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  1. Replies
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    OK, in this case the frost on the returns was the...

    OK, in this case the frost on the returns was the symptom and the leaking door seals were the source of the moisture infiltration.
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    It's good you add "snow" to the list, because...

    It's good you add "snow" to the list, because it's different than hard old ice or new frost. Snow is fluffy frost, often called hoar frost, which is what forms in the fall and spring on clear...
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    Here's a simple belt sizing program that could be...

    Here's a simple belt sizing program that could be made into an app:

    Belt Sizing Calculator

    710291
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    There are a lot of us here who would benefit from...

    There are a lot of us here who would benefit from an app to estimate the required condenser flooding charge based on the procedure outlined in Sporlan Bulletin 90-30-1:
    ...
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    I suppose it is rather like lipstick on a pig,...

    I suppose it is rather like lipstick on a pig, no? ;)

    For a much better, truly electronic timeclock try the Paragon 9145-00. You can configure them to replace any existing timeclock. I used...
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    Never seen that before. Here's a link to the...

    Never seen that before. Here's a link to the Intermatic webpage:

    http://www.intermatic.com/en/icube
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    The key is to learn how to "read the ice". ...

    The key is to learn how to "read the ice".

    Frost is new.

    Clear, hard ice is old.

    Buildups of frost or ice are caused by incomplete defrosts.

    Incomplete defrosting of frost creates...
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    I believe it's equivalent to the D/B-metic...

    I believe it's equivalent to the D/B-metic 15H/CF/LF, which means it's rated as a 1½ HP high temp R12, commercial and low temp R22/R502.
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    Acid-Away is another additive that has been...

    Acid-Away is another additive that has been popular with quite a few folks.

    A friend told me a few years back that True's tech support wanted an acid check on all in-warranty burnouts and to use...
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    I'm with you on the refrigerant and oil only. ...

    I'm with you on the refrigerant and oil only. I've never used ThawZone but apparently many have since it's still made after 30 years or so.
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    That's mainly Ethanol, just like ThawZone which...

    That's mainly Ethanol, just like ThawZone which has been around for decades.

    http://www.highsidechem.com/highside_sds/THAWZONE_sds.pdf
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    I've never seen anything like it...even in the...

    I've never seen anything like it...even in the zoo. ;)

    http://markair.com.au/product/fans-backward-curve-ebm-papst-external-rotor-ebm-papst-190mm-240v-2-pole-backward-curve-fan/
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    The RST55C1E comes on the Copeland M4FF-0075...

    The RST55C1E comes on the Copeland M4FF-0075 condensing unit, which is a R404A commercial temp unit rated at a nominal 3/4 hp.
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    Where did you come up with 60,000 Btuh? The...

    Where did you come up with 60,000 Btuh?

    The unit is a nominal 6 HP with a ZF18 scroll and will do about 2 tons at -20°F SST.
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    OK, now we have your real question...ie, you need...

    OK, now we have your real question...ie, you need to know if the new one has the same capacity as the old one.

    What is the model of the old compressor? Look up the Btuh of both at the same...
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    Re: The transformer zip-tied to the TXV...

    Why would anyone opt to locate a transformer in an evap coil at the end opposite the electricals? :rolleyes:
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    Why? Horsepower is irrelevant.

    Why?

    Horsepower is irrelevant.
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    Study this Sporlan Bulletin 90-9 "TEV...

    Study this Sporlan Bulletin 90-9 "TEV Identification":

    http://sporlanonline.com/literature/10/210-60.pdf
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    Perhaps they could only find a TXV for a 230V...

    Perhaps they could only find a TXV for a 230V unit. ;)




    The ZP pressure limiting valve will throttle to hold the evap pressure to around 35 psig (0°F) or so when the box temp is high due to...
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    For a 32°F box you'll be running up around 15°F...

    For a 32°F box you'll be running up around 15°F SST if you consider how the compressor would gain a bunch of BTU's at the higher suction, but it will gain a lot of amps too.

    Those ZF scrolls have...
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    ĦBuenisimo! :cheers:

    ĦBuenisimo! :cheers:
  22. Replies
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    It's a nice little formula derived from...

    It's a nice little formula derived from Bernouli's Principle. It's easy for us mere mortal mechanical drudges to work with because there's no higher math than square root, but every tech should be...
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    To sum it up, flow's all about P1 - P2, not P1 /...

    To sum it up, flow's all about P1 - P2, not P1 / P2.

    All the rest is gingerbread and decorations.
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    Yes, orifice mass flow is directly proportional...

    Yes, orifice mass flow is directly proportional to the square root of the pressure drop as can be seen in this equation for incompressible fluid flow through an orifice:


    707641
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    I wouldn't be too worried about any low discharge...

    I wouldn't be too worried about any low discharge pressure related capacity issues with the TXV.

    The nominal pressure across the valve for R134A at a 40°F evap temp is 60 psi according to...
  26. A banging sound on start and stop can be as...

    A banging sound on start and stop can be as simple as failed compressor mounting isolators.
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    I just changed mine. Logged out, logged back in...

    I just changed mine. Logged out, logged back in with the new password and it worked.

