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  1. Replies
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    Why is this so That the expansion valve is will...

    Why is this so
    That the expansion valve is will be oversized - the typical operating pressures are quite similar
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    This is spot on- indeed I did have to adjust the...

    This is spot on- indeed I did have to adjust the TXV after as superheat was way too low at start up with a warm box.
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    Year old thread I guess but just my two cents...

    Year old thread I guess but just my two cents AVOID Astea - sounds like another form of the same type of thing. It sucks and even the admin side of things hate it- so one thing field techs and admin...
  4. So after some considerations I modified the...

    So after some considerations I modified the control system a little. Set it up to cycle on Tstat and mounted bulb up into top shelf. Bulb cap tube fit into crevice nicely so no concerns over damage...
  5. Not sure exact comp capacity but if the LPC as...

    Not sure exact comp capacity but if the LPC as after the the CPR how are we accurately cycling according to evap pressures it the sensed pressure is reduced? Makes no sense to me. So done lazily...
  6. Thread: r12 to 134a

    by dave1234
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    Oh absolutely POE " scrubs the walls" But I've...

    Oh absolutely POE " scrubs the walls" But I've been confused where such goo - parafin wax- comes from in a system that's never been services prior and come from factory with AB oil- thought the wax...
  7. Thread: r12 to 134a

    by dave1234
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    721

    Maybe it's just me but for whatever reason 409...

    Maybe it's just me but for whatever reason 409 seems to run hottest of all the 12 flavors. I can say for absolute certain that a small percentage of the 502 to 404 Retros I've done on smaller systems...
  8. LPC as operator AFTER CPR? And why on med temp

    open deli case having erratic behavior numerous callbacks and evap freeze ups- got my crack at it today- hmmm somebody installed the LPC - which is the operator no Tstat- after the CPR valve. Gee...
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    When dialing In superheat what kind of subcooling...

    When dialing In superheat what kind of subcooling value do you look for after the receiver -uh oh here we go again- seriously though just wondering as I tell a lot of the newer guys the absolute last...
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    Right. Operating pressures to low. I wrapped this...

    Right. Operating pressures to low. I wrapped this job up today and made the switch. $eem$ great. I recently converted the freezer in the same unit from HP80 to 404. Maybe it's just me but I just...
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    Because I'm just trying to sound smart. No...

    Because I'm just trying to sound smart. No seriously it's from what I've read here and revewing the enthalpy curve. I thought I've read it here. Yes am aware the cost of all these blends and I ask...
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    My thoughts exactly thanks for the reassurance

    My thoughts exactly thanks for the reassurance
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    Mp39 or 134a ??? To convert or not

    Have a leak- no idea what was in it but judging by the history I'm sure it was mp39, TXV says r12 so... Is med temp walk in air cooled pump down system with headmaster. Here's what makes my decision...
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    Why can't i view attachments on iPhone .

    Why can't i view attachments on iPhone .
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    620

    Cope LAHA 3ph overload confusion

    Having some trouble understanding something very basic- 3 ph LAHA comp has a power terminal block-then a seperate terminal block that go to the overload there if you remove the overload there is...
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    Interesting but I have a hard time seeing that...

    Interesting but I have a hard time seeing that for this application. I'm having the shop fab me something but well see how it goes- just in x with a plate and nut welded at the end well see how she...
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    Sounds like you guys have been there!! Are the...

    Sounds like you guys have been there!! Are the drag links fat enough to fill the slot without slipping out i realize there's different sizes would need something Blunt and large
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    Not bad but I put quite a bit of push on the...

    Not bad but I put quite a bit of push on the biggest screwdriver I could find it just slips out the slot on the part is so wide and not very deep. Obviously copeland doesn't want them replaced
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    Ok relief seems readily viewable by pulling the...

    Ok relief seems readily viewable by pulling the discharge valve- now how the hell does one get it out? Would it have killed them to put a hex head on it for a socket? Tried using a chisel as a...
  20. T.A.C/ Schnider Xenta 102-AX "night purge" mode

    Titled VAV controller (lon) mysteriously at random goes to "night purge" box mode (nvounitstatus) and overheats the space. I've never seen it do it but maintenance staff reports it. I've studied both...
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    Great responses guys thanks! What peaked my...

    Great responses guys thanks! What peaked my curiosity about the gasket is that the only parts exploded diagram i can find is from and Aussie outfit called renwhit and some of the parts diagrams have...
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    Where is refrigerant pressure relief on 6D

    Title says is all just wondering where the relief valve (NOT oil relief) is on 6d copeland. 6r parts explosion seems to point to behind the discharge service valve but also notes a pressure relief...
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    Actually i was just logging in to edit post and...

    Actually i was just logging in to edit post and ask that very question how does one verify the relief valve is not seated as thats actually what im leaning towards as the pressure didnt doesnt rise...
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    Odd cope 6D loading behavior

    Have a cope 35HP 6D remaan'd by Mcquay. During the off cycle short cycles incessivley. Front seated suction service valve and verified a head is blowing by- The strange thing is when i run the...
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    Yes I easily could've missed a seperate device...

