Technical data

0803UDSA-2GBEN, Pag. 27/36

Inspect and clean the burner

Reinstall the burner

Repeat ‘Burner removal’ steps above in the opposite order.

Ignitor - Refer to figure 11a and locate the ignitor. Disconnect the wire; remove

the screw and the ignitor. Clean the ignitor assembly with an emery cloth.

Spark gap must be maintained to 3 mm. See FIGURE 16a.

Important : When reassembling, the wire must remain attached to the ignitor.

17. Ignition system

16. Burner orifice

The burner orifice normally needs to be replaced only when a change in gas is

made. When ordering a replacement orifice, provide (MJ/m

) heating value and

specific gravity of gas, as well as the model and serial number of the unit. When

removing or replacing the burner orifice be careful not to damage the venturi tube

and/or the bracket.

Figure 15

With the burner assembly removed, shine a flashlight on the burner ribbons. Look

for carbon buildup, scale, dust, lint, and/or anything that might restrict flow through

the spaces between the burner ribbons. Holding the burner assembly so that any

foreign material will fall away from the burner, use a stiff bristle brush to loosen

and remove any foreign material(s). If the burner is excessively dirty, remove one

of the burner end caps. Remove the four screws that hold the end cap to the burner

housing. Lightly tap the end cap to remove it.

Clean all foreign material from the burner and venturi. After the burner is thor-

oughly clean, replace the end cap making certain that it is tight against the burner

housing. NOTE: If any of the burner components are damaged or deteriorated,

replace the burner assembly.

Inspect the Internal Portion of the Heat Exchanger (with burner

assembly removed)

At the burner flame entrance of each tube, shine a bright light into each heat ex-

changer section. With the light shining into the heat exchanger, observe the out-

side surface of the tube where discoloration is evident. Repeat this procedure with

each heat exchanger tube. If any light is observed in these high temperature re-

gions, replace the heat exchanger.