Johnson Controls T-4002-9009 Pneumatic Thermostat Els PW 17895 With its Class H insulation

With its Class H insulation

What are the symptoms of a failing furnace pressure switch

making it an essential component for furnace control boards

this manual stem kit allows for physical actuation of the valve during system evacuation

Look for visible signs of "swarf" or metallic debris near the hub

Johnson Controls T-4002-9009 Pneumatic Thermostat Els PW 17895 With its Class H insulationThe Johnson Controls T 4002 9009 Pneumatic Thermostat is a high volume output single temperature controller specifically designed for facility managers and HVAC technicians who require precise proportional control in commercial settings. Operating on a reverse acting sequence, this thermostat increases its branch line pressure as the ambient temperature decreases, making it ideal for managing heating and cooling applications through 2 pipe pneumatic