york ycch

[nique]

I have a call I need to go look into on a ycch233s. the cust, says that the slidevalve is getting stuck and won't unload. from what he is telling me it sounds like the solonoid is the problem more then the valve. I did a search on this and found zip so I am hoping that some of you have some experiance or advice. also if anybody has any bulletins on this machine that would be great. Also what other machines (M#) would have the same compressor so that I can reseach that. thanks

[Entropie]

Could be the potentiometer as well. The chiller the YCCH usually belongs to is YS.

[KnewYork]

nique, IMO you need to apply for Pro status. I won't go into the details of possible solutions for this compressor on the "open" forum.

Could be the potentiometer as well.

Unlikely. Potentiometer wouldn't prevent it from unloading.

[nique]

ya prob right, I have just never taken the time to do so.

[Entropie]

nique, IMO you need to apply for Pro status. I won't go into the details of possible solutions for this compressor on the "open" forum.

Unlikely. Potentiometer wouldn't prevent it from unloading.

You are right, but customers usually refer to the slide valve position only as indication. The corresponding motor current will tell you the truth. We don`t know if the compressor is still running, in ice storage mode, prevented from starting, tripping on low LWT, etc.

[KnewYork]

Here's a link to the IOM manual on JCI's site.

[nique]

thanks for the manual. I believe this machine uses the big spring to unload so that may be a problem. from my conversation with the cust, the unit will load and unload below 50% but once it goes over 50% it shoots all the way to 100% and then won't unload, it just stays there. so obviosly the slide valve is not stuck. He did not know if the potentiometer had ever been messed with or if the brass rod had been changed. another company has been working on this unit for some time with no luck so he asked me to come and have a look. so just trying to get some ideas before I head out.

[KnewYork]

I believe this machine uses the big spring to unload so that may be a problem.

You might want to read pages 44-45 of the manual before you go check it out.

[Southern Mech]

You might want to read pages 44-45 of the manual before you go check it out.

Is this the page that says may cause severe injury or death??

[KnewYork]

Is this the page that says may cause severe injury or death??

No, but that certainly should be taken into consideration! The pages I referenced describe the operation of the slide valve.

[nique]

I had a look at the unit today and found the following:
During the first few minutes of operation the unit will unload and load both normal and manual.
After a few minutes the slide valve will only load even if the unload valve is manually actuated.
If all the wires are removed it holds stable, until I try to unload it either electrically or manual in which case it only loads.
Luckily this has a sister chiller so I swapped the solenoid assembly and discovered no change still loading with no unload.

[nique]

Sorry its a York YS EC EB S4CRA Chiller

[frick]

have you fixed this thing yet?