Fresh Water A/C pumps not bonded?

Discussion in 'Electrical Stuff' started by Carpediem44DB, Dec 31, 2021.

  1. Carpediem44DB

    Carpediem44DB Well-Known Member GOLD Sponsor

    Aug 18, 2015
    Sanfransico Bay area
    2000 Carver 506
    2006 44 DB Sedan Bridge
    Volvo TAMD 74 P
    I have always had an issue with water collecting in the center bilge and I noticed it is more pronounced when the A/C -Heat systems are operating. I assumed that it was the condensation form the condensers but realized now that the heat is being used, I get the same water intrusion. I finally decided to hunt down the source and have narrowed it to a leak in the water system to the aft systems. While troubleshooting I noticed that the A/C fresh water pumps/ motors are not bonded. I assume that since they are part of the AC system, they are grounded/bonded already so additional bonding is not required or even problematic. I understand the bonding system, but it gets fuzzy for me when it comes to the AC ground circuits.
    Carpe Diem
     
  2. hughespat57

    hughespat57 Well-Known Member

    952
    Sep 25, 2016
    Rock Hill, SC
    300 Sundancer 1994, trailered tri-axle LoadRite roller
    Mercruiser 5.7 260HP Alpha One Gen II, twin
  3. ttmott

    ttmott PhD in OCD TECHNICAL Contributor GOLD Sponsor

    Apr 3, 2012
    Space Coast Florida
    2006 52 Sedan Bridge
    Cummins QSM11
    "A/C fresh water pumps" - fresh water or sea water? Is your system hydronic or packaged units?
    Regardless, if the pumps are for sea water, then they should be bonded unless they are magnetically coupled like hughespat57 says then they are isolated. But it never hurts to bond them anyways.
     
  4. Carpediem44DB

    Carpediem44DB Well-Known Member GOLD Sponsor

    Aug 18, 2015
    Sanfransico Bay area
    2000 Carver 506
    2006 44 DB Sedan Bridge
    Volvo TAMD 74 P
    Duh, I meant sea water for sure. There are two pumps, one for the two bridge systems and one for the four cabin and salon units. It’s just odd on this Carver how somethings are bonded and others are not. One of the pump motors is covered in rust with no paint left and one still has paint but is showing corrosion. The pump sections are bronze and are unpainted and showing corrosion. I was concerned if bonding the motor frames would perhaps develop a ground loop or something weird.
    They work great so I’m going to remove them, clean them up and repaint them and go ahead and include them in the bonding circuit. They are about a foot away from the thru hulls that feed them and are bonded.
    Carpe Diem
     
  5. ttmott

    ttmott PhD in OCD TECHNICAL Contributor GOLD Sponsor

    Apr 3, 2012
    Space Coast Florida
    2006 52 Sedan Bridge
    Cummins QSM11
    Sounds like they are Oberdorfer pumps - they definitely must be bonded.
    IMG_5478.jpg
     
    Last edited: Dec 31, 2021
  6. Carpediem44DB

    Carpediem44DB Well-Known Member GOLD Sponsor

    Aug 18, 2015
    Sanfransico Bay area
    2000 Carver 506
    2006 44 DB Sedan Bridge
    Volvo TAMD 74 P
    Tom, what do you use to clean up the strainers and pumps? All of mine are green. Do you use a chemical etch of some kind and then a sealer or just Armstrong on a regular schedule?
     
  7. ttmott

    ttmott PhD in OCD TECHNICAL Contributor GOLD Sponsor

    Apr 3, 2012
    Space Coast Florida
    2006 52 Sedan Bridge
    Cummins QSM11
    I mix a solution of 10% pool acid (hydrochloric) and 90% DM water in a spray bottle. Spray it on the bronze dry until the bronze is completely saturated and let it set for about 10 minutes then rinse well sometimes have to brush with a sst brush. If it is bad then two applications. Then I mix baking soda with water and deluge the bronze and let it set to neutralize the acid the rinse well. Last time the boat was out I also rebuilt the strainers.
    IMG_5472 cropped.jpg
     
    Nater Potater likes this.
  8. Carpediem44DB

    Carpediem44DB Well-Known Member GOLD Sponsor

    Aug 18, 2015
    Sanfransico Bay area
    2000 Carver 506
    2006 44 DB Sedan Bridge
    Volvo TAMD 74 P
    Thanks Tom, that should make short work of that project for sure. I’ll post before and after pics. Getting this boat caught up the the shape I left my 44DB is proving to be a good second occupation ;)
     
    Nater Potater likes this.
  9. bbwhitejr

    bbwhitejr Well-Known Member SILVER Sponsor

    Apr 14, 2013
    Lake Lanier GA
    2003 420DA, 6CTAs
    NA
    Well aware of that feeling….

    Bennett
     
  10. ttmott

    ttmott PhD in OCD TECHNICAL Contributor GOLD Sponsor

    Apr 3, 2012
    Space Coast Florida
    2006 52 Sedan Bridge
    Cummins QSM11
    Sheech, I haven't seen my boat for a month.... And, it's only ten minutes from home.
     
  11. Carpediem44DB

    Carpediem44DB Well-Known Member GOLD Sponsor

    Aug 18, 2015
    Sanfransico Bay area
    2000 Carver 506
    2006 44 DB Sedan Bridge
    Volvo TAMD 74 P
    Well, judging from the pics you posted of your home remodel project, you get a pass:). Did the work get finished by the holidays like you were hoping?
     
  12. ttmott

    ttmott PhD in OCD TECHNICAL Contributor GOLD Sponsor

    Apr 3, 2012
    Space Coast Florida
    2006 52 Sedan Bridge
    Cummins QSM11
    Close; down to details but they pulled it off -
    I'll be able to get back to the boat this next week.
    IMG_6270.jpg
     
    Chris-380 and Nater Potater like this.
  13. Carpediem44DB

    Carpediem44DB Well-Known Member GOLD Sponsor

    Aug 18, 2015
    Sanfransico Bay area
    2000 Carver 506
    2006 44 DB Sedan Bridge
    Volvo TAMD 74 P
    Very nice!
    Time to get back to the Lift install or did that get finished?
     
  14. ocgrant

    ocgrant Official Bahamas Boating Ambassador

    Dec 31, 2006
    Miami / Ft Lauderdale
    H2O Therapy
    2006 Sundancer 48
    Novurania 430DL
    Yamaha EX-R
    PADI Divemaster
    Raymarine Electronics
    Cummins QSC 540's
    Wow. Looks awesome.
     
  15. ttmott

    ttmott PhD in OCD TECHNICAL Contributor GOLD Sponsor

    Apr 3, 2012
    Space Coast Florida
    2006 52 Sedan Bridge
    Cummins QSM11
    Yes back on the lift install.
     

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