The Jackson Systems TK-400™ is designed to allow a single thermostat to control two separate HVAC units. The TK-400™ can also be expanded to control a total of four HVAC units. The TK-400™ can be used on common or separate ducted systems with single stage (1 Heat / 1 Cool) multi-stage (2 Heat / 2 Cool) and heat pump (3 Heat / 2 Cool) equipment. Only standard 18 gauge thermostat wire is required. Thermostats and HVAC units can be located up to 300 feet from the TK-400™ panel. When HVAC units share a common return and supply duct, backdraft dampers should be installed and thermostat fan operation must be set for electric.

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