---
title: WMO (manual heating / cooling)
description: "![](https://faqdoc.info/wp-content/uploads/2026/01/Matrix_55__Icon_wasser.png) Manual selection between heating and cooling. Ideal for standalone solutions without an external CO signal. Because the controller does not have a CO output, the manual switching function cannot be extended to other controllers, base modules, or systems. Prerequisite…"
url: "https://faqdoc.info/en/systemauswahl/alpha-direct-en/alpha-direct-thermostat-55-matrix/tss-wmo/"
updated: "2026-09-30"
category: Alpha direct thermostat 55 Matrix
---

# WMO (manual heating / cooling)

![](https://faqdoc.info/wp-content/uploads/2026/01/Matrix_55__Icon_wasser.png)

Manual selection between heating and cooling. Ideal for standalone solutions without an external CO signal.
Because the controller does not have a CO output, the manual switching function cannot be extended to other controllers, base modules, or systems.

Prerequisite for use:

- Selection of the heating type WEH: WH

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HEA: Heating (default)

COO: Cooling