---
title: CAR / CAF / CAE (calibration)
description: "![](https://faqdoc.info/wp-content/uploads/2026/01/Matrix_55__icon_Elektro-Wasser.png) - adjustment range: -10 K … +10 K - Default: 0 K --- **CAR**: Setpoint balancing of internal temperature sensor Prerequisite for use: - Internal sensor A or AF set in sensor mode (→ [SMO](https://faqdoc.info/en/systemauswahl/alpha-direct-en/55-matrix/smo/)) --- **CAF**: Setpoint balancing…"
url: "https://faqdoc.info/en/systemauswahl/alpha-direct-en/alpha-direct-thermostat-55-matrix/car-caf/"
updated: "2026-09-30"
category: Alpha direct thermostat 55 Matrix
---

# CAR / CAF / CAE (calibration)

![](https://faqdoc.info/wp-content/uploads/2026/01/Matrix_55__icon_Elektro-Wasser.png)

- adjustment range: -10 K … +10 K
- Default: 0 K

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**CAR**: Setpoint balancing of internal temperature sensor

Prerequisite for use:

- Internal sensor A or AF set in sensor mode (→ [SMO](https://faqdoc.info/en/systemauswahl/alpha-direct-en/55-matrix/smo/))

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**CAF**: Setpoint balancing for floor sensor

Prerequisite for use:

- Floor sensor F, AF or A2F set in sensor mode (→ [SMO](https://faqdoc.info/en/systemauswahl/alpha-direct-en/55-matrix/smo/))

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**CAE**: Setpoint balancing for external sensors

Prerequisite for use:

- Sensor A2 or A2F set to sensor mode (→ [SMO](https://faqdoc.info/en/systemauswahl/alpha-direct-en/55-matrix/smo/))