Connecting the modulating regulator
OT OpenTherm thermostat
The boiler is fitted with an OpenTherm connection as standard. As a
result, modulating OpenTherm thermostats (room-temperature, weather-
compensated and cascade thermostats) can be connected without further
modifications. The boiler is also suitable for OpenTherm Smart Power.
1. In the case of a room thermostat: install the thermostat in a reference
room.
2. Connect the two-wire cable to the On/Off OT terminals of the
connector. It does not matter which wire is connected to which cable
clamp.
Analogue input
This input has two modes: control based on temperature or based on heat
output. If this input is used, the OT communication from the boiler is
ignored.
1. Connect the input signal to terminals 0–10 of the connector.
Change the mode of the analogue input using the parameter EP014.
0-10 Volt analogue temperature regulation (°C)
The appliance can be controlled by a 0-10 Volt input signal. When
configured to temperature-based, the 0–10 V signal controls the boiler
supply temperature.
1 Boiler on
2 Parameter CP010
3 Maximum flow temperature
4 Calculated value
Tab.18 Temperature regulation
Input signal (V)
Temperature °C
Description
0–1.5
0–15
Boiler off
1.5–1.8
15–18
Hysteresis
1.8–10
18–100
Desired temperature
0-10 Volt analogue output-based control
The appliance can be controlled by a 0-10 Volt input signal. When
configured to output-based, the 0-10 Volt signal controls the boiler output.
Important
The start voltage depends on the relation between the fan speed
range and the actual set maximum fan speed. An estimate of the
start voltage can be calculated.
Fig.29
Modulating thermostat
AD-3001310-01
OT
On/off
OT
Fig.30
Analogue input
AD-3001304-02
+
-
0-10
Fig.31
Temperature regulation graph
AD-0001156-03
0
10
0 - 10 V
0
100
2
3
4
1
5 Installation
28
7701838 - v.09 - 10122021
