Another Chiller Teardown & Rebuild

[Tech Rob]

770 ton Trane CVHF, bearing failure and a worn oil seal


Removing the economizer


Economizer sealed up for storage to prevent rust


Rigging of suction elbow


Removing suction elbow


Suction elbow covered to prevent rust


Compressor and evaporator flanges covered to prevent rust and prevent debris from falling in


Preparing to remove suction cover


Removing suction cover


Rigging the suction cover down and a shot of one of the work-tables where all of the tools return when we are done with something


Checking the run-out of the 1st stage impeller

[Tech Rob]

This is where the inter-stage shaft seal mounts on the 1st stage diffuser


Looking at the motor journal bearing support with the oil seal, mounting plate, and internal oil line removed


Setting up the dial indicator to make sure we do not move the shaft too much when we remove the bearing and bearing support


Another shot of the dial indicator setup


The failed journal bearing


Dowel pins installed to make sure the bearing support goes back exactly where it was before


Removal of bearing support - we monitored the shaft at all times with the dial indicator as it could move no more than .003" in any direction


Another shot of the removed journal bearing support and the bad back oil seal


Inside the motor

[y7turbo]

Something wrong with the second post, I cant see the pictures, first post is ok.

[Tech Rob]

Something wrong with the second post, I cant see the pictures, first post is ok.

Fixed. This new site format is glitchy.

[y7turbo]

Fixed. This new site format is glitchy.

Works now, Thanks for sharing.

[Tech Rob]

Works now, Thanks for sharing.

Thanks for checking it out and commenting!

[AiResearch]

Very cool. Those of us DX guys dont get to see too many of these...disassembled anyway!

Any ideas as to the cause of bearing failure? Oil system blunder?

Thanks for sharing and keep em comin!

[y7turbo]

Any idea on what the weights were on the parts you removed?

[Tech Rob]

Economizer 840#
Suction elbow 700#
1st vane assy. 400#
Suction cover 1700#
Inter-stage 2000#

Also a couple of smaller items between 50# and 200#

[AiResearch]

Hey Rob can you describe the "air run" with the suction elbow off that you mentioned in your other tear down thread? For those of us who dont know.

Im assuming it is not to check rotation.

[gravity]

that is cool! it looks like you know what your doing

[Tech Rob]

Thanks! My motto is "fake it until you make it"!!!

[y7turbo]

"fake it until you make it"!!!

[AiResearch]

I gotcha. That makes sense.

So you are discharging atmosphere into the condenser? What happens to the motor current during the procedure?

Do you allow it to come up to speed or just bump the starter?

I would assume one wouldnt do this on a McQuay.

That would be scarier than Halloween!

[milkyway]

Thanks! My motto is "fake it until you make it"!!!

Lol., cant fake that that too much., good job rob!!
Rob for president ,,

[manny238]

Wow. thanks for sharing the pics. I would love to do a tear down like that. nice job!

[coolerinfrederick]

Wow. thanks for sharing the pics. I would love to do a tear down like that. nice job!

no you wouldn't, i helped on one and it's definitely not for me. i know my limitations and rigging is not a strong point of mine, i struggle with a 80 ton semi, no way in hell i would i ever do another tear down. much respect to the guys who do it everyday. great pics but man he got lucky with all that room to work with

[Tech Rob]

How long does this process take from start to finish???

Sent from my SPH-D710 using Tapatalk 2

For a machine like this, around two weeks to do a right proper job for the customer and to do it safely. Some are easier than others. As long as nothing crazy happened, most Carriers and Yorks can be done in about a week, I think.

no you wouldn't, i helped on one and it's definitely not for me. i know my limitations and rigging is not a strong point of mine, i struggle with a 80 ton semi, no way in hell i would i ever do another tear down. much respect to the guys who do it everyday. great pics but man he got lucky with all that room to work with

You shoulda seen the last one I posted pictures of! No overhead room, no air conditioning, no light, and a machine right next to the one we were overhauling that was constantly on the brink of surging due to messed up cooling towers!

[Nuclrchiller]

You shoulda seen the last one I posted pictures of! No overhead room, no air conditioning, ...

No air conditioning!!! The horror! Rob, you make it sound like that is unusual. I've only seen one owner with air conditioned chiller rooms. Thankfully it is a large campus with four chilled water plants. It was always a pleasure to work there.

[Nuclrchiller]

I've never seen that bearing bracket removed while the motor is still mounted to the discharge volute. Do you plan to replace the motor-to-volute o-ring? How about the discharge volute-to-condensor o-ring? Appreciate the pics. Very nice equipment room... once you get past the chilled water lines above the starter.