13 Domestic hot water sensor
14 Flow sensor - circuit C
15 Flow sensor - circuit B
16 Flow sensor - circuit A
17 Impressed current anode
18 Modbus connectors
19 Coding wheel, selects the generator number in the
cascade in Mod-Bus
20 S-BUS connector
21 End connector for L-BUS connection
22 L-BUS connector
23 S-BUS connector
Connecting a domestic hot water (DHW) pump
Connecting a domestic hot water (DHW) pump. The maximum power
consumption is 300 VA.
Connect the pump as follows:
Earth
N Neutral
L Phase
Connecting a mixing valve
Connecting a mixing valve (230 VAC) per zone (group).
Connect the mixing-way valve as follows:
Earth
N Neutral
Open
Close
Connecting the pump with a protection thermostat
Connecting a pump with a protection thermostat, e.g. for underfloor
heating. The maximum pump power consumption is 300 VA.
Connect the pump and the protection thermostat as follows:
Earth
N Neutral
L Phase
TS protection thermostat (remove bridge)
Connecting an outdoor temperature sensor
An outdoor temperature sensor can be connected to the Tout connector.
Always connect the sensor to the PCB that controls the zones. For
example: when the zones are controlled by an SCB-10, connect the
sensor to that PCB.
1. Connect the two-wire cable to the Tout connector.
Set parameter AP056 to the installed outdoor temperature sensor type.
When an on/off thermostat is also connected, the boiler will control the
temperature with the set point from the internal heating curve. OpenTherm
controllers can also use the outdoor temperature sensor. In that case, the
desired heating curve must be set on the controller.
Connecting a telephone connector
The telephone connector can be used to connect a remote control, a 0–10
V analogue input or as a status output.
Fig.50
DHW pump connector
AD-4000123-01
N L
Fig.51
Mixing valve connectors
AD-4000002-01
A
N
B
N
Fig.52
Pump with protection thermostat
connector
AD-4000001-02
N L
TS
N L
TS
Fig.53
Tout connector
AD-4000006-02
Tout
5 Installation
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C 340 / C 640
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