McDonnell & Miller FS1-J Switch Freon Rapid Heat-Up: The hot surface

Rapid Heat-Up: The hot surface ignitor reaches ignition temperature in 17 seconds or less for efficient gas-air combustion

The concave design and factory-balanced construction are engineered to minimize shaft strain and motor bearing wear

How do I wire this for a cooling-only application

For optimal service life and to prevent sediment buildup in the armature tube

enabling immediate field adaptation from natural gas to propane gas valve configurations

McDonnell & Miller FS1-J Switch Freon Rapid Heat-Up: The hot surfaceThe McDonnell & Miller FS1 J (Part Number 113550) is a high sensitivity in line liquid flow switch designed for precision monitoring in systems with low flow rates. Featuring a 1 2" BSPT connection, this model is engineered for applications where early detection of flow or no flow conditions is critical to protecting equipment like chillers or high efficiency boilers. The snap acting SPDT switch provides reliable electrical signaling, allowing for