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MC3000 OBSOLETE
The Bard MC3000 is an OEM solid state lead/lag controller used to coordinate two Bard wall mounted HVAC units so they rotate runtime and provide backup operation when one unit is unavailable, which is common in telecom shelters and other critical cooling applications. This controller manages staging and changeover logic to help balance wear between systems while maintaining temperature control and continuity, making it a practical replacement when troubleshooting alternating operation, alarm conditions, or uneven runtime between paired units. Confirm your existing controller model and wiring requirements before ordering since MC3000 series controllers have multiple variants and Bard has issued newer direct replacement options for some MC3000 applications.
Official replacement(s):
MC4001
- BARD LEAD LAG CONTROL. 2 UNITS/2 STAGE