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K

Good luck. Let us know if it helps in your particular application.

No problem, I'll swing by Johnstone and take a look at one.............
Could be the begining of a whole new adventure !!!

no.

will look into it a bit more, just for the record, you did not mount this on a TRANE TRAC ??

This device solved the problem we had at the time on a carrier rtu. That was about 5 or 6 years now.
I don't remember the specifics about the brake, but they performed as advertised.
Might be worth looking into with regards to the rtaa problem. Of course, putting one of these on doesn't fix the underlying issues, but you might save some money on fuses and motors.

Interesting, what material is the rod made out of ??
How much time now since installed, did it do the job ??
I could make some money on these ..............!!

I've used the anti windmill device on this page
http://catalogs.johnstonesupply.com/...l.asp?page=195
on smaller carrier units that had the same problem.
Used to take care of an rtaa240 that had the same problems mentioned in this thread. Never thought to try the brake.

THE OLD FANs ON A TRANE RTAC !!!
Well for the fact of clean coils; what presents a restriction to air flow ??? A "CLEAN" coil, or an open airway between fans ???? So take your "CLEAN" coil line back to TRANE !!! How does one expect the air to come through the coils if right next to the running fan is an open area for free air flow, a baffle plate and or a cover back draft damper system would increase the air flow through the coils as needed per fan running. MAYBE< JUST MAYBE if they designed it right we wouldn't need 28 fans per chiller x 6 units here = 168 fans with a 60% fail rate so far in 4 years.

VFD !!! Yep, if your load is so low, a greater number of us are at a place that has a load that will never get low enough to have just one VFD running, and at the $$$$$$ TRANE ask for those things, I just jump out and say run you little buggers............constant 75 - 80% load 7/24.

NOW let’s talk short cycle air flow >>>>> that’s were the air coming out the top comes right around back into the side of these beast, EVEN with the required 12 feet between units we see an entering temp of 115 / 125 on a 97 deg. day, no fancy calibrated test instruments’ needed. Just walk down between them, my $1,274,852 micro chip implants on my finger tips and forehead will confirm it !!!!

So let the comments continue, may your rain suit stay dry and keep the wind at your back, that "BLUE" stuff will tell on ya !!!

Another brilliant idea, let’s have them crawl up under inside the thing to clean these coils, BRILIANT< just BRILIANT !!!

I have pulled the stator out of a 100 ton compressor before. DO NOT wish to do that again ever! In a shop with proper tools and on a work bench maybe but never again in the field.

Originally Posted by mustafaali

thanx for your replay chnrgr now i have compressor defictev on the same chiller just i want know its esy to open the compressor on the site or it required to remove it from chiller and the motor stator it can be removed easly or not

I have been told you can do it onsite but you have to know what you are doing. Most of the guys I know recommend pulling it.

Originally Posted by chnrgr

It looks like its running backwards but its actually spinning from the neighboring fan. make sure the coils are clean. I want to find some shutters to mount on the fans

thanx for your replay chnrgr now i have compressor defictev on the same chiller just i want know its esy to open the compressor on the site or it required to remove it from chiller and the motor stator it can be removed easly or not

It looks like its running backwards but its actually spinning from the neighboring fan. make sure the coils are clean. I want to find some shutters to mount on the fans

i have also same problem in the trane chiller model rtaa condenser fan runing backword durling winter time only then i have to stop all chiller and start then it will be o.k

Wouldn't a vfd go out on over current if the fan is spinning backwards while it was commanded off?

Originally Posted by jayguy

no, your NEWBIE gets wet while you drink coffee and talk up the secretary!

Make sure you give him the purple stuff. It bites real good when you get the overspray.

There are still issues as these machines get older that a coil cleaning just doesn't cure. I have clean coils and it is cool these days out there when I get failures. These compressors don't unload. It cranks up quick and cycles off not a good thing for a 100 ton pump.
Time to pull the compressors apart and do some serious surgery. Oh yea the bosses are gonna cry when they get this bill.

Originally Posted by drivewizard

but it's so much more fun to modify and tweak stuff. Coil cleaning is just BORING!! and you get all wet!

no, your NEWBIE gets wet while you drink coffee and talk up the secretary!

We have placed breakers on the individual fans to keep one that goes bad from blowing fuses and stopping / single phasing other fans.
Fins in need of combing would also increase the drag through the coils and thus windmilling.
We have some RTAAs where previous contractors sprayed water on the coils for extended periods and they have a heavy build up of minerals on them that makes this problem worse. Early RTAAs had issues with the fans staging up too slowly and needed some software upgrades. Between that and slide valve problems that often present as head pressure / oil flow problems, their solution was to spray the coils with water.

Originally Posted by jayguy

all of this talk about fixes to the issue...how about cleaning the coils? keeps the fan motors online, keeps the fan blades intact and keeps the energy bills down.


crazy ideas, i know, but it seems to work well.

but it's so much more fun to modify and tweak stuff. Coil cleaning is just BORING!! and you get all wet!

all of this talk about fixes to the issue...how about cleaning the coils? keeps the fan motors online, keeps the fan blades intact and keeps the energy bills down.


crazy ideas, i know, but it seems to work well.