trane t stat is blowing transformer

[dwdunn1967]

I replaced a trane heat pump tsat (Tempcon 602) and i am now blowing transformers. It is going to a dual fuel kit tayplus 103a. I was able to match up the wires correctly except for one the T wire, there is not one for the new stat i thought is matched up to the F wire, becaues the T wire and the F wire were matched on the tstst install driections. The a/c and heat pump is working but the emheat is were the amps on the 24v spiking. any ideas

thanks
Dave

[jtrammel]

No DIY call a contractor.

[dandyme]

tempcon 602?

sure that thing wasn't a tcont602

now you've let the magic smoke out (it can't be put back either)

need to call someone that is capable of figuring out how that t-stat gets wired.

jt-you gonna get the dreaded message- you aren't permitted to post in any of the AOP forums without a * after your name

[jtrammel]

I have a * dandy

[dandyme]

didn't notice - never mind then.....

[catmanacman]

That t wire gets the best of many people .the t wire is only used on trane mercury bulb thermostats .

[mark beiser]

Pro tip: Fuses are cheaper than transformers, and take a lot less time to replace.

[dwdunn1967]

Thanks Im just going to rewire the whole system with a honeywell vision pro.

[54regcab]

That t wire gets the best of many people .the t wire is only used on trane mercury bulb thermostats .

I've seen the t terminal on Honeywell also. Looks just like the trane branded stat though. In either case we just don't hook up the T at all when replacing with digital. I not sure what T even does, some type of anticipation circuit ?

[jtrammel]

I've seen the t terminal on Honeywell also. Looks just like the trane branded stat though. In either case we just don't hook up the T at all when replacing with digital. I not sure what T even does, some type of anticipation circuit ?

Goes to thermistor to control cycling in heat for that thermostat

[Failure2Comply]

As stated the "T" wire was hooked to an outdoor thermistor for heating anticipation of a mercury bulb thermostat, just omit it.