Description
Johnson Controls P70MA-11 Dual Pressure Control Overview
The Johnson Controls P70MA-11 is a heavy-duty dual pressure control designed for reliable refrigeration and HVAC system protection. Featuring a single-pole, single-throw (SPST) switching configuration, this control monitors both the low-side and high-side pressures simultaneously, providing comprehensive compressor protection in a single compact device. The NEMA 1 enclosure makes it suitable for indoor installations where protection from dust and light debris is required.
Key Features
- SPST (Single-Pole, Single-Throw) switching action for straightforward circuit control
- Low-side pressure range: 20″ Hg to 100 PSI for low-pressure cutout protection
- High-side pressure range: 100 PSI to 425 PSI for high-pressure cutout protection
- High-side manual reset lockout switch — requires manual intervention after a high-pressure trip, preventing automatic restart and protecting equipment from recurring faults
- NEMA 1 enclosure rated for general-purpose indoor use
- No adjustment knob — factory-set control points for simplified, tamper-resistant operation
- Dual-function design combines low- and high-pressure control in a single unit
Application
The P70MA-11 is engineered for use in commercial refrigeration systems, air conditioning equipment, and other refrigerant-circuit applications where both low-side and high-side pressure monitoring is critical. The manual reset feature on the high-pressure side ensures that a technician must physically inspect and reset the control after a high-pressure lockout event, adding an important layer of safety and preventing repeated compressor cycling under fault conditions.
Specifications
- Brand: Johnson Controls
- SKU / Part Number: P70MA-11
- Switch Type: SPST (Single-Pole, Single-Throw)
- Low-Side Pressure Range: 20″ Hg to 100 PSI
- High-Side Pressure Range: 100 PSI to 425 PSI
- High-Side Reset: Manual Reset Lockout Switch
- Enclosure Rating: NEMA 1
- Adjustment Knob: None (No external adjustment)
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