while the internal pilot-operated mechanism allows for reliable performance across a 5-50 PSI steam pressure range and 5-150 PSI for hot water

The sensor features a 1/4-inch male quick-connect terminal for rapid field installation and is rated for extreme thermal environments to prevent premature ceramic cracking or signal loss

Mechanical failure is usually driven by a detached or unbalanced blower wheel impacting the internal walls

loud bearing noise

While the 511-624-303 is the specific OEM part for CGi-5 models

IO Hvac Controls ZPA-OTS Sensor 319852-301 while the internal pilot-operated mechanismThe iO HVAC Controls ZPA OTS is a critical NTC Type III thermistor designed for precise ambient monitoring and balance point control in residential and light commercial zoning systems. Rated at 10K Ohms @ 77 F, this sensor integrates directly with the iO HVAC ZP3 HPS ESP, ZP4 ESP, and ZP6 ESP zoning panels. By detecting real time outdoor conditions, it allows contractors to set specific high and low balance points, managing when a system should lock