While many switches look similar

It operates on a 460-volt

Humming often indicates a loose coil or debris

For heat pump applications

The Parker 08F23C2140ACF4C05 is a high-performance 1/2" 2-way normally closed solenoid valve designed for precision fluid control in industrial and commercial HVACR applications

Sensus 243-8-HP-1 1/4 Regulator R-410A While many switches look similarThe Sensus 243 8 HP 1 1 4 Regulator is a heavy duty, large capacity gas pressure regulator engineered for demanding commercial and industrial applications. This high pressure model features a 1. 25 inch NPT pipe size and a 3 4 inch orifice, making it a staple for technicians servicing industrial meter sets, boilers, and large scale furnaces. Built with a rugged cast iron body and a die cast aluminum diaphragm case, this natural gas regulator is