Beretta MYNUTE GREEN 28 C.S.I. Manual De Instalacion Y Uso página 17

13
SETTING THE THERMOREGULATION
.
Heat adjustment only works with the external probe connected,
therefore, after installation, connect the external probe to the rela-
tive connections on the boiler terminal board (fig. 48, page xxx).
This enables the THERMOREGULATION function.
Selecting the offset heating curve
The offset heating curve maintains a theoretical ambient tempera-
ture of 20°C at external temperatures ranging from +20°C to -
20°C. The choice of the curve depends on the rated minimum
external temperature (on the geographical area, therefore) and
the rated delivery temperature (on the type of system, therefore)
and must be carefully calculated by the fitter using the following
formula:
Nominal delivery T. - Tshift
KT=
20- min. rated external T.
Tshift = 30°C standard systems
25°C floor systems
If the calculation generates an intermediate value between two
curves, choose the nearest offset heating curve to that value.
E.g.: if the value obtained by the calculation is 1.3, it lies between
curve 1 and curve 1.5. In this case, select the nearest curve, i.e.:
1.5.
Select KT by turning the trimmer located under the domestic hot
water temperature knob (A, fig. 34).
The settable values of KT are:
standard system: 1,0-1,5-2,0-2,5-3,0
floor system: 0,2-0,4-0,6-0,8
THERMOREGULATION CURVES
EXTERNAL TEMPERATURE (°C)
T80 maximum heating temperature set point for std systems (jumper
pos. 1 not inserted)
T45 maximum heating temperature set point for floor systems (jumper
pos. 1 inserted)
display
Estate
KT
34
A
3,0 2,5 2,0
Off/Reset
Inverno
LA
CO
Inverno con
preriscaldo
B
C
TYPE OF HEAT REQUEST
If an ambient thermostat is connected to the boiler (parameter
51 = 0 - manufacturer's default setting)
The ambient thermostat makes a heat request when its contact
closes, while it stops it when its contact opens. Though delivery
temperature is automatically calculated by the boiler, the user may
manually override it. By modifying HEATING on the user interface
(C, fig. 34), the HEATING SET POINT will no longer be available
but just a value that can be set from +5 to -5°C as required.
Modifications to this value do not directly change delivery tempe-
rature but affect the calculation made to automatically determine
its value by modifying the reference temperature of the system (0
= 20°C).
CLIMATE CURVE CORRECTION
90
80
70
60
50
40
30
+ 5 C
0 C
20
10
30 25 20 15
EXTERNAL TEMPERATURE (°C)
If a programmable timer is connected to the boiler, set
parameter 51 = 1 (this parameter can only be modified from
the remote control unit)
When the contact is closed, the heat request is made by the delivery
probe on the basis of the external temperature in order to maintain
the rated ambient temperature at the DAY level (20 °C). When the
contact opens, it does not stop the heat request but reduces (parallel
shift) the temperature curve to the NIGHT level (16 °C).
This activates the night mode.
Though delivery temperature is automatically calculated by the
boiler, the user may manually override it.
By modifying HEATING on the user interface (C, fig. 34), the
HEATING SET POINT will no longer be available but just a value
that can be set from +5 to -5°C as required.
Modifications to this value do not directly change delivery tempe-
rature but affect the calculation made to automatically determine
its value by modifying the reference temperature of the system (0
= 20°C for DAY level; 16°C for NIGHT level).
PARALLEL NIGHT TIME REDUCTION
90
80
climate
70 curve DAY
Curva climatica GIORNO
60
50
40
30
20
10
20 15 10
EXTERNAL TEMPERATURE (°C)
17
- 5 C
10 5 0 -5 -10
Riduzione notturna PARALLELA
climate
curve NIGHT
Curva climatica NOTTE
5 0 -5 -10 -15
Temperatura Esterna
-15 -20
-20