C-5230-2 Johnson Controls LIMITER

Overview

The Johnson Controls C-5230-2 is a precision-engineered pneumatic signal limiter designed to establish adjustable high or low pressure limits within a pneumatic control circuit for commercial and industrial HVAC systems. Operating on a proportional, direct-acting principle, it maintains a strict 1:1 ratio between input and output signals within its defined mechanical limits. It effectively clamps the output signal when the input exceeds the preset thresholds, protecting downstream actuators and terminal equipment from over-pressurization or insufficient signal strength, preventing hunting, and ensuring accurate control loop performance.

Features

• Configurable for either high or low limit applications depending on the control sequence requirements
• Proportional, direct-acting operation providing smooth and responsive control
• Delivers a reliable 1:1 ratio between high and low limit settings as the supply air varies
• Features independently adjustable high or low limits with integral hypodermic needle test points
• Compact footprint allowing for easy mounting within existing control cabinets and mechanical rooms
• Low internal volume ensures a fast response time to signal variations

Specifications

• Model: C-5230-2
• Brand: Johnson Controls
• Control Action: Proportional, Direct Acting
• Ratio Between Limits: 1:1
• Supply Pressure Range: 13 to 25 psig
• High Limit Adjustment Range: 3 to 1 psig of supply pressure
• Low Limit Adjustment Range: 2 to 1 psig of supply pressure

Applications

• Designed for integration into pneumatic building automation and commercial HVAC control loops where precise signal limiting is required
• Ideal for protecting downstream devices, pneumatic actuators, and controllers from mechanical strain on valves and dampers
• Used as a minimum position adjustment for normally closed outdoor air dampers
• Well-suited for use in air handling units, VAV systems, and preventing further temperature readjustment on two-element master-submaster controllers