this Resideo Aquastat sensor replacement provides the necessary NTC thermistor feedback required for sophisticated outdoor reset and thermal purging functions

and Port S is the input signal from the controlling device

This unit is a direct replacement for Lochinvar equipment and A

making it the standard for water-cooled HVAC systems requiring head pressure stabilization

High-Durability Components: Features premium materials resistant to chemical wear and thermal fluctuations

Lennox 77W93 Actuator 326010-701 this Resideo Aquastat sensor replacementThe Lennox 77W93 Damper Actuator is a high performance direct coupled actuator engineered for precise airflow control in commercial and residential HVAC zoning systems. Designed for reliability in demand heavy environments, this unit provides 35 in lb of torque and a 90 degree rotation, ensuring consistent damper positioning. This modulating actuator operates on a 24VAC DC power supply and utilizes a 0 10VDC control signal, making it a critical