6.8
BURNER START-UP CYCLE
Limit thermostat
Safety thermostat
Motor
{
2
Servomotor
1
0
Ignition transformer
Valve
nd
2
flame
st
1
flame
7.
MAINTENANCE
The burner requires periodic maintenance carried out by a qualified and authorised technician in conform-
ity with legislation and local standards.
Maintenance is essential for the reliability of the burner, avoiding the excessive consumption of fuel and
consequent pollution.
Before carrying out any cleaning or control always first switch off the electrical supply to the
burner acting on the main switch of the system.
THE BASIC CHECKS ARE:
Leave the burner working without interruptions for 10 min. and checking the right 1 st and 2 nd stage
settings of all the components stated in this manual.
Then carry out a combustion check verifying:
Content of CO
(%)
2
Content of CO (ppm)
Flue gas temperature (°C)
2930
24s
2.5s
15 − 25s
38s
3s
11s
14 GB
D4435
11s
3s max.