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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 firing up.
The connection can be used to connect a condensate pump safety overflow switch, where this will stop the boiler from firing if the condensate
pump cannot get rid of the condensate water and the safety overflow switch is triggered.
DHW sensor connection (yellow)
N/A not applicable.
OpenTherm BUS & ON / OFF connection (blue)
This PCB will detect if an OpenTherm or an On / Off device is connected to the blue plug on the terminal block.
An OpenTherm compatible device as well as a volt free on / off thermostat or programmable room thermostat can be used to switch on or off the
heat demand to the boiler.
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
efficiency.
On top of the thermostats, the connection is used for other ATAG zone compatible devices such as zone management accessories.
Solar inlet sensor connection (grey)
N/A not applicable.
ATAG Outside sensor (rose)
When a weather compensation sensor (supplied with the iC Range of combination boilers) is used, the two wires from the outside sensor get
wired into the plug supplied on the terminal block in the rose connector position.
230V Out (230V live output, white)
Not used.
230V In (230V live input, white)
This is the 230V mains power input to the boiler connection.
Terminal block LV iC-Range
ATAG Outdoor sensor 1kOhm*
n.a. = not applicable
ATAG Zone connection
OpenTherm or ON/OFF thermostat
n.a. = not applicable
DHW sensor T3
External safety contact
terminal block
PE
N
PE
L
N
L’
230V o
ut
230V Co
ntro
l
PE
N
L
230V in
N
L
230V o
ut
DO NOT CONNECT 230 VO
LT
* Mounting on north – north/east facade of the house. Prevent outside influences such as snow, ventilation air or chimney heat.
230V live output
to pump
E
N
L
E
L
N
SwL
230V out
230V Control
E
N
L
230V in
N
L
230V out
230V control terminal block iC-Range
N:
Neutral
L:
Live
E:
Earth
N:
Neutral
L:
Live
E:
Earth
L:
Live
N:
Neutral
SwL:
Switched live
230V live input only!
E:
Earth pump
N:
Neutral pump
L:
Live pump
230V live output
230V out
230V in LNE
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