Description
The Johnson Controls A28PA-2 is a rugged two-stage agricultural thermostat engineered for demanding farm and greenhouse environments where precise, reliable temperature control is essential. Featuring dual SPDT switching and wide multi-voltage compatibility, this thermostat delivers dependable performance across a broad range of agricultural HVAC applications.
Key Features
- Two-stage control with two independent SPDT switches for staged heating or cooling sequences
- Wide setpoint temperature range of 30°F to 110°F to accommodate diverse agricultural environments
- Compatible with 120, 208, 240, and 277 VAC power supplies for flexible installation
- Fixed 2°F differential per stage for consistent, precise switching
- Adjustable 2°F to 7°F differential between stages, allowing customized staging intervals
- 1-3/8″ x 2-1/4″ coiled sensing element for accurate ambient temperature sensing
Specifications
- SKU: A28PA-2
- Brand: Johnson Controls
- Voltage: 120/208/240/277 VAC
- Switch Type: Two SPDT Switches
- Setpoint Temperature Range: 30°F to 110°F
- Differential Per Stage: 2°F
- Adjustable Inter-Stage Differential: 2°F to 7°F
- Sensing Element: 1-3/8″ x 2-1/4″ Coiled
- Control Stages: Two
Ideal Applications
- Poultry houses and livestock barns
- Greenhouses and grow facilities
- Agricultural storage buildings
- Ventilation and heating control in farm structures
The A28PA-2’s coiled sensing element provides accurate, responsive temperature measurement in open agricultural spaces, while the multi-voltage design simplifies integration with existing electrical infrastructure. The adjustable inter-stage differential gives operators the flexibility to fine-tune staging behavior, reducing short-cycling and improving overall system efficiency.
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