VENUS BA MS 24- 34
19
EN
cod. 3541I710 - Rev. 00 - 06/2016
Turning the boiler off and on
Press the
On/Off button
(detail 7 - fig. 1) again for 5 seconds.
fig. 7 - Turning the boiler off
When the boiler is turned off, the PCB is still powered. Domestic hot water and heating
are disabled. The frost protection system remains activated. To relight the boiler, press
the
On/Off button
(detail 7 - fig. 1) again for 5 seconds.
fig. 8
The boiler will be immediately ready to operate whenever domestic hot water is drawn
or in case of a room thermostat demand.
B
The frost protection system does not work when the power and/or gas to the
unit are turned off. To avoid damage caused by freezing during long shutdowns
in winter, it is advisable to drain all water from the boiler, the DHW circuit and
the heating system water; or drain just the DHW circuit and add a suitable an-
tifreeze to the heating system, as prescribed in sec. 3.3.
2.4 Adjustments
Summer/Winter Switchover
Press the
summer/winter
button (detail 6 - fig. 1) for 2 seconds.
The display activates the Summer symbol (detail 10 - fig. 1): the boiler will only deliver
domestic hot water. The antifreeze system remains activated.
To deactivate the Summer mode, press the
summer/winter
button (detail 6 - fig. 1)
again for 2 seconds.
Heating temperature adjustment
Use the heating buttons (details 3 and 4 - fig. 1) to adjust the temperature from a min. of
20°C to a max. of 80°C.
fig. 9
DHW temperature adjustment
Use the DHW buttons (details 1 and 2 - fig. 1) to adjust the temperature from a min. of
40°C to a max. of 55°C.
fig. 10
B
If little water is drawn and/or with a high water inlet temperature, the DHW
outlet temperature may differ from the set temperature.
Room temperature adjustment (with optional room thermostat)
Using the room thermostat, set the temperature required in the rooms. If the room ther-
mostat is not installed, the boiler will keep the system at the set system delivery setpoint
temperature.
Room temperature adjustment (with optional remote timer control)
Using the remote timer control, set the required temperature in the rooms. The boiler will
adjust the system water according to the required room temperature. For operation with
remote timer control, please refer to the relevant instruction manual.
ECO/COMFORT selection
The unit has a function that ensures a high domestic hot water delivery speed and max-
imum comfort for the user. When the device is activated (COMFORT mode), the water
contained in the boiler is kept hot, thereby ensuring immediate availability of hot water
on opening the tap, without waiting times.
The user can deactivate the device (ECO mode) by pressing the
eco/comfort
button
(detail 7 - fig. 1). In ECO mode the display activates the ECO symbol (detail 12 - fig. 1).
To activate the COMFORT mode, press the
eco/comfort
button (detail 7 - fig. 1) again.
Sliding Temperature
When the optional external probe is installed, the boiler adjustment system works 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 energy saving
throughout the year. In particular, the system delivery temperature is decreased as the
outside temperature increases, according to a specific "compensation curve”.
With Sliding Temperature adjustment, the temperature set with the heating buttons (de-
tail 3 - 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. Possible
adjustments can in any case be made by the user to improve comfort.
Compensation curve and curve offset
Press the
reset
button (detail 6 - fig. 1) for 5 seconds to access the "Sliding temperature"
menu; the display shows "CU" flashing.
Use the DHW buttons (detail 1 - fig. 1) to adjust the curve from 1 to 10 according to the
characteristic fig. 11. By setting the curve to 0, sliding temperature adjustment is disa-
bled.
Press the heating buttons (detail 3 - fig. 1) to access parallel curve offset; the display
shows "OF" flashing. Use the DHW buttons (detail 1 - fig. 1) to adjust the parallel curve
offset according to the characteristic (fig. 12).
Press the
reset
button (detail 6 - fig. 1) again for 5 seconds to exit the "Sliding Temper-
ature" menu.
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. 11
fig. 12 - Example of compensation parallel curve offset
Adjustments from Remote Timer Control
A
If the Remote Timer Control (optional) is connected to the boiler, the above ad-
justments are managed according to that given in table 1.
Table. 1
0
1
4
2
3
reset
eco
comfort
0
1
4
2
3
reset
eco
comfort
Heating temperature setting
Adjustment can be made from the Remote Timer Control menu and the boiler
control panel.
DHW temperature adjustment
Adjustment can be made from the Remote Timer Control menu and the boiler
control panel.
Summer/Winter Switchover
Summer mode has priority over a possible Remote Timer Control heating
demand.
Eco/Comfort selection
On disabling DHW from the Remote Timer Control menu, the boiler selects the
Economy mode. In this condition, the
eco/comfort
button (detail 7 - fig. 1) on the
boiler panel is disabled.
On enabling DHW from the Remote Timer Control menu, the boiler selects the
Comfort mode. In this condition it is possible select one of the two modes with
the
eco/comfort
button (detail 7 - fig. 1) on the boiler panel.
Sliding Temperature
Both the Remote Timer Control and the boiler card manage Sliding Temperature
adjustment: the boiler card Sliding Temperature has priority.
20
30
40
50
60
70
80
90
85
20
10
0
-10
-20
1
2
3
4
5
6
8
9
10
7
20
30
40
50
60
70
80
90
85
20
30
40
50
60
70
80
90
85
1
2
3
4
5
6
8
9
10
7
1
2
3
4
5
6
8
9
10
7
OFFSET = 20
OFFSET = 40
