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2.5 CONNECTING THE ZONES CONTROL UNIT TO A BOILER VIA DIM BUS
On boiler models set up for digital communication with the zone control unit, the BUS dialogue can be activated with a wide exchange
of interactions between boiler and Zones control unit, the main ones being:
e Zones control unit will receive the following from the boiler:
- Enabling zone mode (Summer, Winter mode, etc.)
- Temperatures regulated on the boiler display for Low Temperature zones (where possible);
- External temperature probe connected to boiler;
- Zone activation request from external devices connected to the boiler (CAR, Wireless probes, etc.)
e boiler will receive the following from the Zones control unit:
- Central heating request from zones;
- Boiler ow temperature correlated to the zones request.
- Error codes of the faults present on the zone control unit.
If the boiler requires it, the BUS connection can be made to the terminals indicated as DIM BUS or 44-41, or 40-41 (see boiler instruc-
tion booklet).
Eliminate jumper X40 on the boiler terminal board (see boiler instruction booklet).
Key:
1 - Zones control unit
2 - DIM BUS connection to boiler
ONLY FOR BOILERS SET-UP FOR DIGITAL COMMUNICATION WITH ZONES CONTROL UNIT
STD.009285/001
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