Patterson-Kelley 26-0000-0296 Pressure Switch 321894-709 The 4L500 features a 1/2-inch

The 4L500 features a 1/2-inch top width and a 50-inch outside circumference

It is also found in many A

The HRF-C1 is the current manufacturer-sanctioned replacement part that supersedes the discontinued 16216 part number

Technicians should check for continuity and verify resistance using a multimeter

Patterson-Kelley 26-0000-0296 Pressure Switch 321894-709 The 4L500 features a 1/2-inchThe Patterson Kelley 26 0000 0296 Pressure Switch is a precise safety component engineered for high efficiency commercial boiler gas trains. As a dedicated low gas pressure switch, this device monitors supply pressure to ensure the burner operates within safe stoichiometric parameters. Designed for integration with the Patterson Kelley ENVI and NURO control systems, it provides a critical interlocking function that triggers a safety lockout if fuel