Carrier 50HJ680050 Economizer Controller

The Carrier 50HJ680050 Economizer Controller is a critical OEM replacement component designed for vertical-mount configurations in high-tonnage commercial rooftop units (RTU). As a primary logic module, this device automates free cooling by precisely modulating damper actuators based on real-time mixed air and enthalpy sensor data. By prioritizing outdoor air intake when ambient conditions are favorable, the 50HJ680050 significantly reduces the load on mechanical cooling stages, extending the service life of compressors and improving overall energy efficiency for light commercial and industrial HVAC systems.

Engineered for seamless integration, this vertical economizer controller replaces legacy ICP and Carrier part numbers, including HK50AA042 and C7660A 1008. It features advanced control algorithms that manage the transition between first-stage cooling via the economizer and second-stage mechanical cooling. For veteran contractors, the Carrier 50HJ680050 offers reliable terminal connectivity, including standard Y1 and Y2 signal routing and 24V power distribution, ensuring precise indoor air quality through controlled ventilation and damper motor modulation without the complexity of third-party universal boards.

• Optimized Energy Savings: Maximizes the use of outside air for free cooling, lowering operational costs in commercial facilities.
• Precise Damper Control: Expertly modulates outdoor and return air dampers to maintain exact mixed-air temperature setpoints.
• OEM Compatibility: Guaranteed fit for specific Carrier, Bryant, and Payne RTU models, eliminating the need for field modifications.
• Vertical Mount Design: Purpose-built for vertical cabinet configurations, ensuring easy access to dip switches and terminal strips.
• Compressor Protection: Integrated low-ambient lockout functionality prevents unnecessary compressor cycling during cold weather.

Is the 50HJ680050 a direct replacement for Honeywell C7660 series controllers?
Yes, this Carrier OEM part frequently replaces the Honeywell C7660A 1008 and several ICP part numbers. Always verify your specific model number on the unit’s data plate before installation.

What happens if the mixed air sensor is not connected?
Without a valid signal from the mixed air sensor, the controller will typically keep the dampers at the minimum position and fail to initiate economizing mode. Ensure all sensors are calibrated and wired to the correct terminals.

How do I adjust the changeover temperature?
The changeover setpoint is typically managed via on-board dip switches or potentiometers. Technicians should refer to the unit-specific wiring diagram to set the enthalpy or dry-bulb logic according to local climate requirements.

Disclaimer: While we strive for 100% accuracy, product data and specifications are subject to change. Please contact our team to confirm compatibility or technical details before purchasing.