Johnson Controls A19AAF-4 Thermostat 30067439-890 effectively prohibiting pressure mixing between

effectively prohibiting pressure mixing between separate control loops

Using higher voltage will destroy the coil instantly

allowing for a plug-and-play installation that doesn't require breaking the flue connection

High-Purity Silicon Carbide: Resists oxidative wear and maintains stable electrical properties across thousands of cycles

Common Questions Is the Robertshaw 41-802N compatible with 80% and 90% AFUE furnaces

Johnson Controls A19AAF-4 Thermostat 30067439-890 effectively prohibiting pressure mixing betweenUtility Thermostat, 120 208 240 Vac, 40 90 Degree Temperature Range, 1. 5 Degree Fixed Differential, 6' Rubber Coated Capillary Length, Automatic Reset, Screw Driver Range Adjuster A19AAF 4 is identical to A19AAF 4C