Original message
| ThermalTM
|  "York Chiller"
, posted Sat 3 Sep 22:58  
I am having a problem with the 2nd compressor dropping off for high amps. The unit is not loading correctly. The digital readout always shows the slide valve position at 0. The #1 compressor works fine. The I/O board is as far as I can get to with the documentation I have. I don't like being a parts replacer, especially when it comes to expensive circuit boards. I am no electronics wiz but a I would like to determine that the I/O board is getting the correct readings from the main processor board. I believe the compressor is over loading because the control is showing it unloaded but it is fully loaded. From what I gather the solenoid gets varied DC volts from the processor to move through the loading steps. Full voltage for unload, no voltage for full load. If Voltages are good how about the slide valve in the compressor? Where can I get info on the compressor? York is no help! Any suggestions?
Listen Look and Think. You may figure it out!
|
|
Replies:
|
| gizmo52
| "Re(1):York Chiller" , posted Fri 7 Oct 16:59
This is curious.I'm having the same problem with a ywcs0180 unit.Our unit was just installed and has yet to be comissioned because of this problem. Iwas under the impression that it was just the opposite of what you stated about the loading. It loads in steps 0-75,0 being unloaded and 75 being loaded fully. Anyway,I did notice that if you take a volt reading on J12 on the I/O board,as it steps up the loading- the dc voltage goes up.I have seen no feedback as this appears to be open loop control. Anyway, the slide valve on our unit appears to be stuck so the YORK rep. is coming Monday with recovery equipment to pull her down and work on the slide. I can give you our results hopefully on Tues. 10/10/05. We are showing full current and the controller is saying 0 loading.
|
| chiller guy
| "Re(1):York Chiller" , posted Mon 5 Sep 19:47
What unit do you have? The panel should unload the compressor to prevent a shutdown if overloading. This may sound silly but have you considered swapping parts within the unit( if there are any that are interchangeable). Have you eyeballed the slide valve during these problems? Do you have a feedback from the slidevalve that is not working/connected that is providing a false signal? Check all them little wires for good connections.
Check the easy/simple things first. The electronics are pretty dependable but do hic-cup on occassion. Is this a screw chiller?
All refrigerants are safe - All refrigerant are dangerous. The difference is YOU !!!
|
|
|
