Trane Chiller Controller Bad Then Chilled Water Pumps

Had a air conditioning not working because the RTAA Trane chiller tripping on alarm. Well to see the alarm I had to first replace the air cooled chiller controller. This lead to a few repairs on the chilled water pumps and a very challenging ac service call. Enjoy hvac technician and chiller tech alike.
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[@craigforster9861]

In NY it is called a 2 pipe system.

[@jasonjohnsonHVAC]

Yup sure is. We have a decent amount here in Buffalo.

[@jweschler]

Great video. I’ve been a Trane tech for over 20 years and have started up and worked on hundreds of RTAA chillers. Those chillers are designed for 120% RLA. They won’t load up all the way in the summertime when the head pressures are the highest and the chiller is needed the most. Also, those chillers are designed for 4° superheat. Screws can take it and lower superheat keeps the motor cool. Superheat is higher after refrigerant vapor passes over motor and hits screws. I would put both those settings back to default.

[@jjjames5089]

Truly enjoy the way you diagnose equipment, great job.

[@richardbartlett6932]

I've forgotten how many of those heart dropping moments when you think to yourself "yep, switch it on and it should run up no problem.." and it doesn't. Well done for pushing through the fog of war with that bad boy

[@HVACTIME]

Ya it gets you every time too lol. This was a great one.

[@MFitz717]

Just came across your vids. I do commercial/industrial but don’t really work on any larger chillers. The interface seems similar to intellipaks which have a panel over them, that stupid how there’s no cover. Your videos have a lot of great info for someone not familiar with larger air and water cooled chillers

[@russellhltn1396]

For the fuse, there's an old timer trick - use a incandescent light bulb. At low current the filament is low resistance and the system will have near line voltage. If there's a dead short, the bulb lights, but limits the current.

[@hvacexplained9341]

ahhhhh mannnnn. I've had one of them Trane Displays bad also.. service call on a Friday, 2pm for a Retirement home... maintenance men thought it was a great time to switch the system over from Heat to Cooling for the hot summer and didn't switch so they called me and Left the facility. :( I had a hell of a time checking out the display but luckily it was just a faulty valve damper holding out the Flow switch for a chiller... Its amazing how when some equipment is installed people neglect installing Gauges, taps, sight glasses, isolation valves, etc.... That BLUE MONSTER thread sealer is some nice stuff... great investigation work... nice video ! FYI look into a Silicone / Non Conductive Ring,... Very true on Making time for the family... I fail to do that from time to time... stay safe bud.

[@EETechs]

One thing to consider with AC coils is that they have shaded pole iron cores in them and will draw a lot more current if the movable pole piece attached to the contacts does not move when the coil is energized. Judging by that contactor that had its contacts off center, I would say what happened is the contacts could not move down when the coil was energized resulting in an over current condition on that coil that blew the fuse. Seen the same thing happen on AC powered solenoid valves. Seen people replace the coils and fuses and still blow the fuse, but the actual issue the whole time was a stuck spool in the solenoid valve causing the AC coil to over amp. DC coils don't have that issue if the spool gets stuck or contacts don't engage.

[@spikester]

Its funny this problem seems everywhere, had happen on residential 24v humidifier solenoid, blew the 3A fuse to the entire furnace controls just because the spool stuck. What a way for a family to get cold due to some silly other issue unrelated to a heating system.

[@clanharris4]

I carry 1 - 8 amp car fuses with an alligator clip in a holder to allow a temp bypass on a fuse block.

[@brettwing737]

I've always called it a 2 Pipe system. Hot and chilled water simultaneously is a 4 pipe system.

[@nickyengle9668]

one of the best channels i can testify to,thanks,as no one else is doin this

[@bbasham46]

Great video!, I like your thought process.

[@allanfernando5358]

Thanks for uploading this video sir.

[@thesilentonevictor]

Great finish job

[@dayjeremy]

I'd say it was that bad contactor that caused the fuse to blow.

[@DiegoRamirez-rd7kk]

Centrifugal Chiller complete overhaul time lapse please. Very good channel man. Im subscribing

[@ramirobanda93]

Love you man!!

[@allanfernando5358]

Thank you sir , good job

[@wtfman5313]

My RTAA125 did the same thing so what I did was leave the dead one in place and wired the new one and stuck it inside the panel. No more controller replacements. It’s a 2003 model.