    Yes, this could have been handled better...but that's nothing new. ;)
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    The next time I go up the hill here in Ecuador...

    The next time I go up the hill here in Ecuador I'll be going from sea level to 8200 ft.

    I should take my shorty compound gauge with me. ;)
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    Then you may be at sea level, but in the middle...

    Then you may be at sea level, but in the middle of a strong hurricane. :eek:
  30. In a closed system, the refrigerant doesn't know...

    In a closed system, the refrigerant doesn't know or care about what we call vacuum, because vacuum is still a measure relative to atmospheric pressure just like gauge pressure. The gas in the system...
  31. It may help to think of it this way...nothing...

    It may help to think of it this way...nothing mystical happens when you cross over from psig to inches Hg.

    Try to imagine a simple LT system as the evap temp and pressure gets lower and lower....
  32. Replies
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    I had it screwed up too... PSIG = PSIA + 14.7 ...

    I had it screwed up too...

    PSIG = PSIA + 14.7 :whistle:
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    You have that a little confused... PSIG = PSIG...

    You have that a little confused...

    PSIG = PSIG + 14.7

    CR = (Disch PSIG +14.7) / (Suction PSIG +14.7)

    CR (A/C) ~ 3-4:1

    CR (Refrig) ~ 10:1 (for low temp)
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    You have two options to choose...the maximum...

    You have two options to choose...the maximum length of defrost and the duration between defrosts. If you set the interval to zero, logic dictates that you should get a constant defrost period and no...
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    Don't let the strange arrangement or the size of...

    Don't let the strange arrangement or the size of the system overwhelm you. It's still just refrigeration. Take one aspect at a time...like start with one cooler TXV and answer questions like these:...
  36. Thread: Now what ?

    by icemeister
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    You'll get a call back when they find their...

    You'll get a call back when they find their tightly packed cases of formerly frozen food has thawed out.

    Customers, even those who have been in the food service industry for many years, have a...
  37. Thread: New install

    by icemeister
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    My "learnings" concerning traps have been: ...

    My "learnings" concerning traps have been:



    A trap at the base of all risers over 4 ft
    An inverted trap at the top of every riser over 10 ft
    An intermediate trap at the midpoint of every...
  38. Thread: New install

    by icemeister
    Replies
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    1,234

    When I first started out in the business back in...

    When I first started out in the business back in the early 1970's we followed the piping guidelines in Hussmann's Engineering manuals of the day. At that time traps were specifically required on all...
  39. Thread: New install

    by icemeister
    Replies
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    The P-trap at the coil outlet is recommended to...

    The P-trap at the coil outlet is recommended to promote oil drainage away from the coil such that it doesn't interfere with the TXV sensing bulb function. It's shown on jyst about every installation...
  40. ...and now for the rest of the story. This...

    ...and now for the rest of the story.

    This unit was under warranty and from what I had observed, my gut feeling was the internal check valve wasn't sealing fully. This would have indicated the...
  41. OK, that applies to ZR and ZP scrolls which are...

    OK, that applies to ZR and ZP scrolls which are A/C and HT.

    I believe the pressure differential protection that this page refers to is intended to allow compressors installed by OEM's without LP...
  42. Not by any mechanism I'm aware of. These...

    Not by any mechanism I'm aware of. These compressors will pump into a vacuum.

    The burp I mention is normal for a scroll. The discharge check valve stops the high pressure gas downstream from...
  43. I've seen it numerous times with Heatcraft...

    I've seen it numerous times with Heatcraft scrolls with the encapsulated low pressure control. When the compressor suction drops to the CO of the switch the compressor will stop but the suction...
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    Sounds like a partially lugged cap tube alright. ...

    Sounds like a partially lugged cap tube alright.

    This is a good candidate for a TXV. Does the suction line from the top coil come back down through the bottom so you can attach the TXV bulb?
  45. Ms Icemeister and I still laugh about the huge NH...

    Ms Icemeister and I still laugh about the huge NH state liquor store they built on I-95 just a few miles north of the Massachusetts border. It even had its own exit.

    NH state troopers used to...
  46. The NH road use fee is intended to replace the...

    The NH road use fee is intended to replace the current gas tax, not add to it.

    Their gas tax of 22˘/gal would be dropped...meaning...the cost per gallon of your gas would be 22˘ less.

    The...
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    The Hoshizaki evaporators are much cheaper...

    The Hoshizaki evaporators are much cheaper because there's really not that much to them but some copper tubing and some thin stainless sheet metal. It's much more economically feasible to replace...
  48. As I understand the proposal in NH, they aren't...

    As I understand the proposal in NH, they aren't intending the road usage fee to be in addition to the existing fuel tax, rather to replace it with a more directly related to actual road use.

    The...
  49. New Hampshire's proposed "road usage" fee is...

    New Hampshire's proposed "road usage" fee is based on vehicle's miles driven per year and its age as well as its rated fuel efficiency. The fees would be collected yearly at vehicle registration...
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    Checking the tightness of the return bends was...

    Checking the tightness of the return bends was one of the first things I checked on a Hoshi that was slow or repeatedly freezing up.

    It's classic Hoshizaki tube separation, and once it's begun it...
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