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this is an OEM 2-stage HSI board specifically designed to handle the high-stage and low-stage gas valve signals and blower speeds required for 2-stage heating systems
the VU53N1009 should be installed with the flow direction following the arrow on the valve body
including the HCDA series
Integrating this HVAC high limit sensor is essential for resolving common service issues such as frequent system cycling
Resideo Q313A1402 Thermopile 321894-708 this is an OEM 2-stageThe Resideo Q313A1402 is a robust 750 mV thermopile engineered for self powered gas ignition systems and millivolt control circuits. As a veteran grade millivolt generator, this pilot burner component utilizes a series of internal thermocouples to convert thermal energy from a standing pilot flame into the DC voltage required to hold the main gas valve open. This model features a 35 inch lead length and includes a PG9 adapter, providing the necessary
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