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  1. Thread: Ground short ?

    by rupert
    Replies
    52
    Views
    3,190

    Was the unit main isolator open or was the unit...

    Was the unit main isolator open or was the unit switched off on the control on of switch when you pulled the vacuum.
  2. Thread: Walk in help

    by rupert
    Replies
    11
    Views
    1,292

    Walk in help

    I would check with the manufacture to find out if this evap coil needs a external or internally equalised txv if it needs a distributer it will also need a externally equalised valve, or you could...
  3. Thread: 5678

    by rupert
    Replies
    1
    Views
    484

    12345

    12345
  4. Thread: Need Info

    by rupert
    Replies
    1
    Views
    663

    Can anyone help ,need wireing diagram and...

    Can anyone help ,need wireing diagram and sequence of operation for a AAONAIRE unit M# RK-20-2E1-1D2 S# AKENO2996 . two stage cooling with eonomiser, heat recovery wheel and power exhaust. thanks.
  5. Replies
    7
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    1,084

    kitchen exhaust hood.

    licensed to chill, the Icc international mechanical code 2003 edition, page 43. 507.13 through 507.13.4 it is all there.
  6. Replies
    26
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    2,031

    bearing problem

    this one sounds like a killer, any possibility that you can fit a machined sleeve over the damaged part of the shaft lock in position, and use oversized bearings. good luck.
  7. Thread: ddc control

    by rupert
    Replies
    4
    Views
    959

    ddc control

    thanks for the replies i will check out the web site that you suggested.
  8. Thread: ddc control

    by rupert
    Replies
    4
    Views
    959

    regarding ddc control,what does analog mean, why...

    regarding ddc control,what does analog mean, why is it sometimes used instead of digital control.

    what does digital mean, why is it sometimes used instead of analog, what would be the advantage of...
  9. Replies
    20
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    2,032

    Noticed that the TXV had no equalising line, I...

    Noticed that the TXV had no equalising line, I would expect the pressure drop through that coil to be enough to cause the valve to throttle down to much and starve the coil.
    haveing said that i...
  10. Replies
    4
    Views
    704

    Thanks for the replies, got in touch with...

    Thanks for the replies, got in touch with tecumseh tech line
    they verified that the manifold did not have schreaders fitted, and that a pinch off tool could be used or remove the charge.
    thanks.
  11. Replies
    4
    Views
    704

    This is a Tecumseh M# AVA2512ZXNXM. S# OA4047111....

    This is a Tecumseh M# AVA2512ZXNXM. S# OA4047111. low temp condensing unit on 404A. I need to change out the H.P and fan control pressure switches. Question does anyone out there know if the...
  12. Replies
    17
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    14,614

    quantity of chilled water required

    the trane website engineers newsletter archive has some very interesting articles on variable flow rates in chilled water systems.
  13. Replies
    17
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    14,614

    quantity of chilled water

    3 galls per min per ton would be enough due to a makeup water supply keeping the volume of water constant in the cooling tower sump, as it is being evaporated in cooling the condenser water.
  14. Replies
    17
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    14,614

    quantity of chilled water required

    one method you can use assuming a 10 degree temp drop through the chiller is 2.4gallons per min per ton of cooling and 3.0 gallons per min per ton through your condenser if it is water cooled.
  15. Replies
    14
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    1,655

    bashing compressors

    i agree with with what has been said regarding liquid flood back etc,a few years back i saw a similar problem on a rack system,3xcompressors common discharge line piped into one side of the discharge...
  16. Thread: defrost timer

    by rupert
    Replies
    25
    Views
    6,185

    defrost timer

    sparky one thing i would be concerned about re disconnecting x terminal solinoid,if timer motor goes bad during defrost you could end up with one hot evap coil.
  17. Replies
    7
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    1,095

    major 409a disaster

    doe's this system have any capacity control,are the individual boxes controled on a pump down cycle.and compressor cycling on lp switch.
    as suggested running the system wide open and checking...
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