York YCAS0440 "High Motor Temp." code "5"

[chatless]

"Cutout" and "DSCH Unload" are still at factory settings...399 and 375..

[tjc76]

Your original post is confusing- are you tripping on high pressure, or high motor temperature?

You took 20 lbs of gas out of each circuit, and now you have zero subcooling at high condensing temperatures. Is the zero subcooling causing high superheat which is causing a lack of compressor motor cooling, giving a high motor temp alarm?

Your subcooling is lost at ambients above 105. 105 and higher zero subcooling. 95 degrees and you have 10 degrees- is there a correlation? hmm. what is the design ambient for the condenser coil, 95 or 105?

[emcontrols]

After re reading your thread, it sounds like high motor temp trips with a code 5. This may be helpfull!!!

[chatless]

Monday I will try to get the design spec's for the chiller.
It was tripping on high motor temps, even before I pulled out some refrigerant.
After the first time I had this problem summer 09, I came back when the conditions were right, all fans running and system fully loaded step 75, and removed some refrigerant to get my SC between 10 and 15deg,( closer to 10 deg ) to hopefully keep my discharge pressures a little lower next time we had a spike in ambient temp.
Sub cooling out of the economizer was 25deg and the SH was 13deg. average last summer...2010 in all the systems during the melt down day...

Thanks for the info on the 2ACE module good stuff....

[HJ Controls]

You need to check the embedded compressor temperture sensors. You either have a bad sensor or your compressor is getting to hot. Also check to see if your economizer txv is set or working properly. If you have a bad sensor I think the only way to fix it is installing a resistor. I cant remember the values. But you can call teck support and get it.

[cperk]

You need to check the embedded compressor temperture sensors. You either have a bad sensor or your compressor is getting to hot. Also check to see if your economizer txv is set or working properly. If you have a bad sensor I think the only way to fix it is installing a resistor. I cant remember the values. But you can call teck support and get it.

Also check the connections of C, S1, S2, and S3 in the comp. terminal box. If the resistance is high due to a bad connection, the motor protector sees it as a high motor temp. There's a lot of water condensation going on in there. If this is the case when you fix the connections, be sure to put some liquid rubber on them to prevent future rusting.

[freezedr]

I have 2 of the same machines you are having problems with. I found that the wiring to the motor sensors were run in the same conduit as the power feeds to the compressors. I ran new wiring in separate conduit to the sensors and eliminated most of my problems. In addition the economizer TEVs and solenoid valves have been a problem causing high temperature gas to be poured into the crankcase directly onto the motor windings.

I feel that these units are high maintenance items. The original condenser fan motors love to spin bearings because of the aluminum construction of the motor body. Oil filters, capacity control valves, transducer and broken slide valve springs have also been common. We have found that the compressors are field servicable if you have the time and you don't mind yanking the beast out of the unit. I don't do bearings but valve springs and motor windings in the case of a winding short are not too bad.

Good luck my brother in York pain

[Bklyntek]

Hi guys, bklyntek here, since we are coming into 2012 summer, hope im not too late. but do you have an economizer and have you checked to make sure its working. the economizer provides an addtl. 20' of subcooling and it is programmed to activate above 95'f ambient temps. Hope this helps out.