The Bard MC4002 is a high-performance dual unit lead/lag controller specifically engineered to manage two Bard wall-mount HVAC systems in mission-critical environments like telecom shelters and equipment rooms. As a rugged solid state HVAC controller, it facilitates automated sequencing to balance equipment runtime and provides redundant cooling capacity when high-heat loads or system faults occur. This Bard MC4002 controller serves as the direct OEM replacement for MC4000 and MC4001 models, offering seamless integration with 2-stage compressors and systems equipped with economizers. To maintain peak efficiency, the unit features a lead/lag rotation logic that alternates the primary unit, preventing uneven wear and extending the operational lifespan of your mechanical hardware. Built for technical precision, the Bard MC4002 supports up to 4 stages of cooling and 4 stages of heating when configured for heat pump control. The onboard LCD provides real-time temperature data and simplified field programming, while LED indicators offer immediate status updates on active stages and lead unit designation. This base model is designed for solid state lead/lag control without alarms, providing a streamlined solution for contractors who require reliable sequencing without the complexity of remote communication or additional alarm relay boards. It is fully compatible with optional remote temperature sensors and can be field-upgraded should your site requirements shift toward networked monitoring in the future. Key Benefits Direct OEM Compatibility: Engineered as a drop-in MC4002 replacement for MC4000 and MC4001 logic boards. Multi-Stage Control: Manages up to 2 stages of cooling per unit, ideal for high-static balanced runtime applications and systems with HVAC economizers. Flexible Configuration: Supports standard air conditioners with electric reheat dehumidification or air-to-air heat pump applications. Robust Solid State Design: Eliminates mechanical failure points found in older relay-based HVAC lead/lag systems. Runtime Equalization: Automatically rotates lead and lag positions to ensure both units operate for an equal number of hours. Common Questions Is the Bard MC4002 a direct swap for the MC4000? Yes, the MC4002 is the current HVAC service part designed to replace obsolete MC4000 and MC4001 controllers. While the footprint and 24V wiring terminals are consistent, always verify your specific staging requirements and review the 2100-614K manual for any updated configuration steps. Can I add remote monitoring to this base unit later? The base Bard MC4002 does not include alarm boards or Ethernet, but it is "plug-and-play" compatible with Bard’s optional alarm relay boards and communication modules if you decide to upgrade to an AEO-optimized HVAC monitoring system later. Does this controller work with 2-stage compressors? Absolutely. It provides two distinct stages of cooling control for each connected air conditioner, allowing for proper staging of dual compressor units or single-stage compressors with an economizer. This item is not eligible for free shipping. 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.
