2126
10
GB
OPERATION
Air bleed
: through the screw provided on the gas pressure switch
COMBUSTION CHECK
CO
2
It is essential to adjust the burner with a CO
2
not higher than 10% c.a. (gas with Pci 8600 kcal/m
3
).
By doing so, a small miscalibration
(for instance a change in draft)
can not cause combustion with air
deficiency and consequent formation of CO.
CO
-
It must not be higher than 100 mg/kWh (93 ppm) in compliance with EN 676.
It is important to take into account that the fan air output var-
ies according to whether the burner’s cover is fitted or not.
Proceed as follows:
– adjust the air damper;
– fir the cover and check the bacharach values (CO
2
- CO);
– if necessary, change the air flow, remove the cover, adjust the
gate valve, refit and check the values again.
NOTE:
When the burner runs with an output higher than 95
kW (80.000 kcal/h), remove the panel fitted within the
cover
(see figure on the right)
.
START-UP CYCLE
If the flame goes out during operation, a lock-out takes place within 1 second.
GAS PRESSURE SWITCH
For any adjustment see the instructions for
the gas train.
AIR PRESSURE SWITCH (7, fig. 1)
(factory-set at 0.5 mbar).
Screw
Connection for pressure
measurement
Air pressure switch
PANEL
S7362
Normal
Lock-out, due to light-failure
Thermostat
Motor
Ignition transformer
Valve (oil - gas)
Flame
Lock-out lamp
1s
3s max.
D5840
1s
3s max.
30s min.
30s min.
