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  1. J

    *Gen 3 Cool Fuel Module Issue*

    The sea water fittings have been modified but the Gen 3 cool fuel unit, to my knowledge, is still painted on the inside. I happened to look at the replacement unit before they installed it on my boat.
  2. J

    420DB – Bridge A/C and Heat Installation

    Good solution. A flexible feed line (double clamped) would also help eliminate vibration.
  3. J

    Dogs are the best people...

    Sincerest condolences... Dreading that day. "Near this Spot are deposited the Remains of one who possessed Beauty without Vanity, Strength without Insolence, Courage without Ferosity, and all the virtues of Man without his Vices."
  4. J

    Gen III Fuel Module Issues

    Here is a link showing all the serial numbers affected. http://www.marinemechanic.com/merc/distributors/mercurymarine/sterndrive/gen3fuelmoduletesting.PDF
  5. J

    Gen III Fuel Module Issues

    This problem has been documented multiple times here. If you are lucky the paint has not yet fouled the fuel rail and injectors. Doubtful since this problem is one that happens over a long period of run time and engine performance degrades slowly. By the time the problem is properly diagnosed...
  6. J

    2006 32 Sundancer with T 5.7 merc vdrives, enough power?

    I believe the OP's question concerns 5.7's, not 6.2's.
  7. J

    420DB – Bridge A/C and Heat Installation

    Sounds like a single pump for multiple units is more prevelant than initially thought. Alex, don't forget you'll need to add some relay logic to enable/disable that existing pump if you decide to utilize it with the new unit.
  8. J

    420DB – Bridge A/C and Heat Installation

    I think he was refering to comments like "how much pressure your hoses can take" and "blowing hoses all over the place" as well as "adds about 4 miles of 5/8" hose to the cooling circuit" You know, helpful educated comments like those. Oh, and my favorite "how long it'll take to fill the salon...
  9. J

    420DB – Bridge A/C and Heat Installation

    Besides the water in the lines picking up heat? Nothing. Just like the other tens of thousands of boats of all sizes with A/C where the seawater pump and part of the water tubing resides in the bilge. When the pump starts and cool seawater starts circulating that heat is quickly dissipated by...
  10. J

    420DB – Bridge A/C and Heat Installation

    Thousand ton open rooftop water towers have to deal with airborne debris, tons of pollen and other contaminants, bird droppings and solid pollutants that YOUR commercial unit does not. Marine environments are much cleaner by comparison. The factory installed seawater hose on your boat is just...
  11. J

    420DB – Bridge A/C and Heat Installation

    This is pure nonsense. At a flow rate of almost 2000 gallons per hour the sea water spends only a second or two in the confines of the engine room. Not nearly enough time to absorb any appreciable heat. By the way, these are not theories, but proven scientific and engineering facts that are...
  12. J

    420DB – Bridge A/C and Heat Installation

    Wow, so many experts and such little knowledge....This thread is filled with alarmists and misinformation. Pay attention, you may accidentally learn something.... Marine A/C, with the exception of some difference in piping materials used, is NO different in design and operation than commercial...
  13. J

    420DB – Bridge A/C and Heat Installation

    Electric resistance heat is more efficient by far and contains fewer moving parts making it far more reliable. Reverse cycle heat is limited in it's heating output as the entering water temp drops. The less heat the entering water contains the harder for the unit to extract it. Also with...
  14. J

    420DB – Bridge A/C and Heat Installation

    Is the Oceanbreeze unit inverter driven? If so that's the unit to use. These units use D.C. compressors and motors which use much less current to start and run putting less stress on your generator system and alleviating the problem of multiple A/C units running simultaneously. If it uses a...
  15. J

    Cruisair 1/2 ton A/C codes out HI PS on 1998 Sundancer 270 widerbeam

    THe fact that it takes so long to code out High Pressure indicates to me that you have a scale build up in your condenser coil which blocks heat transfer but not necessarily water flow. The fact that you see plenty of water flow through the hull fitting supports this. Feeling cool water coming...
  16. J

    420DB – Bridge A/C and Heat Installation

    Stay away from NU-22. It's cooling capacity is less than 85% of R-22's or R407C. To you that would mean considerably longer unit run time to do the same amount of cooling.
  17. J

    420DB – Bridge A/C and Heat Installation

    R410A and R407C are both HFC's and contain no free chlorine molecule (zero ozone depletion) which has been proven to be a contributor in destroying the earths ozone layer. Both refrigerants are "blends" and as such require special attention when filling or recharging systems. R407C's operating...
  18. J

    420DB – Bridge A/C and Heat Installation

    Alex, in a real engineered water cooled A/C system the pump is sized based on total tonnage at 3gpm/ton and resistance to flow due to elevation measured in ft of head. The pump is slightly oversized and items called circuit setters (adjustable restrictors) are installed at the units to insure...
  19. J

    420DB – Bridge A/C and Heat Installation

    Correct, 3GPM per Ton is the benchmark.
  20. J

    420DB – Bridge A/C and Heat Installation

    I think the "Turbo" with smart start you mentioned refers to an inverter driven units. These are more efficient because the compressor speed varies based on instantaneous load. These units use frequency drives to operate the compressors and fan motors only at the capacity needed. This technology...
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