If your vacuum stood with no pump at 300 for 72 hours you dont have a leak. You may have had one like a relief but you think you would have seen evidunce of that. Put oil in the reliefs or balloons on them. If you really thing theft is an issue get a camera on it. Perhaps even a game camera if its secluded where it wouldnt constantly take photos of people on the other side of the fence.
One of our chillers only leaked while the oil pump was running. Is it an open drive?
YOU CAN MAKE A LEAK TEST IN THE TERMINAL BOX OF THE COMPRESSOR AFTER YOU CHARGED IT WITH NITROGEN (WE FOUND IT BEFORE )
DONT FORGET TO CUT THE POWER OFF
I have had to replace the oil feed line valves on my YCAS. During the winter the valves would leak because of shrinkage. I put in some good isolation valves and have not had the problem since.
O-Rings can start leaking under cold conditions and reseal after it warms up. I suspect the oil separator sight glasses, could be such point. But i would also check out the motor terminal gaskets on the compressor. Best is, to wait until low ambient temperature reoccur and then check during this time.
"Quality exists, when the price is long forgotten."
Same here,main chiller shut down for the so-called here in
Florida. Bldg. would run small 300 tn chiller. Summer came
Large 450tn, lost partial charge, loaded with air(low pressure)
After spring start-up, and after a months run time,went back.
I put my compound gauge on purge exhaust and watched it
Pull down to avacuum. Wasnt seating correctly. Replaced it &
Did good after that, while I was working for York then
I tend to believe in the o-ring theory but I would like some more info.
1st. What type of air cooled are we speaking of ?
2nd. Is the power for this Chiller being turned off to winterize ?
Because o-rings will shrink with colder temps and expand with higher temps.
A mind is like a parachute. It doesn't work if it is not open.
The best part of going to work is coming back home at the end of the day.
Hard work spotlights the character of people: some turn up their sleeves, some turn up their noses, and some don't turn up at all.
Well we've done two leak checks over the winter and found nothing. Air cooled as in air cooled condenser, no cooling tower.
You really pulled that circuit down to 300 microns and it held for 72 hrs? No outgassing, no rise at all? I'd say you've got a pretty tight circuit or broke micron gauge. This has been going on for 6 yrs? How about recovering the charge for storage before winter shutdown, and put the charge back in the Spring. What type of machine is this? Hope this helps.
Sic Semper Tyrannis.
I can understand ur frustration, it may b in the cooler bundle.
York56,please confirm aren't cooler (pudin locales) rated to
150psig. OP. inquire or check if they issues w/air in the loop
System. Sometimes it Can go unnoticed by maint. Personnel.
Its happened before, 2x since I've been in thee field.
Can happen. Hope this helps.
It has been going on for 6 years, but it doesn't happen every winter. Pulling the charge for the winter is an option we talked about, but my boss wants to solve the problem. It was a rather mild winter in Wisconsin this year, not sure if that changed anything or not. I guess well see at start up.
Since it is a York screw,only saw this once,after the repairs
Were made. There have been leaks associated w/the bottom
Of the oil separator nut. Usually leaves some residue behind.
I have found compressor terminal seals leaking on air cooled chillers. Same symptoms as yours, with everything appearing tight. When the compressor is warm no leakage, let the weather get to below 40 and compressor not running and the terminals leak. Look for oil stains around the compressor terminals. If unit is off line and weather is not cold, try packing bags of ice on the compressor and leak test with motor sensor temperature as low as you can get it.