McDonnell & Miller 94-7B-HD Controller 30067439-890 This surface mount temperature control

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

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

or the system bypassing the necessary delay period and short-cycling during light loads

Installation Efficiency: Straight-body design with 5-foot capillary tube offers flexibility for remote bulb placement on the suction line

McDonnell & Miller 94-7B-HD Controller 30067439-890 This surface mount temperature controlThe 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