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  1. I had a similar problem, I tried thinking of...

    I had a similar problem, I tried thinking of something and just replaced the whole unit.

    Most cases the evap is so expensive it's not worth replacing just the evap so I Replace the whole thing and...
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    The difference is that there may be a safety...

    The difference is that there may be a safety preventing the contactor from pulling it in, one you might not be aware of, some safeties are not very big.

    Also, having your hand directly in front of...
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    Bberme, Haha, I know what you mean, I hate it...

    Bberme,

    Haha, I know what you mean, I hate it when I make mistakes like that.
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    True, but you and the company you work for should...

    True, but you and the company you work for should be given professional service, unfortunately there are hacks in the world that don't care about quality, it's good enough for a while, but they know...
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    Interesting approach but I can understand your...

    Interesting approach but I can understand your boss wanting an objective viewpoint.

    So here's the question though, you said you had a large amount of units, so the "failure rate" is what? Is it a...
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    Well to figure out how to make it better, WHAT...

    Well to figure out how to make it better, WHAT are you trying to make better? Humidity? Cooling effeciency? It's not cold enough? Units never shut off?
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    Yeah I got you Bberme. Well, what are you...

    Yeah I got you Bberme.

    Well, what are you curious about? What application? Ask about residential first, then refrigeration, or whatever you want to know.
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    If you look at the link I posted for you, go to...

    If you look at the link I posted for you, go to page 27 and read from there, or a couple of pages back, it's charts showing capacity of refrigerants, if you really want to know about it, enthalpy...
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    I think he's just curious. Kind of like...

    I think he's just curious.

    Kind of like asking your mechanic how a basket clutch works, doesn't mean you will take it apart and do anything with it, but you just want to know because you are...
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    CX12. Everything you said seemed correcet,...

    CX12.

    Everything you said seemed correcet, except I don't believe that the high head is going towards the lower pressure area, I simply think the compressor is pushing it that way. It's not low...
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    If it's any help at all, I had a fairly...

    If it's any help at all, I had a fairly longwinded discussion with these guys about refrigerant, answered one of my most basic questions.
    ...
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    Okay, I just figured it made more sense when the...

    Okay, I just figured it made more sense when the line crosses to the next constant entropy line, it's never right at the vapor saturation curve but since there's supposed to be SH, I figured that's...
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    Ice, I did have another question on Mollier...

    Ice,

    I did have another question on Mollier charts where the compression begins, the refrigerant is slightly superheated as it leaves the saturated vapor curve, I assume that's the superheat you...
  14. Check the low water probe, wire's either broken...

    Check the low water probe, wire's either broken or there's no water in it. Do you see water in the gauge?
    First thing's first is to verify you actually have water in the jacket, THEN check the probe...
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    Sweet! Thank you. :cheers:

    Sweet!

    Thank you. :cheers:
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    Poodle, That's crazy, I can't even imagine...

    Poodle,

    That's crazy, I can't even imagine that, I once lost about 10 lbs of R22 when a line broke accidentally and I felt so bad.
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    404A 809904

    404A

    809904
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    Woop! Thanks a lot Ice, and everybody else. I...

    Woop!

    Thanks a lot Ice, and everybody else. I appreciate all the help. I'll post a 404A one shortly, hopefully I got it.
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    Yeah, sometimes I hear these stories like yours...

    Yeah, sometimes I hear these stories like yours and It's odd, it's so instilled on us yungins that purgin is illegal, nitro, triple purge, micron gauges is the way to go, no other way, 500 and below...
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    Sorry, I seem to have been misunderstanding...

    Sorry, I seem to have been misunderstanding something.

    How bout this?

    809903
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    I thought I did, if you look at the right side...

    I thought I did, if you look at the right side where it says 124 BTU, that straight up is the 105* mark on the constant entropy numbers, or at least I thought it was.
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    Okay, I think I got it this time, I switched to...

    Okay, I think I got it this time, I switched to R134 to keep it interesting.

    You know me so well, lol I just guessed and called it good.

    I figured out what you were saying afterwards.

    On the...
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    Nevermind, I read your post about 20 times and...

    Nevermind, I read your post about 20 times and looked at the diagram, I got it now, follow the constant entropy OVER until you get the refrigerant temp (105*F) then mark it up and that's the outlet....
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    It goes a little something like this. ...

    It goes a little something like this.

    Hic-Hec=HOC

    Hic= Enthalpy of vapor leaving compressor
    Hec= Enthalpy of Vapor entering compressor.

    So the above would be Hec=96 - Hic=110 = 14 BTU/LBS...
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    Okay, You're right, I Didn't. How do you...

    Okay,

    You're right, I Didn't.

    How do you figure the heat of compression (HOC) measurement?

    Is that right?

    809890
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    Let me get this straight, I think im converting...

