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  1. Replies
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    I have seen three identical Alco Headmasters...

    I have seen three identical Alco Headmasters piped in parallel from the factory. It was done strictly due to cost.
  2. Replies
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    624

    I had a few condensers on pizza preps where the...

    I had a few condensers on pizza preps where the flour had gotten wet and the heat baked it hard and crusty. I found that a hacksaw blade could be worked in between the fins to break it up so it...
  3. Thread: subcooling

    by icemeister
    Replies
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    669

    I think your confusion is due to the statement...

    I think your confusion is due to the statement made at the Copeland seminar was likely referring to the increase in the "system's capacity" due to increased subcooling, whereas you're looking at it...
  4. I believe most all of the Coldtech/Ascend doors...

    I believe most all of the Coldtech/Ascend doors used a cartridge type spring return hinge like the Kason 1556-4:

    http://www.kasonind.com/files/9612/5907/6552/1556-2pg_order.1.pdf
  5. Replies
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    494

    Hill/Phoenix used to provide you with a system...

    Hill/Phoenix used to provide you with a system legend sheet with all the refrigerant piping sized for you.

    They don't have a good system installation manual, so here's some info from Hussmann:
    ...
  6. The TXV and superheat don't really come into play...

    The TXV and superheat don't really come into play in the evaporator TD. As BBeerme said, TD is set in the equipment selection process by matching or balancing the condensing unit capacity with the...
  7. Typically, only door cases (and walk-ins) stop...

    Typically, only door cases (and walk-ins) stop the fans during defrost...whether it's hot gas or electric. Open cases like multi-deck and coffin cases will leave the fans on and terminate at around...
  8. I also had that feeling at one time about the...

    I also had that feeling at one time about the smaller ID tubes, but now I realize that if conditions exist within the system to cause a cap tube to plug up, a larger bore size will only delay the...
  9. If you are going with R134A, yes you will need to...

    If you are going with R134A, yes you will need to change the capillary tube, but it needs to be longer (for the same ID) than the R12 tube. I have used Tecumseh's cap tube selection program numerous...
  10. You're right. It should be YXA for R134A. ...

    You're right. It should be YXA for R134A.

    (I just wanted to see if you were paying attention. :angel: )
  11. From the B/M number posted, the replacement model...

    From the B/M number posted, the replacement model number should be Tecumseh AEA3440AXA if it didn't have a start capacitor or AEA4440AXA if it did. Both of these come with alkylbenzene AB oil which...
  12. Replies
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    796

    I always found it interesting that neither the...

    I always found it interesting that neither the two major suppliers of replacement capillary tubes, Supco and JB Industries, discuss how the suction/liquid heat exchange length affects the cap tube's...
  13. Replies
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    717

    itsiceman explained it well. The grapefruit...

    itsiceman explained it well. The grapefruit juice thing was mentioned here on HVAC-Talk quite some years ago. I tried it and it really helped. I don't recall any particular dilution rate. I was...
  14. Replies
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    1,417

    Glenn Hennigan, the "old fart", probably wrote...

    Glenn Hennigan, the "old fart", probably wrote those bulletins.
  15. Replies
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    1,228

    With the quality of the copper these days, I...

    With the quality of the copper these days, I don't think it matters whether you use soft in 50 ft rolls or 20 ft lengths of ACR hard drawn tubing. Just keep it as dry as possible so as to avoid...
  16. Thanks for the pics! That HGBP setup is a clean,...

    Thanks for the pics! That HGBP setup is a clean, almost factory looking job.

    The ORIT is what I expected at the top end. It would be good to get an idea of what they did down below. I'm still...
  17. Replies
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    717

    I've used grapefruit juice on new machines. It...

    I've used grapefruit juice on new machines. It helps promote a more even flow over the new evaps. It's not a strong enough acid for cleaning though.
  18. If the ORIT is intended to regulate the...

    If the ORIT is intended to regulate the evaporator pressure of one or more of the circuits, those circuits would need to be a higher temp than the main coolers, not low temp.
  19. It's very possible this second suction line is...

    It's very possible this second suction line is actually part of a rather clever double riser setup.

    Since this system can unload to virtually zero load, a double riser is needed and can be...
  20. What is this second suction line with the ORIT...

    What is this second suction line with the ORIT connected to? It's not clear to me what it's for, but somebody must have had a good reason to go to a lot of trouble to install it.
  21. The BZT025M6 has a receiver capacity of 14 lbs at...

    The BZT025M6 has a receiver capacity of 14 lbs at 90% full. If it was installed in 2006, then it must have the old copper tube/aluminum fin type condenser, so that would give you a couple of pounds...
  22. Replies
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    696

    In my experience, I found one brand's stiffness...

    In my experience, I found one brand's stiffness when cold might be more (or less) pronounced than another.

    Armaflex brand insulation seemed to me to remain more flexible and workable when cold...
  23. If the caulk is on the inside and not on the...

    If the caulk is on the inside and not on the outside, then moisture will condense in panel and the caulk is trapping the water...except where it's leaking out. A total outside vapor barrier is your...
  24. Here are some ideas. I've used the ones with...

    Here are some ideas. I've used the ones with vinegar and coffee with some success:

    http://www.wikihow.com/Get-Bad-Smells-out-of-a-Microwave
  25. Are all of the panel joints for this box caulked?...

    Are all of the panel joints for this box caulked? Are they caulked on the outside or on the inside?

    I say this because most prefab cooler panels are designed with sealing strips which seal the...
  26. Replies
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    603

    I don't recall ever seeing Manitowoc remote with...

