Description
The Johnson Controls A28AA-36 is a heavy-duty two-stage temperature control engineered for precise, reliable performance in commercial and industrial HVAC applications. Featuring dual SPDT switch action, this controller enables sequential staging of heating or cooling equipment to maximize energy efficiency and maintain tight temperature management.
Key Features
- Two-stage control with 2 SPDT (Single-Pole, Double-Throw) switch action for sequential equipment staging
- Wide voltage compatibility: 120/208/240/277 VAC — suitable for a broad range of commercial electrical systems
- Setpoint range of 40°F to 90°F for versatile heating and cooling applications
- Fixed 3°F differential on each stage for consistent, stable switching
- Adjustable 2–7°F differential between stages, allowing fine-tuned control over stage sequencing
- 3/8″ x 5-3/4″ sensing bulb for accurate temperature measurement in the controlled medium
- 6-foot capillary length provides flexible installation reach to remote sensing locations
Specifications
- SKU: A28AA-36
- Brand: Johnson Controls
- Control Type: Two-Stage Temperature Control
- Switch Action: 2 SPDT
- Voltage: 120/208/240/277 VAC
- Setpoint Range: 40°F – 90°F
- Differential Per Stage: 3°F (fixed)
- Adjustable Differential Between Stages: 2°F – 7°F
- Bulb Size: 3/8″ diameter x 5-3/4″ length
- Capillary Length: 6 feet
Application
The A28AA-36 is ideal for use in commercial HVAC systems requiring two-stage temperature control, such as multi-stage heating or cooling equipment, air handling units, and refrigeration systems. The adjustable inter-stage differential allows technicians to customize the control response to match system requirements and prevent short-cycling. The multi-voltage rating makes this controller a flexible choice across a wide variety of commercial building electrical configurations.
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