Reply
 
Thread Tools Search this Thread Display Modes
 
Old 05-09-2019, 11:10 AM   #1
Guru
 
hmason's Avatar
 
City: Stuart FL
Country: USA
Vessel Name: Magic
Vessel Model: Grand Banks 46 Europa
Join Date: Aug 2013
Posts: 2,235
A/C Finally Fixed

When we purchased Magic 7-years ago the forward air conditioner raw water output appeared slower than the other two units (separate outputs, one raw water pump). The surveyor did not call this to our attention and it wasn't noticed for awhile. I thought it was normal for the most distant from the pump of 3 overboard discharges to run slower than the other two. Over time it got slower and slower.

An A/C repair company was called in to fix the issue as the output became just a dribble of water and we needed to shut down the forward (master stateroom) A/C.

The first repair attempt was to blow out the hose to the unit with compressed nitrogen. This fixed the problem---temporarily. Within about a week the problem reappeared.

The next attempt was to circulate Barnacle Buster through the system. Again, it worked---temporarily.

Next we replaced all the raw water A/C hoses from the sea strainer to all the units. Hooray, that worked---temporarily.

I theorized that the seawater pump which was 23 years old should be replaced. The line was blown out again and the pump replaced with an Oberdorfer 1/3 hp pump. Well, guess what, that worked--temporarily.

Spoiler Alert; If you want to try to figure out the ultimate solution on your own, read no further. If you want the answer just scroll down a bit.






With the A/C company blowing out the lines yet again, I decided to crawl under the cabinet in the forward head to work the ball valve for the discharge line back and forth a few times in case there were barnacles or other debris caught in it. I rotated the handle a few times but felt no resistance. We removed the ball valve and discovered that the handle had broken free of the ball in the valve leaving the valve only about 1/3 opened. And, the opening was clogged with debris that couldn't fit thru the restricted opening. This explained everything. The valve was replaced and for the first time we have full water flow. I also have all new hoses, a new pump and a bunch of receipts. And so it goes!
__________________
Advertisement

__________________
Howard
Magic, 1996 Grand Banks Europa
Westport, CT and Stuart, FL
hmason is offline   Reply With Quote
Old 05-09-2019, 11:32 AM   #2
Enigma
 
RT Firefly's Avatar
 
City: Slicker?
Country: Bumpkin?
Join Date: Oct 2007
Posts: 12,518
Greetings,
Mr. hm. Cool!


__________________

__________________
RTF
RT Firefly is online now   Reply With Quote
Old 05-09-2019, 02:16 PM   #3
Guru
 
hmason's Avatar
 
City: Stuart FL
Country: USA
Vessel Name: Magic
Vessel Model: Grand Banks 46 Europa
Join Date: Aug 2013
Posts: 2,235
Thanks RT. Finally some cool without a price tag.
__________________
Howard
Magic, 1996 Grand Banks Europa
Westport, CT and Stuart, FL
hmason is offline   Reply With Quote
Old 05-09-2019, 04:18 PM   #4
Senior Member
 
sum escape's Avatar
 
City: Muskegon, MI
Country: Cruising
Vessel Name: Sum Escape
Vessel Model: Grand Banks 47' Europa
Join Date: Jun 2014
Posts: 187
Similar story in 2016. Forward sump was not discharging. Could blow a water hose through the hoses fine. But pump would blow circuit breaker. Crawled into 18" square floor access and made like a pretzel for an hour replacing Gulper pump. Test with float and presto, discharge. OK Dear, I'm going to take a shower. When done with shower, water again in bilge and blown circuit breaker. Any guesses? OK scroll down...




Traced discharge line finding it pinched by factory in 2006!. Could not even get it out from pinch point. Cut it on both sides of crimp point and routed a bypass hose connecting the ends of the original. Problem solved. Well at least a new pump is installed now!
sum escape is offline   Reply With Quote
Old 05-10-2019, 01:10 PM   #5
Senior Member
 
City: tallahassee
Country: United States
Vessel Model: 1979 Mainship 34
Join Date: Aug 2016
Posts: 382
This is why I wont go to a water cooled system. I hate the noise of my rooftop a/c but it blows very cold and does an amazing job over the years.

When I decide to "fix" it i'm going to install a Mini split Inverter system.
Mrwesson is online now   Reply With Quote
Reply

Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

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





All times are GMT -5. The time now is 02:39 PM.


Powered by vBulletin® Version 3.8.8 Beta 4
Copyright ©2000 - 2019, vBulletin Solutions, Inc.
Search Engine Optimization by vBSEO 3.6.0
Copyright 2006 - 2012