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  1. Replies
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    Honeywell and others are developing next...

    Honeywell and others are developing next generation refrigerants that have lower GWP. They are HFO's (hydro-fluoro-olefins). Potential replacements for 404a are currently know as N-20 and N-40. These...
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    Curious if you resolved the problem...

    Curious if you resolved the problem...
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    Yup, any time I see an iced evaporator, first...

    Yup, any time I see an iced evaporator, first thing I do is mark the clock. Then continue with preliminary inspection and gathering model/serial info.

    I've definitely seen dtfd's cause the...
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    Does suction line have a crankcase pressure...

    Does suction line have a crankcase pressure regulator? Not common on walk-ins, but I have seen them.

    But yeah, sounds like the other tech front seated the suction service valve, then opened it...
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    How high do the discharge and liquid line...

    How high do the discharge and liquid line pressure get during pumpdown? Do you trust the HPC's?

    Also, is it possible that the blowouts are not happening at the same time, but that one unit fails...
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    This particular one is thru the board.. no...

    This particular one is thru the board.. no contactor.
  7. Replies
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    Thanks. Good info.

    Thanks. Good info.
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    Yes I tore down the "failed" compressor. The oil...

    Yes I tore down the "failed" compressor. The oil was sludge and crankshaft was scored due to clogged oil journals. Evidently it had a history of running with a plugged condenser.

    I was more...
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    Interesting. Any other info or elaboration? Such...

    Interesting. Any other info or elaboration? Such as how to diagnose the board and it's components, or where to get replacement cheesy relays for this board? If I'm not mistaken they seem obsolete,...
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    Brings back memories!:whistle::grin2::angel:

    Brings back memories!:whistle::grin2::angel:
  11. Replies
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    Hey Garya505, is Nunzio's pizza still around?...

    Hey Garya505, is Nunzio's pizza still around? I've been gone for several years, but their pepperoni with green chile was the best pizza back in the day. I used to get slices of Dion's for 25 for...
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    Ah my home town. Go to Garduno's and get the...

    Ah my home town. Go to Garduno's and get the chile relleno and tamale. Red on the tamale, green on the relleno. Nothing wrong with little anita's. Good huevos.

    To do: take the tram up to the top...
  13. That's guessing. You should figure out why the...

    That's guessing. You should figure out why the start winding is pulling current after start up.
  14. Reachin = 20 td. Walkin = 10 td.

    Reachin = 20 td. Walkin = 10 td.
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    Never mind... I got it. Interesting though;...

    Never mind... I got it.

    Interesting though; no wear on any bearing surfaces, rod/crankshaft surfaces, cylinder walls or pistons. But there is massive wear on the ends of one wristpin where it...
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    I'm resurrecting this old thread in hopes of...

    I'm resurrecting this old thread in hopes of getting the attention of someone (craig1, vtp?) that can help...

    I haven't had a chance to attend a Copeland tear down session yet, but I'd like to dig...
  17. Thread: w/i

    by mmmdave
    Replies
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    3,066

    It shouldn't be so much work to understand your...

    It shouldn't be so much work to understand your question. If you want our help, please take the effort to present your data in a clear manner. There are some really smart people on here and they are...
  18. Thread: Help

    by mmmdave
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    How fast is fast enough?

    How fast is fast enough?
  19. Replies
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    Never mind. Traced it to a wire/connector running...

    Never mind. Traced it to a wire/connector running in the cabinet wall that had come loose because only about a half millimeter of insulation was stripped off the wire in the factory... in case anyone...
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    Delfield rif defrost

    Working on a delfield reachin freezer model F2FH. Not defrosting.

    Verified: heater works, defrost relay works, timer motor and internal contacts ok, and jumping out termination tstat. No voltage...
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    Those pressures look ok. You'll want to get a SCT...

    Those pressures look ok. You'll want to get a SCT that's 25-30 over ambient, and evaporator temp 10 degrees below box temp. Shoot for a SH of 4-6. SC doesn't mean much assuming the system has a...
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    I've had some luck tapping the grids (carefully)...

    I've had some luck tapping the grids (carefully) back into place, where they sometimes stay for quite a while. Like Codgy said, it's just to nurse a little more life out of the machine.
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    Your head pressure should be about 40# lower. Is...

    Your head pressure should be about 40# lower. Is the condenser clean ALL the way through? Fans operating correctly?
  24. Thread: defrost timer

    by mmmdave
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    Wise words. :yes:

    Wise words. :yes:
  25. Thread: defrost timer

    by mmmdave
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    593

    On resi's, I'd say start relays (pepper shakers)...

    On resi's, I'd say start relays (pepper shakers) are the most common, followed by leaks. I don't see that many timers. But commercial,,, that's a different story with the unreliable defrost timers...
  26. Thread: timers

    by mmmdave
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    Which, as I said, is what I do. :yes: The...

