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10.1 External safety contact (white)
This connection comes with a loop of wire. This loop enables the boiler to work. Removing the loop will stop
the boiler from ring up.
The connection can be used to connect a condensate pump safety overow switch, where this will stop the
boiler from ring if the condensate pump cannot get rid of the condensate water and the safety overow
switch is triggered
10.2 DHW sensor connection (yellow)
N/A not applicable.
10.3 OpenTherm BUS & ON / OFF connection (blue)
This PCB will detect if an OpenTherm or an On / O device is connected to the blue plug on the terminal
block.
An OpenTherm compatible device as well as a volt free on / o thermostat or programmable room thermostat
can be used to switch on or o the heat demand to the boiler.
10.4 ATAG Zone connection (red)
The ATAG One zone smart room thermostat is the primary candidate for use of the ATAG zone eBus
connection. The smart room thermostat can also be substituted by another ATAG zone compatible room
controller, this eBus enables the boiler to modulate set point temperatures for optimal eciency.
On top of the thermostats, the connection is used for other ATAG zone compatible devices such as zone
management accessories.
10.5 Solar inlet sensor connection (grey)
N/A not applicable.
10.6 ATAG Outside sensor (rose)
When a weather compensation sensor (supplied with the boiler) is used, the two wires from the outside
sensor get wired into the plug supplied on the terminal block in the rose connector position.
10.7 230V Out (230V live output, white)
Not used.
10.8 230V In (230V live input, white)
This is the 230V mains power input to the boiler connection.
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