Cruisers Forum

Join CruisersForum Today

Thread Tools Rate Thread Display Modes
Old 09-05-2007, 09:47   #1
Registered User
markpj23's Avatar

Join Date: Nov 2005
Location: Black Hills, SD
Boat: Now Boatless
Posts: 1,148
Images: 47
Proven Again - H2O & Electrons Don't Mix

As a network guy I always try to determine root cause of a problem, lest it come back to haunt me later in life. Y'all may have seen my smoke-tested A/C unit controller in another thread.

Now for Root Cause:
When we got back to the boat I noticed that the broker had shut down nearly all of the 12V switches on the panel. Didn't think much of it as I fired things up again. I also confirmed that the FWD A/C was tripping the breaker immediately, as he had told me.

Ran through my standard checks - bilge pumps working, no water where it shouldn't be etc. Switched on the shower drain sumps and the FWD pump ran for a bit longer than normal. Didn't think much of it.

Next day I started to tackle the FWD A/C unit problem. Visual inspection seemed normal. That's when I started my successful smoke test of the logic board.

Yesterday as I removed the old unit, I noticed the rusty bath tub ring around it. Hmm, dry under the berth where it is, no issue there. Then it hit me.... The condensate drain is routed to the FWD shower sump - which had of course been switched off.

The logic board is mounted outside of the drain pan, but the compressor wiring lays in the pan and is probably the reason for all the smoke. I won't know for sure until I can bench test it during the refurb. It did run (apparently) normally just prior to the smoke coming out.

Lesson Learned: Running the condensate drain to the shower sump IS a good idea. BUT you should have an "overflow" exit hole at the right level in the pan so that water can spillover into the bilge as a last resort. A wet bilge is less expensive than a wet A/C unit.....

markpj23 is offline   Reply With Quote
Old 09-05-2007, 10:22   #2
Senior Cruiser
Lancerbye's Avatar

Cruisers Forum Supporter

Join Date: Mar 2007
Location: Anchored somewhere in the Canadian Gulf Islands, East of Vancouver Island
Boat: Lancer 44 Motorsailer
Posts: 1,710
Images: 32
Too bad about your A/C , However H2O is not the problem because pure distilled H2O does not conduct electricity well. The conductivity increases as the mineral content increases. So blame the bloody salt. It works for me. Plus all the other trace elemts found in water.
Lancerbye is offline   Reply With Quote
Old 09-05-2007, 13:16   #3

Cruisers Forum Supporter

Join Date: Apr 2006
Posts: 12,077
Can't blame the salt. You can stick wires in salt piles all day long, and without the water there's no problem.<G>
hellosailor is offline   Reply With Quote

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

Our Communities

Our communities encompass many different hobbies and interests, but each one is built on friendly, intelligent membership.

» More about our Communities

Automotive Communities

Our Automotive communities encompass many different makes and models. From U.S. domestics to European Saloons.

» More about our Automotive Communities

Marine Communities

Our Marine websites focus on Cruising and Sailing Vessels, including forums and the largest cruising Wiki project on the web today.

» More about our Marine Communities

Copyright 2002-2015 Social Knowledge, LLC All Rights Reserved.

All times are GMT -7. The time now is 18:38.

Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2016, vBulletin Solutions, Inc.
Social Knowledge Networks
Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2016, vBulletin Solutions, Inc.

ShowCase vBulletin Plugins by Drive Thru Online, Inc.