Connecting modulating thermostat
OT OpenTherm thermostat
The boiler is fitted with an OpenTherm connection as standard. As a re
sult, 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 refer
ence room.
2. Connect the two-wire cable of the thermostat to the On/Off OT termi
nals of the connector. It does not matter which wire is connected to
which cable clamp.
Note
If the tap water temperature can be set on the OpenTherm ther
mostat, the boiler will supply this temperature, with the value set in
the boiler as a maximum.
Connecting the on/off thermostat
Tk On/off ambient thermostat
The boiler is suitable for connection to a two-wire on/off ambient thermo
stat.
1. Fit the thermostat in a reference room (generally the living room).
2. Connect the two-wire cable of the thermostat to the On/off OT termi
nals of the connector. It does not matter which wire is connected to
which cable clamp.
3. Connect the power-stealing thermostat to the On/off OT terminals of
the connector.
Note
If an ambient thermostat with an anticipation element is used, this
must be completed via parameter
.
Fig.20 Connecting modulating thermostat
AD-0000046-01
On/off
OT
BL
RL
Tout
Tdhw
OT
On
/off
Tout
Tdhw
BL
RL
OT
Fig.21 Connecting the on/off thermostat
AD-0000047-01
Tk
OT
On
/off
Tout
Tdhw
BL
RL
On/off
OT
BL
RL
Tout
Tdhw
6 Installation
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