Field Controls 1170004 Switch R-134A The McDonnell & Miller 47-2-M

The McDonnell & Miller 47-2-M (Part Number 132900) is a heavy-duty mechanical water feeder and low water cut-off combination engineered for commercial and residential steam boiler maintenance

element-only design allows for seamless integration into existing terminal blocks and limit assemblies

Integrated valve position indicator for accurate status monitoring

Manufactured to original equipment specifications for reliable installation

Bypassing a safety limit switch is never recommended for permanent operation

Field Controls 1170004 Switch R-134A The McDonnell & Miller 47-2-MThe Field Controls 1170004 (FTS 4) is a critical manual reset thermal safety switch designed to protect gas fired furnaces, boilers, and water heaters from hazardous flue gas spillage. This SPST thermal switch monitors temperatures at the draft hood or barometric control, effectively de energizing the burner circuit if hot gases escape due to a blocked flue or inadequate chimney draft. Engineered for heavy duty applications, it features a 140F fixed