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HMI Controller CA2

The Grayson CA2 is a 12/24 V DC HMI driver cabin controller providing intuitive control of heating, defrost and air conditioning functions.

Featuring a clear digital display, CAN communication and configurable operating modes, the CA2 enables precise, user-friendly climate management across a wide range of vehicle platforms. Compact, robust and easy to install, it integrates seamlessly into modern driver cabin environments.

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Overview

The CA2 HMI Controller from Grayson is a human–machine interface designed to give drivers simple, reliable control over cabin climate systems. Supporting heating-only or combined heating and air conditioning configurations, it allows intuitive adjustment of temperature, airflow, vent selection and defrost functions via clearly defined controls and a digital LCD display.

CAN communication enables seamless integration with vehicle HVAC systems, while configurable parameters allow OEMs to define operating boundaries. Designed for demanding vehicle environments, the CA2 operates reliably across extreme temperatures and features front-facing IP54 protection.

Its compact form factor, glove-friendly controls and clean visual design ensure straightforward installation and ease of use for drivers in on-highway and off-highway applications.

Features

The technical design is configured to maintain consistent operation and support long-term performance reliability.

  • Integrated Heating and AC Control: Enables centralised, intuitive management of driver cabin climate systems.
  • Clear Digital LCD Display: Displays cabin temperature, operating mode, fan speed and vent selection at a glance.
  • Temperature Control Dial: Allows fast, precise adjustment of desired cabin temperature.
  • Dedicated Airflow Controls: Enables accurate fan speed and air direction selection for comfort and visibility.
  • Defrost and Fast Defrost Modes: Improve windscreen clarity in cold or high-humidity conditions.
  • CAN Communication: Supports seamless integration with vehicle HVAC and thermal management systems.
  • Mode-Dependent Colour Illumination: Provides immediate visual feedback on system status and operating mode.
  • Reliable Design: Dependable operation across extreme ambient temperatures and demanding duty cycles.
  • Glove-Friendly Controls: Designed for ease of use in public transportation, industrial and commercial vehicle environments.
Technical

Each technical element supports stable operation, helping ensure dependable performance in service.

  • Functions: Heating and air conditioning climate control
  • Nominal voltage: 12 / 24 V DC
  • Maximum voltage: 32 V DC (Duration: 5 minutes)
  • Dimensions (H × W × D): 60 × 188 × 31 mm
  • Operating temperature range: –40°C to +85°C
  • Protection rating: IP54 (front, IEC 60529)
  • Communication: CAN
  • Electrical protection: Output short-circuit and reverse polarity protection
Variations

EP-1005-090: Heating only driver control panel

EP-1005-089: Heating and air conditioning driver control panel

MP-1036-043R: Heating and air conditioning driver control panel

User Interface

Digital Display

Clear visibility of cabin temperature, mode, airflow and system status.
Operating Range

–40°C to +85°C

Designed for reliable performance in extreme climates.
Voltage Supply

12 / 24V DC

Supports a wide range of heavy vehicle applications.
Ingress Protection

IP54 Front Protection

IP54 front protection resists dust and moisture in demanding cab environments.
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Compatible Applications

Product Benefits​

Discover why the world’s leading on-highway and off-highway OEMs choose the CA2 HMI Controller to deliver intuitive, easy-to-use climate control.

Intuitive Driver Operation

Clear controls and visual feedback reduce driver distraction and improve usability.

Flexible HVAC Integration

Compatible with heating-only or heating and air conditioning cabin systems.

OEM-Configurable Behaviour

Operating limits and functions can be defined to suit specific vehicle requirements.

Reliable in Harsh Conditions

Designed to operate consistently in extreme temperatures and heavy-duty applications.

Compact, Easy Installation

Slim profile integrates cleanly into dashboards and driver cabin interiors.

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With over 40 years of experience, Grayson Thermal Systems provides advanced thermal technologies to vehicle markets around the world. Our solutions are built for reliability, efficiency, and durability.