Operating instructions

1104UESAGBEN, page 25/31

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

Figure 20

Reinstall the burner

11.2.3 Burner jet

The burner jet normally needs to be replaced only when a change in gas is made.

When ordering a replacement oriﬁ ce, provide (MJ/m3) heating value and speciﬁ c

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

ing or replacing the burner jet be careful not to damage the venturi tube and/or the

bracket.

Ignitor - Refer to ﬁ gure 16a 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.

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

Inspect the internal portion of the heat

exchanger (with burner assembly re-

moved).

At the burner ﬂ ame entrance of each

tube, shine a bright light into each heat

exchanger section. With the light shin-

ing into the heat exchanger, observe the

outside surface of the tube where dis-

coloration is evident. Repeat this pro-

cedure with each heat exchanger tube.

If any light is observed in these high

temperature regions, replace the heat

exchanger.

11.2.4 Ignition system

Figure 21

Ignitor showing required

spark gap measurement

Figure 22

Flame sensor

CAUTION

Due to high voltage on

the spark wire and elec-

trode, do not touch when

energized.

Flame sensor : Refer to ﬁ gure 16a and locate the ﬂ ame sensor. Disconnect the

wire, remove the screw and the ﬂ ame sensor. Clean with an emery cloth.