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Need A/C help

Discussion in 'HVAC' started by Boomer, Jul 7, 2020.

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  1. Capt J

    Capt J Senior Member

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    You need a new A/C tech......you need to change them when going to 410.
  2. Boomer

    Boomer Senior Member

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    Appreciate it
  3. Pascal

    Pascal Senior Member

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    On most boats having to replace the lines is either impossible or requires major work
  4. MBevins

    MBevins Senior Member

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    I'm in the situation right now, my tech doesn't see the need to replace the lines either. Quite frankly I hope that is accurate, replacing them would double labor costs and tear the boat open as I have an evaporator under the helm on the bridge.
    Not a fun situation.
  5. Capt Ralph

    Capt Ralph Senior Member

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    Your operating at twice the pressure on old lines.
    You call it and live with it.
  6. Capt J

    Capt J Senior Member

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    See post #69 from Capt. Ralph as well.

    410 use a different oil and cannot get all of the oil out. 410 operates at a much higher pressure than r22 and generally utilizes larger lines than r22. Like I said before, you need a better A/C tech that isn't going to cut corners if you want the unit to last. If an A/C tech told me this, given the age of your boat, I'd throw him off of the boat immediately. Do you really think it's a wise idea to re-use 25 year old copper lines that have been in a salt environment, over again? Why ask the question if you're going to do it the wrong way anyways? Wasn't it this same A/C tech that recommended replacing the R 22 compressor that blew up in days?
  7. tbaxl

    tbaxl Member

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    Hmmm, got a quote yesterday to replace a 24k BTU split on my 48 Ocean Yachts SS which is 22 yrs young. Funky thing is one compressor is 24k but two 12k air handlers on the flybridge mounted side by side so 4 copper lines which, my tech whom I have used for many years says we only need to flush the lines for 410. I also heed advice from those who have more than one trip out the pass and back, probably need to discuss the issue more, $7600 just for the parts is not something I want to risk considering the old unit went 22 years. Anyone have a Taylor Dometic 24K BTU unit sitting on the shelf?
  8. Capt Ralph

    Capt Ralph Senior Member

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    Your split system is just like my saloon unit. Split 12kbtu evaps and single 24Kbtu condensing station.
    It is more expensive, but if you order parts for R417a, It will work on a R22 system.
    If a condensing station is required, Reclaim the R417a that came in it, suck-all-down and charge with R22.
    Same oil, R417a Freon has same weight and close in properties as R22, just less offending to the EPA.
    But, R417a does not expand as much so does not work as well as R22.

    R417 was a make work Freon before the R410 systems came out.
    AC techs worth a shoot know this and should of recommended it to you and Boomer.
    Maybe they can not get R22 or R417a. Anybody can get R410a & R134a.

    Been a comment around that R410 was more efficient than R22.
    IMHO; Wrong.
    Where are any efficiencies when the expanding pressures have to be near doubled to make a product (R410a) work.
    Other than Propane, Ammonia or R12, R22 was one of the best.

    There are remaining solar powered ice makers that over night make 100s of pounds of ice.
    Ammonia based.
    Last edited: Sep 27, 2020
  9. Capt J

    Capt J Senior Member

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    What do you think the lift expectancy of copper lines and their braised welds is when exposed to almost 400 psi of pressure and salt air? Willing to bet they'll go another 22 years for a total of 44, or just F'ing change the lines like you're supposed to? 410 operates at a lot higher pressure on the high side than R 22 (220 psi versus around 360 psi). Also 410 uses 1 size larger, copper line set than R22, so you're restricting your brand new unit right from the get go. Do you want your brand new unit to last?

