My 16,000 BTU Aft AC Unit Crapped Out

Discussion in 'General Maintenance/Repair Questions' started by electricaldoctor, Sep 10, 2015.

  1. electricaldoctor

    electricaldoctor Well-Known Member TECHNICAL Contributor PLATINUM Sponsor

    May 14, 2008
    Thousand Islands, Rockport, Ontario.
    1988 390 EC
    454 Mercruiser Gassers
    IMG_20150726_092403.jpg IMG_20150726_092433.jpg IMG_20150726_092535.jpg IMG_20150726_092546.jpg 16k unit.jpg

    The circuit board in the control box needs replacing as well because it will not shut off the AC water pump once the thermostat(s) are satisfied.

    Any ideas how many boat bucks this is going to set me back?

    ~Ken
     
  2. nickdcj7

    nickdcj7 Member

    233
    Jan 5, 2014
    Bass River, NJ
    1986 390 EC
    Twin 454 Mercruisers
    That circuit board looks to have about $10 worth of components on it, and it's an old-school design which can be easily worked on with normal soldering equipment.
     
  3. electricaldoctor

    electricaldoctor Well-Known Member TECHNICAL Contributor PLATINUM Sponsor

    May 14, 2008
    Thousand Islands, Rockport, Ontario.
    1988 390 EC
    454 Mercruiser Gassers
    I wouldn't know where to begin.
     
  4. Jmwarren

    Jmwarren Member

    417
    Jul 14, 2011
    Ontario
    390 Motor Yacht
    Cummins - 480CEs
    Those units are usually around 2.5k.

    They are the same as Cruisair with different controls.

    If the compressor and air handler is OK you may just be able to replace the electronics…

    I can’t believe the unit itself is bad as that’s the newer design that came out just a few years ago.
     
    Last edited: Sep 10, 2015
  5. nickdcj7

    nickdcj7 Member

    233
    Jan 5, 2014
    Bass River, NJ
    1986 390 EC
    Twin 454 Mercruisers
    they want $250 for that board. four resistors, three capacitors, two triacs, and two timer chips. I bet the terminal strip is the most expensive thing on there. I guess I'm in the wrong business... I would find a local electronics repair shop if you're not comfortable messing with it. They could probably fix yours for half the cost of new.
     
  6. Saverio

    Saverio Active Member

    Aug 31, 2010
    Long island new york
    1995 330 DA
    Twin 454 Webber Carbs
    V drives
    Fresh water cooled
    Ken

    what is wrong with it?

    Saverio
     
  7. bahamabreisus

    bahamabreisus Well-Known Member

    Oct 25, 2007
    Hampstead NC
    500 dancer, previous 420,390,300 dancers
    detriot 8v92
    If that's the original unit, I would consider strongly replacing the entire unit. There are other brands that can be purchased for $1500.00 and up. You can spend a lot of money chasing the problem. New units are easy to install, 2 hoses and some wires. I assume it the unit under the salon coach, easy to get at. The new ones are also much more efficient.
     
  8. Saverio

    Saverio Active Member

    Aug 31, 2010
    Long island new york
    1995 330 DA
    Twin 454 Webber Carbs
    V drives
    Fresh water cooled
    the compressor looks to be a few years old
    its in great shape
     
  9. fwebster

    fwebster Well-Known Member TECHNICAL Contributor PLATINUM Sponsor

    Oct 6, 2006
    Middle Tennessee ; Panama City Beach, FL
    1996 450DA
    3116 Caterpillars
    I agree with replacing the entire unit. Besides efficiency, there are a more reasons. The newer units are not fully compatable with older ones so when you change compressors, which is what usually bites the dirt first, you also have to change the controls. We found that new package units are a lot cheaper to buy than trying to piece old and new together. The other big reason is that the new turbine compressors are infinitely quieter than the old piston compressor designs. We have gradually replaced both of our A/C units and the noise difference in the cabin is striking.

    Dometic now owns both Cruise Air and Marine Air so the choices are simpler. Our marine has installed several Webasto units lately with very good results. I think they bear a serious look. I believe they are Chineese but they are like 50% cheaper. The service manager's opinion is that with labor rates now over $100/hour, they will be throw-aways that you can replace cheaper then repairing.....but so far, none have needed any repairs.
     
