---
title: VPA / VPD (Valve protection)
description: "![](https://faqdoc.info/wp-content/uploads/2026/01/Matrix_55__Icon_wasser.png) **VPA** Duration control Adjustable in 1-minute-increments between 1 and 10 minutes (default: 5 min) **VPD** Cycle interval of the valve protection Adjustable in 1-day-increments between 1 day and 28 days (default: 14 Tage)"
url: "https://faqdoc.info/en/systemauswahl/alpha-direct-en/alpha-direct-thermostat-55-matrix/val-vpa-vpd/"
updated: "2026-09-30"
category: Alpha direct thermostat 55 Matrix
---

# VPA / VPD (Valve protection)

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

**VPA**
Duration control
Adjustable in 1-minute-increments between 1 and 10 minutes (default: 5 min)

**VPD**
Cycle interval of the valve protection
Adjustable in 1-day-increments between 1 day and 28 days (default: 14 Tage)