24
START CONDENS 25 IS
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 compensation 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 selection of the KT should be carried out by acting on trimmer
P3 on the board (see Multi-row wiring diagram).
To access P3:
• Remove the housing
• Undo the fixing screw of the instrument panel
• Turn the control panel towards you
• Undo the fixing screws of the terminal board cover
• Unhook the board cover
9
Live electrical parts (230 Vac).
The settable KT values are as follows:
• standard system: 1.0-1.5-2.0-2.5-3.0
• floor installation 0.2-0.4-0.6-0.8
• and appear on the display for a duration of about three seconds
after the rotation of trimmer P3.
Type of heat request
If the boiler is connected to a ambient thermostat (JUMPER 6
not included)
The heat request is made by the closure of the room thermostat
contact, while the opening of the contact produces a switch-off.
The delivery temperature is automatically calculated by the boiler,
although the user may interact with the boiler. Using the interface to
modify the HEATING, you will not have the HEATING SET-POINT
value available, but a value that you can set as preferred between
15 and 25°C. The modification of this value will not directly modify
the delivery temperature, but will automatically affect the calculation
that determines the value of that temperature, altering the reference
temperature in the system (0 = 20°C).
If the boiler is connected to a timer (JUMPER JP6 inserted)
With the contact closed, the heat request is made by the delivery
probe, on the basis of the external 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). The night-time mode is ac-
tive in this way. The delivery temperature is automatically calculated
by the boiler, although the user may interact with the boiler.
Using the interface to modify the HEATING, you will not have the
HEATING SET-POINT value available, but a value that you can set
as preferred between 15 and 25°C. The modification of this value
will not directly modify the delivery temperature, but will automatical-
ly affect the calculation that determines the value of that tempera-
ture, altering the reference temperature in the system (0 = 20°C for
DAY level; 16°C for NIGHT level).
Different curves can be selected depending on the experience of
the installer.
Thermoregulation curves
The display shows the value of the curve multiplied by 10
(e.g.. 3.0 = 30)
Temperatura esterna (˚C)
Temperatura di mandata
(˚
C
)
20
30
40
50
60
70
80
90
100
-20
0,2
0,4
0,6
0,8
1,0
1,5
2,0
2,5
3,0
T80
T45
-15
-10
-5
0
5
10
15
20
Outside temperature (°C)
Delivery temperature (°C)
T80 - std heating system maximum setpoint temperature
(jumper pos. 1 not inserted).
T45 - floor heating system maximum setpoint temperature
(jumper pos. 1 inserted).
Climatic curve correction
20 °C
25 ° C
15 °C
10
20
30
40
50
60
70
80
90
-20
-15
-10
-5
0
5
10
15
20
25
30
Outside temperature (°C)
Delivery temperature (°C)
Parallel night-time reduction
10
20
30
40
50
60
70
80
90
-20
-15
-10
-5
0
5
10
15
20
Temperatura Esterna
T
e
mperatura di
Curva climatica GIORNO
Curva climatica NOTTE
16 °C
20 °C
Outside temperature (°C)
Night-time temperature
curve
Daytime temperature
curve
Delivery temperature (°C)
3 - Adjustments
START CONDENS IS
boilers are intended for use with methane gas
(G20) and are already factory set as specified on the rating plate.
If adjustments have to be redone, for example after extraordinary
maintenance, after the gas valve replacement or after conversion
from methane gas to LPG and vice versa, the following procedures
must be followed.
9
The adjustment of the maximum and minimum output, and slow
ignition, must be made in the sequence indicated, and by quali-
fied personnel only.
• Disconnect the power supply to the boiler
• Turn the heating water temperature selector to its maximum
• Unscrew the fixing screws of the hatch on the terminal board cover
Содержание Start Condens 25 IS
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