Trane RTAC Suction Pressure Comm loss

[cmedeiros]

I have an RTAC 4004 chiller with a suction pressure comm loss on circ 2 comp 2A. Would a bad suction pressure sensor give off this alarm or is the cause more likely the wiring harness itself or something else? Thank you, CM

[cperk]

I have an RTAC 4004 chiller with a suction pressure comm loss on circ 2 comp 2A. Would a bad suction pressure sensor give off this alarm or is the cause more likely the wiring harness itself or something else? Thank you, CM

I would try to rebind it first to see if that gets it working.

[Doesn'tPhaseMe]

Could be a bad device. If it has the old flat ribbon cable comm link check the plastic connector to make sure it is not loose or coming apart. You can also try this, unbind both suction press sensors on both circuits then swap them around if you can easily valve them off and rebind them again to the appropreiate circuit. See if the problem follows the sensor to the other circuit or stays with the original circuit.

[bertoh]

I have seen it 2-3 times in last few months . Moisture getting inside the plastic top of the sensor where the flat cable terminates at the sensor. You can see the green corrosion under the clear plastic. I have pulled them apart and re soldered the cable and resealed it with heat shrink, it worked, but ordered the replacement and heat shrank the rest of the Suction probes. They tend to be pointed straight up in the air, so colllect moisture easily

[cooolguy]

you can use liquid electrical tape to seal the flat cable

[milkyway]

I would try to rebind it first to see if that gets it working.

hey perk., can u tell me exactly how to rebind., is that as simple as disconnect , reset, and hook back up to wait for icp to find it?

[R123]

hey perk., can u tell me exactly how to rebind., is that as simple as disconnect , reset, and hook back up to wait for icp to find it?

Connect laptop running TechView, go to binding view, unbind the sensor by clicking on "unbind", click on "bind", use south pole magnet and hold it over senser on top by dimple to get green light to come on, click "ok", and that's it.

[Phisher]

You will need TechView software on your laptop to check the binding. Does the comm loss come and go? If it does it's probably a bad connection on the comm link.

[ChillerWisperer]

Connect laptop running TechView, go to binding view, unbind the sensor by clicking on "unbind", click on "bind", use south pole magnet and hold it over senser on top by dimple to get green light to come on, click "ok", and that's it.

Damn...anyone seen my south pole magnet...I know it's around here somewhere lol

[cperk]

hey perk., can u tell me exactly how to rebind., is that as simple as disconnect , reset, and hook back up to wait for icp to find it?

No. all of the lid sensors have a neuron I.D. If you unplug, for example, the oil temp. sensor and it has a neuron I.D. of let's say, to keep it simple, 100. Then you replace that sensor with a neuron I.D. that's 200, the machine is still looking for I.D. 100 as the oil temp. sensor. It can not be cycled or reset to pick this new sensor up, as it will show a comm. loss with oil temp. sensor. But you have to do the steps that R123 stated.

[ga1279]

ChillerWisperer- I'd like to help you, but all I have are North pole magnets. I use them to keep my pockets cool.-GEO

[chiller-thriller]

Try replacing the cable, or swapping the cable to see if the diagnostic follows.

[milkyway]

No. all of the lid sensors have a neuron I.D. If you unplug, for example, the oil temp. sensor and it has a neuron I.D. of let's say, to keep it simple, 100. Then you replace that sensor with a neuron I.D. that's 200, the machine is still looking for I.D. 100 as the oil temp. sensor. It can not be cycled or reset to pick this new sensor up, as it will show a comm. loss with oil temp. sensor. But you have to do the steps that R123 stated.


every time temp or pressure sensor is found faulty and replaced, need to rebind? only on ucp2 and 530??

[Healey Nut]

every time temp or pressure sensor is found faulty and replaced, need to rebind? only on ucp2 and 530??

Yeah but when you do UCP2 you need an east/west pole magnetic screwdriver

[notafatboy]

On ucp2, no binding. On CH530 you'll always have to bind in the new device.

[Screwit]

So does that mean the east/west pole magnetic screwdriver I went out and bought for UCP2 work was a waste of time - I'm going back Monday and demanding a refund

[Healey Nut]

I'm going back Monday and demanding a refund


They sucked you in too ???? Dont forget to take the Tartan paint back as well !!!!!
And ask for the long stand while your at the counter .

[socorrobob]

having problem with trane rtac 200 ton ,hex code 5fd comm loss:suction pressure cprsr 2a ,this occured after lightning storm. is this most likely a sensor. getting stupid as i get older, what is MP and funtional ID

[Screwit]

having problem with trane rtac 200 ton ,hex code 5fd comm loss:suction pressure cprsr 2a ,this occured after lightning storm. is this most likely a sensor. getting stupid as i get older, what is MP and funtional ID

Comm loss could be an issue with either your transducer or the comms wiring/connectors. You need to connect with TechView software to diagnose correctly.

MP is the CH530 microprocessor, all the CH530 LLIDS (Low Level Inteligent Devices)/sensors, transducers, I/O boards, EXV,s etc connect to the MP via a comms bus. Functional ID and node number is assigned to the devices during binding (TechView process for connection to the comms bus). Functional ID is identification of the LLID, e.g Suction Pressure Transducer CPSR 2A.

The attached link to Trane.com will provide some reading for a better explanation and guidance on troubleshooting

http://www.trane.com/Commercial/Uploads/Pdf/1060/rlc-svd05a-en-final.pdf

[socorrobob]

Sure appreciate help fella's.Awaiting my TechView software.after resetting this alarm it will function for about 10 minutes. Big Thankyou to "Screwit"for advice and resource info. socorrobob

[R123]

:angel:
Sure appreciate help fella's.Awaiting my TechView software.after resetting this alarm it will function for about 10 minutes. Big Thankyou to "Screwit"for advice and resource info. socorrobob

You shouldn't have to "await" TechView software as it's a free download at Trane.com.

http://www.trane.com/COMMERCIAL/DesignAnalysis/TechView.aspx?i=1435

You can download the software, buy a standard 9 pin male X female serial cable, and read the bulletin that screwit posted.

[socorrobob]

Thanks "R123" will download info and get out to this chiller in the am.

[Mr rauf]

please tell me
south pole magnetic screwdriver this is special made by trane or we can use any piece of south pole magnetic for slecting the device .

[R123]

You can use any south pole magnet. You can use any screwdriver with a magnet on the back and if it's in backwards, yank it out with pliers and put it in the other way.

[milkyway]

Good thread

[socorrobob]

yes Trane does sell a pocket size south pole magnet, happy holidays.

[BKS60]

Any magnet will work. If its to large you may light up more LED's than you want since some of the LLID's are small and mounted close together. I keep a small magnet I use to check smoke detectors stuck to the back door of my van so its easy to find.

[Nuclrchiller]

I like to use a tool already in my bag- a magnet on a telescoping handle, used for picking up small, dropped items. The wrong end is sticking out, but all I have to do is hold it sideways with the correct end near the LLID switch. It is all metal so I don't hold closer than an inch or two. It has never failed, and has never lit up a neighboring LLID.

[Mr rauf]

thanks for advise to all

[Mr rauf]

dear
i want to replace the LCD display of rtac chiller how can install the dyna view and tech view ch530 and how can save the old set points please tell me all procedure thanks for your nice cooperation.

[Mr rauf]

I want to replace the LCD/Display, can any one guide me how to replace the LCD display and how to re install the TECH VIEW and Dyna view CH 530?

[Screwit]

Mr Rauf, No offense but I suggest you would be best served by engaging a service company in your area that are familiar with this type of equipment and the work you are requesting guidance for.