Daikin McQuay 668861001 Board 319852 301 Proper airflow across the furnace Proper airflow across the furnace heat strip is vital to prevent premature limit trips and oxidation of the coil surface Key Benefits for Technicians Field Replaceable Design: Modular cartridge allows for rapid hot swappable installation without removing the main base unit from the conduit this HVAC control board utilizes three 24 volt relays and integrates a return air sensor to ensure precise airflow management and thermal regulation It is frequently employed in high demand environments such as data centers and industrial facilities where maintaining specific indoor conditions is non negotiable