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the 42-21268-04 is the recommended current superseding part for those legacy numbers
5 inches in length with a 1-7/8 inch mounting hole spread
This module is essential for commercial HVACR applications requiring reliable digital temperature monitoring and field-level troubleshooting
Advanced Thermal Material: Constructed from premium silicon carbide to withstand intense thermal shock and maintain structural integrity over thousands of ignition cycles
ensuring consistent thermal cycling without the modulation lag found in standard throttling valves
McDonnell & Miller 94-M Pump Controller R-22 the 42-21268-04 is the recommendedThe McDonnell & Miller 94 M is proof of heavy duty reliability for high pressure steam applications, serving as a robust combination low water cut off and pump controller. Designed specifically for steam boilers with a maximum pressure of 250 psi, this unit utilizes manual reset SPDT switches to ensure precise water level management and failsafe protection. The dual snap acting switches prevent rapid cycling, reducing mechanical wear on your pump