  10. Mike Blake

    Mike Blake Active Member

    Jan 27, 2012
    Yankeetown FL West coast
    89 340 Sundance all Raymarine.
    Gas hogs 454X2.
  11. Saverio

    Saverio Active Member

    Aug 31, 2010
    Long island new york
    1995 330 DA
    Twin 454 Webber Carbs
    V drives
    Fresh water cooled
  12. electricaldoctor

    electricaldoctor Well-Known Member TECHNICAL Contributor PLATINUM Sponsor

    May 14, 2008
    Thousand Islands, Rockport, Ontario.
    1988 390 EC
    454 Mercruiser Gassers
    Hi guys. I should have explained that pic of the AC unit is a brand new one. Mine still has the original 3-knob control, so I welcome the new digital control pad. I have not bought it yet. He wants $1,650.00 CDN and will toss in the control box for a total of $1,800.00 CDN or approx. $1,365.00 USD

    ~Ken
     
  13. Mike Blake

    Mike Blake Active Member

    Jan 27, 2012
    Yankeetown FL West coast
    89 340 Sundance all Raymarine.
    Gas hogs 454X2.
    If that's a 16BTU not to bad of a price. I replaced mine with a 20BTU Much better!! Remember I'm in fl.
     
  14. Mike Blake

    Mike Blake Active Member

    Jan 27, 2012
    Yankeetown FL West coast
    89 340 Sundance all Raymarine.
    Gas hogs 454X2.
    I forgot to say, make sure you have the hose and discharge ports the same as you have. I changed mine out in less than 2 hrs.
     
  15. electricaldoctor

    electricaldoctor Well-Known Member TECHNICAL Contributor PLATINUM Sponsor

    May 14, 2008
    Thousand Islands, Rockport, Ontario.
    1988 390 EC
    454 Mercruiser Gassers
    It does look like an easy swap out for sure. I could save some more $$ if I knew how to trouble shoot the components on the control box circuit board. Can the components be tested right on the board or do they have to be de-soldered? I have all of the test equipment, but I am lost when it comes to electronics.
     
  16. FootballFan

    FootballFan Well-Known Member

    Jun 20, 2012
    Florida
    Marquis 59
    MTU Series 60
    Replaced a cruiseair unit a couple of months ago. I didn't do the work, had someone do it. Unfortunately is was the unit in the forward cabin that required the bed to be dissembled. I think total cost parts and labor was 2,500 to 3,000. I could look up the invoice if it mattered. But generally the prices you are hearing are inline.

    Mark
     
  17. dpmulvey

    dpmulvey New Member

    Dec 19, 2007
    Homeport: Charles City, VA
    1999/2007 330 Sundancer Hardtop.
    6.2 Merc Horixons
    1.5:1 Velvet Drives
    I'm a bit confused. Are you saying the RWC pump for the unit runs constantly after the compressor shuts down or the RWC pump and the compressor never shut down.

    If the former, so what. The pump is damn near bulletproof and the water you boat in is cleaner than what comes out of a faucet in my town. I know a few who have had the problem you have and just bypassed pump part altogether. Put an on/off switch for when the weather was comfy for no HVAC.
     
  18. electricaldoctor

    electricaldoctor Well-Known Member TECHNICAL Contributor PLATINUM Sponsor

    May 14, 2008
    Thousand Islands, Rockport, Ontario.
    1988 390 EC
    454 Mercruiser Gassers
    The water pump runs continuously. It is on it's own breaker, so there is no problem shutting it off when not required. I just replaced the pump a few weeks ago, so I thought that this would be a good time to address the problem and have the system operate how it was originally intended to. The circuit board is way overpriced, so it would be neat to make the repair on my own. A little help on how to trouble shoot the components would be well appreciated.

    ~Ken
     
  19. electricaldoctor

    electricaldoctor Well-Known Member TECHNICAL Contributor PLATINUM Sponsor

    May 14, 2008
    Thousand Islands, Rockport, Ontario.
    1988 390 EC
    454 Mercruiser Gassers
    My guess is that the triac is stuck closed and keeping the water pump running continuously.
     
  20. Saverio

    Saverio Active Member

    Aug 31, 2010
    Long island new york
    1995 330 DA
    Twin 454 Webber Carbs
    V drives
    Fresh water cooled
    Ken

    its real hard to test componets on the board due to you will get feedback from the circuit and not a true reading.

    I have the same unit if you need any info or specs let me know

    Saverio
     

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