Search:

Type: Posts; User: icemeister

Page 1 of 20 1 2 3 4

Search: Search took 0.21 seconds.

  1. Thanks. That eliminates the dip tube question. ...

    Thanks. That eliminates the dip tube question.

    I'm leaning to the opinion that the retrofitting from R502 to R408A was a bad move for these particular systems. We don't have good performance data...
  2. Have you torched the receivers to verify the...

    Have you torched the receivers to verify the liquid levels? How much refrigerant is added when the amps shoot way up?

    Use the Copeland Mobile app or the performance data sheet I posted to do a...
  3. Please before getting too much more involved in...

    Please before getting too much more involved in this, get the superheat at the compressors. If you don't have frost/ice all the way to the compressor then it's too high. Then before you replace...
  4. The Copeland Mobile app shows only XL for...

    The Copeland Mobile app shows only XL for 230v-60Hz operation. The 220v-50Hz model is rated for low temperature.

    At 14 psig you're running right at the RLA. That plus what I suspect is a high...
  5. The Copelametic 9RS3-0765-TFC operating with R502...

    The Copelametic 9RS3-0765-TFC operating with R502 is rated as XL or extra low temperature. This means that the compressor will tend to overload at saturated suction temperatures (SST) much higher...
  6. Back in the early to mid 1990's, R502's price...

    Back in the early to mid 1990's, R502's price started to increase dramatically making the new interim replacement refrigerants for R502 like R408A a more cost effective choice for retrofitting. Even...
  7. Replies
    16
    Views
    400

    Thanks guys, but all it takes is taking what...

    Thanks guys, but all it takes is taking what little I know about eutectic holdover plates and adding a little info from Googling for info I don't know, like Cold Car. Never heard of them until now....
  8. Replies
    16
    Views
    400

    Cold Car uses eutectic holdover plates in their...

    Cold Car uses eutectic holdover plates in their system.

    https://www.coldcarusa.com/eutectic (There's a picture of them at the bottom of the page.)
  9. Replies
    7
    Views
    309

    Copeland's ZPV variable speed R410A scrolls have...

    Copeland's ZPV variable speed R410A scrolls have a brushless permanent magnet (BPM) motor and also have scrolls optimized for variable speed operation from 900-7000 RPM.
    ...
  10. Replies
    29
    Views
    11,998

    The link is broken, but I had a copy of the...

    The link is broken, but I had a copy of the Honeywell (Genetron) chart which includes various refrigerant densities:

    815928
  11. Replies
    6
    Views
    261

    The OP never specified what it is he's got other...

    The OP never specified what it is he's got other than saying there are two R410A indoor units, one R32 outdoor units and how or if they would work.

    Not knowing what we're looking at, I qualified...
  12. Replies
    20
    Views
    611

    Defrosting the evaporators at different times is...

    Defrosting the evaporators at different times is a likely contributor to the frost buildup problem.

    Typically, evaporators will defrost more effectively when there is minimal air movement, so if...
  13. Replies
    6
    Views
    261

    Without knowing the details of the units in...

    Without knowing the details of the units in question, any answer would be at best rather general.

    If the indoor units each have a thermostatic expansion valve (TXV) rated for R410A the...
  14. Before you get too deep into this, you should...

    Before you get too deep into this, you should determine if the existing condenser can handle the added load of the 10 hp scroll without adversely affecting the existing rack loads.
  15. In one way or another suction manifolds have...

    In one way or another suction manifolds have typically been constructed to function as an accumulator, each with some method of returning oil at a slow rate.

    I've never seen on done with an...
  16. Replies
    5
    Views
    246

    (+45) = Denmark All countries except for the...

    (+45) = Denmark

    All countries except for the US have a 3 digit Country Calling Code. The US is +1.

    Mine here in Ecuador is (+593).
  17. Replies
    5
    Views
    246

    This might be helpful: ...

    This might be helpful: https://www.ipu.dk/products/coolpack/
  18. Thread: Confus

    by icemeister
    Replies
    4
    Views
    391

    Refrigerated display cases for markets are...

