The Johnson Controls P70AB-2 is a single-pole, single-throw (SPST) low-pressure control for commercial refrigeration and air conditioning systems. This open-low switch functions as a low-pressure cut-out, pump-down control, and capacity control—automatically shutting down the system when suction pressure falls below setpoint and restarting when pressure rises above the cut-in point. The all-steel case delivers rugged protection in demanding environments while accommodating a broad pressure range of 20 in. Hg to 100 psig with differential adjustment from 6 psi to 50 psi (minimum 7 psi, maximum 50 psi). A 36-inch capillary tube with 1/4-inch flare nut connects to the pressure source, and sight-set calibrated adjustment provides field configuration. Maximum overpressure rating is 325 psig.
## Technical Specifications
• **Pressure Range:** 20 in. Hg to 100 psig
• **Differential Range:** 6 psi to 50 psi (minimum 7 psi, maximum 50 psi)
• **Maximum Overpressure:** 325 psig
• **Switch Type:** Single Pole, Single Throw (SPST), Open Low
• **Pressure Connector:** 36-inch capillary with 1/4-inch flare nut
• **Adjustment Method:** Sight-set calibrated pressure adjustment; limited knob adjustment on select models
• **Construction:** All-steel case and cover
## Electrical Specifications
• **120 VAC:** 18.7 A FLA, 120 A LRA; Pilot Duty 125 VA
• **208 VAC:** 16.0 A FLA, 96.0 A LRA, 16.0 A non-inductive; Pilot Duty 125 VA
• **240 VAC:** 9.2 A FLA, 55.2 A LRA, 9.2 A non-inductive; Pilot Duty 125 VA
• **208/240 VAC:** 8.0 A FLA, 48.0 A LRA, 8.0 A non-inductive
• **Pilot Duty:** 125 VA at 120–600 VAC; 57.5 VA at 120–300 VDC
## Key Features
• Compressor protection via automatic shutdown below setpoint
• Sight-set calibration for precise field adjustment
• Horizontal or vertical mounting on flat surfaces
• 36-inch capillary tube minimizes installation constraints
## Typical Applications
• Commercial refrigeration systems
• Air conditioning systems
• Pressure control for air, water, and oil applications
## Compatibility & Integration
• Compatible with R-12, R-22, R-134A, R-500, R-502, and other common non-corrosive refrigerants
• Ammonia-compatible models available
• Suitable for non-corrosive fluid applications
