This is a Frame 4 with V.I.
A year or so back we rebuilt the slide valve and seals.
They were gummy and coming apart.
This past spring it wouldn't load sometimes so we found the main oil solenoid valve was gummed up. We replaced it.
Now it won't load again... but sometimes it will.
The oil pressures and levels are good.
When it's running at it unlaoded 20% FLA, the oil retrun line from the slide valve to the compressor is cool to cold. When it's loaded up, this line is nice and warm. I'm thinking that the small solenoid valves on the slide valve actuator are the problem.
I checked with Carrier and replacement valves (p/n: 23XL660001) are $770 each. These superseded p/n: 2TC0025D which were made by Alco.
I checked with Emerson/Alco they are discontinued. Their old p/n is: 718RA-01.
Does anybody have access to the old Alco valves 718RA-01 / 2TC0025D or better yet, repair kits for them?
Or maybe some of you think my diagnosis is wrong...
Comments or suggestions are most welcome!