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1. Connect the plug from the outdoor sensor to the Tout connector.
The frost protection works as follows with an outdoor sensor:
If the outdoor temperature is lower than the threshold for frost
protection: heat demand from the boiler and the pump starts working.
If the outdoor temperature is higher than the threshold for frost
protection: no heat demand from the boiler.
Important
The outdoor temperature threshold for frost protection can be
changed with parameter AP080.
Connecting the calorifier sensor/thermostat
A calorifier sensor or thermostat can be connected to the Tdhw terminals
of the connector. Only NTC 10 kΩ/25°C sensors can be used.
1. Connect the two-wire cable to the Tdhw terminals of the connector.
5.5.4 Connection options for the expansion PCB - IF-01
The expansion board IF-01 is pre-installed in the instrument box as
standard.
Caution
Do not connect a frost thermostat or room thermostat to the boiler
if using the 0–10 V control PCB.
Connecting the status relay (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, 1 A) on terminals
Nc and C of the connector.
Connection (OTm)
The interface uses OpenTherm to communicate with the boiler control
unit. To make this possible, the OTm connection must be connected to the
OpenTherm input of the boiler control unit.OTm
Analogue input (0-10 V)
A choice can be made with this control between control based on
temperature or heat output. The two controls are described briefly below.
1. Connect the input signal to terminals 0–10 of the connector.
Fig.28 Connecting an outdoor sensor
AD-3000973-02
Tout
Fig.29 Connecting the calorifier sensor/
thermostat
AD-3000971-02
Tdhw
Fig.30 IF-01 PCB
AD-0000054-01
Status 0-10 0-10
Nc NoC
Nc No OTm 0 + 0 +C
OTm 0 + 0 +
X5
X4
X1
IF-01
%
1
2
5 Installation
28 7684359 - v.11 - 13122021
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