---
title: Connection diagram / port overview
description: "![](https://faqdoc.info/wp-content/uploads/2026/01/Matrix_55__Anschlussplan-451x1024.png) **A**Electric heating **B** Water-based underfloor heating and cooling **Clamp 6 / 7** Floor temperature sensor **Clamp 7 / 8** External room temperature sensor"
url: "https://faqdoc.info/en/systemauswahl/alpha-direct-en/alpha-direct-thermostat-55-matrix/connection-diagram-port-overview/"
updated: "2026-09-30"
category: Alpha direct thermostat 55 Matrix
---

# Connection diagram / port overview

![](https://faqdoc.info/wp-content/uploads/2026/01/Matrix_55__Anschlussplan-451x1024.png)

**A**Electric heating

**B** Water-based underfloor heating and cooling

**Clamp 6 / 7** Floor temperature sensor

**Clamp 7 / 8** External room temperature sensor