ATLAS D
24
EN
cod. 3540S131 - 12/2009 (Rev. 00)
Turning the boiler off
Press the 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 and heating operation are disabled. The antifreeze system remains
activated.
To relight the boiler, press the button (detail 9 fig. 1) again for 1 second.
fig. 7
The boiler will be immediately ready to operate whenever domestic hot water is drawn
or in case of a room thermostat demand.
2.4 Adjustments
Summer/Winter changeover
Press the button (detail 6 - fig. 1) for 1 second.
fig. 8
The display activates the Summer symbol (detail 27 - fig. 1): the boiler will only deliver
domestic hot water. The antifreeze system remains activated.
To deactivate Summer mode, press the button (detail 6 - fig. 1) again for 1 second.
Heating temperature setting
Operate the heating buttons (details 3 and 4 - fig. 1) to adjust the temperature from a
min. of 30°C to a max. of 90°C; it is advisable not to operate the boiler below 45°C.
fig. 9
Hot water temperature adjustment
Operate the DHW buttons (details 1 and 2 - fig. 1) to adjust the temperature from a min.
of 10°C to a max. of 65°C.
fig. 10
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 read by the probe. The boiler control system op-
erates with "Sliding Temperature”. In this mode, the temperature of the heating system
is controlled according to the outside weather conditions, to ensure high comfort and en-
ergy saving throughout the year. In particular, as the outside temperature increases the
system delivery temperature decreases 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 the 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 button mode (detail 10 - fig. 1) once to display the 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 button mode (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.
fig. 13 - Compensation curves
fig. 14 - Example of parallel compensation curve shift
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