Beretta MYNUTE X C Series Installer And User Manual page 16

MYNUTE X
4.4 Setting the thermoregulation
Enabling THERMOREGULATION occurs in the following way:
ƒ access the technical parameters menu, as indicated in the paragraph "3.22 Access to
the parameters"
ƒ select the menu P4 and then P4.18 = 1.
Thermoregulation only works with the outdoor temperature sensor connected and active only
for the HEATING function. If P4.18 = 0 or outdoor temperature probe disconnected the boiler
operates at a fixed point. The temperature measured by the outdoor temperature sensor is
displayed in "4.20 INFO menu" under I0.09. The thermoregulation algorithm will not directly
use the outdoor temperature, but rather a calculated outdoor temperature that takes into
account the building's insulation: in buildings that are well insulated, the outdoor temperature
variations will have less impact than those that are poorly insulated by comparison.
REQUEST FROM OT CHRONOTHERMOSTAT
In this case the delivery setpoint is calculated by the chronothermostat according to the
outdoor temperature value and the difference between the ambient temperature and the
desired ambient temperature.
REQUEST FROM ROOM THERMOSTAT
In this case the delivery setpoint is calculated by the adjustment board according to the
outdoor temperature value so as to obtain an estimated outdoor temperature of 20°
(reference ambient temperature).
There are 2 parameters that compete to calculate the output setpoint:
ƒ slope of the compensation curve (KT)
ƒ offset on the reference ambient temperature.
Selecting the thermoregulation curve (parameter P4.19 - fig. 20)
The thermoregulation curve for heating maintains a theoretical temperature of 20°C
indoors, when the outdoor temperature is between +20°C and -20°C. The choice of the
curve depends on the minimum outdoor temperature envisaged (and therefore on the
geographical location), and on the delivery temperature envisaged (and therefore on the
type of system). It is carefully calculated by the installer on the basis of the following formula:
KT = T. outlet envisaged - Tshift
20- min. design external T
Tshift = 30°C standard system
25°C floor installations
If the calculation produces an intermediate value between two curves, you are advised to
choose the thermoregulation curve nearest the value obtained.
Example: if the value obtained from the calculation is 1.3, this is between curve 1 and curve
1.5. Choose the nearest curve, i.e. 1.5.
The settable KT values are as follows:
ƒ standard system: 1.0-3.0
ƒ floor system 0.2-0.8.
Through the interface it is possible to access the menu P4 and the parameter P4.19 to set the
pre-selected thermoregulation curve:
ƒ access the technical parameters menu, as indicated in the paragraph "3.22 Access to
the parameters"
ƒ select the menu P4 and then P4.19
ƒ press the key to confirm
ƒ set the desired climatic curve with the
Enter
ƒ confirm with .
OFFSET ON THE REFERENCE AMBIENT TEMPERATURE (fig. 20)
The user can, in any event, indirectly intervene on the value of the HEATING setpoint
setting, with reference to the reference temperature (20°C), an offset within the range -5 -
+5 (offset 0 = 20°C). For correcting the offset see the paragraph "4.8 Adjusting the heating
water temperature with an outdoor temperature sensor connected".
NIGHT COMPENSATION (parameter P4.20 - fig. 20)
If a ROOM THERMOSTAT is connected to a programming timer, from the menu P4
parameter P4.20 the night compensation can be enabled.
To set the night compensation:
ƒ access the technical parameters menu, as indicated in the paragraph "3.22 Access to
the parameters"
ƒ select the menu P4 and then P4.20
ƒ press the key to confirm
ƒ set the parameter to 1
Enter
ƒ confirm with .
In this case, when the CONTACT is CLOSED, the heat request is made by the flow sensor,
on the basis of the outdoor temperature, to obtain a nominal ambient temperature on DAY
level (20°C). The opening of the contact does not produce a switch-off, but a reduction
(parallel translation) of the climatic curve on NIGHT level (16°C). Also in this case, the user
can indirectly modify the value of the HEATING setpoint inserting once again an offset on
the reference DAY temperature (20°C) rather than NIGHT (16°C) that can vary within the
range [-5 - +5]. For correcting the offset see the paragraph "4.8 Adjusting the heating water
temperature with an outdoor temperature sensor connected".
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and arrow keys
4.5 First commissioning
ƒ Position the system's master switch to the "on" position.
ƒ Open the gas tap to allow fuel to flow.
ƒ With power on the backlight comes on, then all the icons and the segments come on for 1sec
and in sequence the firmware revision is displayed for 3sec:
ƒ Then the interface displays the status active at that moment.
Vent cycle
b
Each time that the boiler is powered, an automatic vent cycle is carried out lasting 4
min. When the air purging cycle is in progress all heat requests are inhibited except
those for domestic hot water when the boiler is not set to OFF and -AIR is displayed
on the interface screen.
The purge cycle can be interrupted early by keeping key 2 (the icon RESET comes on).
The purge cycle can also be interrupted, if the boiler is not set to OFF, by a domestic hot
water request.
ƒ Adjust the ambient temperature thermostat to the desired temperature (~20°C) or, if the
system is equipped with a programmable thermostat or timer, ensure that the thermostat
or timer is "active" and set correctly (~20°C).
ƒ Then set the boiler on WINTER or SUMMER depending on the type of operation desired.
ƒ The boiler will start up and continue working until the set temperatures are reached,
after which it will then go back to standby.
4.6 Operating status
For changing the operating status from WINTER to SUMMER to OFF press key 1 until the
icon for the desired function is displayed.
WINTER MODE
ƒ Set the boiler to the WINTER status by pressing key 1 until both the domestic hot water
icon and the heating icon are displayed.
The interface normally displays the delivery temperature unless there is a domestic hot
water request in progress, in which case the domestic hot water temperature is displayed.
ƒ When there is a heat request and the boiler is igniting, the icon
display.
Heating REQUEST, the radiator icon blinks:
appears on the
Bar