P70KA-1C Johnson Controls Pressure Control

Overview

The Johnson Controls P70KA-1C is a high-performance single pressure control designed primarily for high pressure cut-out control, head-pressure control, and condenser fan cycling control in commercial refrigeration and air conditioning applications. It features a 4-wire, 2-circuit switch configuration that responds directly to system pressure changes, providing reliable limit protection for HVAC/R system components by opening or closing a set of switch contacts via a pressure-actuated bellows.

Features

• Heavy-Duty Construction: Equipped with an all-steel case and cover that provides rugged, long-lasting protection for internal components.
• Sight-Set Calibrated Adjustment: Displays a visible pressure scale that allows for full adjustments without removing the enclosure cover.
• 4-Wire, 2-Circuit Switch: Allows users to easily install auxiliary alarm devices or secondary control circuits alongside the primary compressor control.
• Manual Reset Lockout: Provides a trip-free lockout mechanism that cannot be overridden or reset until system pressure returns to a safe, specified level.

Specifications

• Pressure Range: 50 to 450 psig (345 to 3103 kPa)
• Pressure Differential: 60 psi (414 kPa), Manual Reset
• Maximum Over Pressure / Working Pressure: 525 psig (3620 kPa)
• Switch Action: SPST Open-High (Line-M1 Closes High, Line-M2 Opens High)
• Contact Rating: 8 Amps at 240 V (1 Phase)
• Pressure Connection: 1/4 inch Female Flare Nut with a 36-inch (3 ft) capillary tube
• Enclosure Type: NEMA 1 standard

Applications

• High-pressure cutout control for commercial refrigeration and air conditioning compressors.
• Condenser fan cycling control to regulate system head-pressure.
• High-pressure limit protection for air, water, and non-corrosive fluid systems.