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post #1 of 6 Old 10-18-2002 Thread Starter
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revervse air

did some math even followed the guidelines for the calculations for btu''s needed for my boat I come up with 24000 btu''s. Seems a little much since the largest seems to be 16000 I have a 35 foot boat with 10 ft beam an about six feet of vertical space down below what if anything am I doing wrong since the manufacturers are claiming that the 16 will be enough for 35 to 40 ft boats ant help appreciated thanks
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post #2 of 6 Old 10-18-2002
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revervse air

Ken, I concur that the computations are way off. Your boat should be using a 12,000 or 16,500 BTU unit depending on several variables.

FWIW as a benchmark, our 42'' x 13'' Pearson 424 has a 16,500 reverse cycle unit and is used when we''re in the Tampa Bay area. We also used it for a summer (storm) season in Trinidad. Both these locations put a high demand on the unit, which is frankly marginal in capacity for such volume and heat. However, we use awnings when dockside in hot weather and find it makes it possible for the unit to maintain an average 80 degree temp with cycling about 60% daytime and far less at night (ambient of an average 90 daytime, 80 night). Hopefully, that data point will help you a bit.

Your unit''s performance will depend on use of awnings, ambient conditions, amount of boat insulation, injection temp (or temp of water in which boat is sitting) and other variables (how willing the crew is to listen to the unit running; how frequently you are coming & going, admiting hot/humid air, etc.).

And FWIW, our unit is a rotary Mermaid Marine unit that''s now 6+ years old. The folks are terrific to work with, we just did a total refurb on the unit at their factory (we''re nearby) where we learned that the cause of our eventual freon loss (metal condensing coil which rusted out) has been replaced by a copper coil 1/3 the size but with more efficiency. The refurb cost us 1 day ''layover'' at the factory and $165, terrific value for a unit that now looks brand new. But the folks running the business (it recently changed hands) are super, even better than the previous owners tho'' I thought that would be impossible.

Jack
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post #3 of 6 Old 10-18-2002 Thread Starter
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revervse air

thanks knew it was too much but needed the practical to prove it I''m in the chesepeake bay
once again thanks for conformation does mermaid have a web site or a local distributor in the bay area?
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post #4 of 6 Old 10-18-2002
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revervse air

Ken:

You''ll find Mermaid Marine at http://www.mmair.com/. Their 800# is also available to learn more about local reps, altho'' we relied on phone coaching when installing our system and found it dead simple. Only the AC wiring might be best done by someone who knows how.

I guess it''s somewhat of a commentary on cruising in the 21st century but, when we found we''d lost the freon in our system, we discovered we could email a reservation for repair service in Chaguaramas Bay, Trinidad before our arrival. Geesh, so much for getting away from it all!

Jack
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post #5 of 6 Old 10-18-2002
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revervse air

Jack,
did we discuss your e-mail system?
fair winds,
eric
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post #6 of 6 Old 10-19-2002
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revervse air

Ken
Yes, when one tries to theoretically
size a unit one will always come up with a large BTU requirement. I live on a Tayana 37 in Baltimore, And I recently installed a 12,000 BTU Cruise air. I have no problem in the summer nor Winter. Naturally an awning will go a long way to reduce requirements.
Incidentaly. Taylor made bought out ; Cruise air, Mermaid and Grunnert.Mermaid is the `economical uint. I would spend the extra dollars and go with the 12,ooo Cruise air. Talk to the Cruise air folks in Annapolis, they sell all the units.
Joe
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