Description
The Johnson Controls P47AA-1 is a steam pressure limit control engineered for reliable, automatic protection of steam heating systems. Featuring SPST switching action with contacts that open on pressure rise, this control safeguards boilers and steam equipment by interrupting the circuit when system pressure exceeds the set point — then automatically resetting once pressure drops back to a safe level.
Key Features
- SPST switching action — contacts open on pressure rise for reliable limit protection
- Automatic reset operation — restores normal system function without manual intervention
- Operating pressure range: 0 to 15 Psig for compatibility with low-pressure steam systems
- Adjustable differential: 2 to 8 Psi for precise cut-in/cut-out control
- Maximum allowable pressure: 50 Psi for safe, durable system integration
- Wide electrical rating: 120/208/240/277 Vac for versatile installation across commercial and residential applications
Specifications
- Brand: Johnson Controls
- SKU / Model: P47AA-1
- Control Type: Steam Pressure Limit Control
- Switch Type: SPST
- Contact Action: Open on Rise
- Reset Type: Automatic
- Pressure Range: 0 to 15 Psig
- Differential Range: 2 to 8 Psi
- Maximum Allowable Pressure: 50 Psi
- Electrical Rating: 120/208/240/277 Vac
Application
The P47AA-1 is ideal for use as a high-limit pressure controller on low-pressure steam boilers and heating systems. Its wide voltage compatibility makes it suitable for a broad range of commercial and light industrial HVAC installations where automatic pressure protection and reset capability are required.
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