Cruisers Forum
 


Join CruisersForum Today

Reply
 
Thread Tools Rate Thread Display Modes
Old 30-01-2016, 06:36   #1
Registered User

Join Date: Jan 2016
Posts: 6
Marine a/c water pump

We are replacing our marine a/c water pump which is 320gph. We are looking at a pump that is 300gph & a pump that is 500gph. We do not know if the pump we are replacing is the original one. Our question is should we go with the 300 or 500?
__________________

__________________
BobandJoann is offline   Reply With Quote
Old 30-01-2016, 06:48   #2
Registered User
 
jstevens's Avatar

Join Date: May 2006
Location: On board Sarah, currently lying in Jacksonville, FL
Boat: Pearson, 424, 42', Sarah
Posts: 582
Images: 4
Re: Marine a/c water pump

The answer is in the A/C unit the pump is servicing. As long as the water requirement for the A/C is below 300 gph you should be OK. 500 gph sounds like a major over kill. There have to be other options.
The water flow requirements for the A/C should be stamped on the manufacturer plate or in the documentation, which is likely available online. Better yet call or email the A/C manufacturer and get their recommendation.

John
__________________

__________________
jstevens is offline   Reply With Quote
Old 30-01-2016, 07:04   #3
Registered User

Join Date: Jan 2016
Posts: 6
Re: Marine a/c water pump

Unfortunately the company that made the a/c unit is out of business. There is nothing in the literature and nothing stamped on the manufacturer plate.
__________________
BobandJoann is offline   Reply With Quote
Old 30-01-2016, 07:07   #4
Moderator Emeritus
 
GordMay's Avatar

Join Date: Mar 2003
Location: Thunder Bay, Ontario - 48-29N x 89-20W
Boat: (Cruiser Living On Dirt)
Posts: 31,583
Images: 240
Re: Marine a/c water pump

What is the make, model, and BTU/H capacity of the AC?
__________________
Gord May
"If you didn't have the time or money to do it right in the first place, when will you get the time/$ to fix it?"



GordMay is offline   Reply With Quote
Old 30-01-2016, 07:28   #5
Registered User

Join Date: Jan 2016
Posts: 6
Re: Marine a/c water pump

The make is Polar Bay Air, the model is SLW10DH-1 and 10,000 BTU.
__________________
BobandJoann is offline   Reply With Quote
Old 30-01-2016, 07:30   #6
Moderator
 
a64pilot's Avatar

Cruisers Forum Supporter

Join Date: Oct 2013
Location: Albany Ga.
Boat: Island Packet 38
Posts: 17,056
Re: Marine a/c water pump

10K is actually pretty small, I'd bet your fine at 300.



Sent from my iPad Pro using Cruisers Sailing Forum
__________________
a64pilot is offline   Reply With Quote
Old 30-01-2016, 07:44   #7
Registered User

Join Date: Jan 2016
Posts: 6
Re: Marine a/c water pump

Thank you to all who replied to my question. Your response is appreciated!
__________________
BobandJoann is offline   Reply With Quote
Old 30-01-2016, 08:25   #8
Registered User

Join Date: Jun 2007
Location: Charleston, SC
Boat: Endeavour 42 CC Katash
Posts: 61
Re: Marine a/c water pump

I have a brand new 400 gph pump manuf. by Little Giant, above the water line type that I bought for a dual system and it wasn't big enough. I replaced it with a 600 gph pump of same module.
Paid $270.00 for it and will take $150.00 plus freight. If interested email pwmullins@aol.com
__________________
pwmullins is offline   Reply With Quote
Old 30-01-2016, 08:32   #9
Registered User

Join Date: Feb 2015
Posts: 413
Re: Marine a/c water pump

March LC pumps are best. Mine has been running daily for 2 years with 0 issues.
__________________
sailnow2011 is offline   Reply With Quote
Old 30-01-2016, 08:59   #10
Registered User

Join Date: Jan 2016
Posts: 6
Re: Marine a/c water pump

We have decided to go with March 300gph.
__________________
BobandJoann is offline   Reply With Quote
Old 30-01-2016, 09:14   #11
Registered User

Join Date: Apr 2015
Location: UPSTATE NY
Boat: Cape Dory 27D
Posts: 62
Images: 2
Re: Marine a/c water pump

