P170LB-1C Johnson Controls Pressure Control

Overview

The Johnson Controls P170LB-1C is a high-performance dual pressure control designed primarily for commercial refrigeration and air conditioning systems. This compact unit combines both high- and low-pressure controls into a single device to monitor and regulate system pressures directly, protecting refrigeration compressors from damage. It features a heavy-duty, all-steel case and cover that provides rugged, long-lasting protection for internal components in demanding environments.

Features

• Dual Control: Combines high-pressure cutout and low-pressure control functions in one unit to monitor both sides of the refrigeration loop.
• All-Steel Construction: Features a durable steel case and cover designed to protect the internal components against harsh environmental conditions.
• Sight-Set Calibrated Adjustment: Provides a highly visible pressure scale, allowing technicians to check and easily adjust pressure settings through the range without removing the cover.
• MICRO-SET Differential Option: Equips the device with an adjustable differential on the low-pressure side for precise control in critical low-pressure applications.
• Long Life Contacts: Engineered with a robust internal switch structure that ensures bounce-free contact closures and reliable electrical lifespan.

Specifications

• Model: P170LB-1C
• Switch Action: Single-Pole Single-Throw (SPST); opens or closes on pressure changes
• Pressure Connection: 1/4-inch male external flare connector
• Low Pressure Range: 20 in. Hg to 100 psi (-68 to 690 kPa)
• Low Pressure Differential: Adjustable from a minimum of 7 psi (48 kPa) to a maximum of 50 psi (345)
• High Pressure Range: 100 to 500 psi (690 to 3,447 kPa)
• High Pressure Differential: Non-adjustable, fixed at approximately 65 psi (448 kPa)
• Enclosure Rating: Standard NEMA 1 enclosure protection
• Electrical Ratings: Supports standard single-phase AC motors (e.g., 20 FLA at 120 VAC, 17 FLA at 240 VAC) and pilot duty applications up to 600 VAC

Applications

• Commercial Refrigeration: Ideal for controlling and limiting dual pressure levels in supermarkets, cold storage, and food service coolers.
• Air Conditioning Systems: Widely used as a compressor safety control switch in commercial HVAC equipment.
• Non-Corrosive Fluid Systems: Suitable for use with most common non-corrosive refrigerants across industrial cooling applications.
• Compressor Protection: Functions as an operating or limit control to prevent low suction pressures or dangerous high head pressures.