McDonnell & Miller 94-7B-HD Controller 30067439-890 using genuine HVAC tubes like

using genuine HVAC tubes like the 99AC500533 ensures exact fitment and prevents the delayed ignition issues often caused by carbon buildup or corrosion in aftermarket alternatives

eventually leading to bearing failure or a total system lockout

Key Benefits: Optimized Combustion: Includes the 100165930 flame sensor to ensure consistent flame rectification and prevent intermittent ignition failures

making it a versatile choice for both legacy and ammonia-based refrigeration plants

This surface mount temperature control features a Single Pole Double Throw (SPDT) switch

McDonnell & Miller 94-7B-HD Controller 30067439-890 using genuine HVAC tubes likeThe McDonnell & Miller 94 7B HD is a high performance head mechanism only designed for heavy duty commercial and industrial steam applications. As a critical replacement head mechanism for Series 94 and 194 controllers, this unit integrates a combination low water cut off and pump controller to maintain precise boiler water level control. Engineered for systems with a maximum pressure of 250 PSI, it utilizes a 7B potentiometer switch to provide a 135