27
OPTIMAX HE PLUS 25 S
Cod. 3540R540 - 02/2009 (Rev. 00)
fig. 24
B
A
C
A
eco
com
fort
res
et
1
2
3
4
0
BAR
Air
Flue gas
Air Flue gas
fig. 25
Opening the casing
To open the boiler casing, you need to follow the sequence given below
and the instructions of fig. 24.
1
Using a screwdriver, fully unscrew and remove the 2 screws
“A ”
2
Open by lowering the panel
“B ”
3
Lift and take off the casing
“C ”
Cleaning the boiler and burner
The body and burner must not be cleaned with chemical products or wire brushes. Special care must
be taken over all the sealing systems pertaining to the sealed chamber (gaskets, cable clamps, etc.). In
addition, it is necessary to pay attention after performing all these operations to check and carry out all
the phases of ignition and thermostat operation, the gas valve and circulation pump.
After these checks, make sure there are no gas leaks.
Combustion analysis
It is possible to analyse the combustion
through the air and flue sampling points
shown in fig. 25.
To make the measurement, it is necessary
to:
1)
Open the flue sampling point
2)
Insert the probe;
3)
Press CH button
(part. 3, 4 - fig. 1)
for 5 seconds to turn on TEST mode;
4)
Wait 10 minutes for the boiler to stabi-
lize
5)
Take the measurement.
NAT GAS; CO2 reading should be 8.7 to 9.0%
L.P.G; CO2 reading should be 9.5 to 10%
Readings taken with an unstabilized boiler will cause measurement errors.
