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Old 02-17-2017, 05:23 PM   #1
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Ugh! Yet another air conditioner ?

I have two air conditioners on board, forward and aft. Forward is a Marine Aire and aft is a cruise aire. BOTH are 16,000 btu's. The Marine Aire's sea water pump is no longer viable. It was 1000 gallons per hour. The cruise Aire's pump is 500 gallons per hour.

Ok, here is the question. May I replace the Marine Aire's 1000 gallon per hour pump with a 500 gallon per hour pump? If so, what is the difference? Everything I have researched says 500 gallon per hour is good for a 16,000 btu. Thoughts? Suggestions?
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Old 02-17-2017, 06:13 PM   #2
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If so, what is the difference?
500 gallons per hour?

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Old 02-17-2017, 06:22 PM   #3
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Old 02-17-2017, 06:25 PM   #4
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Yeah I am feeling like a genius, but really it was a tough mathematical challenge!
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Old 02-17-2017, 06:35 PM   #5
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Check with the manufacturer but we run 2-16K units on one ~1000 gph pump so maybe yes?

On a side note I've been told that too much flow can decrease the life of the unit.
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Old 02-17-2017, 06:45 PM   #6
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Check with the manufacturer but we run 2-16K units on one ~1000 gph pump so maybe yes?

On a side note I've been told that too much flow can decrease the life of the unit.
Hey Larry please don't try to hijack this mathematical challenge with some misleading information, I won!
Ok ok I am out
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Old 02-17-2017, 06:54 PM   #7
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it actually *is* a hard math problem, delta T and surface area of coils and so on. That being said, even 8GPM can carry a **BOATLOAD** of BTU's away.
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Old 02-17-2017, 07:02 PM   #8
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I have 2 Marine Airr units a 16,000 & a 12,000, they both operate perfectly well with one 1000 gah March pump.
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Old 02-17-2017, 07:42 PM   #9
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Donna,
There's more to the math than meets the eye. A 500 GPH pump doesn't reflect head (easy wifey B ) or frictional line loss. Simply, pushing water up and through plumbing creates resistance and reduces flow (GPH). So, a pump rated for 500 GPH that lifts the water 5' above sea level and through 50' of plumbing and the AC condenser might only be delivering 300 GPH. If you want to know what is required, you might start by running the other AC water pump, put a 5 gallon bucket under the outlet, measure how many seconds it takes to fill the bucket, and then do the math to figure out GPH. In general higher volume centerfucial pumps feeding multiple AC units lose less volume as a result of head or frictional line loss.

My guess is that you will find a measured output of 250 GPH (4 GPM) will be enough.

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Old 02-17-2017, 07:46 PM   #10
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500 gph pump should be fine on a 16000 btu air conditioner. I recommend a March LC-3CP-MD. Marine Aire sells it as their P500.
I think my old company has a pretty good price on it.
March LC-3CP-MD Magnetic Drive Pump
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Old 02-17-2017, 07:50 PM   #11
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Then what does GPH and GPM stand for?
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Old 02-17-2017, 07:52 PM   #12
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Hours/Minutes..
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Old 02-17-2017, 07:55 PM   #13
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Thank you OC Diver for the explanation. I'm doing my best here.
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Old 02-17-2017, 07:59 PM   #14
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Hours/Minutes..
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Old 02-17-2017, 08:05 PM   #15
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Thank you OC Diver for the explanation. I'm doing my best here.
Sorry I think our fellow OC diver is trying to get credit by throwing numbers and confusing explanations to a challenge that as already been solved.
I gave you numbers and our famous Mr RT gave units, you should be able to resolve the equation by yourself
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Old 02-17-2017, 08:26 PM   #16
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Sorry I think our fellow OC diver is trying to get credit by throwing numbers and confusing explanations to a challenge that as already been solved.
I gave you numbers and our famous Mr RT gave units, you should be able to resolve the equation by yourself
You are right, I should have been. It has been a bad couple of weeks. Working way more than usual, Mother broke her hip, daughter got engaged, had to figure out what was going on with a/c, needed new tires on the car, so life got in the way. Sorry for the stupid question.
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Old 02-17-2017, 08:34 PM   #17
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WHAT? Daughter got engaged without my blessing??? PFFF
Sorry for mother hip and being a fool
Everything else than mother and daughter is just detail, you don't need ac, just think that I have 7 feet of snow in front of my house and you will feel better
And for new tires... Who need tires when living aboard!!!
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Old 02-17-2017, 08:51 PM   #18
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Sorry I think our fellow OC diver is trying to get credit by throwing numbers and confusing explanations to a challenge that as already been solved.
I gave you numbers and our famous Mr RT gave units, you should be able to resolve the equation by yourself
Some may want to understand why a 500 GPH rated pump doesn't produce that volume going through an AC system. The same pump and AC unit that works in one installation may not work in another because of head pressure and frictional line loss. Sorry if you missed that point or don't understand that people who design these installations, plan around these parameters.

Ted
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Old 02-17-2017, 09:24 PM   #19
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Some may want to understand why a 500 GPH rated pump doesn't produce that volume going through an AC system. The same pump and AC unit that works in one installation may not work in another because of head pressure and frictional line loss. Sorry if you missed that point or don't understand that people who design these installations, plan around these parameters.

Ted
Some may want to understand (maybe you) that I was just jocking
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Old 02-17-2017, 09:42 PM   #20
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Some may want to understand (maybe you) that I was just jocking
Sorry, I didn't realize you were joking regarding my explanation.

Ted
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