the Lennox 17H61 is rated for standard residential and commercial voltages

preventing cabinet vibration and improper air exchange

Engineered with a single pole single throw (SPST) electrical configuration

ideal for large-scale commercial facilities

though FHP belts are optimized for lower horsepower loads

Tekmar Controls 261 Control 320788-703 the Lennox 17H61 is ratedThe Tekmar Controls 261 Control is a reliable, microprocessor based 120Vac two stage boiler control designed for precise outdoor reset or setpoint operation. High performance hydronic systems rely on the 261 to manage boiler staging and equal run time rotation, ensuring balanced wear across multiple heat sources. By utilizing a characterized heating curve, this controller maintains a tight boiler target temperature based on real time ambient