Immergas V2 Instructions And Warnings page 40

2.7 CONNECTING THE ZONES CONTROL UNIT TO GENERAL BOILERS
With this type of connection, when you want to disconnect the kit from the power supply to access its maintenance, you must also
disconnect the boiler from the power supply
CONNECTING TO GENERAL BOILERS
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If the Zones control unit is connected to the boiler without the zone signal state or the BUS dialogue, the zone pumps are controlled
only by the respective room thermostats. In this case, the pumps cannot be controlled from the boiler, activating them for example for
post-circulations or deactivating them by selecting the "summer" function on the boiler.
The Zones control unit must be connected to its own external probe (if necessary).
The mixed zone flow temperatures must be adjusted on the Zones control unit trimmers.
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Key:
1 - Zones control unit
2 - External probe (optional)
3 - Boiler ignition request: the potential free contact of the boiler ignition
control relay is available at terminals 15 and 16 of the zones control
unit (230 Vac, 0.5 A max). The contact is closed with active request.
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