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Island Runner?

Discussion in 'Post Yacht' started by baltimore bob, Mar 27, 2017.

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  1. baltimore bob

    baltimore bob Member

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    Has anyone herd from him? Have contact info? His thread on the restoration of his 42 has been an inspiration.

    Also, I need his help. His boat should have been set up the same as mine, a 16,000 btu air conditioner for the salon and a 12 or 10,000 (not sure which, probably 12) running the stateroom and forward bunks. I seem to remember him posting that he replaced both condensers with 16k units. I get conflicting information on putting a larger condenser in while retaining the original evaporators. If he did this, then my question is answered and I can install the 16K condenser I have on hand. Opinions welcome!
  2. Tommy Rice

    Tommy Rice Member

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    Bigger is always better if you have the power available to operate it. I have been replacing my units with the self contained systems ( all you need is hooking the cooling water to the unit) @ $1500 to $1600 they are a great buy. Most have digital thermostats and reverse cycle heat and air. You can turn the temp down or up and have the reserve capacity to do the job more efficiently. As for the 16 K unit I'm not sure but depending on the age of the evaporator and the cost of the tech you will have to decide what to do.
    Good luck
  3. mwwhit1

    mwwhit1 Senior Member

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    I was under the impression too that putting larger units in would be better. But I read that is not always the case. The biggest part about A/C is removing humidity. Sizing so it runs enough to get the water out of the air is just as important as it feeling cold. I don't think putting a larger unit for the lower level is necessarily better. It will be too cold coming out and not run enough to condense the water out of the air. It will shut off too fast because of temp drop. Could also freeze up. Though I would agree when it is hot out and the sun blazing, that the salon unit can't keep up well and is probably undersized.
  4. baltimore bob

    baltimore bob Member

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    I replaced the salon unit with a self contained. The unit in question is a split system for the stateroom and forward berths where I do not want to replace the evaporator units. Judging by the compressor's physical size (it is a rust pile with no legible markings) it is a 12,000 or possibly a 10,000 btu unit. The question is, can I put a 16K condensing unit in place of the smaller one to operate the original evaporators?
  5. Capt J

    Capt J Senior Member

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    Look at the air handlers and see how many BTU's they are. If the 2 of them are over 16k btu's, then most likely yes it should be a problem. But get the BTU's of the 2 air handlers and give dometic a call, they should be able to answer your question for sure. How did the old unit cool? Was it enough cooling capacity or not enough?
  6. Tommy Rice

    Tommy Rice Member

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    As long as there is no problem with the return air the temp setting will determine how cold the area your cooling will be. The extra BTU capacity is there if you need it. As the return air comes back to your evaporator it pulls the humidity out of the air. Or that was the way it was explained to me. Also for you Bob my 46 has the same system midship to cool the after crews quarters and the forward salon/galley area and the compressor is a 16k unit. So the question is does the 42 have the same capacity midship. My after unit is a self contained 12 k and the forward unit is a 10k. : Note the middle split system has a single air handler with split duct work.
  7. Tommy Rice

    Tommy Rice Member

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    Capt J has the best answer for what you need to know. Calling the experts in this field will answer these questions on a professional level.
  8. Capt J

    Capt J Senior Member

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    I've NEVER seen a yacht that was over air conditioned to where this would be a problem.
  9. Rover1

    Rover1 Member

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    My original split unit in the salon went at the beginning of the heat wave for me last year. I got one of those portable ac units that look like R2D2. Had it drain into the sink. What a waste of time that was I think it helped with the salon but doubled the heat downstairs! So finally I got one of those slef contained units what a diffrance ! Total going to replace the downstairs bedrooms with one. Looking to keep that 42 like a morgue!
  10. baltimore bob

    baltimore bob Member

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    As I said, I already went to self contained for the salon, but it is not practical to do that for the stateroom or forward berths. I hate to not use the 16K condenser I have on hand if it would work.