The McDonnell & Miller 354140 is a high-precision PA-800-RX2 replacement probe engineered for field-service reliability in low water cut-off (LWCO) applications

This model is technically identical to the TH8321R1001/U

which allows for rapid access to the 100 mesh stainless steel screen without disturbing pipe connections

How do I change the ARD5TZ to a power-open configuration

depending on the run-time of the blower and the ambient dust load of the environment

Robertshaw 5500-213M Switch 318973-401 The McDonnell & Miller 354140The Robertshaw 5500 213M Infinite Switch is a heavy duty, voltage sensing replacement control engineered for precision management of resistive loads in industrial and commercial heating equipment. As a direct M Series 240V infinite switch upgrade, this unit replaces the discontinued VSI (INF) models and the Robertshaw 5500 213. It features a 22. 5% low end input capability, making it ideal for applications requiring consistent, proportionate heat