Johnson Controls P70AB-2 Single Pole Low Pressure Control

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