For technicians servicing residential or light commercial units

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

including low-GWP options like R454C and R1234yf

Each pressure switch is calibrated to a specific set point

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

IO Hvac Controls ZPA-OTS Sensor 319852-301 For technicians servicing residential orThe 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