Automation Components Inc (ACI) A/20K-D4-PB Thermistor 326070-701 The spring return action is

The spring return action is fixed as Normally Closed (NC) for this specific model

Precision Modulation: Optimized equal percentage flow via the characterizing disk allows for stable hunting-free control in fan coils and air handlers

it provides uniform heat distribution around the compressor housing

Simplified Field Replacement: Reduces labor time during furnace repair by providing a complete burner set ready for immediate installation

ensuring no water can flow and maintaining the seal against potential leaks

Automation Components Inc (ACI) A/20K-D4-PB Thermistor 326070-701 The spring return action isThe Automation Components Inc (ACI) A 20K D4 PB Thermistor is a high precision duct temperature sensor engineered for HVAC Building Automation and light industrial systems. This model features a 4 inch 304 stainless steel probe and a 20K Ohm NTC sensing element, providing an accuracy of + 0. 36F (0. 2C). Designed for rapid installation, the unit includes a flame retardant ABS plastic box enclosure with a built in mounting flange and a foam vibration