Installing a Conversion Gas Burner
The conversion gas burners illustrated in Figures 16-13 and 16-14 are used to convert coal-fired or oil-fired central heating plants to gas. They are adaptable for use in forced-warm-air furnaces, gravity (updraft) furnaces, or boilers (Figures 16-15 through 16-18).
In addition to the basic combustion chamber requirements (see the appropriate section in this chapter), the following recommendations must be followed when installing a conversion gas burner.
1. The diameter of the burner opening into the combustion chamber must not be oversize. If the opening is oversize, slip the stainless steel sleeve (included with the burner) over the nozzle and fill in the remaining space with refractory cement.
2. Position the end of the burner nozzle so that it is at least 1 inch short of the inside surface of the combustion cham- ber. Never allow the nozzle to extend into the combustion chamber.
3. If the burner nozzle is too short to reach the combustion chamber, it may be lengthened with an extension tube.
4. Check the burner ports and pilot before permanently setting the burner in place, and remove any foreign matter blocking the openings.
SUPPLY RETURN
In warm-air furnaces protect the heat exchanger surfaces from direct flame contact
