The twinning kit is designed to allow a single thermostat to control two separate HVAC units. It can also be expanded to control a total of four HVAC units. The twinning kit can be used on common or separate ducted systems with single stage, multi-stage and heat pump equipment. Only standard 18 ga thermostat wire is required. Thermostats and HVAC units can be located up to 300 ft from the twinning kit panel.

iO HVAC Controls Universal Twinning Kit Panel, 24 VAC, Back Plate Mounting, 6 in W x 1-1/2 in D x 8 in H Dimensions, For Use With: 1-Stage or Multi-Stage Heat Pump

• Easy to install and setup
• Uses standard 18 ga thermostat wire
• Reduces installation time and cost
• Can be used with the lead/lag controller

• Full Engineering Drawing https://assets.unilogcorp.com/267/ITEM/DOC/iO_HVAC_Controls_IO_TWIN_Full_Engineering_Drawing.pdf
• Instruction/Installation Manual https://assets.unilogcorp.com/267/ITEM/DOC/iO_HVAC_Controls_IO_TWIN_Instruction_Installation_Manual.pdf