    Which, as I said, is what I do. :yes:

    The purpose of the post was to try and get a deeper understanding of why this happens, especially since customers are starting to get tired of paying for new...
  27. Thread: timers

    by mmmdave
    Replies
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    1,443

    timers

    Any time I encounter a walk in freezer or reach in freezer with an iced over evaporator, the first thing I do is go mark the defrost timer dial to see if it's turning. If the timer doesn't move at...
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    Lol. But wait, there's more... The Kelvinator...

    Lol. But wait, there's more... The Kelvinator brand was then acquired by Electrolux who then sold it off to National Refrigeration. When they went out of business, Kelvinator got picked up by Global...
  29. MP66

    MP66
  30. Replies
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    I'll add to this... it is possible that your...

    I'll add to this... it is possible that your current off cycles and coil temp may not have changed, but that you have more humidity at the evaporator. Make sure the condensate is still being handled...
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    :ditto: I've seen 49's with semi's and...

    :ditto:

    I've seen 49's with semi's and hermetics.
  32. Replies
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    I had a customer a few years ago who's reach in...

    I had a customer a few years ago who's reach in freezer fan wouldn't work so he learnt how to fix 'er up on the Internet. Ordered himself a new fan delay on some website and installed it.

    After...
  33. Thread: Domestic refer

    by mmmdave
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    Too true. But in total, I expect to spend less...

    Too true. But in total, I expect to spend less than an hour on this unit and replace a $50 part. In this case, a new compressor or refer would not be the way to go IMO.

    But I hear what you're...
  34. Thread: Domestic refer

    by mmmdave
    Replies
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    1,302

    Domestic refer

    Working on a domestic whirlpool refer with an Embraco EGY-90HLP hermetic. PTC relay and cap fried but compressor still good (windings ohm out right and comp runs with my starting cord that I made)....
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    skp- for this test, are you saying to pump down...

    skp- for this test, are you saying to pump down using llsv or receiver outlet valve? I'm assuming llsv since it is such a long lineset..
  36. Replies
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    Is it 100 degrees on the rooftop?

    Is it 100 degrees on the rooftop?
  37. Every time I've called Delfield about TXV's, they...

    Every time I've called Delfield about TXV's, they are only able to give me the delfield part number; when I ask what sporlan number it is they tell me they don't know. Both the parts and the service...
  38. Replies
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    I've been known to charge critical systems by...

    I've been known to charge critical systems by SH/SC alone so don't take this the wrong way, but... doing it that way kinda assumes the rest of the system is functioning properly.
    Somebody much...
  39. Replies
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    I run into quite a few reach in freezers with...

    I run into quite a few reach in freezers with TXV's but no receiver. I've always supposed they should be treated pretty much the same as systems with receivers, although the need for a clean...
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    I would add to this... Before you added...

    I would add to this... Before you added refrigerant to the system, the cap tube restriction was causing low suction pressure, and lack of heat transfer then led to low head pressure as well. If I had...
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    Yes... but even if cap tube is not attached to...

    Yes... but even if cap tube is not attached to the suction line in a heat exchanger arrangement, the suction line can still pick up additional superheat from the ambient.

    I recommend measuring...
  42. Replies
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    15 psi for a reach in freezer sounds right to me....

    15 psi for a reach in freezer sounds right to me. 15-20 TD would give a box in the -6 to 0 range.

    Curious- why change the valve plate?

    And as others have asked, SC, SH (at evaporator outlet)?
  43. Replies
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    Ditto on the evap wiring. Please make sure to...

    Ditto on the evap wiring.

    Please make sure to let us know what you find... more than a few of us have been driven crazy by hard-to-find shorts.
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    That compressor uses a current relay. If the...

    That compressor uses a current relay. If the compressor is drawing too much current, it can keep the relay closed for too long, leading to the eventual toasting of the cap.

    If that's the cause,...
  45. Thread: Keep running

    by mmmdave
    Replies
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    817

    Good tip about the suction line. Turns out it...

    Good tip about the suction line.

    Turns out it was a blown head gasket. It was at that narrow section right between one of the suction/discharge valve pairs. Every time I see a blown head gasket,...
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    Dunno. I just had an entire thread deleted. Must...

    Dunno. I just had an entire thread deleted. Must have been something I said, I guess...
  47. Thread: Keep running

    by mmmdave
    Replies
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    817

    No. Good thought tho'. I managed to reproduce the...

    No. Good thought tho'. I managed to reproduce the behavior with a meter attached because I thought there could have been something electrical going on. But it's all mechanical. It *almost* sounds...
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    Yeah, same thing happens to me. I make sure the...

    Yeah, same thing happens to me. I make sure the charging hose is resting on the floor and try to put something on top of it, like a toolbox, so it is immobilized.

    Additionally, I also weigh the...
  49. Thread: Keep running

    by mmmdave
    Replies
    5
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    817

    Keep running

    I'm working on a cap tube freezer with a copeland kamb-007e-caa with 404a. I'll go into details of the main problem later if needed, but the thing I'm wondering about is: when I turned the unit off,...
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    Ah yes... Brain fart. I was sitting here...

    Ah yes... Brain fart. I was sitting here pondering a problem with a t49-f that I'm working on (honest), then got my wires crossed, so to speak. So much for multitasking. :oops:

    (either that, or I...
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