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The Bard 8201-130 relay is an OEM SPDT pilot duty control relay with a 24 volt coil used in Bard wall mount and packaged HVAC equipment to switch low voltage control signals to the proper circuit, such as enabling a fan speed, heat, or cooling function based on the unit’s control logic. If you are troubleshooting intermittent operation, a no-call condition, or contacts that are sticking or chattering, replacing the relay with the correct Bard part number helps restore reliable sequencing and protects downstream components from nuisance cycling. Confirm your unit model and wiring configuration (common, normally open, and normally closed terminals) before installation, and match the coil voltage to the 24V control circuit for proper operation.