Viessmann: Multi-zone heat pump control via wired connection
What do you need?
Niko requirements
Your Niko Home Control installation meets the following requirements:
It has a connected controller II.
It is configured with the most recent programming software.
You need to install the following additional products:
One heating or cooling module for Niko Home Control (550-00150) per four zones
A switching module for Niko Home Control (550-00103 or 550-00106) with at least one free output
A digital potential-free sensor module for Niko Home Control (550-00210) with at least one free input
If the output contact on your heat pump system is not potential-free, you need an additional potential-free contact module (e.g. Finder 22.32.0.230.1xx0)
One thermostat per zone:
A Digital black, 24 V (550-18000)
Viessmann requirements
Your system meets the following requirements:
It is a heat pump system that supports:
heating only
heating/cooling
It has a buffer tank, connected in parallel, as well as an additional bypass circuit.
The heat pump has a contact that indicates whether the heating/cooling mode is active.
In heat pumps with One Base control, the buffer tank and bypass circuit are fully integrated into the heat pump.
Wiring diagram for multi-zone heating/cooling
The wiring diagram below shows how you can use Niko Home Control with your heat pump system and enable Niko routines for multi-zone heating/cooling.
The heating/cooling mode switchover is initiated by the partner system; pump control is not needed. 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.
Vitocal with Vitotronic W01C control
Contact on the Viessmann heat pump: contact 211.5 (sensor input)
Connect the contact on the heat pump to an input of the Niko Home Control digital potential-free sensor module:
Vitocal with One Base control
Contacts on the Viessmann heat pump: contact 171.8 (230V L-wire) and contact 171.6 (230V N-wire)
Connect the contacts on the heat pump via an external 230V to potential free relay to an input of the Niko Home Control digital potential-free sensor module:
Programming of the Viessmann integration
Configure the heating or cooling module, switching module, potential-free sensor module and thermostats via the Niko Home Control programming software.
You can use the following programming example as inspiration or as a starting point: https://guide.niko.eu/en/penhc2/lv/heating-and-cooling-thermostat-controls-heat-pump.
Settings for multi-zone heating/cooling
Use the following settings to ensure correct operation:
Limit the control mechanisms of the heat pump:
In case of a heat pump with Vitotronic W01C control, the heat pump should only take into account the weather-dependent control, clock program (or manual) and flow temperature T0.
In case of a heat pump with One Base control, the heat pump should only take into account manual control.
The Niko Home Control thermostats must be forced/blocked in the relevant mode via the Niko Home Control digital input module that is connected to the heating/cooling output of the heat pump.
Input closed = cooling
Input open = heating