Can anyone help me with a DX comp slide valve that does
Not seem to unload. The comp always starts and runs at 70%
and sv =0.
The current limit is 60 , but comp will not unload.
Besides installing a new solenoid valve , is there any
Other tecnique to try?
Is the compressor actually pulling the amps it thinks its pulling
Yes the amp draw is correct. The compressor's trip
The overload intermittingly.
The YCAS and YCWS compressor's have a design flaw that has caused JCI to have to replace the entire chiller at several jobs. Rarely have I seen one that would unload below 65% motor current when new! The slide valve return springs are prone to breakage (several therories as to why). and when that happens several scenerios can come into play. Baltimore parts has a redesigned control valve that might help but first try this.
Go to the board that sends the 0 to 12 vdc signal to control valve and pull connector and check amp draw, allow water to rise several degrees above setpoint and reconncect vdc should go to 10vdc then check amperage.