Frick XJF shaft seal failure

[evapcoil1]

Hi Guys
I'm having some problem after We carry out the maintenance on the compressors (without touching the shaft seal), when We need to do the vacuum, sometimes the shaft seal is not holding the vacuum , any suggestion on how to solve this problem and why this happen?
Grazie
Thank You
Gracias
Spaciba
Danke
Dankje

[josef]

Pour oil.

[evapcoil1]

Hi Josef ,We use Solest 180, the oil is sent to the lab to be tested every 6 months, so if the oil condition fall below standard ,We replace it, the filters are replaced regularly...
Can still be the oil?

[josef]

You have a dry shaft seal-free oil, grease and hand turn, then your shaft seal will leak.
On the lid, the tube is passed and inject oil if you do not remove.

[evapcoil1]

Sorry Josef , can you explain it a little better?

[RANGER1]

Vacuum will disturb elastomers in shaft seal .
If their condition a detriorated it will leak . Sometimes it will seal again after re-pressurization .

If its ammonia purge it or I think josef is saying pack outer area around seal with a grease seal so vacuum can't suck air in .
Not much else you can do except instal different type of seal like welded metal bellows if suitable .

[evapcoil1]

Thank You mate!

[Grizzly]

Hi evapcoil 1.
I suspect that Rangers advice may well point to the route of your problem.
However you may be lucky and be experiencing a problem a lot of the earlier screw comps had.
That is when left idle for any length of time the shaft seal faces dried out.
This is because their S/S design allowed the oil to drain away from around the carbon face of the shaft seal.

I know Josef is very familiar with these compressors and I suspect what he is saying is lubricate around the shaft seal drive.
I am not sure as to whether that will work but one "Trick" I used to use on the Howdens, from my marine day's.
Was to get some Electricians putty ( which is similar to Plasticine) roll out a sausage and wrap it around the drive shaft.
Sealing between the shaft and comp body.
The seal is usually good enough to allow a vacuum to be pulled.
Using this method I have even had successful 24hr drop tests, where they have failed prior to using the putty.
If you are lucky this trick will work and restarting the machine will reseal the dried out shaft seal.
It may be worth a try?
Good luck grizzly.

[evapcoil1]

Thank You Grizzly! Sometimes the simple ideas are the best ideas....
Grazie Guys!!!

[Segei]

Do you really need vacuum? Sometimes good mechanical seal starts leak after vacuuming.

[evapcoil1]

Segej r u serious??
Let's say You have the unit open for two days, after 48hrs of open air ,You don't vacuum? May be in the caribbean with 35˚C and 75%rh… Or is still an acceptable practice to just vent refrigerant in the atmosphere???? I hope not, because if so our category just went back to the stone age!!!!!

[Segei]

Segej r u serious??
Let's say You have the unit open for two days, after 48hrs of open air ,You don't vacuum? May be in the caribbean with 35˚C and 75%rh… Or is still an acceptable practice to just vent refrigerant in the atmosphere???? I hope not, because if so our category just went back to the stone age!!!!!

It doesn't matter how many hours unit was open. You won't put more air in the unit then volume of this unit. If you have a purger it will do the job. If you don't have purger... I hope that you are not in stone age!!! If you don't have a purger, purge the air in the water not in the atmosphere You can do this if you have ammonia.

[josef]

Hi, evapcoil1, you react angrily and Sergei advise you well in your distress.
I'm sorry but the translator turns my thoughts in the attached PDF and the positions of 96 you can add oil to the shaft seal.
This problem points to the early exchange.

[evapcoil1]

Sorry Guys for my quick reply , I'm used to work HFC plants ,so differently than ammonia plant.... My bad...
Thank You again for all the good advises....
I hope no hard feeling are left...

[Grizzly]

Hi, evapcoil1, you react angrily and Sergei advise you well in your distress.
I'm sorry but the translator turns my thoughts in the attached PDF and the positions of 96 you can add oil to the shaft seal.
This problem points to the early exchange.

Good advise there my friend.
Thank you, I learnt something else today.
I wondered how you were expecting us to "wet" the shaft seal!
Grizzly

[evapcoil1]

Great advise and very clear... Thank You!
I have a question , is this operation valid also for the XJF95?

[josef]

I believe that file help, rotate hands and be good.

[Lodiev]

Hi Josef it sems to me u know The XJF quite well.I just overhauled one without a manual and i am stressed that the shaft seal wil not hold becaurse of the input shaft,s bearing configeration. can u help me with a manual or advice?