Reznor UDSBD-4E, Установка, пусконаладка, обслуживание, Страница: 22 / 35

1801UDSBD-4E,--EN, Pag. 22/35
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 ex-
cessively 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.
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.
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.
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
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