IO Hvac Controls TWIN Twinning Kit 328140-751 Using an incorrectly sized restrictor

Using an incorrectly sized restrictor will result in combustion instability and potential safety hazards

Enhanced Safety: Reduces the risk of delayed ignition by ensuring rapid flame propagation across all burner segments

Modular TE 20 Design: Compatible with various TE 20 series valve bodies and orifice assemblies

Technicians should look for audible humming

1/8" NPT Barbed Fittings for 5/32" or 1/4" OD Polytubing

IO Hvac Controls TWIN Twinning Kit 328140-751 Using an incorrectly sized restrictorThe iO HVAC Controls TWIN Universal Twinning Kit is a field proven solution for contractors needing to synchronize multiple HVAC units under a single control point. Commonly cross referenced as the iO TWIN or TK 400, this panel enables a single thermostat to operate two separate systems, ensuring simultaneous blower and stage activation. This kit is compatible with single stage, multi stage, and heat pump equipment, supporting up to 3 heating and 2