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FA ROTEX A1 BOe - 02/2014
7
x
Oil burner
7.3.5 Recirculation gap
The recirculation gap is set to a fixed value of 2.0 mm and must
not be changed. For this reason, the adjusting screw (fig. 7-6,
pos. 1) is covered with a plug.
Turning the adjusting screw (fig. 7-6, pos. 1) effects an axial dis-
placement of the mixer device in the recirculation tube (see
fig. 7-7).
7.3.6 Check and set electrode distance and the
distance between oil nozzles and air nozzles
Checking and setting electrodes distance
Tools required
: Setting gauge (fixed on the retainer for the
service position)
Ɣ
Bring burner in service position (see section 7.4.1).
Ɣ
Check electrode distance and position with the setting gauge.
Ɣ
If necessary, readjust electrodes by bending them.
Setting the oil nozzle - air nozzle distance
Tools required
: Setting gauge (fixed on the retainer for the
service position) Allen key SW 4 mm;
Ɣ
Bring burner in service position (see section 7.4.1).
Ɣ
Check distance with setting gauge. For setting values refer to
tab. 7-1.
Ɣ
To adjust, loosen the fixing screw and push the mixing device
on the nozzle rod (also refer to fig. 9-16 in chapter 9.2.8).
1
Adjustment screw recirculation tube
2
Scale recirculation gap
Fig. 7-6
Positioning recirculation tube
1
Recirculation gap
2
Flame tube
3
Recirculation tube
Fig. 7-7
Flame tube and recirculation gap
The scale (fig. 7-6, pos. 2) shows the set width of the
recirculation gap (in mm). If the nozzle tube or the oil
preheater are changed or an oil nozzle type different
from the regular production type is used, there can be a
difference between the scale display and the actual
width of the recirculation gap.
a
Mixing unit
b
Ignition electrodes
c
Fixing screw
d
Light tube
e
Oil nozzle
f
Air nozzle
g
Nozzle rod
h
Setting gauge
X1
Electrode position BLB 15e,
BLB 20e and BLB 27e
X2
Electrode position BLB 35e
Y
Distance oil nozzle - air nozzle
Fig. 7-8
Check electrode setting and distance oil nozzle - air nozzle
If the ignition electrodes are worn out, they must be
replaced.
Notes on replacing the ignition electrodes are given in
chapter 9.2.8.
CAUTION!
Wrong distance setting can cause unclean burning,
bad starting behaviour and increased burner wear.
Ɣ
Use the correct side of the feeler gauge.
