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  1. #14
    Join Date
    Jul 2010
    Posts
    17
    I'm in the process of obtaining new water temp gauges for feed and return. And I'm also replacing the garbage pressure gauges.

    As for flow reading, I'm finding out about an inline flow meter to properly read the amount of flow.

    I swear, taking over someone's headache is a bigger headache.

    Apparently the second chiller unit adjacent to this one has been down for 5 years. I'm starting to wonder if this chiller alone can handle the load. But the on site mechanic states that it's been doing the job.

    I also noticed a sound from the expansion valve on one of the compressors. It makes a high pitch sound then stops. I threw the gauges on it and found that pressure is going up and dropping continuously.

    At the time outside ambient temp was 103 degrees.

    Suction side - 85 to 100 then dropped back down.
    Liquidbside - 325 to 350/370 then dropped back down.

    As of yesterday I didn't have a chance to check the pressures but The expansion valve is still making the same noise and I seen that one has been changed in the past.

  2. #15
    Join Date
    Jul 2007
    Location
    The Hot South
    Posts
    1,313
    It's not necessary to buy an expensive fancy inline flow meter. Check the pressure drop across the chiller barrel (with same guage and inside any valves), then look at chart that's in installation instructions and you'll find your flow. The chart shows feet of water as pressure so you'll have to divide feet of water by 2.31 to convert it to PSI.

    Post a complete and accurate log.

  3. #16
    Quote Originally Posted by Screwit View Post
    It has been a while since working on recip chiller product but I beleive the load limit feature of the Honeywell Controller will prevent loading until LWT falls below 55F (13c), on increasing water temperature load limit operation is initiated at 64F (18c).
    It's been a while but i believe you hit the number's on the head.

  4. #17
    Join Date
    Aug 2006
    Location
    Mixing oil and fire with a big spoon.
    Posts
    4,348
    Quote Originally Posted by graham View Post
    I got a 2500 ton Duplex for you to check the flow on with your 55 gal barrel and Im gonna sell tickets to the show !!!!!!!!
    do you take credit cards? i will buy 2...1 for my butt and 1 for my jaw when the line gets opened!
    "Mother" is the name for God on the lips and hearts of children....The Crow

  5. #18
    Join Date
    Mar 2004
    Location
    ottawa canada
    Posts
    2,045
    Quote Originally Posted by jayguy View Post
    do you take credit cards? i will buy 2...1 for my butt and 1 for my jaw when the line gets opened!
    Credit cards , paypal, wired drafts , cheques , money orders . I take em all !!!!!
    Im gonna make a whole lotta dough on this water show ???????

    Yee haa a 1000 posts ....do I get a free upgrade or a prize now ?????
    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 .

  6. #19
    Join Date
    Jan 2005
    Location
    Houston TX
    Posts
    874

    Honeywell (Trane) W-7900

    Dharvey00- The W-7900 has three dials in the middle, 1) leaving water set point, 2) design delta T( difference between entering and leaving water) and 3) the total # of stages. Do not attempt to adjust the lower 2 with the machine in operation. You stated that your Machine model # is a CGACD1554, that unit should have 2 -75 ton model E compressors, just for $hit$ and grins check to see the placement of the 2-3 and 5-6 contacts on the right side of the controller. These should be on the normally open contacts as the unloaders on a model E compressor have to be energized to load. This is just the opposite of a model R which have to be de-energized to load. What Screwit is right on the money, the controller will not allow the compressor to fully load up until the leaving water drops to 56*F and then it will force it to unload back down if the temperature rises back above 64*F. This prevent the compressor from being overloaded while still operating out of range. If LED,s 1 and 2, 4 and 5 are on and your leaving water is above 56*F, you are load limited. As far as the flow rates per Trane's manual you have a minimum flow of 180 GPM and a maximum flow rate of 525 GPM. So if your delta "P" is above 36'- 15.5 #'s you are moving way too much water through the barrel. Rough computation, try single gauge method on inlet and outlet of the evaporator and set it for about 20' delta "P" or about 8.75 #'s that should give you about 360 gpm. These figure's are based on the Trane CGACD with an "M" sized evaporator barrel from the start-up manuals Note to graham; if I buy tickets can I have them located in the upper deck, my kids and I don't like getting our feet wet at comedy shows.-Geo
    Once in a while everything falls into place and I am able to move forward, most of the time it just falls all over the place and I can't go anywhere-GEO

  7. #20
    Join Date
    Aug 2011
    Location
    San Jose California
    Posts
    166
    Ok. I did not look at the tonnage as I should have re flow rates. I have egg on my face. I was trying to think outside the box to get flow. I was wrong. Open mouth insert foot
    Our fate is ours alone to decide as long as we remain armed heavily enough to dictate it.

  8. #21
    Join Date
    Mar 2004
    Location
    ottawa canada
    Posts
    2,045

    Thumbs up

    Quote Originally Posted by freonr22 View Post
    Ok. I did not look at the tonnage as I should have re flow rates. I have egg on my face. I was trying to think outside the box to get flow. I was wrong. Open mouth insert foot
    So does this mean the water show is cancelled ????? I have bleachers booked , hot dog & popcorn vendors on stand by divers ready for emergencys and emergency first aiders etc and I had to pay the guy whos going to open the valve in advance ??????
    Yeeee haaaa the weekend !!!!!!!!!!!
    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 .

  9. #22
    Join Date
    Aug 2006
    Location
    Mixing oil and fire with a big spoon.
    Posts
    4,348
    Quote Originally Posted by graham View Post
    So does this mean the water show is cancelled ?????...
    i will be waiting for my refund in the mail.
    "Mother" is the name for God on the lips and hearts of children....The Crow

  10. #23
    Join Date
    Mar 2004
    Location
    ottawa canada
    Posts
    2,045
    Quote Originally Posted by jayguy View Post
    i will be waiting for my refund in the mail.
    Cheque is in the mail ........if you believe that you'll believe anything
    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 .

  11. #24
    Join Date
    Jul 2010
    Posts
    17
    Never mind. Cany upload images from the iPad.

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