ABC wiring

Installation intructions (wiring)

Connecting the Coiaca ABC board to your boiler is straightforward. Below, we illustrate the process using a Junker Euromaxx boiler, which can be adapted for similar models. Remember to always consult your boiler’s user manual to compare and connect accordngly.

1 – Switch off the boiler.

2 – Disconnect the boiler from the main power supply.

3 – Remove the old thermostat, if any.

4 – Using seven wires, establish the following connections:

  • The NC terminal on the board to the LR terminal on the boiler.
  • The C terminal on the board to the Ls terminal on the boiler.
  • The Vcc terminal on the board to the 1 terminal on the boiler.
  • The Out terminal on the board to the 2 terminal on the boiler.
  • The Gnd terminal on the board to the 4 terminal on the boiler.
  • One of the P3 AC input connector on the board to the L terminal on the boiler.
  • The other of the P3 AC input connector on the board to the N terminal on the boiler.
  • For this Junkers Euromaxx model, when connecting an ambient thermostat, terminals 8 and 9 (highlighted by the blue circle in the image) should be jumpered. Conversely, when using a simple on-off thermostat, these terminals should remain unjumpered.
Wiring for a Junkers Euromaxx boiler
(click to enlarge)

5 – Reconnect the boiler to the mains and power it on.

Now, the board will boot up, allowing you configure it.

What is the best location to place the device?

If you are integrating the device into your home automation system and already have temperature sensors installed or plan to install them, it is best to place the Coiaca ABC close to the boiler you intend to control. This way, you will need short cables, making the installation easier. Conversely, if you do not have temperature sensors in your home automation system and plan to connect one to the Coiaca ABC or use the Temperature and Humidity Sensor for ABCt accessory, you will need to place the device whitin the area to be heated. This will require the seven cables connecting the boiler and the device to be long enough, and you may need to conceal them for a clean and secure installation.

Related:
– Unlock Maximum Efficiency: Control Your Old Heating System with Coiaca Wifi ABC Board! (Blog)
– Maximizing Comfort, Minimizing Costs: The Essentials of Efficient Boiler Heating (Blog)
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