3159
7
4.3 AIR DAMPER SETTING
1
D5231
2
2
The regulation of the air-rate is made by adjusting the air damper
(1)
, after loosing the screws
(2)
.
When the optimal regulation is reached,
screw tight the screws (2)
.
4.4 COMBUSTION CHECK
CO
2
It is advisable to not exceed 10% of CO
2
(natural gas)
, in order to avoid the risk that small changes of the
adjustments due, for instance, at draught variation, may cause combustion with insufficient air and consequently
formation of CO.
CO
- Not exceeding 100 mg/kWh (93 ppm).
IONIZATION CURRENT
The minimum current necessary for the control box operation is 3 µA.
The burner normally supplies a higher current value, so that no check is needed. However, if you want to meas-
ure the ionization current, you must open the connector fitted to the red wire and insert a microammeter.
SO
CN1
Terminal strip
of control-box
D5006
4.5 BURNER START-UP CYCLE
3s
40s
40s
max. 2s
max. 2s
D4172
Lock-out, due to ignition failure
Normal
Thermostat
Motor
Ignition transformer
Valves
Flame
Lock-out
When flame-failure occurs during working, shut down takes place within one second.
