Description
The Lennox IO‑TWIN / TK‑400 (Y3653) is a robust and expandable twinning kit that enables two or more HVAC systems to be synchronized under one thermostat. Built for flexibility and reliability, it’s compatible with various system types and simplifies control wiring while offering diagnostic feedback. Ideal for HVAC professionals and commercial installs needing seamless staging and capacity management.
Features:
- 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-gauge thermostat wire is required.
- Thermostats and HVAC units can be located up to 300’ from the twinning kit panel.
Specifications:
- Mounting: Aluminum back plate with mounting holes
- Dimensions: 8 x 6 x 1.5″
- Input Voltage: 24VAC
