Description
Johnson Controls P70MA-18 Dual Pressure Control Overview
The Johnson Controls P70MA-18 is a heavy-duty dual pressure control engineered for reliable refrigeration and HVAC system protection. Featuring a single-pole, single-throw (SPST) switching configuration, this control monitors both low-side and high-side refrigerant pressures simultaneously, providing comprehensive circuit protection in a single device. The high-side manual reset lockout switch ensures that any high-pressure fault condition requires deliberate operator intervention before the system can be restarted — a critical safety feature for commercial refrigeration and air conditioning applications.
Key Features
- SPST (Single-Pole, Single-Throw) switching action for straightforward circuit integration
- Low-side pressure range: 20″ to 80 PSI for precise low-pressure cut-out protection
- High-side pressure range: 100 PSI to 425 PSI for broad high-pressure coverage
- 36″ capillary tube for flexible installation and remote sensing capability
- High-side manual reset lockout switch — requires manual reset after high-pressure trip for added safety
- NEMA 1 enclosure for indoor, general-purpose protection against dust and light debris
- No adjustment knob — factory-set ranges for tamper-resistant, consistent operation
Technical Specifications
- SKU: P70MA-18
- Brand: Johnson Controls
- Switch Type: SPST
- Low-Side Pressure Range: 20″ to 80 PSI
- High-Side Pressure Range: 100 PSI to 425 PSI
- Capillary Length: 36″
- High-Side Reset: Manual Reset Lockout Switch
- Enclosure Rating: NEMA 1
- Adjustment Knob: None (fixed set points)
Applications
- Commercial refrigeration systems
- Air conditioning and heat pump equipment
- Chiller and condensing unit protection
- Any application requiring simultaneous low- and high-side refrigerant pressure monitoring
Why Choose the Johnson Controls P70MA-18?
Johnson Controls P-Series pressure controls are a trusted standard in the HVAC/R industry, known for their robust construction and reliable switching performance. The P70MA-18’s dual-pressure design eliminates the need for separate low- and high-side controls, simplifying wiring and reducing installation time. The manual reset lockout on the high side adds an important layer of safety, preventing automatic restart after a high-pressure fault until a technician has inspected the system. The NEMA 1 enclosure and fixed set points make this control ideal for OEM installations and service replacement applications where consistent, tamper-resistant performance is required.
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