23
GB
4.5 Electrodes settings
(Page 13)
To have access to the electrodes carry out operations as de-
scribed in chapter “5.2 or 5.8 Recommended nozzles ”.
Lean the diffuser disc-holder assembly (1) on the nozzle-holder
(2) and lock it with screw (3).
For prospective adjustments of the electrodes assembly (4), lo-
osen screw (5), (see fig. 13).
5. WORKING
BURNERS CRONO 2 - 3 - 5 - 10 e 15-L
5.1 Combustion adjustment.
In conformity with Efficiency Directive 92/42/EEC the applica-
tion of the burner on the boiler, adjustment and testing must be
carried out observing the instruction manual of the boiler, inclu-
ding verification of the CO and CO
2
concentration in the flue
gases, their temperatures and the average temperature of the
water in the boiler.
To suit the required appliance output, choose the proper nozzle
and adjust the pump pressure, the setting of the combustion
head, and the air damper opening in accordance with the fol-
lowing schedule at page 14.
The values shown in the table refer to 12.5% CO
2
at sea level
and with light oil and room temperature of 20 °C.
5.2 Recommended nozzles :
Delavan type W–B.
To fit the nozzles, proceed as follows:
(See fig. 14, page 15)
y
Remove nozzle-holder assembly (1) after loosening
screws (2) and nut (3), remove the small cables (4) from
the control box, the photoresistance (6) and the socket (10)
for CRONO 2-L, 3-L and 5-L burners.
y
Withdraw the small cables (4) from the electrodes, remove
the diffuser disc-holder assembly (11) from the nozzle-hold-
er assembly (1) after loosening screw (3, fig. 13, page 13).
y
Screw the nozzle (12) correctly and tighten it as shown in
the figure.
Attention:
During reassembly of the nozzle-holder assembly
screw the nut (3) as shown in figure 15, page 15.
5.3 Pump pressure
The pump leaves the factory set at 12 bar.
To change it act on pump pressure adjust screw (5, fig. 7, page 9).
5.4 Combustion head setting
(CRONO 5–L, 10–L e 15–L)
(Fig. 14, page 15)
It depends on the output of the burner and is carried out by rota-
ting the setting screw (5) clockwise or anti-clockwise until the
set-point marked on the regulating rod (9) is level with the outsi-
de plane of the nozzle-holder assembly (1).
– In the sketch the combustion head is set for an output of
0.85 GPH at 12 bar (bruciatore CRONO 5-L).
The set-point 3 of the regulating rod (9) is at the same level with
the outside plane of the nozzle-holder assembly (1) as shown
in the schedule pag. 14.
5.5 Air damper adjustment
(Fig. 14, page 15)
– To vary the setting adjust the screw (7) after loosening the
nut (8).
– When the burner shuts down the air damper automatically clo-
ses until a max. chimney depressure of 0.5 mbar.
5.6 Fuel heating
(CRONO 2–L, 3–L e 5–L)
In order to assure regular ignition and working also at low tem-
perature the burner has an oil pre-heater fitted in combustion
head. The pre-heater starts when thermostats close.
When the required temperature for ignition is reached the ther-
mostat fitted on the nozzle holder starts the burner.
The pre heater remains energised during working and cuts out
when the burner shuts-down.
BURNER CRONO 20-L
5.7 Combustion adjustment.
In conformity with Efficiency Directive 92/42/EEC the applica-
tion of the burner on the boiler, adjustment and testing must be
carried out observing the instruction manual of the boiler, inclu-
ding verification of the CO and CO
2
concentration in the flue
gases, their temperatures and the average temperature of the
water in the boiler.
To suit the required appliance output, choose the proper nozzle
and adjust the pump pressure, the setting of the combustion
head, and the air damper opening in accordance with the fol-
lowing schedule at page 15.
The values shown in the table refer to 12.5% CO
2
at sea level
and with light oil and room temperature of 20 °C.
5.8 Recommended nozzles:
Delavan type W–B.
To fit the nozzles, proceed as follows:
(See Fig. 16, page 16)
y
Remove nozzle-holder assembly (1) after loosening
screws (2) and nut (3), remove the small cables (4) from
the control box and the photoresistance (5).
y
Withdraw the small cables (4) from the electrodes, remove
the diffuser disc-holder assembly (8) from the nozzle-holder
assembly (1) after loosening screw (3, fig. 13, page 13).
y
Screw the nozzle (9) correctly and tighten it as shown in
the figure.
Attention:
During reassembly of the nozzle-holder assembly
screw the nut (3) as shown in figure 17, page 16.
5.9 Combustion head setting
(Fig. 16, page 16)
It depends on the output of the burner and is carried out by rota-
ting the setting screw (6) clockwise or anti-clockwise until the
set-point marked on the regulating rod (7) is level with the outsi-
de plane of the nozzle-holder assembly (1).
– In the sketch the combustion head is set for an output of 0.85
GPH at 12 bar. The set-point 2.5 of the regulating rod (7) is at
the same level with the outside plane of the nozzle-holder as-
sembly (1) as shown in the schedule pag. 15.
Summary of Contents for CRONO 10-L
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