Mitsubishi Electric Thermostat Interface | PAC-US445CN-1 | Works with Nest, Honeywell, Lyric & Ecobee Thermostats | Compatible with City Multi, M-Series, P-Series | 24VAC

Unlock the power of whole-home integration and customized comfort with the PAC-US445CN-1 Thermostat Interface. This sophisticated interface module serves as the essential communication bridge, allowing you to seamlessly connect your preferred third-party thermostat to a single Mitsubishi Electric indoor unit. It is specifically engineered for homeowners and building managers who desire the advanced, intuitive control of popular smart thermostats like Nest, Honeywell, Lyric, and Ecobee, while continuing to leverage the exceptional performance and efficiency of their Mitsubishi Electric system. The PAC-US445CN-1 expertly translates standard HVAC control signals into commands that your indoor unit understands, providing direct control over essential functions including Cooling, Heating, Fan-only operation, and system shutdown. A key feature is the customizable fan speed control, which offers three distinct input terminals (High, Medium, and Custom Auto) to tailor airflow to your precise comfort preferences, whether you prioritize rapid temperature changes or whisper-quiet operation. It is important to note that this interface is designed for conventional cooling and heating systems and is not compatible with heat pump control scenarios. Ideal for both residential and commercial applications, this interface connects directly to compatible CITY MULTI, M-Series, and P-Series indoor units via its dedicated CN105 and CNH02 connectors. The installation process is streamlined, requiring no complex addressing, and the package includes the necessary PAA wire harness for a simplified setup. By centralizing control with a familiar thermostat, the PAC-US445CN-1 eliminates the need for multiple remote controllers, creating a unified and user-friendly comfort management system. Please be aware that this interface requires a one-to-one relationship; one interface and one third-party thermostat are needed to control each individual indoor unit, even within a multi-zone MXZ system.

• SEAMLESS SMART HOME INTEGRATION: Effortlessly incorporate your Mitsubishi Electric system into your smart home ecosystem. This interface is fully compatible with leading Wi-Fi and programmable thermostats from Nest, Honeywell, Ecobee, and others, allowing you to manage your climate remotely via smartphone apps, create energy-saving schedules, and benefit from the advanced algorithms these devices offer for optimal comfort and efficiency.
• PRECISE AND CUSTOMIZABLE FAN SPEED MANAGEMENT: Gain granular control over your indoor unit's airflow beyond simple on/off commands. The interface provides three dedicated input terminals to select High, Medium, or a Custom Auto fan speed, enabling you to balance performance and acoustics for any situation, from quickly cooling a room to maintaining near-silent operation during sleep hours.
• SIMPLIFIED INSTALLATION AND UNIVERSAL COMPATIBILITY: Designed for straightforward integration, the interface requires no complex addressing or programming. It is compatible with almost all current Mitsubishi Electric US indoor units, including PAA intelli-HEAT models, and works with systems that were previously controlled by an MHK1 or MHK2 controller, making it an excellent retrofit solution.
• CRITICAL COMPATIBILITY GUIDELINES FOR OPTIMAL PERFORMANCE: To ensure successful operation, the interface requires a 24VAC power source for the thermostat (field-supplied) and must be connected using the minimum terminals: R, C, G, W1, and Y1. It is crucial to remember that line-voltage thermostats are not supported, and the system is designed for conventional heating/cooling applications only, as it does not support heat pump functionality, M-Net, or MA Control protocols.
• ENHANCED TEMPERATURE SENSING CAPABILITIES: For applications where the thermostat's built-in sensor may not reflect the true zone temperature—such as in a utility room or a sunny hallway—the interface supports the optional PAC-SE41TS remote temperature sensor. This allows for precise temperature monitoring directly from the conditioned space, ensuring your system delivers comfort exactly where it's needed most.