Pump Pressure And Air Output; Burner Start-Up Cycle - Baxi CRONO 2-L Installations-, Montage Und Betriebsanleitung Für Den Installateur

5.10 Pump pressure and air output

The burner, in order to guarantee good smooth starts, irrespective
of the type of boiler, is fitted with a hydraulic device which, inde-
pendently of the control-box, reduces the fuel- and air-flow.
At ignition, the pressure at the nozzle is 9 bar.
After 3 - 9 seconds, it automatically increases to 12 bar.
The air-flow, initially adjusted to the low setting, is, at the change-
over of pressure, automatically brought to the air-flow required for
the big flame.
SETTING FOR THE LOW IGNITION-FLAME
Adjustment of air shutter
Unloosen the screw (8), by approximately one full turn; in this
way, the burner remains permanently on low flame.
Unloosen the nut (5), turn the screw (4) until the indicator (6)
reaches the position desired. Then lock the nut (5) and tighten
the screw (8).
6.

BURNER START-UP CYCLE

CRONO 2-L, 3-L, 5-L
Thermostat
Heating
Motor
Ignition transformer
Valve
Flame
Lock-out lamp
CRONO 10-L, 15-L
Thermostat
Motor
Ignition transformer
Valve
Flame
Lock-out lamp
CRONO 20-L
Thermostat
Motor
Ignition transformer
Valve
Low-flame
High-flame
Lock-out lamp
Lock out is indicated by a lamp on the control box (3, fig. 1, page 3).
C
(Fig. 18, page 16)
Normal
0 – 150s ~ 12s
Normal
~
12s
Normal
~
12s 3 – 9 s
Adjustment start delaying device
This is set at 9 bar in the factory.
The pressure gauge must be mounted in place of plug (4, fig.
7, page 9). Should it be necessary to re-set or alter such pres-
sure, this can be done, by adjusting screw (7), always after ha-
ving loosened screw (8).
HIGH-FLAME SETTING
Air-damper adjustment
Loosen the nut (3), turn the screw (1), until the indicator (2) is in
the required position. Then, lock the nut (3).
Pump-adjustment:
This is set in 12 bar in the factory.
The pressure gauge must be mounted in place of plug (4).
Should it be necessary to re-set or alter such pressure, this can
be done, by adjusting screw (5).
When the burner shuts down the air damper automatically clo-
ses until a max. chimney depressure of 0.5 mbar.
Lock-out due to failure to light
0 – 150s
Lock-out due to failure to light
~
12s
Blocco per mancata accensione
~
12s
GB
(Fig. 18, page 16)
(Fig. 19, page 16)
(Fig. 7, page 9)
C
~ 12s
D5023
5s
C
5 s
D5029
C
D5544
5 s
24