    I don't recall ever seeing Manitowoc remote with a fan cycle control.
  27. Replies
    27
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    1,417

    What is the "Copeland Air Conditioning Training...

    What is the "Copeland Air Conditioning Training Manual"? I'm not familiar with that one. Got a link?

    What exactly is it stating differently?
  28. Replies
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    1,417

    The student should take this as a learning...

    The student should take this as a learning experience. He will learn that he is being tested not on facts, but what he was to study in the assigned text.
  29. Replies
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    1,417

    Copeland has Application Engineering guidelines...

    Copeland has Application Engineering guidelines for when crankcase heaters are required. One such condition is when the total system refrigerant charge doesn't exceed the stated amount for a...
  30. Replies
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    1,417

    Here's an old Copeland video about flooded...

    Here's an old Copeland video about flooded starts:



    https://www.youtube.com/watch?v=lpluyTCeSRQ
  31. Replies
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    2,009

    :ditto: Pop the head and check the valves. ...

    :ditto:

    Pop the head and check the valves. Chances are good you can get it back to work with a valve plate kit:

    Copeland P/N 998-0661-16
  32. Replies
    9
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    1,753

    Many of my customers in Florida were on well...

    Many of my customers in Florida were on well water systems with some of the highest mineral contents in the country...not to mention the hydrogen sulfide. In spite of what many ice machine...
  33. Replies
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    2,009

    This is from the True Tech Service Manual (2002):...

    This is from the True Tech Service Manual (2002):

    533441

    They say 15F. I was close. ;)
  34. Replies
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    2,009

    If a past service has already included charging...

    If a past service has already included charging (or even just topping off) with R404A you may well have a plugged cap tube and/or filter-drier and not a leak. Many techs will do an unsuccessful leak...
  35. Replies
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    Tecumseh makes some little compressors: ...

    Tecumseh makes some little compressors: http://www.masterflux.com/userimages/Brochure/MX_Catalog.pdf
  36. Replies
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    I will agree with Jettinvr6sc. I worked for D/B...

    I will agree with Jettinvr6sc. I worked for D/B starting in 1977 in commercial refrigeration sales. I saw a few of those in my travels, but they had been discontinued long before that...probably...
  37. Replies
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    2,358

    I've had one of those for many years. In a...

    I've had one of those for many years.



    In a pinch I've used refrigerant. I found it seems to permeate through the rubber fairly rapidly, but it'll get you home. ;)
  38. Replies
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    2,358

    This is an article from a pro-nitrogen tire...

    This is an article from a pro-nitrogen tire group, but it appears to be factual info:
    ...
  39. Replies
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    1,201

    I have long been suspicious of the "OEM" cap...

    I have long been suspicious of the "OEM" cap tubes that are always exactly 10 ft in length. That is simply too much of a coincidence.

    I have used the Tecumseh cap tube selection program with...
  40. Replies
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    1,347

    Arriving at an accurate and yet realistic load...

    Arriving at an accurate and yet realistic load estimate may be two different things. BeerMe's earlier response about the low load figure looks too low and how they'll never hold temps as soon as the...
  41. Replies
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    1,347

    I would take a serious look at adding a larger...

    I would take a serious look at adding a larger receiver, a suction accumulator and a hot gas bypass valve with desuperheating expansion valve (at the condensing unit). If the condensing unit is...
  42. Replies
    103
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    3,550

    Capillary action or wicking is a result of the...

    Capillary action or wicking is a result of the effects of surface tension and adhesion of a liquid, typically in a very small diameter tube. I don't see how this could possibly apply to a...
  43. Replies
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    3,550

    When you state "venting a stream of relieved high...

    When you state "venting a stream of relieved high pressure gas", I then assume it's a refrigeration system which is being vented and the gas is dry, as it would normally be in operation. I also...
  44. Replies
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    752

    Something like these mini-CB's with the "D" trip...

    Something like these mini-CB's with the "D" trip rating might work:

    http://www.automationdirect.com/static/specs/wmztminicircuitbreakers.pdf
  45. Replies
    13
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    752

    I've only seen this on a job I was on some 30...

    I've only seen this on a job I was on some 30 years ago when I worked for Dunham-Bush. I don't recall what the fix was unfortunately. I suggest you call the transformer manufacturer as they will...
  46. Replies
    13
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    752

    It sounds like the fuses are popping due to the...

    It sounds like the fuses are popping due to the inrush current during power-up of the transformer. This can happen even with no load on the secondary windings. Are they slow-blow fuses?
  47. Replies
    5
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    444

    Copeland used to have the voltage correction...

    Copeland used to have the voltage correction noted on their printed performance curves...back in the day when they were real plotted curves. I recall seeing it more recently, but I forget where that...
  48. Replies
    5
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    444

    The amp draw is inversely proportional to the...

    The amp draw is inversely proportional to the supply voltage, so it's

    (Rated Volts) / (Actual Volts) x Rated Amps = Actual Amps

    For 208V, the proportion would be 230/208 or x 1.105 or about...
  49. Replies
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    564

    I believe Aspera has been absorbed by Embraco to...

    I believe Aspera has been absorbed by Embraco to the point where they don't even acknowledge the Aspera name any more. Also, Copeland has rather close ties to the old Aspera line as their A-Series...
  50. I usually inserted the sensing tube into the...

    I usually inserted the sensing tube into the center of the coil (from the back side where possible). I never found the location on the coil made much of a difference, as it was more important to get...
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