Water pump for a/c unit

Discussion in 'General Discussion' started by Jbielec, Apr 16, 2018.

  1. Jbielec

    Jbielec New Member

    7
    Apr 16, 2018
    2001 SeaRay Sundancer 310
    Twin 5.7 w/ B3
    Hello Everyone,
    I'm just picked up a 2001 310 Sundancer and its floating well in the slip.

    My question, is when turning on heater/ac unit the system turns off due to no water flowing.
    I cleaned the strainer and then found water pump not on when I try turning unit on.

    I removed pump and bench tested, it works.

    My question is, (cause this boat is new to me) is there another switch that needs to be on at the panel other then A/C unit, For this water pump to work?

    Thanks Jason
     
  2. Jbielec

    Jbielec New Member

    7
    Apr 16, 2018
    2001 SeaRay Sundancer 310
    Twin 5.7 w/ B3
    I tested the power going to pump when turning unit on and no change. I believe what ever tell this pump to turn on is not doing it job. Just don't know what that part is or is there another switch that has to be on for this to work..

    As soon as marina turns water on I will be connecting water supply to hose after pump to finish testing system fully. ( I believe system will work just fine as pink RV fluid came out of hose when I disconnected from pump, so it was winterized)
     
  3. JVM225

    JVM225 Well-Known Member

    Apr 8, 2008
    Farmingdale, NY
    2002 410 Sundancer, Monaco Edition.
    3126 Cats.
    It may just need to be primed. You just need to get water in to the pump itself.
    I found the easiest way to prime the pump is to momentarily remove the hose from the discharge side of the pump with the AC (and pump) off. After a second or two, water will come out of the discharge side of the pump. Shove the hose back on and relighted clamps.
    Turn on the AC, and you should be good to go.
    Others report that just taking the boat for a ride will do the same thing but that never worked for me on my old 300. It’s probably a result of the shape of the hull and the spot where the pump is mounted in an individual boat.
    I always had to prime it the way I described when the boat went back in the water.
     
    Jbielec likes this.
  4. Jbielec

    Jbielec New Member

    7
    Apr 16, 2018
    2001 SeaRay Sundancer 310
    Twin 5.7 w/ B3
    Thank you,
    I will try this out today.
    I also went for 2 rides and didn't seem to prime for me also.
     
  5. barros57

    barros57 Member

    33
    May 19, 2015
    Lake Minnetonka, MN
    350 Sundancer 1991 "Sunny Daze"
    268 Sundancer 1987 "Offshore Drilling"
    454 7.4L Mercruiser Bluewater Inboard, Hurth V Drives
    350 5.7L Mercruiser 260/V8
    The fan on the AC unit should turn on first. There is about a 1min delay before the AC compressor and water pump turn on. Are you sure you are waiting long enough for the pump to turn on?
     
  6. Jbielec

    Jbielec New Member

    7
    Apr 16, 2018
    2001 SeaRay Sundancer 310
    Twin 5.7 w/ B3
    Hi,
    Yes I believe I am, the system will turn off due to no water flow on it's own.
    When AC on it gets cold
    When heat on it will get warm

    But then turn of with PS hi or lo code
     
  7. Jaybeaux

    Jaybeaux Active Member SILVER Sponsor

    218
    Jan 3, 2016
    Upper Potomac River
    420 Sundancer 2004
    Naught On Call
    Cummins 6CTA-8.3's with V-Drives
    9KW Onan Genset
    I bring this up because you didn't mention it specifically.....Is the seacock open? It is before the strainer.

    Jaybeaux
     
  8. barros57

    barros57 Member

    33
    May 19, 2015
    Lake Minnetonka, MN
    350 Sundancer 1991 "Sunny Daze"
    268 Sundancer 1987 "Offshore Drilling"
    454 7.4L Mercruiser Bluewater Inboard, Hurth V Drives
    350 5.7L Mercruiser 260/V8
    It sounds like he has no voltage at the pump so this is not related to a priming issue. Do you have two AC units? Also what brand are the AC units?
     
  9. Jbielec

    Jbielec New Member

    7
    Apr 16, 2018
    2001 SeaRay Sundancer 310
    Twin 5.7 w/ B3
    Good question, thanks for asking.
    Yes I do
     
  10. Jaybeaux

    Jaybeaux Active Member SILVER Sponsor

    218
    Jan 3, 2016
    Upper Potomac River
    420 Sundancer 2004
    Naught On Call
    Cummins 6CTA-8.3's with V-Drives
    9KW Onan Genset
    barros57.....if the question was for me, yes, I have 2 AC units. They are "driven" by only one water pump.
     
  11. Jbielec

    Jbielec New Member

    7
    Apr 16, 2018
    2001 SeaRay Sundancer 310
    Twin 5.7 w/ B3
    I only have one unit

    I will add, I check wires at junction box with OHMS meter and it said 3
    So I'm getting power but I don't know if its right.

    I also checked with a test light that tells me volts
    It didn't tell me what volts just that it had + or - flow.

    Redid connections after bench testing pump at home.


    Beyond that I'm clueless
     
  12. Jus the two of us

    Jus the two of us Member GOLD Sponsor

    64
    Dec 7, 2015
    United States Lake Cumberland
    1998 Sundancer 450
    3116 Cats
    On our 1998 450 there is a switch, Breaker, in the panel for the pump itself. If you do not turn it on first, before you turn on the two units they will do exactly what you are saying.
     
  13. liv2ryde100

    liv2ryde100 Member

    281
    May 17, 2012
    long island
    05' 340 dancer
    Twin 8.1's
    Is it warm enough tho there for the compressor to kick on? Maybe it’s too cold out and compressor isn’t coming on also? Tune u it on, air starts blowing out, then compressor kicks on, then water flow from pump. Is this what u have happening? Or just air blowing and no compressor
     
  14. Jbielec

    Jbielec New Member

    7
    Apr 16, 2018
    2001 SeaRay Sundancer 310
    Twin 5.7 w/ B3
    Thanks everyone for your input.

    I stopped by boat in the snow lol, and removed exit hose from pump and turned seacock to open. Water came out pump and then I turned on unit after reconnecting hose.
    It started to discharge water out the side of boat and I had heat.
    So it was that I just had to prime the pump....


    THANKS !!!
     
    Jaybeaux and importmonkey like this.
  15. bbwhitejr

    bbwhitejr Well-Known Member SILVER Sponsor

    Apr 14, 2013
    Lake Lanier GA
    2007 44DB
    Cummins QSC 8.3s
    The cheapest “fixes” can be the best.

    Congrats!

    Bennett
     
  16. JVM225

    JVM225 Well-Known Member

    Apr 8, 2008
    Farmingdale, NY
    2002 410 Sundancer, Monaco Edition.
    3126 Cats.
    Glad it worked for you. That’s the quickest and easiest way to do it if you need to prime. Some boats just won’t prime by going for a ride.
     

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