Frost protection combined with outdoor sensor
The central heating system can also be protected against frost in
combination with an outdoor sensor. The radiator valve in the frost-
sensitive room must be open.
1. Connect the outdoor sensor to the terminals Tout of the connector.
The frost protection works as follows with an outdoor sensor:
At outside temperatures below -10 °C: the circulation pump switches on.
At outside temperatures above -10 °C: the circulation pump continues to
run and then switches off.
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.
For more information, see
Parameters - FSB-WHB-HE-150-300, page 50
Changing the parameters, page 49
Analogue temperature regulation (°C)
1 Boiler on
2 Parameter CP010
3 Maximum flow temperature
4 Calculated value
The 0–10 V signal controls the boiler supply temperature. This control
modulates on the basis of flow temperature. The output varies between
the minimum and maximum value on the basis of the flow temperature set
point calculated by the controller.
Tab.23 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
Analogue output-based control
The 0 - 10 V signal controls the boiler output. This control modulates on
the basis of the heat output. The minimum output is linked to the boiler's
modulation depth. The output varies between the minimum and maximum
value on the basis of the value defined by the controller.
Fig.30
Outdoor sensor
AD-3000973-02
Tout
Fig.31
Modulating thermostat
AD-3001310-01
OT
On/off
OT
Fig.32
Analogue input
AD-3001304-01
+
-
0-10
Fig.33
Temperature regulation
AD-0001156-02
0
1
2
3
4
5
6
7
8
9
10
0 - 10 V
10
20
30
40
50
60
70
80
90
100
2
3
4
1
6 Installation
38
7625116 - v.06 - 17102018