    Let me get this straight, I think im converting PSIG to PSIA backwards.
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    Ambient 90*F, 15 TD = 105*F/254.2 PSIG - 14.7 (To...

    Ambient 90*F, 15 TD = 105*F/254.2 PSIG - 14.7 (To make it PSIA) = 239.5 PSIA
    Box temp 37*F, 10 TD = 27*F/ 66.3 PSIG - 14.7 (To make it PSIA) = 51.6 PSIA

    So, here we go. I just copied the R22...
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    Ice, I'm almost done with my chart, I don't...

    Ice,

    I'm almost done with my chart, I don't know if it's correct.

    Give me 15 minutes I'll have it up.
  29. What you posted is not a defrost mechanism. ...

    What you posted is not a defrost mechanism.

    Some walk in's rely on "turning off" as a defrost, that's how a lot of what I work on are.

    But if the issue is that it's freezing up all the time,...
  30. These guys beat me up and chew me up and spit me...

    These guys beat me up and chew me up and spit me out more times than I can count.

    But it's worth it every time.
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    That's what I was missing, I can't believe I...

    That's what I was missing, I can't believe I never realized that.

    I got dragged away to go weld something so I should have a chance to work on this a little later today.
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    And the crowd goes wild. That's what I was...

    And the crowd goes wild.

    That's what I was missing all this time, I never even considered the same concept as the evaporator being applied to the condenser DUH!

    Okay, let me give this a go,...
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    Alright, Entropy has been left to sink in the...

    Alright, Entropy has been left to sink in the ocean by itself, one day though, I will understand it.

    Okay, Ice, I don't know how to figure out what my head pressure is based off my ambient, not...
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    Lol. Just wanted to throw it out there. But...

    Lol. Just wanted to throw it out there.

    But let's stay on the topic of enthalpy and entropy for a minute here, I'm trying to understand it.

    So here's a question, how do you find out what your...
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    Okay, so I read the 5-200 Sporlan bulletin,...

    Okay, so I read the 5-200 Sporlan bulletin, that's where I got the chart from I posted.

    So I get the Enthalpy part, it's useful for designing systems or I guess, picking refrigerants for...
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    Alright PHM, true, and I understand that part of...

    Alright PHM, true, and I understand that part of Entropy as wasted, much like the heat added to the refrigerant as a vapor when it's compressed, as shown on the chart, it's not usefull. But I don't...
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    So you can use it to see what the cooling...

    So you can use it to see what the cooling capacity is of a refrigerant or map it out on the chart to figure out what pressure you want to operate within?

    What is "H" Enthalpy?

    Essentially you...
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    Right, Entropy from what I understand is...

    Right, Entropy from what I understand is essentially energy that's wasted or useless, much like the compression cycle where the vapor is compressed and superheated, all the energy you put into that...
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    Right, so the enthalpy increase and decrease, in...

    Right, so the enthalpy increase and decrease, in order for you to get the cooling you want, you have to compress the vapor which adds heat, heat that you can't use for anything, it's just a byproduct...
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    Can we discuss what Entropy and Enthalpy means. ...

    Can we discuss what Entropy and Enthalpy means.

    My boss and I have been trying to understand it for an hour now. I think my brain is actively trying to make me forget the word to reduce the amount...
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    I'm so lost on that diagram.

    I'm so lost on that diagram.
  42. Just charge it off superheat and subcool, it's...

    Just charge it off superheat and subcool, it's not as easy but it's the only other way to do it other than factory.
  43. Yeah, I have to agree, bypassing safeties is a...

    Yeah, I have to agree, bypassing safeties is a risky thing.

    If you KNOW it's cutting out on high head, something's gotta be wrong, the only times pushing in the contactor would be remotely OK...
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    Wow, that's interesting. I far from understand...

    Wow, that's interesting.

    I far from understand it but that makes some sense.
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    :cheers: I looked at some Enthalpy diagrams...

    :cheers:

    I looked at some Enthalpy diagrams yesterday, trying to understand it.

    What do you use it for?
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    That is very true. Myself included.

    That is very true.

    Myself included.
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    We're all just a bunch of Punkah Wallahs ...

    We're all just a bunch of Punkah Wallahs

    https://en.wikipedia.org/wiki/Punkah_wallah
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    Fair enough, it's true. I'm thinking more in...

    Fair enough, it's true.

    I'm thinking more in line with refrigeration as that's what I mainly deal with, where you don't get much wiggle room in terms of airflow or SST.
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    Not quote I don't think, Eventually you would...

    Not quote I don't think,

    Eventually you would have no refrigerant in the coil and so you wouldn't be removing any heat or the coil would just freeze up blocking your heat transfer.

    Or you would...
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    French, it must be french you are speaking.

    French, it must be french you are speaking.
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