Copeland 943-0024-03 Digital Compressor Controller 15-Second with Time Delay

The Copeland 943-0024-03 is a digital compressor controller designed for use with Copeland Scroll air conditioning and heat pump systems. Operating on 24 VAC, this controller interfaces between the scroll compressor and the OEM system controller, providing precise capacity modulation, compressor protection, and built-in diagnostics.

With a 15-second duty cycle time and an integrated 2-minute anti-short cycle time delay, this unit prevents rapid compressor cycling that can cause premature wear and system damage. Capacity is modulated from 10% to 100% based on an analog demand signal (1–5 VDC), allowing the compressor to match system load with high precision and energy efficiency.

Key Features:

• 15-second duty cycle for A/C scroll compressor applications
• 2-minute anti-short cycle timer protects against rapid restarts
• 10%–100% capacity modulation range via 0–5 VDC analog demand signal
• High discharge temperature protection — lockout triggered on 5th trip above 268°F
• Locked rotor detection with 30-minute off-time response
• Low voltage protection activates below 19 VAC supply
• Discharge thermistor fault detection limits capacity to 50%
• Welded contactor detection within 2 seconds
• LED diagnostic flash codes for fast field troubleshooting
• 24 VAC powered control module

The 943-0024-03 includes terminals for connection to demand input signals, pressure sensors, the contactor, and the unloader solenoid. LED indicators provide real-time status: green for module power, yellow for solenoid activation, and red for alert/fault flash codes. This controller is a direct replacement and updated revision within the Copeland 943-0024 digital controller series.