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The Bard 8620-322 Secondary I/O Board Upgrade Kit is an OEM controls upgrade for Bard MC5000 Series wall-mount controllers, designed to expand the MC5300-C controller so it can operate additional Bard wall-mount HVAC units. This kit includes the Bard 8612-067 Secondary I/O Board plus the required cable and mounting hardware, making it a practical field upgrade when you need more input and output capacity without replacing the entire controller. Use Bard documentation and your controller model information to confirm compatibility and follow proper static protection and power isolation procedures during installation to protect sensitive electronics.