Quote:
Originally Posted by BobandJoann View Post
We are replacing our marine a/c water pump which is 320gph. We are looking at a pump that is 300gph & a pump that is 500gph. We do not know if the pump we are replacing is the original one. Our question is should we go with the 300 or 500?
Original systems are generously configured with expected high parameters as performance standards, IE temperature high in cabin and and high water temp. Since the average real world usage is far below the extreme that the system may occasionally face, the downsize from 320 to 300 should have little to no adverse effect on the overall performance. I would opt for the 300 gph.
__________________
MCOS is offline   Reply With Quote
Old 30-01-2016, 09:21   #12
Registered User

Join Date: Feb 2015
Posts: 413
Re: Marine a/c water pump

The only issue with 300gph is if you have a long run, or put in any elbows, flow will suffer. Better to be too high flow then too low.
__________________
sailnow2011 is offline   Reply With Quote
Old 30-01-2016, 09:35   #13
Registered User

Join Date: Jan 2016
Posts: 6
Re: Marine a/c water pump

Quote:
Originally Posted by MCOS View Post
Original systems are generously configured with expected high parameters as performance standards, IE temperature high in cabin and and high water temp. Since the average real world usage is far below the extreme that the system may occasionally face, the downsize from 320 to 300 should have little to no adverse effect on the overall performance. I would opt for the 300 gph.
Thank you!
__________________
BobandJoann is offline   Reply With Quote
Old 30-01-2016, 10:48   #14
cruiser

Join Date: Jan 2012
Location: Lake Ontario
Boat: Douglas 32 Mk II
Posts: 1,923
Re: Marine a/c water pump

Quote:
Originally Posted by BobandJoann View Post
We are replacing our marine a/c water pump which is 320gph. We are looking at a pump that is 300gph & a pump that is 500gph. We do not know if the pump we are replacing is the original one. Our question is should we go with the 300 or 500?

All pump ratings are based on open discharge at rated voltage. The actual output will vary greatly depending on system head loss (caused by flow resistance and lift requirements), as well as actual voltage.

The original system was designed with these considerations in mind, and there was a good margin of safety built in, to allow for these variations.

Depending on the system, the actual flow of the original may be only 150 GPH and the replacement 148 GPH (for example), depending also on the shape of the pump curves.

This variation may be equal to like a 0.25 Vac drop in supply voltage.

For all of these reasons, if the 320 GPH pump worked fine, I'm 99% sure the 300 GPH pump will as well.

Disclosure: I sell and install Marine Air Conditioning systems. The post is offered as free advice and is not intended to solicit business.

Ramblin Rod
Marine Service Provider
About Sheen Marine
__________________
ramblinrod is offline   Reply With Quote
Old 30-01-2016, 19:28   #15
Registered User

Join Date: Aug 2011
Location: Oviedo Florida
Boat: 55 fleming
Posts: 102
Re: Marine a/c water pump

With A/C other things being equal bigger is better. The bigger pump will have higher pressure if the hose diameter is the same.
__________________

__________________
wesevans is offline   Reply With Quote
Reply

Tags
marine, water

Thread Tools
Display Modes Rate This Thread
Rate This Thread:

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
Pump, Pump, No Pump ...Repeat and ...Die Capn Bri Plumbing Systems and Fixtures 17 23-12-2015 22:46
For Sale: PAR Electric System Water Pump and JABSCO Electric Bilge Pump hanks Classifieds Archive 3 05-03-2014 20:03
For Sale: Jabsco 31600-0092 Marine ParMax 3 High Pressure Water System Pump loved cruising Classifieds Archive 0 11-09-2013 16:35
For Sale: Brand New Whale AP0816 Agri-Pump 12VDC Water Pressure Sprayer Pump v62cobra Classifieds Archive 0 15-12-2012 11:41
Raw Water Pump vs Fresh Water Pump Cheechako Engines and Propulsion Systems 44 01-02-2012 15:31



Copyright 2002- Social Knowledge, LLC All Rights Reserved.

All times are GMT -7. The time now is 02:54.


Google+
Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2017, vBulletin Solutions, Inc.
Social Knowledge Networks
Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2017, vBulletin Solutions, Inc.

ShowCase vBulletin Plugins by Drive Thru Online, Inc.