York Yt oil foaming
Hey guys, a new member, been around a long time with big chillers, mostly Tranes, I am having a oil foaming problem, with a small YT r-11 chiller, too much refrigerant in the oil sump, heater works fine, 140deg. off, ref/oil eductor is closed off, purge ref. coil has no leaks, is this a common problem with flash off,when the vent opens momentairy drop in pressure and shut down on low diff, and any ideas on a soloution?
welcome to the site! around here, you need to give a lot of information, more is better. do not make an assumption about what is important and what isn't important...give all the info possible. and it helps to talk about pudding and asparagus since everybody seems to be talking about it in most of the threads for some reason.
as for this chiller, is the chiller pretty tight? or is it leaky? medium leaky?
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Dang, jay, you're gonna make the new guy wonder why he ever wanted out of prison just to get into an industry with a bunch'a guys that talk about pee & puddin'.
Originally Posted by jayguy
Arrow: good advice from jay. Your basic question is "The oil is foaming in the sump - what do I do?". That ain't much for me to make up a lie from. You gave a little info in that the oil reclaim is valved out and there are no apparent leaks in the purge drum coil, but those two things don't generally create problems at startup. Oil pressure? Oil level? Oil temp sensor telling you the truth? How long between shutdown and restart? Oil temp to bearings? Anyone changed the vent solenoid? What's the timing on the vent solenoid? And so on and so forth......
I fully agree with the comments before and want to add a few more questions, -which oil is used with the compressor?
-what is the saturated pressure / temperature in the chiller after it has been stopped for a while vs. oil temperature?
-does the oil foaming appear on start or during operation?
"Quality exists, when the price is long forgotten."
......[/QUOTE]Oil pressure? Oil level? Oil temp sensor telling you the truth? How long between shutdown and restart? Oil temp to bearings? Anyone changed the vent solenoid? What's the timing on the vent solenoid? And so on and so forth......[/QUOTE]
here are the questions they are looking for,, mr. arrow!
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There ya' go, M!
Originally Posted by mlkwal1
Did you ever come up with a resilution????? I had the same exact problem and i eliminated the oil cooler and changed the vent solenoid and delayed the opening for 5 min. problem solved
Early model YTs had the oil cooler laced thru the botttom of cooler, so on start up some were bad to cavitate oil pump until oil warmed up, we had success in adding AMOT to oil piping as the later versions of YTs have. this mod bypasses oil cooler until oil warms to apox 120 degrees. Also the vent valve may be hung full open dropping pressure in oil sump foaming out oil on start-up, valve is normally closed except for small port allowing some flow of gas until a few minutes has lapsed then going full open. You are fortunate to have been exposed to the best low pressure chiller ever put on market by any manufacturer! Hope this info helps.
Thanks for all the good replies replies, vent solonoid confirmed, not leaking, foaming is excessive when vent valve opens, high boiling for about 30 seconds long enough to cause pressure drop and lock out, then oil recovers, tried delaying opening beyond the initial board settings, sometimes it work, sometimes not.
The late, great Mssr. Don Bull in York engineering wrote several papers on the York YT's, OT's & HT's on this problem he titled "System Depression".
Condensing the several pages of his very wisened pages I will shorten his findings & reccomendations quite a bit.
1- Insure that the condenser water pump does "NOT" start before the start signal is initiated to the motor starter. If the condenser water pump is to be started before the chiller compressor see to it that it starts at least "8 Hours" before the chiller.
2- If problem still exists after the "Correct" starting sequence of the condenser water pump, then the start signal to the motor starter should be delayed for up to five minutes by installing a time delay relay allowing the oil temperatures and pressures to stabilize prior to the compressor starting.
R.I.P. Don, As for one....I miss your very gruff voice and reading your now collectable "Green Sheets".
Ain't "None" of us as smart as "All" of us..
So the only thing we know now that we didn't know before is that the vent solenoid has been confirmed. What was confirmed about it we have no idea, but it is confirmed, so I guess that's a good thing. Hope your chiller quits going out on low oil pressure..........
Originally Posted by arrow4
Didn't know Don had departed from us. That is a loss.
Vent solonoid does not leak by, this was confirmed by inspection and testing, thanks for the reply though