P170MA-1C Johnson Controls Pressure Control

Overview

The Johnson Controls P170MA-1C is an All-Range Dual Pressure Control designed for commercial refrigeration and air conditioning applications. It provides combined high- and low-pressure monitoring of compressors within a single device, directly responding to system pressure changes to ensure dependable equipment protection. The unit features a high-pressure manual reset lockout mechanism, ensuring the system remains safely disabled after a high-pressure trip until it is manually cleared.

Features

• All-steel case and cover provide rugged, long-lasting physical protection for internal components.
• Sight-Set calibrated pressure adjustment offers a visible scale for straightforward, precise setpoint changes.
• High-pressure manual reset lockout prevents automatic restarting after a high-pressure event, ensuring system safety.
• Single versatile control reduces inventory requirements by adapting easily to multiple field applications.

Specifications

• Switch Action: SPST (Single-Pole Single-Throw)
• Pressure Connection: 1/4 inch External SAE Flare
• Low-Pressure Side Range: 20 in. Hg to 100 psi
• Low-Pressure Adjustable Differential: 7 to 50 psi
• High-Pressure Side Range: 100 to 500 psi
• High-Pressure Differential: Lockout requires manual reset
• Contact Ratings: 24 A Full Load at 120/240 VAC; 22 A Non-Inductive; Pilot Duty 125 VA at 120 to 600 VAC
• Enclosure Type: NEMA 1
• Compatible Refrigerants: Non-corrosive types (e.g., R-12, R-22, R-134A, R-502)

Applications

• Commercial refrigeration system compressor monitoring and protection.
• High- and low-pressure cut-out control in commercial air conditioning systems.
• Condenser fan cycling and head pressure control setups.
• Dual-pressure management across general non-corrosive fluid applications.