The TK-400 Universal Twinning/Paralleling Kit is designed to allow a single thermostat to control two separate HVAC units and can also be expanded to control a total of four HVAC units. It can be used on common or separate ducted systems with single-stage (one heat-one cool), multistage (two heat-two cool), and heat pump (three heat-two cool) equipment. Thermostats and HVAC units can be located up to 300 feet from the TK-400 panel. Only standard 18-gauge thermostat wire is required. When HVAC units share a common return and supply duct, back draft dampers should be installed and thermostat fan operation must be set for electric.

Jackson Systems LLC, 5418 Elmwood Ave., Indianapolis, IN 46203-6025; 888-652-9663; 317-227-1034 (fax);;

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