Commercial makeup air furnace

[Derik]

Anybody know anything about these units!! I think it has bad contactors in control area? Have no power to burner control, transformers ect but blower kicks on! If I knew the nature of beast (order of operation) could figure it out! Any guidance would help! Thanks

[jumptrout]

Brand and Model Number?

[Derik]

Didn't find model number, but news is that I had a friend (the mad scientist) come out to give a hand and I was exactly right it was one of the contactors was bad!!! Havnt ever messed with one of these and the controls are pretty complicated compared to most rooftop or residential furnaces so glad I had a friend who does alot of commercial stuff to give me a better understanding! So it's fixed but thanks for posting back jumptrout, much appreciated!!!

[applianceman18007260692]

Probably some critter crawled under a contact at the wrong time. LOL