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  1. Replies
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    Allen A

    compressors are

    Hitachi SSCA075AR/COE10735

    fatboy
  2. Replies
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    1,800

    Allen A

    The upgrade is 3-4 weeks away from D/B

    School starts in 3 weeks, teachers in bldng in 1 1/2 weeks , chiller does entire 800 student school

    D/B says retrofit will take 30-40 hours

    GB at D/B...
  3. Replies
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    1,800

    Dunham Bush NC25-4 upgrade to Director

    Anyone performed the Dunham Bush NC25-4 controller (obsolete- originally made by Danfoss) upgrade to the Dunham Dush Director controller.

    I have one on order thru DB, curious on ease of conversion...
  4. Replies
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    could your low limit setpoint be holding the...

    could your low limit setpoint be holding the damper signal closed

    fatboy
  5. Replies
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    3,535

    try http://www.krueger-hvac.com I was on...

    try http://www.krueger-hvac.com

    I was on their site recently inquiring on a vav box

    they had info on pneaumatic,analog and ddc setup of their box's

    fatboy
  6. Replies
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    995

    Sonc not doing much JC work anymore, but I run...

    Sonc

    not doing much JC work anymore, but I run a dual boot operating system on my laptop and I have accessed JC controllers thru both Oper Sys's ( XP Pro and 2000)

    my laptop has a serial port
    ...
  7. Thread: megging

    by fatboy
    Replies
    29
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    4,126

    also never perform a megohm test on a...

    also

    never perform a megohm test on a compressor motor that is in a vacuum

    fatboy
  8. Replies
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    977

    cost if set up properly, your P66 will come on...

    cost

    if set up properly, your P66 will come on first, then as press rises, your fan cycle controls will stage the remainder of fans and possibly back off or nearly stop your P66 fan

    I don't...
  9. Replies
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    4,609

    pringlel I was under the schooling that press...

    pringlel

    I was under the schooling that press independant vav box's
    use the hi/lo pickup tubes, not press dependant

    a press independant box measures the delta P across the p/u tubes and then...
  10. Replies
    38
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    2,374

    hvacrus2 you whorersalesers at Carrier already...

    hvacrus2

    you whorersalesers at Carrier already rape us(contractors) for the cost of parts

    sorry about your luck,,

    when I call you factory guys, I expect answers

    in my area we are referred...
  11. Replies
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    when you call into tech support and play the...

    when you call into tech support

    and play the phone tag game to get to the answer man

    you better have the info available that they want

    like NormC said, show you know what your attempting to...
  12. Thread: Mcquay screw

    by fatboy
    Replies
    66
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    7,344

    HW Chiller Man sounds like I need to checkout...

    HW Chiller Man

    sounds like I need to checkout the Copeland screw line

    have you serviced much Hitachi screws?

    if so how do they compare to the Mcq or copeland?(got a few D/Bush chillers that...
  13. Thread: Mcquay screw

    by fatboy
    Replies
    66
    Views
    7,344

    HW Chiller Man thanks for the repost, sounds...

    HW Chiller Man

    thanks for the repost, sounds like you have this retrofit under control.

    the 10 sec on/off delay, is this to position the slide vlv for capacity?

    If I remember correct my 80t...
  14. Thread: Mcquay screw

    by fatboy
    Replies
    66
    Views
    7,344

    hw chiller man you got me curious on the...

    hw chiller man

    you got me curious on the Copeland screw replacement

    what tonnage is available on the Cope screw?

    how detailed of retrofit and will the Microtech boards control the...
  15. Replies
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    2,672

    why are you using 4 DX9100's, would not 1 do the...

    why are you using 4 DX9100's, would not 1 do the job
    (seems a lot of overkill to me to use 4)

    or would not JC unt controllers be less expensive

    fatboy
  16. Replies
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    633

    controltechnician so you have alot of exp with...

    controltechnician

    so you have alot of exp with the dca's

    my question on a possible gear problem on the now defunct/out of production 35in/lb 2 position 24v ML81851008 spring return produced...
  17. Replies
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    what quality of system do you want cheap- ...

    what quality of system do you want

    cheap- seperate cooling only rtu with ductwork

    moderate- mini splits but at 20x20 you could need 10+ tons/3 units

    quality- ATStulz or Liebert self...
  18. Replies
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    633

    anyone having bad experiences with the ML series...

    anyone having bad experiences with the ML series direct coupled actuator?

    Hnywl now has the MS series to replace the ML series that was marketed in the 2000- late 2002

    got a few jobs that the...
  19. Replies
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    1,255

    When I megohm compressors on pm or service work,...

    When I megohm compressors on pm or service work, I use the data to establish a trend and then compare these readings from pm to pm to see if the megohm value is consistent or dropping.

    other...
  20. Replies
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    service guy I guess i read the other posts and...

    service guy

    I guess i read the other posts and thought this unit was a 100%oa setup as Maxster mentioned in his post, when I reread Geo1950 's original post he does not mention 100%oaair, anyways...
  21. Replies
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    7,028

    your electric unloaders are most likely...

    your electric unloaders are most likely controlled by a discharge air controller to maintain a desired supply air temp

    I would set the hot gas bypass regulator to a suction press/temp to prevent...
  22. Thread: vfd controller

    by fatboy
    Replies
    10
    Views
    1,518

    hvac3901 are not Alen Bradley and ABB to...

    hvac3901
    are not Alen Bradley and ABB to seperate manufacturers of vfd's?

    Fatboy
  23. Replies
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    tonymjr you are going to have some press drop...

    tonymjr

    you are going to have some press drop difference between disch serv valve and the liq line- I see it all the time on larger tonnage units

    the only true press drop reading across the...
  24. Replies
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    USMC like the others stated, more info on the...

    USMC

    like the others stated, more info on the setup would be desirable

    had a new install of a vav system where the suit/tie engineer figured a reheat indeco box on the med press air duct- only...
  25. Thread: piping question

    by fatboy
    Replies
    11
    Views
    1,781

    I agree with BobbyM cond was misordered. ...

    I agree with BobbyM

    cond was misordered.

    most OEM's don't offer a 40+tonnage unit in a single circuit anymore, I believe Mcq and AAON do, all others are custom made

    You may have to remove...
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