Bard HVAC MC4002-AC Controller

The Bard HVAC MC4002-AC Controller is a professional-grade solid state dual unit lead/lag controller engineered for mission-critical environmental control. Designed to manage two independent Bard wall-mount units, this controller ensures balanced compressor runtime through automatic lead/lag rotation. The "AC" designation indicates the factory integration of both the base alarm board and the Ethernet communication board, providing technicians with robust remote monitoring capabilities and Form C dry contact alarm outputs. This multi-stage cooling control system supports up to 4 stages of cooling and 4 stages of heating (when configured for heat pumps), making it compatible with systems utilizing economizers or dual compressors. The onboard EEPROM memory preserves all set points and logic during power loss, while the digital LCD provides real-time HVAC staging status and local ambient temperature data. Whether managing a telecom shelter or a high-density server room, the MC4002-AC offers the precise sequencing logic required for 100% cooling redundancy.

• Integrated Networking: Includes a factory-installed Ethernet board for remote HVAC monitoring and SNMP management.
• Advanced Staging: Supports 2-stage cooling per unit (4 stages total) to optimize economizer integration and compressor cycling.
• System Reliability: Automatic lead/lag rotation balances component wear, extending the service life of both HVAC units.
• Fault Protection: Features a base alarm board with Form C dry contacts for critical alarm reporting of power failures and temperature deviations.
• Flexible Logic: Fully programmable for heat pump operation or standard A/C cooling with electric reheat dehumidification options.

Common Questions

Can the MC4002-AC handle systems with economizers?
Yes, the MC4002-AC is specifically designed to manage the second stage of cooling required for proper economizer operation and 2-stage compressor logic.

Does this controller support remote temperature sensing?
Yes, it can be paired with up to two remote temperature sensors (Bard 8612-023A) to provide weighted temperature averaging for larger equipment rooms.

How is the lead unit swapped manually?
Technicians can manually swap lead/lag units by pressing the "Advance" button on the front interface, allowing for immediate rotation during HVAC maintenance.

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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.