[@emailfilters]

4:45 - When the return is split between the chiller and the boiler by a devertimg valve, this is considered a two pipe system. The chiller and boiler supplies are piped back to the building loop supply.

[@robertwheeler8476]

Recommend you replace the fuses with an MCB

[@mansourghadhban236]

Thnxs more Nd more

[@christopherhill9119]

We mount a hinged. with a piece of sheet metal to shield from the sun as it just cooks those screens and you can read the screen better with the shade

[@scottkrisher2215]

2 pipe system

[@tobyoverton_hvacr]

I think if it was me I would have screwed a sheet of rubber above the controller that covers it but can be lifted for service so the sun doesn’t destroy it. I’m just Monday morning quarterbacking here though

[@bureaucratbayonet]

Still a good idea, little clip or hook so you can hold it out of the way

[@NROhvac]

We call it dual temp system here in Philly

[@adrianmoran1041]

Same issues with the interface. Can or is there a way to run the unit without this?

[@brianmckenna8495]

In Canada we say dual loop. Sorta like dual temp.

[@nickyengle9668]

its called changeover,your scaring me now son, go Jersey!!!

[@001tracker001]

Exposed control? 🤔 Genius! 😂

[@robertwheeler8476]

Trane created a brilliant flow switch. It had a tiny electric heater before the meter and one after the meter, It measured the resistance of the two elements. It lit LEDS to show you a percentage flow rate...... Commercial found out the cost per chiller was $300 and cancelled it. They then brought out a plastic paddle switch version which due to the design froze up during the winter.... You can't make it up!!!

[@HVACTIME]

Lol sad isn't it

[@rsesrochester8391]

The flow switches you talking about are made IFM, they can be bought cheaper from the manufacturer, Trane's markups are unreal.

[@MariMuthu-ck5ih]

Nice jop sir👍

[@carlosnaval781]

hi bro good job .. but you know bro your work is gold std.... i like to do it like.you. by the way im hvac tech..also...god bless.

[@paulgarcia458]

I think that frame the chiller is sitting on is kinda sketchy Id could n would put some 4x4 columns under it, or just something a little more substantial maybe even a few w6 beams

[@geraldgreen6278]

An amperage reading would be advised on any circuit that has blown a fuse.

[@salvadorbernardino7558]

High amps motor ?

[@allanfernando5358]

sir i see you using your left hand for switching the power on or the controls on is that safe to do.

[@HVACTIME]

It is safe, as long as you verified your work.

[@anilghuge6049]

TRANE chiller RTAD Compressor Overload Setting Informional Warning alarm

[@HVACChillin]

I’ve never heard of burning up those IFM flow sensors with no water In the system. Im curios to find out how true that is now. I always like to trim a little bit off the paddles so they don’t hit the threaded fitting.

[@HVACTIME]

I trim them if its a tight fit. I've never had a switch fail like that but manufacturers teach that it can happen

[@HVACChillin]

@@HVACTIME that’s very good to know. That could certainly ruin your day. Lol. Learn something new everyday.

[@mel904]

Suggest putting a rubber flap to cover the display.

[@rsesrochester8391]

Have you done RTAA conversions to 407c or any r-22 replacements?

[@HVACTIME]

No to the conversions

[@JackDavidson-ov2tf]

Have you done these conversions yet? If so how did it work out for you? I've had thoughts about this. Only thing is with screw compressors they are very reliable but also very sensible if you change the freon and oil. Going from mineral oil low viscoty to polyester oil

[@robertwheeler8476]

Fuses on the transformer secondary side are notorious to fail. The transformers have huge inductive loads. If you cycle the power too often, the fuse gets weak and blows. Once again.... fit an MCB

[@HVACTIME]

Ya that would be a good option. Not something ive made a standard practice.

[@christiandaveorlanda6018]

Could you help me to find parts for that model of Trane Chiller? Because I’m HVAC contractor here in the Philippines and I’m struggling to find parts and suppliers for the Trane RTAA Chiller

[@lopaka79]

Did you crack open the contactor and check if the coil varnish was cherry or wasted? Sounded like your blown fuse was on the control circuit & not on the load circuit.

[@HVACTIME]

It was and I did not but the contactor required replacement either way.

