and CLS (Closed)

you can typically upgrade from a 30A to a 40A definite purpose contactor as long as the coil voltage (24V) and number of poles match

We recommend installing a check valve at the inlet to maintain the internal water seal

making it suitable for various duct configurations

Is the Johnson Controls W43A-14 compatible with low-voltage systems

Resideo AT140A1000 Transformer 326058-757 and CLS (Closed)The Resideo AT140A1000 Transformer is a heavy duty 40 VA solution designed to provide reliable 24V power for residential and light commercial HVAC control systems. As a Class 2 step down transformer, it converts a 120V primary input to a 27V secondary (open circuit), ensuring stable operation for thermostats, gas valves, relays, and zone controllers. This unit is built for versatile field application, featuring multiple mounting configurations