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the VU53N1009 should be installed with the flow direction following the arrow on the valve body
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
Integrated Safety: Features a built-in
including the HCDA series
Common Questions How do I test if a fusible link is blown
Resideo Q313A1402 Thermopile 321894-708 the VU53N1009 should be installedThe 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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