For service technicians maintaining Reznor unit heaters

provided the vent pipe and heat exchanger are clear

extending service life in high-ambient environments

it can serve as a functional replacement in other 20kW systems if the voltage and timing specifications match

The Nordyne 621891 operates with a CCWLE (Counter Clockwise Lead End) rotation

Warrick 16MB1A1 8 Pin NEMA Els PW 17895 For service technicians maintaining ReznorThe Warrick 16MB1A1 is a high performance Series 16M conductivity liquid level control designed for precise point level sensing. Operating at 120V AC, this 8 pin plug in controller features a fixed sensitivity of 10K ohms, making it ideal for standard water applications and moderate conductance liquids. Housed in a NEMA 1 enclosure, this unit facilitates reliable single level or differential level control in commercial and industrial HVACR systems.