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Thread: Trane 100 Ton

  1. #27
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    Quote Originally Posted by sds5150 View Post

    It still wonder about the internal design of the evaporator. It is strange that Circuit 1 would work, but not circuit 2.
    Phisher nailed it. Circuit 2 is closer to the EWT sensor, therefore with low flow the temp drops there first.

  2. #28
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    Wink FT. of water?

    Quote Originally Posted by Phisher View Post
    Your right it is "ft of water" not psid. Not the first time if spoken without thinking first.
    Its actually "ft. of head".......pd times 2.31 equals ft. of head....which allows you to find gpm....Mike

  3. #29
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    Quote Originally Posted by workinschlep View Post
    Its actually "ft. of head".......pd times 2.31 equals ft. of head....which allows you to find gpm....Mike
    "ft. of head" of what liquid? If the liquid is not water, then you must factor the specific gravity of the liquid. The term "head" was adopted as the industry standard when referring to pumps. I posted the flow chart from the RTAA IOM. I'll let you read it for yourself.
    Attached Files Attached Files

  4. #30
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    Quote Originally Posted by Phisher View Post
    "ft. of head" of what liquid? If the liquid is not water, then you must factor the specific gravity of the liquid. The term "head" was adopted as the industry standard when referring to pumps. I posted the flow chart from the RTAA IOM. I'll let you read it for yourself.
    That is something I hadn't considered...thank you..I just found this sight and found it pretty interesting.

  5. #31
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    Quote Originally Posted by workinschlep View Post
    That is something I hadn't considered...thank you..I just found this sight and found it pretty interesting.
    No problem. Welcome to the site. I learn more on this site then I do in training classes.

  6. #32
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    workinschlep,
    Just a word of advice. Guys on this site like to check profiles for credentials before responding to posts. Update your profile and get your post numbers up so you can apply for pro membership.

  7. #33
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    Quote Originally Posted by Phisher View Post
    "ft. of head" of what liquid? If the liquid is not water, then you must factor the specific gravity of the liquid...
    or pudding. it could be be pudding. what IS the specific gravity of pudding? i suppose that it would depend on flavor and whether it was made of whole milk or skim....google time!
    When I am late for work, I usually make up for it by leaving early.

  8. #34
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    Quote Originally Posted by jayguy View Post
    or pudding. it could be be pudding. what IS the specific gravity of pudding? i suppose that it would depend on flavor and whether it was made of whole milk or skim....google time!
    I don't think flavor plays a factor but milk on the other hand changes everything. Now I'm hungry for some pudding. Thanks jayguy

  9. #35
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    FOUND IT...sorta!

    Density of water: 62.43 lbs/ft^3

    Chocolate pudding: 59.631 lbs/ft^3

    from now on...let us all convert all densities into the density of chocolate pudding and confuse the crap out of everyone!
    When I am late for work, I usually make up for it by leaving early.

  10. #36
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    UPDATE

    I added some details to my profile....if anyone's interested...thanks

  11. #37
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    from now on...let us all convert all densities into the density of chocolate pudding and confuse the crap out of everyone!

    But what if you dont like chocolate ??????
    Why not tomato soup ????
    Or strawberry yoghurt ??
    The 64 roars to life Whoo hoo ...shes a rolling chassis .
    You bend em" I"ll mend em" !!!!!!!
    I"m not a service tech.. I"m a thermodynamic transfer analyst & strategic system sustainability specialist
    Best Austin Healey In Show twice in 2013 .....All those hrs paid off .

  12. #38
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    Quote Originally Posted by graham View Post
    ...But what if you dont like chocolate ??????
    Why not tomato soup ????
    Or strawberry yoghurt ??
    perfectly acceptable buddy!

    but as was mentioned before...you just need to specify...like 'feet of head' or 'feet of water' or 'feet of pudding' or 'feet of tomato soup'
    When I am late for work, I usually make up for it by leaving early.

  13. #39
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    I've got an RTUA 70 with the exact same symptoms.

    At start up, only with circuit #2, EWT at sensor drops quickly while LWT sensor doesn't change much, and it will lock out.

    There are no provisions at chiller barrell for measuring pressures. I just found the curve for the chilled water pump and am going back to take those measurements, but I have a feeling I will find the flow to be within specs, maybe even above specs.

    Pumps from and back to an open tank. There is a filter device in the line, but when I asked the maintenance man about it he said there were no bags in it, haven't been for years. The water in the tank looks like the creature from the black lagoon would be comfortable in it.

    I'm guessing at this point that the chiller barrell is fouled, or the baffles are damaged in some way. The 1/4 inch nipple off the top of the barrell on the outlet side, used for an air vent, was plugged with crap.

    Sensors read identical when neither circuit is running and temp stabilizes thru barrell.

    Is it possible that the LWT sensor may be covered in crud, slowing it's response time in relation to the EWT sensor?
    Or could a problem with the EXV or unloaders cause this on start up, maybe especially at colder ambient?

    Is there anything else, not flow related, that would cause this?

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