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Bard part number 8620-220 is an OEM CH Series relay kit style control component used in Bard wall mount HVAC equipment to manage key system switching functions and keep operation consistent during heating and cooling calls. As a genuine Bard electrical/control replacement, this part is intended to restore proper sequencing and reliable equipment response when a relay or control function has failed or become intermittent. For best results, match the part number to your unit’s model and serial details and verify wiring and control logic in the Bard service literature before installation.