4.10 Optional electrical connections
4.10.1.
Connection options for the 0-10 V control
PCB (IF-01)
The IF-01 control PCB can be built into the instrument box or the
housing for the control PCBs. Refer to the instructions supplied with
the product.
CAUTION
Do not connect a frost thermostat or room thermostat to
the boiler if using the 0-10 V control PCB.
n
Connection status (Nc)
If the boiler locks out, a relay is de-energised and the alarm can be
transmitted via a potential-free contact (maximum 230 V, 1A) on
terminals
Nc
and
C
of the connector.
n
Connection (OTm)
The interface communicates with the boiler control via
OpenTherm
.
The
OTm
connection must be connected to the
OpenTherm
input
OT
of the boiler control.
n
Analogue input (0-10 V)
This control can be based on temperature or heat output. The two
controls are described briefly below. For analogue control, the 0-10
V signal must be connected to the interface.
n
Analogue temperature-based control (
*
)
The 0-10 V signal controls the boiler flow temperature between 0°C
and 100°C. This control modulates on the basis of flow temperature,
whereby the heat output varies between the minimum and maximum
values on the basis of the flow temperature set point calculated by
the controller.
A jumper (
2
) on the interface is used to select either temperature
control (
*
) or heat output control (
%
).
Jumper 2 Input signal (V) Temperature ºC Description
*
0 - 1,5
0 - 15
Boiler off
1,5 - 1,8
15 - 18
Hysteresis
1,8 - 10
18 - 100
Temperature required
T000784-A
Status
0-10
0-10
Nc
No
C
Nc
No
OTm
0 +
0 +
C
OTm
0 +
0 +
X5
X4
X1
IF-01
%
1
2
T000785-A
1
2
%
2
2
4. Installation
Calenta 25s - 28c - 35s - 40c
46
040412 - 7600585-01
Содержание Calenta 25s
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