Trane rtu won't run from stat

[iceage]

Working on a trane rtu YSCO60E3. I can jump out for heat at unit with test 1 test 2 but no control from stat It's a trane stat and I tried a Honeywell stat i had which I know works and same result. I checked for voltage at rtrm and have 0 volts across w and r,which shows me that it is calling. Before I condemn board(rtrm) is there something I am missing? Also can you only jump these trane units with test 1 and 2 or can you you jump across w and r on terminal strip on board cause It won't start that way?

[dandyme]

was there a conventional t-stat to begin with?

or a baysens?

[iceage]

A trane stat to begin with, It has a Baysen number I believe, not sure exactly what a Baysen stat is, but it was wired by others in the same fashion as a conventional stat, what I do know is that is a warranty call and I am lead to believe that this unit never has ran, could that stat be wired in wrong spot. Right now the stat wire is on terminal strip on rtrm and on stat

[iceage]

A wireing harness on comm board was connected to rtrm board, I removed harness and was able to control rtu from t-stat.

[Trane Tech NYC]

What was the harness going to BAS?

[iceage]

Not sure what BAS is but harness was connected from comm board to j4 plug on rtrm and another harness from blower section was run to comm unit. I took off comm to rtrm harness and plugged in harness from blower section to rtrm. This way I could run my stat using standard terminal strip y,we etc. also not entirely sure what rotom is though

[thepresence]

All the trane units i've worked on if it's a trane thermostat then then any standard thermostat will not work without installing the extra thermostat board first. You should be able to jump it out though. The wiring diagram will show you which numbers need to be jumped for heat/cooling etc...

[fordrules]

If its a reliatel board you can use any stat. Otherwise you will need an interface board to use a conventional stat.

[passintyme]

On all trane boards with a reliatell board or a ucp board you can hook the outside sensor to terminal #1 & 2... This will run the system at 68 heat and 72 cool.. Or there about depending on version... If you have the older ucp( the large board)this will in essence "jump" the board out. On the reliatell you can just jumper r-w, after removing wires from 123 etc.. Terminals 1 &2 are the thermistor inputs. Term 3 is the mode input when using a baysens stat.

[iceage]

It was a reliatel board, because I was able to wire honeywell stat to board useing y,w,g etc and have control of rtu, not sure why the trane baystat would not work(tried two), wired exactly the same way on terminal strip, or maybe baystat's are wired on the 1,2,3,etc terminals on board.

On a side note I was working on anouther Trane rtu today and had a ignition board with 4 flashes on it, with ventor motor running, anyone happen to know what 4 flashes mean.

[dandyme]

before you get into these units any further; let me suggest you get all three of tranes books that deal with voyager & precedent units.

and don't be hooking anything up unless you have some idea of what it is your are attempting.

it looks like you attempted to hook a baysens on the cti portion of that reliatel board, now if tha t is greek, read the first sentence again.

[bearfromobx]

A BAYSEN device of any number isn't a thermostat. It's a sensor and control panel combination which communicates with the main control board in the unit and cannot be wired as or replaced by a standard thermostat without using an interface board (in the older generation controls) or using the conventional control terminals (in the newer generation controls).

A trane stat to begin with, It has a Baysen number I believe, not sure exactly what a Baysen stat is, but it was wired by others in the same fashion as a conventional stat, what I do know is that is a warranty call and I am lead to believe that this unit never has ran, could that stat be wired in wrong spot. Right now the stat wire is on terminal strip on rtrm and on stat