    Not changing the line set is like the guy that rebuilds the engine that blew up, but doesn't do the cooling system, turbo's, or injectors. These are the very same techs that say the new Dometic products are crap and fail early, when it's their installation that is crap.
  10. tbaxl

    tbaxl Member

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    Capt Ralph, I was hoping you would chime in. Not sure I am getting this correct, but two techs have informed me that I no longer have R22 in the system, is there a 471 or am I just getting my numbers back and it is really 417 in there now? The big problem I have is to replace the air handlers I will have to cut a largeish hole in the brow of my flybride but no one is giving me options to just replace the compressor side while the condensors are blowing strong. I realize is it best to replace everything and be done with it, just not a fan of cutting holes where some engineer never thought about replacement.
  11. tbaxl

    tbaxl Member

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    I am thinking I need to find another service tech to give his opinion. I have lurked quite some time and have read enough from Cpts J and Ralph to heed their advice when I ask for it. Thank you gentlemen.
    Tim
  12. Capt Ralph

    Capt Ralph Senior Member

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    I'm confused; lets start again, Where is your failure?
  13. Capt J

    Capt J Senior Member

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    I've skinned this cat several times.

    1. R417 is about 20% less efficient than R22, that is true. I manage a yacht that had 6- R417 self contained units, temps out of the ducts were 56-58F of each unit. We dropped the 417 and put R 22, temps out of the ducts dropped to 44-46F out of every single unit, it made a big difference in the interior temperature of the yacht.

    2. 410 is a lot more efficient. Overtime we've changed out 5 of those 6 self contained units. Not only do the new units have turbo blowers which move a lot more air, but the air temp out of the vents on each one is 34-36F now and we've dropped around 8 amps with all units running, which is a big deal as the boat only has a single 50 amp cord. Also interior temps in the helm area dropped noticeably when we were on it on a trip and had the temps set lower and half a dozen people...... 62' express.

    All of these temps measured in the summer in South Florida with hot sea water and hot air temps. I also changed out 2 chillers on a 62' motor yacht and also noticed an amp drop...........and it seemed like the interior temps of boat did better on 1 chiller (home dock only had single 50 amp)
  14. tbaxl

    tbaxl Member

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    Compressor in the engine room is leaking freon, most likely at the fittings and at 22 years old I am not surprised. The air handlers blow strong and and the cooling fins look good where I can see them, but my ac guy has me sold on needing a new everything but the copper lines, which I am convinced now should be swapped as well "if" I am going to do this. I am not above finding another and attempting a patch job with new fittings and since, I think, we have 417 in the system already pump it up and see what happens. Here in the northern gulf quality marine ac techs are in short supply, not to mention the mess we are dealing with from hurricane Sally.
  15. tbaxl

    tbaxl Member

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    Capt Ralph or J, you by chance have a recommendation for someone you know, Panama City FL to Biloxi MS?
  16. Capt Ralph

    Capt Ralph Senior Member

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    R417a was the EPA friendlier Freon replacing R22. It is not as good. You can not mix these gases.
    If you draw down the system for several hours, then recharge with R22. They use the same oil.

    Freon Stop Leak products are available but to be used as a last, desperate effort.
    Freon sniffers are cheap on line, Freon dyes are available also (Ole Black Light Specials).

    I have found leaks in all of the strangest places, but the most common is the service valve stems, Shrewder service valves, pressure switches and where they screw on (Shrewder valves stems), then the copper connects.
    Rare but have been found, the evaps ancillary lines and cores.
    On the bottom of this list is the copper tubing itself. Look for a wet spot (oil) on the ugly parts of the tubing to start.

    Then, fish lip ruptures on old coppers after R410 conversions.
    Flexible (not rigid) copper tubing come in thin and thick wall styles. You can guess what the factory used.....

    Keep us updated on what you find or need.

    crc
  17. Capt Ralph

    Capt Ralph Senior Member

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    I have not been to PC in a while.
    Hummmm

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  18. tbaxl

    tbaxl Member

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    Me either, and in those days I was much younger.
    Thank you again for your thoughts, i'll let you know how things work out, but I do think I will put total replacement on hold till I can do some trouble shooting.
    Tim
  19. Pascal

    Pascal Senior Member

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    $7600 for what? Just the condenser in the ER or for the condenser and the two air handlers?

    how did the guy find that the leak is at the fittings on the condenser ? Sniffer, die? Fittings can easily be repaired... that s no reason to replace an entire condenser.
  20. Capt Ralph

    Capt Ralph Senior Member

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    Hang on Pascal
    We got tbaxl thinking about it.

    It will take that much money to get me back to PC. Is it still retired X-rated? How was it a young person summer location?
    I remember my last trip east of there, Callaway... No dress code and it was a retirement area in the 90s. ug