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The Bard 8408-034BX Outdoor Thermostat - Boxed is an OEM temperature sensing switch used in Bard HVAC equipment to enable temperature based control functions such as staging, low ambient operation, or other outdoor temperature lockouts depending on the unit configuration. This part is a fixed setpoint SPDT outdoor thermostat (commonly referenced as a 75F fixed control), so it is designed to change state at its factory set temperature to signal the control circuit reliably. Use Bard 8408-034BX when you need a direct replacement for the original outdoor thermostat to restore proper system sequencing, and confirm compatibility by matching the part number to your Bard model and wiring diagram before installation.
Bard uses suffixes like "BX" to manage parts internally. These do not change the physical form or function of the part.
A part number ending in "BX" simply means it is packaged in a box for shipping, rather than for internal assembly use.
Example: 8406-142BX is physically identical to 8406-142.