71
The combustion chamber insulation in this product 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).”
• 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 job site conditions. Current NIOSH recommendations can be found on the
NIOSH website:
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 dust.
• Wash potentially contaminated clothes separately from other clothing. Rinse clothes washer
thoroughly.
NIOSH stated First Aid.
• Eye: Irrigate immediately.
• Breathing: Fresh air.
B. COMBUSTION CHAMBER COIL CLEANING INSTRUCTIONS FOR HEATER
*Before beginning this procedure, you must have on hand the following items:
• a nylon, stainless steel, or brass brush (not steel)
• lime scale removing solution, approved for use with stainless steel
• gloves and eye protection
1. Shut down the boiler by using the following steps:
a. Close the gas valve, shut down the unit, and wait for the unit to be cool to the touch.
b. Disconnect the condensate piping from the outside connection, (not from the boiler side), so
flow from condensate reservoir can be observed.
c. Disconnect electrical connections from the gas valve, spark electrode and flame rectification
probe and combustion blower.
d. Remove the (4) screws on the aluminum ¾” NPT connector on the right side of the gas valve.
e. Disconnect the wiring connected to the combustion blower motor.
f. Remove the (6) 10MM nuts from the burner plate assembly.
Figure 31
g. Pull the entire burner plate assembly with blower still attached towards you, while removing or
pushing aside any wiring to allow the removal of the assembly.
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