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Turning the boiler off
Press the on/off button (detail 9 - fig. 1) for 1 second.
fig. 6 - Turning the boiler off
When the boiler is turned off, the electronic board is still powered.
Domestic hot water (with optional hot water tank installed) and heating operation are disabled.
To relight the boiler, press the on/off button (detail 9 fig. 1) again for 1 second.
The boiler will be immediately ready to operate whenever domestic hot water is drawn
(with optional hot water tank installed) or in case of a room thermostat demand.
2.4 Adjustments
Summer/Winter Switchover
Press the Summer/Winter button (detail 6 - fig. 1) for 1 second.
The display activates the Summer symbol (detail 27 - fig. 1): The boiler will only deliver
domestic hot water (with optional hot water tank installed). The antifreeze system re-
mains activated.
To deactivate Summer mode, press the Summer/Winter button (detail 6 - fig. 1) again
for 1 second.
Heating temperature adjustment
Use the heating buttons (details 3 and 4 - ) to adjust thefig. 1temperature from a min.
of 30°C to a max. of 85°C; it is advisable not to operate the boiler below 45°C.
DHW temperature adjustment (with optional hot water tank installed)
Operate theDHW buttons (details 1 and 2 - fig. 1) to adjust the temperature from a min.
of 10°C to a max. of 65°C.
30
EN
eco
bar
fig. 7
eco
bar
fig. 8
eco
bar
fig. 9
eco
bar
fig. 10
cod. 3540S840 - 02/2010 (Rev. 00)
DIVAtop HC
Room temperature adjustment (with optional room thermostat)
Using the room thermostat, set the temperature desired in the rooms. If the room ther-
mostat is not installed the boiler will keep the heating system at its setpoint temperature.
Room temperature adjustment (with optional remote timer control)
Using the remote timer control, set the temperature desired in the rooms. The boiler unit
will set the system water according to the required room temperature. For information on
the remote timer control, please refer to its user's manual.
Sliding Temperature
When the optional external probe is installed, the control panel display (detail 5 - fig. 1)
shows the actual outside temperature detected by the probe. The boiler control system
operates with "Sliding Temperature". In this mode, the heating system temperature is ad-
justed according to the outside weather conditions, to ensure high comfort and energy
saving throughout the year. In particular, as the outside temperature increases, the heat-
ing system delivery temperature is decreased according to a specific "compensation
curve".
With Sliding Temperature adjustment, the temperature set with the heating buttons (de-
tails 3 and 4 - fig. 1) becomes the maximum system delivery temperature. It is advisable
to set a maximum value to allow system adjustment throughout its useful operating
range.
The boiler must be adjusted at the time of installation by qualified personnel. Adjust-
ments can in any case be made by the user to improve comfort.
Compensation curve and curve offset
Press the mode button (detail 10 - fig. 1) once to display the actual compensation curve
(fig. 11), which can be modified with the DHW buttons (details 1 and 2 - fig. 1).
Adjust the required curve from 1 to 10 according to the characteristic (fig. 13).
By setting the curve to 0, sliding temperature adjustment is disabled.
fig. 11 - Compensation curve
Press the heating buttons (details 3 and 4 - fig. 1) to access parallel curve offset
(fig. 14), modifiable with the DHW buttons (details 1 and 2 - fig. 1).
fig. 12 - Parallel curve offset
Press the mode button (detail 10 - fig. 1) again to exit parallel curve adjustment mode.
If the room temperature is lower than the required value, it is advisable to set a higher
order curve and vice versa. Proceed by increasing or decreasing in steps of one and
check the result in the room.
90
85
80
70
60
50
40
30
20
20
10
fig. 13 - Compensation curves
OFFSET = 20
90
10
9
8
7
85
6
80
5
70
4
60
3
50
2
40
1
30
20
20
10
0
-10
-20
fig. 14 - Example of compensation parallel curve offset
10
9
8
7
6
5
4
3
2
1
0
-10
-20
OFFSET = 40
90
10
9
8
7
6
85
80
70
60
50
40
30
20
20
10
0
-10
5
4
3
2
1
-20
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