    Refrigerated display cases for markets are designed as "endless" cases so they can be installed in a continuous lineup, usually consisting of 8 ft and 12 ft lengths. Glass door cases are typically...
  19. Replies
    12
    Views
    327

    No, if it were a single compressor/ single...

    No, if it were a single compressor/ single evaporator system. But I'm assuming it to be in a large central plant.
  20. Replies
    12
    Views
    327

    Is this evaporator at or near the end of the hot...

    Is this evaporator at or near the end of the hot gas line? Does the hot gas line have a means of draining condensate?

    I'm asking that because the hot gas can lose much (or all) of its latent heat...
  21. Replies
    12
    Views
    327

    Have you actually measured the evaporator...

    Have you actually measured the evaporator pressure to be 75-90 psig during a defrost?
  22. Replies
    27
    Views
    658

    The number scales on the front of the control are...

    The number scales on the front of the control are notoriously inaccurate, which is the reason why you need to use a set of refrigeration gauges to set it properly. But as I said in my earlier post,...
  23. Replies
    27
    Views
    658

    As pecmsg said, check to see if the control is...

    As pecmsg said, check to see if the control is actually sensing suction pressure. Sometimes you'll find that the LP control shares the suction service port on the compressor service valve which...
  24. I'm one of the few who actually like Ritchie...

    I'm one of the few who actually like Ritchie Yellow Jacket low loss hoses and adapters. I used them exclusively with 6 ft hoses and analog gauges for at least 25 years. I'll admit they require a lot...
  25. The standard 1/4" service hose holds...

    The standard 1/4" service hose holds approximately .30 oz/ft for liquid R410A, so a 5 ft hose would hold 1.65 oz of saturated liquid at 70F. R410A saturated vapor at 70 has a density that is about...
  26. Replies
    27
    Views
    658

    The temperature is controlled by the low pressure...

    The temperature is controlled by the low pressure control. Here's the Beverage Air DMC manual's section on controls:

    815457
  27. Replies
    12
    Views
    836

    FWIW...Thermotron SE Brochure:...

    FWIW...Thermotron SE Brochure:
    http://www.scs-se.com/wp-content/uploads/2017/11/SE-2014-HR.pdf
  28. Replies
    26
    Views
    1,506

    They're called frost-proof flare nuts: ...

    They're called frost-proof flare nuts: https://www.centurytool.net/Frost_Proof_Flare_Nuts_s/314551.htm

    I've seen at least a dozen cracked flare nuts and a lot more loose ones, all on TXV outlets...
  29. Replies
    26
    Views
    1,506

    First, regarding the video that was posted by the...

    First, regarding the video that was posted by the OP, I remember seeing that one a couple of years ago. My first reaction was that although he had the right idea for doing a two-temperature TXV...
  30. Replies
    14
    Views
    865

    I believe carryover could be more likely if the...

    I believe carryover could be more likely if the lower coil is offline. Condensate drainage from a coil has a lot to do with the air velocity and the fin spacing, but I've read there's an effect on...
  31. Replies
    14
    Views
    865

    Traditionally, coils that are split in face like...

    Traditionally, coils that are split in face like this are staged in sequence from the bottom up. The reasoning is if an upper section is on while a lower section is off, the condensate from the...
  32. Replies
    12
    Views
    585

    If a refrigerant retrofit from R22 is to be made,...

    If a refrigerant retrofit from R22 is to be made, R-448A appears to be the best choice...especially in light of the recent court ruling placing R-404A back on the chopping block.

    A big savings by...
  33. Yes it would, even with a static evaporator or...

    Yes it would, even with a static evaporator or cold wall such as would be found in a chest freezer.

    The problem is then to determine what would be the cause of this sudden drop in suction...
  34. Replies
    19
    Views
    914

    "Cold room" is a British English term for what is...

    "Cold room" is a British English term for what is a called a "walk-in cooler" in American English.

