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  1. #1
    Join Date
    Jan 2011
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    michigan
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    9

    Confused Ice Rink Refridgeration

    I have a 200 hp,and a 100hp compressor, the 100 hp operates ok, the 200 hp compressor is only 1 month old and uses 2 gallons of oil every 2 weeks, the oil seperator has been cleaned and the return line new, also the float and the solinoid is new, they drained about 2 gallons out of the evaporator last week, I am thinking may bee there is some liquid slugging, or the seperator internally is not operating,the system is 40 years old. I am stumped why the oil is not returning to the compressor, the system holds 900 lb of ammonia.

  2. #2
    Join Date
    Feb 2010
    Location
    Ontario Canada
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    1,341
    Is the 200 Hp compressor working unloaded? Is the system set up so that the 200 ton is first stage? Pressures and temperatures would help....
    Never give up; Never surrender!

  3. #3
    Join Date
    Dec 2008
    Location
    Dixiana, AL
    Posts
    2,609
    Is this a direct expansion or a brine system? Is the 200 hp an addition or a replacement? If it's a replacement, has it always done this? If it's an addition, then it has always done this - is the separator in backwards?

    As has been stated, you need to give your complete operating data, and I'll add to that by saying that you need to give any info at your disposal. As it stands, we know that you have a 200 hp compressor that loses an average of one gallon of oil per week, and then the question of "why?". That ain't much to go on.

  4. #4
    Join Date
    Feb 2010
    Location
    Ontario Canada
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    1,341
    Klove;
    Good point I did not think of the separator in backwards, have you ever seen this?
    Never give up; Never surrender!

  5. #5
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    Dec 2008
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    Dixiana, AL
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    Quote Originally Posted by trouble time View Post
    Klove;
    Good point I did not think of the separator in backwards, have you ever seen this?
    Not specifically on an ice rink, but I have seen it on a low temp system once, and I've seen accumulators installed backwards. The reason I asked is to try to reinforce the notion to the OP (and anyone else that wants to ask a question here) that he knows the specifics and history of his system. But just because he knows doesn't mean the rest of us have a clue. That leaves us to say "OK, here's 1257 different reasons that you could lose oil from a compressor. Let us know what you find".

  6. #6
    Join Date
    Feb 2010
    Location
    Ontario Canada
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    1,341
    Quote Originally Posted by klove View Post
    Not specifically on an ice rink, but I have seen it on a low temp system once, and I've seen accumulators installed backwards. The reason I asked is to try to reinforce the notion to the OP (and anyone else that wants to ask a question here) that he knows the specifics and history of his system. But just because he knows doesn't mean the rest of us have a clue. That leaves us to say "OK, here's 1257 different reasons that you could lose oil from a compressor. Let us know what you find".
    Very good point, we "assume" people know what we are talking about. Temps and pressures ect ect help us all.
    Never give up; Never surrender!

  7. #7
    Join Date
    Dec 2010
    Location
    Central US
    Posts
    414
    Is this a cascade system, does it have a 2 stage oil return (3 oil receivers with heaters in each?)

  8. #8
    Join Date
    Jan 2011
    Location
    michigan
    Posts
    9
    Quote Originally Posted by rickstoys09 View Post
    I have a 200 hp,and a 100hp compressor, the 100 hp operates ok, the 200 hp compressor is only 1 month old and uses 2 gallons of oil every 2 weeks, the oil seperator has been cleaned and the return line new, also the float and the solinoid is new, they drained about 2 gallons out of the evaporator last week, I am thinking may bee there is some liquid or the seperator internally is not operating,the system is 40 years old. I am stumped why the oil is not returning to the compressor, the system holds 900 lb of ammonia.
    The suction pressure is 25 , discharge is 140-150, 17-19"f suction 185-195f, the old comp used more oil, the comp operates at 50% more than loaded up, and the seperator is in the right way, I think because the system is not loaded most of the time,

  9. #9
    Join Date
    Dec 2008
    Location
    Dixiana, AL
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    2,609
    Quote Originally Posted by rickstoys09 View Post
    The suction pressure is 25 , discharge is 140-150, 17-19"f suction 185-195f, the old comp used more oil, the comp operates at 50% more than loaded up, and the seperator is in the right way, I think because the system is not loaded most of the time,
    Does that mean it's operating at 150% of it's rated capacity? Are you using screws or recips (I'm assuming recip)? Brine or DX? What is the load running? Does the 100 hp run loaded? If it's a recip, will it pump down and hold? Condition of oil in the crankcase if it's a recip? Crankcase temps? Will the 100 make ice, or is it just to hold after the base is formed? Are you running the peak load compressor when you should be running the smaller comp to maintain? Whewww - Sorry, I'm all out of breath..........

  10. #10
    Join Date
    Jan 2008
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    windy city
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    Quote Originally Posted by klove View Post
    Does that mean it's operating at 150% of it's rated capacity? Are you using screws or recips (I'm assuming recip)? Brine or DX? What is the load running? Does the 100 hp run loaded? If it's a recip, will it pump down and hold? Condition of oil in the crankcase if it's a recip? Crankcase temps? Will the 100 make ice, or is it just to hold after the base is formed? Are you running the peak load compressor when you should be running the smaller comp to maintain? Whewww - Sorry, I'm all out of breath..........
    i'll assume he's got screws due to the seperators..............
    didja check the coaleser elements gasketing? are they secured tite?
    in my plant i have to regularly check them.
    \m/
    original member of the racoon brotherhood

  11. #11
    Join Date
    Jan 2008
    Location
    windy city
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    do need a lot more info.
    what kind of system?????????? dx. brine, liquid overfeed?
    mystery float and sillynoid is where?
    screws or recips?
    \m/
    original member of the racoon brotherhood

  12. #12
    Join Date
    Dec 2008
    Location
    Dixiana, AL
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    2,609
    Quote Originally Posted by heavymetaldad View Post
    do need a lot more info.
    what kind of system?????????? dx. brine, liquid overfeed?
    mystery float and sillynoid is where?
    screws or recips?
    The float and solenoid are the reason that I'm assuming recips - but you know about that assuming stuff...........

  13. #13
    Join Date
    Jan 2008
    Location
    windy city
    Posts
    4,430
    jah,,,
    \m/
    original member of the racoon brotherhood

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