Viessmann - Wired connection - Multi-zone heating/cooling

What do you need?

In short

Extra information

General

Specific electrical wiring is required.

Your Niko Home Control installation meets the following requirements:

It has a connected controller II.
It is configured with the most recent programming software (version 2.17 or higher).

You need the following if you want to use the Niko Home control multi-zone thermostat control:

a digital potential-free sensor module for Niko Home Control (550-00210) with at least one free input
an extra 230V/potential-free contact module (e.g. Finder 22.32.0.230.1xx0) for Viessmann one-base installations
a heating or cooling module for Niko Home Control (550-00150) (per four zones, an extra module is needed)
one thermostat per zone:
- a Digital black, 24 V (550-1800X)
- a push button with LED(s) and comfort sensors

Your partner system meets the following requirements:

It is a Viessmann heat pump system that supports:
- heating only
- heating/cooling
It has a buffer tank*

A contact on the heat pump indicates whether the heating/cooling mode is active.

*In One Base heat pumps, the buffer tank and bypass circuit are fully integrated into the heat pump.

The table below shows how you can use Niko Home Control with your Viessmann system and enable Niko routines.

Niko Home Control set-up

Wiring diagram

Enable a Niko routine with a partner

Multi-zone heating/cooling –
The heating/cooling mode switchover is initiated by the partner system
(pump control not needed)

Vitocal with W01C:

Vitocal with One Base:

A contact on the heat pump provides the signal to the Niko Home Control installation to switch from heating to cooling mode and vice versa.

When using Viessmann Vitocal with W01C control:

Connect connector contact 211.5 (sensor input) to an input of the NHC Digital potential-free sensor module

When using Viessmann Vitocal with One Base:

Connect connector contact 171.8 (230V L-wire) and connector contact 171.6 (230V N-wire) via an external 230V to potential free relais to an input of the NHC Digital potential-free sensor module

To view HVAC programming examples, please see Niko Home Control programming examples.

Multi-zone heating/cooling with zone valves can only be performed if the following conditions are met.

In case of a heat pump with WC01 control:

The heat pump has a buffer tank connected in parallel, as well as an additional bypass circuit.
The Niko Home Control thermostats must be forced/blocked in the relevant mode via the Niko Home Control digital input module connected to the heating/cooling output of the heat pump.
- Input closed = cooling
- Input open = heating

In case of a heat pump with One Base control:

The heat pump only takes into account the weather-dependent control, clock program (or manual) and flow temperature T0.
The heat pump decides between heating or cooling, depending on the weather. The Niko Home Control thermostats must be forced/blocked in the relevant mode via the Niko Home Control digital input module connected to the heating/cooling output of the heat pump.
- Input closed = cooling
- Input open = heating