[@lopaka79]

​@@HVACTIME Good find. One of my apprentices had this issue recently and swore it had to be bad connections or control wiring. Both had merit but completely ignored the unseen loads on the control circuit. Made for a good learning experience.

[@sparkytech8787]

You need a head cam brother so you could use both hands, respect thanks for all your vids.

[@HVACTIME]

Just not my style. Ive thought about it through.

[@sparkytech8787]

@@HVACTIME interesting you guys don't use mega testing for inductive loads, only rely on ohms to ground, in australia we are taught always to use our meg except for electronics, I'll be trying my ohms from now on if I don't get a reading on ohms then I'll use my meg, Thanks for all your efforts posting these vids

[@HVACTIME]

@@sparkytech8787 we only meg on motors, but like you said only after we ohm first.

[@anthonyjacobsen5245]

it's called a changeover system when the loops are shared for both heating and cooling

[@mattcherian9489]

Two pipe or dual temp

[@rajanvishwakarma8171]

Hello sir i working trane chiller showing alarm latched folte

[@russellhltn1396]

For the display, I'd suggest installing a flap to protect the panel.

[@mjalco7410]

Dual temperature loop

[@joshstevens9826]

The other is 4 pipe. When heat and chilled are separate

[@bensaputra1567]

Helo bro i have same chiller , but lcd screen wont turn on , how can i diagnose this problem ? . Thanks

[@HVACTIME]

need to check for power

[@sman3079]

Does ur supervisor have a problem with u doing videos u are so knowledgeable with ur craft thank u

[@HVACTIME]

No, they support it

[@OleRazzleDazzler]

free advertising

[@arnoldmorales591]

What happens if my display does not work or the complete card does not work, how can I repair it 100%

[@alberto7195]

We just call them dual temp loops, also known as a 2 pipe system.

[@chrishulshof8162]

Change-over system 2-pipe in this case

[@1966jcar]

Looks better without trim in place

[@joshstevens9826]

Carrier aquasnap with the blue danfoss compressors should be 12-14° sh. Any lower u will destroy compressors

[@HVACTIME]

True, I run 12 on mine.

[@peterking1134]

‘Jump’ the fuse out temporarily using the ammeter…. Measure current…..

[@HVACTIME]

Was still nervous to jump it for same reason I didn't want to use oversized fuse. That 1u1 control module is $1000 by itself.

[@simplyfasteddie691]

Not sure if someone has answered your question?. That system would be called a three pipe system, 1 pipe heat, 1 pipe cool and 1 building piping.

[@FixItStupid]

Make Time Know That @ 67 Tech For Life ALL Way Learning Thank You, Sir

[@edubracer15]

seasonal 2 pipe system

[@salvadorbernardino7558]

Control by solenoid valves

[@MrKdebolt]

Duel temp system

[@cariocadenyc]

Dual temperature water system

[@BasketballAve]

Ouch shouldn’t be wearing jewelry when sticking your hands in an electrical box! My buddy had his finger almost burnt off when it got stuck to a contractor. Be careful out there!! Great vid anyways!

[@HVACTIME]

Its true, just stubborn to take my wedding band off. Ive had close calls before

[@GlenS123]

Teach students/apprentices 2 pipe dual temperature system. They screw steamfitters out of work, only one set of pipes for HW & CW. Buildings typically have lots of little fan coils.

[@vinathermo]

Hello, can I buy parts chiller Trane from you?

[@HVACTIME]

Do you have a local Trane supply?

[@joshstevens9826]

2 pipe

[@miket1209]

Holy shit you are the fluke

[@FixItStupid]

The Real Deal Tech That Knows

[@orlandorizzo5780]

why couldn't it just of been a replacement of the board. there is always something else !!!!!

[@HVACTIME]

Never

[@nickyengle9668]

Trane chiiler help is performed by a theoretical physacist sitting in a bunker in the tundra,expect a 4 day email in advance preempting,do your homework before ya call as he will pump thru that wiring D and lose ya w in 5 seconds,lol

[@johnmanion7068]

Decoupler

[@williamsaramosing8395]

Bro what is your email ad?

[@adrianmoran1041]

Same issues with the interface. Can or is there a way to run the unit without this?

[@michaelruivo601]

2 pipe system

[@DoeyPP]

2 pipe system