Mitsubishi Thermostat Adapter Interface - PAC-US444CN-1

The thermostat interface PAC-US444CN-1 enables the use of a third-party thermostat to control Mitsubishi Electric indoor units. It provides 3 input terminals to control fan speed: Auto, Medium, High, and custom auto. Through its CN105 connector, the Thermostat Interface allows HVAC thermostats and input/output controllers to control residential or commercial indoor units. Any system that can be controlled by the MHK1 controller model can now be controlled by a third-party HVAC thermostat or input/output controller. It works with conventional systems, but not heat pump control. The minimum terminals required are R, C, G, W1, Y1, and preferred terminals are R, C, G, W1, W2, Y1, Y2. Line Voltage Thermostats will not work with it. The PAC-US444CN-1 is compatible with almost all current indoor units offered by Mitsubishi Electric US.

Only 1 third-party thermostat can connect to 1 thermostat interface to control one indoor unit, even for an MXZ multi-zone system. It is also compatible with the PAC-SE41TS Remote Temperature sensor and MAC-331F, but M-Net and MA Control are not supported. A 12VDC power supply for MAC-33IF is required.

It should be noted that the PAC-US444CN-1 is compatible with Mitsubishi CITY-MULTI (models after April 2012), M-Series, and P-Series Indoor Units. It has been tested with Nest, Honeywell, Lyric, and INNCOM (with fan speed control) thermostats. The supported thermostats include Nest, Honeywell, Lyric, and INNCOM with fan speed control. Only one Thermostat Interface is needed per indoor unit. It provides 3 input terminals to control fan speed: High, Medium, and Low. This enables the use of Mitsubishi Electric indoor units to enjoy third party thermostat features and benefits. It is also compatible with Mitsubishi CITY-MULTI (after April 2012), P-Series, and M-Series Indoor Units.

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