Lennox 13H78 Relay 324846-701 this part is responsible for
Platform notes & fabric story
Description
Lennox 13H78 Relay 324846 701 this part is responsible for this part is responsible for gathering combustion byproducts and corrosive condensate from the secondary heat exchanger before directing them to the furnace vent system This indicates that the pressure sensed by the P499 or DPT2640 transmitter has exceeded 750 Psi