Dometic Cruisair SMXII Controller
The Dometic Cruisair SMXII controller is a digital control system widely used in marine air conditioning systems, especially on boats and yachts, known for its ease of use and durable design.
Upgrade your vessel’s climate control with the Cruisair SMX II — an advanced, microprocessor-based control system designed specifically for marine direct expansion (DX) or tempered water (TW) air conditioning units. Built for reliability, ease of use, and accurate comfort in harsh marine environments.
Key Features
- Precision Temperature Control: Set your desired temperature and let the SMX II maintain it with minimal fluctuation. The logic board includes a responsive control over fan speed to match room conditions.
- Multiple Display Options: Works with three display/keypad styles — SMXIIAB (larger, traditional rectangular), SMXir (smaller with hinged cover), and SMXht (modern "high-technology" style). All communicate with the same power/logic board.
- User-Friendly Interface: Soft-touch membrane keys (or overlayed overlay where applicable), clearly labeled buttons, LED indicators to show mode (Cooling / Heating / Auto) and status. Large digital display for temperature, set-point, and fault or warning codes.
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Programmable Features: Many settings can be customised, including: • Fahrenheit / Celsius display
- Auxiliary heat mode (for TW systems)
- Automatic or manual fan speed, low/high fan speeds adjustment
- Dehumidification program (runs when the system is unoccupied to manage cabin humidity)
- AC line voltage calibration and temperature calibration to fine-tune performance.
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Built-in Safeguards & Reliability:
- Non-volatile memory preserves your settings even if power goes out.
- Fault detection and shutdown (e.g. high pressure, low pressure) to protect system components.
- Compressor restart time delays to prevent rapid cycling.
- Retrofit Friendly: Can replace older electromechanical switch assemblies. Compatible with most Cruisair / Dometic marine A/C units with the right display/keypad style and temperature sensor.
Compatibility and Replacement
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The SMXII AB keypad is fully compatible with original Cruisair/Dometic logic boards and fits self-contained and split gas units.
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Replacement boards (e.g., the Micro-Air A-288D) are available for legacy systems and can offer improved reliability and extended feature support.
Usability
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The SMXII control system is favored for its straightforward operation, programmable features, and reliability in the harsh marine environment.
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Installation is recommended on an interior vertical surface with rear wiring access, and the system operates on low voltage, being ignition-protected.
Additional Notes
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There are different keypad/display versions (SMXIIAB, SMXir, SMXht), but all can operate an SMXII-controlled system with the correct wiring and adapters.
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The controller features a dehumidification program, periodic circulation, and user-adjustable settings for environmental stability on board.
This controller is a standard choice for marine HVAC due to its reliable temperature regulation, simple interface, and long-term support for legacy marine air conditioner setups.
