Cruisers Forum

Join CruisersForum Today

Thread Tools Rate Thread Display Modes
Old 25-01-2010, 09:59   #1
Registered User
svHyLyte's Avatar

Join Date: Mar 2006
Location: Tampa Bay area, USA
Boat: Beneteau First 42
Posts: 2,969
Images: 25
Cleaning A/C Raw Water / Heat Exchanger Lines

This past weekend I started doing the annual maintenance on our reverse cycle 16,000 BTU A/C unit but I came up against something new.

Because our little marina is a few miles up-river of Tampa Bay, there is a good bit of silt in suspension in the water. This normally results in an accumulation of material in the raw water feed lines and heat exchange coil that must be back-flushed out periodically--usually a time consuming but not complicated job. In past I have been able to simply connect up a garden hose to the discharge line and run a temporary line from the in-put side of the coil to a 5 gallon bucket and blast out a substantial amount of debris. Once the water runs clear, I introduce a 10% acid mix to the coil and let that sit for awhile to dissolve any scale that may have built up on the inside of the coil and then rinse that out. The foregoing treatment normally increases raw-water through-put markedly and the system--on heat or cooling--works noticeably better.

Upon removing the in-put lines this past weekend, I discovered the inside surfaces were coated with a thick oily material which I attribute to the fact that we've had a large influx of power boats in our basin and, accordingly, many instances of fuel, oil and/or worse being dumped in the water during the last year. In any case, this coating was difficult to remove from the lines I had in hand, and, in fact, could not be removed until I ran some "Goo-Gone", a Citrus Oil based cleaner, through the lines followed by hot water and then a swab of cotton. Undoubtedly, this coating extends throughout the system and A/C coils, and if not thoroughly removed, may increase the rate of the obstruction of the coils. I am also concerned that this coating will prevent an acid wash reaching the scale and what-not that may have built up on the inside of the coil.

The question is then, what is the best way to remove this coating given that I canít run a wad of cotton through the entire system. Any suggestions or recommendations will be appreciated.

s/v HyLyte
"It is not so much for its beauty that the Sea makes a claim upon men's hearts, as for that subtle something, that quality of air, that emanation from the waves, that so wonderfully renews a weary spirit."
svHyLyte is offline   Reply With Quote

heat exchanger, raw 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
Cleaning Perkins Heat Exchanger Trekka Engines and Propulsion Systems 8 04-09-2012 13:33
Salt Water Mixing w/Coolant, Heat Exchanger Michael Jones Engines and Propulsion Systems 2 14-11-2009 19:32
Cleaning A Heat Exchanger stormsurf Engines and Propulsion Systems 3 18-06-2009 07:41
Heat exchanger Chrisc Engines and Propulsion Systems 3 17-12-2008 21:57
cleaning heat exchanger AnotherSailorman Engines and Propulsion Systems 10 24-05-2005 18:30

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 23:47.

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.