Yesterday I was trying to diagnose an rtu unit Lennox gas valve wasnt opening.
I was tracing it back through the system trying to understand.
Can someone confirm or correct me that when power comes in ( 240) goes to the first contactor ? Which is for what ?
Then goes to the 240/24 step down trasnformer ? Then 24 v to the board?
My board didnt have power so its safe to assume the transformer is blown?
Hello, ive been in hvac for s few years from took a few years off. Finally getting back into it.
Need help ! I have a very good basic understanding of how things work however im not to skilled on rtus
So I have 240 coming in at diconnect 110 at each leg of the first step down Transformer !
The board isn't getting power and om getting 0 to ground from the 24v side of the transformer
Is it safe to say the transformer done ?
Also earlier in the day before the Transformer stopped working in the board when the board had power I would get the borewood energize however the gas valve would not open up so I'm guessing it was a bad Transformer that was about to go in it finally went and now I don't have powers of the board is that safe to say