Trane RTAA-200 Temp ?

[rrd]

We are using a Trane RTAA 200 and are adding 24 additional cooling fans to chill the water before entering to RTAA 200,
I can't find any information on the temp sensor for the Evap entering temp, Like some specs. 0-100 deg ? I'm using a PLC to turn the fans on and off as needed and need to figure the voltage from the sensor = what deg.? (2v =63 F)
Trane don't even list this model any more ?

Thanks Gary

[no8no3]

Why are you trying to cool the entering water? Will the chiller not keep up? And what are you going to use to disapate this heat? Another coil? Why not just build your own chiller, and throw the RTAA away?

[Randy S.]

And a pump to grind smoke with.

[rrd]

This time of year we can svae money by using 1hp fans before the chiller, instead of 225hp to run the chiller all the time.

[chiller mekanik]

Huh?????????????????????????????

[rrd]

Ya, Thanks for the help Leon.............

[just_opinion]

RRD,

I guess you could not find the manual inside your chiller. Because the sensor spec is in the book.
You can get into Trane website to get it. Good luck of finding the sensor in other market. If you do, please let me know because i am tired of buying these sensors from Trane or from Carrier.

[chiller mekanik]

If you or anyone else can explain to me what you guys are talking about I would appreciate it.
I wasn't trying to be a wise guy, I'm really at a loss.

[double bubble]

I don't know either. mabey they were using the tower for a little free cooling .

[chiller mekanik]

He said RTAA, which is air cooled, thats why I'm confused.




I'm glad I'm not alone on this.

[double bubble]

I can picture an air cooled precooler for use in low ambiants . But I've never actually seen one .

[esdd]

There is a company making a dry cooler for this application, it has the by-pass and the valve controller installed it controlls off of the discharge from the dry cooler and ambient temp. I think the Mfgr may be Can-Fab. I saw some literature at a local mech engineers office, but don't remember for sure. I think Trane reps the unit as a free-cooler.

[txhvac]

Entering & leaving h2o temp sensors are a matched set. Rated between 15-140 degrees. They're based on 10Kohms @ 77 degrees. As temperature goes up resistance goes down. The UCP will read the DC volt signal & thats what is displayed. Hope this helps. I doubt you can find an aftermarket part, I've never tried. Try this for a pt # SEN00306.

[rrd]

Thanks, Found a spec. sheet on the Trane web site.
RLC-SVD03A-EN

[maxster]

this job is what your trying to apply this was installed with the air cooled condensers for winter run but the only thing is they are not by-passing the evap on those Tranes. it is in series so they are putting wear on the barrel when no mechanical is running.if your precooling the water back into the chiller you better have a low limit alarm or something if the fans run off and your ambient is low .....that water F into the barrel will get somebody upset bigtimehttp://img176.imageshack.us/img176/2882/p1010077cb3.jpg

[rrd]

Yes this is what we have, I'm writing a plc program to turn these fans on when the temp is below 50, shut the chiller off, and run these 1hp. fans as needed to mantain 62 deg. if the temp of the glycol gets to 60 shut down the fans also.

[jayguy]

why do you need the trane sensors spec? typically you would have a bypass valve around the air cooled if the entering water to the air cooled was cooler than the OA temp. you would usually do this with your own sensors. i do not believe the trane would be able to automatically control the air cooled fans/bypass.

[rrd]

I want to use the sensor for incoming temp to the trane.

[maxster]

how about just keeping the unit panel on and use the return water entering the barrel on the panel.

[chiller32]

rdd is a clown he can't even explain himself correctly.
I wouldn't bother helping this guy out anymore. Hes one of those guys trying to do somthing hes not trained to do.
If he was he would have explained this was a free cooling application, and probably wouldn't be asking silly questions about where to find a Trane sensor chart.

[rrd]

**** you Clown

[jayguy]

i suppose you could use a Trane sensor but i would use something else...something you are more familiar with...maybe a sensor you currently use in other projects.

Table 4, in RTAA-SB-5, page 21. sensor data for water temp sensors: -20F to 130F

32 has forgotten where he is and possibly forgotten where he came from. rrd may not quite know how to do what he wants, but he sure is trying, and i think he came to the right place to start.

good luck.

[rrd]

I wright PLC programs, I'm not a HVAC guy.

[chiller32]

Originally posted by rrd
I wright PLC programs, I'm not a HVAC guy.

Well its good to know you "write" PLC programs and your NOT a HVAC guy. But since when is using a GUI with cut and past logic icons considered writing a program? My 16 year old daughter could do that, plus she knows how to spell. <---- LMAO ----> Just so your not lost GUI stands for graphical user interface. Leave the HVAC and programming to the professionals plant puke!




/* Here is a real progam */

#include<stdio.h>

int main()
{
int counter;

for ( counter = 0 ; counter < 10 ; counter++ ) {
printf ( "\nThis is writing a real program plant puke!\n");
}

return 0;

}