Tk On/off thermostat
1. Fit the thermostat in a reference room (generally the living room).
2. Connect the two-wire cable of the thermostat (Tk) to the R-Bus
terminals of the connector. It does not matter which wire is connected
to which cable clamp.
Frost protection combined with on/off thermostat
When an on/off thermostat is used, the pipes and radiators in a frost-
sensitive room can be protected by a frost thermostat. The radiator valve
in the frost-sensitive room must be open.
Tk On/off thermostat
Tv Frost thermostat
1. Place a frost thermostat (Tv) in a frost-sensitive room (e.g. a garage).
2. Connect the frost thermostat (Tv) parallel to the on/off thermostat (Tk)
on the R-Bus terminals for the connector.
Warning
If a De Dietrich Smart TC° or OpenTherm thermostat is used, a
frost thermostat cannot be connected in parallel to the R-Bus
terminals. In that case, implement frost protection of the central
heating system in combination with an outside sensor.
Frost protection combined with outside sensor
The central heating system can also be protected against frost in
combination with an outside sensor. The radiator valve in the frost-
sensitive room must be open.
Important
For boilers with an SCB-10 PCB, the outdoor sensor is connected
to the SCB-10 PCB.
The frost protection works as follows with an outside sensor:
If the outside temperature in lower than -10°C: heat demand from the
boiler and the pump starts working.
If the outside temperature is higher than -10°C: no heat demand from
the boiler.
Important
The outside temperature before the start of frost protection can be
changed with parameter AP080.
Connecting an outside sensor
An outside sensor can be connected to the Tout connector. In the case of
an on/off thermostat, the boiler will control the temperature with the set
point from the internal heating curve.
See
Adjusting the heating curve, page 81
Important
For boilers with an SCB-10 PCB, the outdoor sensor is connected
to the SCB-10 PCB.
Important
An OpenTherm controller can also use this outside sensor. In that
case, the desired internal heating curve must be set on the
controller.
Fig.35 Connecting the on/off thermostat
Fig.36 Connection of frost thermostat
6 Installation
7686707 - v.01 - 06092018 AMC 39
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