83
EN
7.3.5
Adjusting the combustion
The burners leave the factory calibrated on the basis of the indications of the paragraph “Adjusting the burner at various installation
If the outdoor temperature is such that it may influence combustion, we recommend adjusting the Co
2
according to the following
diagram.
CO
2
(%)
During winter, set a lower CO
2
value. In the warmer
periods of the year, set a higher CO
2
value.
1% increase of Co
2
every 20°C of
room temperature increase.
0
5
-5
10
15
20
25
11,00
11,50
12,00
12,50
13,00
13,50
30
Intake air temperature (°C)
Fig. 51
7.4
Checks
After the start-up, check that the
DUETTO HE EV
thermal unit
performs a lock-out and switches back on. To do this:
– modify the calibration of the heating thermostat
– adjust the room thermostat or the time programmer
– check that the green LED of the pump is lit
– check that the thermal unit locks out completely by shifting
the system’s main switch and the device’s main switch to
“off”.
If all the conditions are fulfilled, restart the thermal unit and
analyse the combustion by-products.
7.5
Shutdown
7.5.1
Temporary shutdown
If the user is away temporarily, for a weekend, short trip etc and
if the outside temperature is at ZERO:
– press the main switch (8) to switch off the thermal unit
8
1
0
Fig. 52
– close the fuel and water circuit shut-off valves.
Fig. 53
7.5.2
Shutting down for long periods
If the thermal unit is not used for an extended period of time, the
following operations must to be carried out:
– press the main switch (8) to switch off the thermal unit
– close the fuel and water circuit shut-off valves
– set the main system switch to "OFF"
– drain the system if there is the risk of freezing.
OFF
Fig. 54
m
CAUTION
In case of difficulties in completing the described pro-
cedure, contact professionally qualified personnel.
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