I-UDSA-UK (02-19) PN 06 00116 UDSA R3, page 19
Figure 14 : Burner removal steps
2. Remove screws attaching burner
1. Disconnect manifold
at orifice and outside the
heater, slide to the right
3. Venturi tube : slide right,
rotate outwards, pull out
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 thoroughly 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.
Reinstall the burner
Repeat ‘Burner removal’ steps above in the opposite order.
Ignitor:
See Figure 11a and locate the ignitor. Disconnect the
wire; remove the screw and the ignitor. Clean the ignitor as-
sembly 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.
The burner orifice normally needs to be replaced only when a
change in gas is made. When ordering a replacement orifice,
provide (MJ/m
3
) heating value and specific gravity of gas, as
well as the model and serial number of the unit. When remov-
ing or replacing the burner orifice be careful not to damage the
venturi tube and/or the bracket.
Figure 15 :
Inspect and clean the burner
BURNER ORIFICE
16
IGNITION SYSTEM
Figure 16a : Ignitor showing required spark gap
measurement
Caution : Due to high voltage on the spark wire and
electrode, do not touch when energized.
Figure 16b : Flame sensor
17
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 exchanger section. With the light shining into
the heat exchanger, observe the outside 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 regions, replace the heat exchanger.
