Johnson Controls A28AA-29 Temperature Control R-410A Replacing the full set of

Replacing the full set of 9 ensures uniform pressure across the header plate

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

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

it offers maximum installation flexibility for professional contractors working on high-performance HVACR systems

Johnson Controls A28AA-29 Temperature Control R-410A Replacing the full set ofThe 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