of Alumino- silicate Ceramic Fiber Materials - The Kinetics of the Formation of Different Crystalline Phases, Ann. Occup. Hyg. Vol. 41, No. 55, 1997.
**Reference I.A.R.C. Monograph 68, June 1997.
NOTE:
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 guides.
REMOVAL OF COMBUSTION CHAMBER LINING OR BASE PANELS:
•Avoid breathing dust and contact with skin and eyes.
•Use NIOSH certified dust respirator (N95) (http://www.cdc.gov/niosh/homepage.html).
•Lightly mist with water (only those areas being handled) the combustion chamber lining or base insulation to prevent airborne fibers.
•Remove combustion chamber lining or base insulation from the boiler 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.38A )
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 roll- out/interlock switch, see Figure 32, page 23.
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.
Remove the combustion chamber door. Use caution to prevent damage to burners, refractory, pilot or wiring.
INSPECTION AND CLEANING
j.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:
k.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.
l.Remove gas manifold as described in steps a. thru e. in “Heat Exchanger/Burner Access.”
m.Loosen mounting screws and remove front control panel.
n.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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