    The UK and the US are two countries separated by a common language. :cheers:
  35. Replies
    19
    Views
    914

    I believe Bob is looking for info on underfloor...

    I believe Bob is looking for info on underfloor heating for large freezers. As I recall he asked this question during our February hiatus here on HVAC-Talk, so that thread had evaporated.

    Here's...
  36. Here's what I found:

    Here's what I found:
  37. For any standard coil types you can get download...

    For any standard coil types you can get download a free coil selection program from just about any coil manufacturer. I have used Nationwide coils in the past for replacement coil with good results....
  38. Replies
    36
    Views
    1,407

    I think the key here is to do a detailed...

    I think the key here is to do a detailed calculation. Then show the engineer your numbers and say, "Where am I wrong?"
  39. Replies
    15
    Views
    827

    There are a couple of sound reason why Mexico...

    There are a couple of sound reason why Mexico doesn't appear to be hard hit with COVID-19.

    First, their first reported case didn't appear until about a month after the first reports in the US. ...
  40. Replies
    6
    Views
    702

    It's true. As trippintl0 said, the ZS low temp...

    It's true. As trippintl0 said, the ZS low temp scrolls can handle the amp load over a wide range of suction temps. It's true for the ZF series as well.

    It's also true that the condenser size...
  41. Replies
    6
    Views
    675

    Here's the MasterBilt walk-in manual (See...

    Here's the MasterBilt walk-in manual (See p.14-15): https://master-bilt.com/docs/default-source/specification-sheet/walk-ins-manual.pdf?sfvrsn=19

    You'll need some shims to put under the door to...
  42. Replies
    7
    Views
    379

    You must have missed the scrolling yellow banner...

    You must have missed the scrolling yellow banner notice at the top of the home page that Dad had up for weeks stating that all content would be lost forever when the switch is made back to the old...
  43. Replies
    25
    Views
    1,696

    Sorry....I had a brief BIden event. ;) The...

    Sorry....I had a brief BIden event. ;)

    The time delay would still be the way to go to eliminate the possibility of excessive short-cycling. If the Core Sense still trips at least you've...
  44. Replies
    25
    Views
    1,696

    I first started seeing this short-cycling on...

    I first started seeing this short-cycling on shutdown about 10 years ago with Copeland scrolls, both low and medium temp. typically it was just one or two quick re-cycles but sometimes I observed up...
  45. As explained earlier, frost doesn't always mean...

    As explained earlier, frost doesn't always mean floodback. Here's a pic of a supermarket rack with a measured 28F of suction superheat...ie, textbook normal conditions for the application:

    ...
  46. Good explanation, but you forgot to include the...

    Good explanation, but you forgot to include the evaporator TD.

    So assuming a -12F box temp and a 10F TD, the SST would be -22F.
  47. Replies
    23
    Views
    2,529

    Probably the most useful capability of the Supco...

    Probably the most useful capability of the Supco Balance Tester is you can install a new cap tube and test it to see if it properly balances with the compressor capacity. If the test pressure is too...
  48. Replies
    23
    Views
    2,529

    The cap tube balance tester is intended to be...

    The cap tube balance tester is intended to be used for testing the captube to see if it's partially plugged up, for testing the capacity of the cap tube compared to the capacity of the compressor as...
  49. Replies
    10
    Views
    702

    Burning HFC refrigerants cannot produce phosgene...

    Burning HFC refrigerants cannot produce phosgene because HFCs contain no chlorine, however they do contain fluorine and so produce hydrogen fluoride (hydrofluoric acid) which can be as bad or worse...
  50. Replies
    43
    Views
    1,629

    "Guests" include much more than just unregistered...

    "Guests" include much more than just unregistered members and lurkers. The majority of hits on the site are from search engine bots from Google, Yahoo, Bing, etc. as they index the site. They help...
Results 1 to 50 of 1000
Page 1 of 20 1 2 3 4
Contracting Business
HPAC Engineering
EC&M
CONTRACTOR