    Yes I easily could've missed a seperate device that is a 24v signal amp. Lots of controllers on the wall. Is far as mislabeling that doesn't happen does it?
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    It does not power any of them like I said it is a...

    It does not power any of them like I said it is a regular transformer that says signal amplifier never seen that
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    24vac signal amp

    Ahu room had a plan 40va 24v xfrnr marked signal amplifier . Just wondering as to what's its purpose is although I imagine it gas to do with almost 30 actuators sharing a signal just looking for any...
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    That is true. So if where in 100% hgbp and our...

    That is true. So if where in 100% hgbp and our recips are suction gas cooled we can only hope it doesn't run overheated?funny I went from flooding to overheating compressors. Ice makes a convincing...
  29. Replies
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    Yes I'm sure there's no intention to alter the...

    Yes I'm sure there's no intention to alter the piping and it'll still be distrod directly after the TXV. The idea is more precise dat control only. The DHRE works just fine and serves its purpose-...
  30. Replies
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    I see this in precision cooling apps- CRACS. And...

    I see this in precision cooling apps- CRACS. And in my mind they're scrolls. Comfort cooling hardly demands such precise DAT. I realize the TXV will throttle back but if we're running hot gas were...
  31. Replies
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    But I like the old one... Ha

    But I like the old one... Ha
  32. Replies
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    Systems already have hot gas and have been in...

    Systems already have hot gas and have been in service for almost 20 years. Some consultant recommends this fancy new hgbp for more precise dat control during DX season. My fear is too much hot gas...
  33. Replies
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    A hot gas valve that will modulate based on DAT...

    A hot gas valve that will modulate based on DAT for more precise dat control won't to much hit gas flood evap
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    Yes two circuits 40 ton each one with hot gas

    Yes two circuits 40 ton each one with hot gas
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    Hot gas bypass and slugging

    As part of renovations a "mechanical enginerring consultant" recommends putting some sort of digital hot gas bypass to let the compressors run at next to nothing capacity. It is always fashionable to...
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    I totally agree that to open again for minor...

    I totally agree that to open again for minor repair and replace new dryer is pointless and waste of time. As far as the HH driers and 404 I was referring to retrofit scenerios and the fact that the...
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    That's another cause for discussion sporlan...

    That's another cause for discussion sporlan literature speaks of HH driers basically for removal of parafin wax as in lowtemp 404 retrofits but I hear guys talk about using them after a burnout...
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    If out of shear bored em I can see baking it. I...

    If out of shear bored em I can see baking it. I think I small purge while I rebuild a solenoid will keep it plenty dry- something that should be done anyways
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    Because I've read on this very site dudes- and...

    Because I've read on this very site dudes- and here's one I don't understand- baking an old dryer in the oven to save the $25 cost of a new dryer. That's one I don't get- I'm suggesting a more...
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    "Drying" a drier

    Long story short after replacing a drier the other day I realized I need to open the system for repair again briefly. Was thinking of placing a heat lamp above the dryer while it evacuates again to...
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    I could be dead wrong here but it's a data center...

    I could be dead wrong here but it's a data center and I believe it may be on ups already
  42. Replies
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    York chiller YLAA101 takes down BACNET

    Have a York YLAA101HE46X chiller. Everytime the facility does a load transfer gen test all devices go offline. Isolated problem to the chiller which uses BACNET gateway. Have to cycle control power...
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    My main point was regarding hairline cracks in...

    My main point was regarding hairline cracks in commercial equipment absolutley an atmospheric vented fan temp or time on would expose a co risk- on say a a continuos fan Rtu with induced draft if the...
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    [QUOTE=VTP99;17620201] 10-15lbs at least

    10-15lbs at least
  45. Replies
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    The line "worked well" was in reference to the...

    The line "worked well" was in reference to the retrofit procedure. I knew it was wrong hence spending my "off" time - as if there really was such a thing- dwelling on stuff. I was more less intrigued...
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    I regress I have heard of dual pressure...

    I regress I have heard of dual pressure headmasters- if I remember right U break off one of the bulb stubs
  47. Replies
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    So wouldn't just charging to clear site glass...

    So wouldn't just charging to clear site glass with cond coil wide open have an overcharge condition in the warmer weather
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    I've never heard of such a thing

    I've never heard of such a thing
  49. Replies
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    Wrong headmaster / overcharge?

    Retrofitted a system from 502 to 404. Worked well- noticed headmaster after the fact hidden behind receiver of course- to be an r12 flavor- yeah that not gonna work. Thinking of just returning with a...
  50. So simply put we can gage refrigerant capacity by...

    So simply put we can gage refrigerant capacity by the differance between when the low temp low pressure liquid and the boiling point - as once the gas is superheated its ability to absorb any more...
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