Dunkirk DXL Series User Manual

Page 20

Make visual check of main burner and pilot fl ames at start

of heating season and again in mid-season. Main burner

fl ame should have well defi ned inner blue mantel with

lighter blue outer mantel. Check burner throats and burner

orifi ces for lint or dust obstruction. See Figures 17 and 19.

Pilot fl ame should envelop ⅜ to ½ inch of tip of pilot

thermocouple, ignition/sensing electrode or mercury

sensor. See Figure 19 .

To adjust pilot fl ame, remove pilot adjustment cover screw
and turn inner adjustment screw counterclockwise

increase or clockwise

to decrease pilot fl ame.

Be sure to replace cover screw after adjustment to prevent

possible gas leakage. See Figure 14, Page 16 .
Burners and pilot should be checked for signs of corrosion,

rust or scale buildup.
Area around boiler must be kept clear and free of

combustible materials, gasoline and other fl ammable

vapors and liquids.
Free fl ow of combustion and ventilating air to boiler and

boiler room must not be restricted or blocked.
Inspect fi eld sourced low water cutoffs annually, or as

recommended by low water cutoff manufacturer. Flush

fl oat type low water cutoffs per manufacturer's instructions.
Employ a qualifi ed service agency to make annual

inspection of boiler and heating system. They are

experienced in making the inspections outlined above,

and, in event repairs or corrections are necessary, trained

technicians can make the proper changes for safe operation

of the boiler.

15 - GENERAL INSTRUCTIONS

Figure 18 - Gas Burner Flame

Figure 19 - Gas Burner Pilot

Figure 20 - Combustion Chamber

BURNERS

ORIFICES

GAS VALVE