Johnson Controls A28AA-29 Temperature Control R-410A this manual reset thermal switch

this manual reset thermal switch ensures the combustion chamber remains within safe operating parameters by interrupting the millivolt signal to the gas control valve if internal temperatures exceed 240°F

this specific part number is engineered for vertical furnace drain pan applications

this unit utilizes a mid-point ground configuration to ensure balanced electrical stress across the secondary windings

and 135 PSI for light oil

though heavy-use environments may require replacement every 3 to 6 months to maintain odor control efficiency

Johnson Controls A28AA-29 Temperature Control R-410A this manual reset thermal switchThe Johnson Controls A28AA 29 is a heavy duty two stage temperature control designed for precise cycling of multiple HVACR components. Featuring 2 SPDT switch action, this mechanical thermostat allows for sequenced control of heating, cooling, or ventilation equipment across a broad 30 to 100 degree setpoint range. For technicians replacing legacy components, the A28AA 29 serves as the direct Johnson Controls A28AA 81 replacement, maintaining exact