Mcdonnell & Miller 354141 Long Barrel Probe 30067439-890 The 36" capillary provides the

The 36" capillary provides the necessary reach for remote pressure sensing

using the S1-025-38951-000 is critical to maintaining factory-spec resistance levels

What happens if the sensor fails

Use a multimeter to check for 24V at the terminals during the ignition trial

It is commonly used in legacy HVAC zoning system repairs where multiple SPDT contact closures are required from a single 24V source

Mcdonnell & Miller 354141 Long Barrel Probe 30067439-890 The 36" capillary provides theThe McDonnell & Miller 354141, also identified as the PA 800 U Long Barrel Probe, is a critical sensing component engineered for high performance water level detection in commercial and industrial HVACR applications. This extended barrel probe is designed specifically for use with the PS 801 U 120 and PS 802 U 24 low water cut off (LWCO) series. As a veteran technician knows, maintaining precise conductivity levels is essential for boiler safety; this