2916050
16
GB
Installation
4.7
Nozzle
The burner complies with the emission requirements of the UL 296
Standard.
In order to guarantee that emissions do not vary, recommended
and/or alternative nozzles specified by the manufacturer in the In-
struction and warning booklet should be used.
4.7.1
Recommended nozzles
Type A4 return flow nozzles - 45° angle
4.7.2
Nozzle assembly
At this stage of installation the burner is still disassembled from the
blast tube; it is therefore possible to fit the nozzle with the box
wrench 1)(Fig. 10), inserting the wrench through the central hole in
the flame stability disk.
Finally remount the burner 3)(Fig. 11) on the slide bars 2) and slide
it up to the flange 5), keeping it slightly raised to prevent the flame
stability disk from pressing against the blast tube.
Tighten the screws 1) on the slide bars 2) and screws 4) fixing the
burner to the flange.
If it proves necessary to change a nozzle with the burner already
fitted to the boiler, proceed as outlined below:
pull back the burner on its slide bars as shown in Fig. 8;
remove the nuts 1)(Fig. 12) and the disk 2);
use wrench 3)(Fig. 12) to change the nozzles.
4.7.3
Choice of nozzle
In case an intermediate delivery between the two values indicated
in the diagram (Fig. 13) is required, a nozzle with higher delivery
must be chosen.
NOTE:
the values indicated in the right side of the diagram (Fig. 13),
refer to the data printed on the nozzle.
Delivery reduction will be obtained by means of the pressure regu-
lator.
WARNING
It is advisable to replace nozzles every year during
regular maintenance operations.
CAUTION
The use of nozzles other than those specified by the
manufacturer and inadequate regular maintenance
may result into emission limits non-conforming to
the values set forth by the regulations in force, and
in extremely serious cases, into potential hazards to
people and objects.
The manufacturing company shall not be liable for
any such damage arising from nonobservance of
the requirements contained in this manual.
WARNING
Do not use any sealing products such as gas-
kets, sealing compound, or tape.
Be careful to avoid damaging the nozzle seal-
ing seat.
Fig. 10
D1220
D1221
Fig. 11
D1222
Fig. 12
D2355
Fig. 13
N
ozzl
e fl
ow
rat
e
-
GPH
Return pressure -
PSI
