McDonnell & Miller FS7-4S Snap Switch Refrigerant Industrial Construction: Built by Secop/Danfoss

Industrial Construction: Built by Secop/Danfoss to withstand continuous duty cycles in commercial coolers and HVAC equipment

System Reliability: The MBS 3000 pressure sensor is laser-welded and protected against cavitation and liquid hammer

This configuration is typically utilized as a safety limit or defrost trigger to ensure components do not operate in conditions that could lead to icing or mechanical failure

the TD244AP functions by sending a resistance-based signal to the Maxitrol amplifier

The Lennox 49W66 Ignition Control Board is the heavy-duty OEM replacement for legacy 790-311 and 102186-01 modules

McDonnell & Miller FS7-4S Snap Switch Refrigerant Industrial Construction: Built by Secop/DanfossThe McDonnell & Miller FS7 4S is a heavy duty industrial liquid flow switch engineered for high pressure applications where standard brass units fall short. Featuring a rugged stainless steel body and 120160 part number, this 1 1 4" NPT flow switch is rated for a maximum pressure of 1000 psi and fluid temperatures up to 300F. The single pole, double throw (SPDT) snap switch mechanism provides reliable liquid flow detection for large pipe systems,