With a 3-inch probe

Simplified Inventory: Serves as the official VG1243AD replacement

What is the difference between open-high and open-low actions on this control

making it a versatile choice for larger residential condensers

Carrier 33ZCFANTRM Fan Controller 320819-301 With a 3-inch probeThe Carrier 33ZCFANTRM Fan Controller is a high performance VAV Fan Terminal Zone Controller engineered for precise airside management in commercial HVAC environments. As a core component of the Carrier ComfortID System, this unit integrates a factory installed actuator with a digital controller to provide pressure independent VAV control using advanced PID algorithms. Built for versatility, it supports series or parallel fan powered terminals, single