Cruisers Forum
 


Join CruisersForum Today

Reply
  This discussion is proudly sponsored by:
Please support our sponsors and let them know you heard about their products on Cruisers Forums. Advertise Here
 
Thread Tools Search this Thread Rate Thread Display Modes
Old 24-11-2014, 08:39   #1
Registered User
 
Ndavies's Avatar

Join Date: Sep 2012
Location: On the Ocean
Boat: Hunter 42 Passage and Lagoon 40
Posts: 213
Images: 3
Flushing HVAC System

I have 2 HVAC systems on my Hunter 42 Passage. Both systems use a common pump to circulate water through the heat exchangers. The water running through my rear unit (Cruiseair) has slowed down considerably compared to its normal flow and compared to the flow from the front unit. I have disconnected the piping at the pump and "blown it out" using a garden hose (I get a good flow rate with the hose connected only to the rear unit). I have also tried flushing the piping using vinegar (A mild acid). These actions have removed some visible sludge and debris but the flow rate is still not normal. I have checked and replaced the circulation pump impeller, cleaned screens etc. Does anyone have suggestions as to the next step?

Thanks
Neil
S/V Midnight Sun II
www.midnightsunii.com
S/V Midnight Sun II
__________________

Ndavies is offline   Reply With Quote
Old 24-11-2014, 09:08   #2
Moderator
 
a64pilot's Avatar

Cruisers Forum Supporter

Join Date: Oct 2013
Location: Albany Ga.
Boat: Island Packet 38
Posts: 27,994
Re: Flushing HVAC System

Go to Lowes and buy a Gl of pool acid, also used to clean concrete, Muratic acid.
flush out the AC unit with this. Most recommend about a 25% solution. Be careful with this stuff and Google flushing marine AC with Muratic acid and you'll get a lot to read.
__________________

a64pilot is online now   Reply With Quote
Old 25-11-2014, 18:33   #3
Registered User
 
CS Cruiser's Avatar

Join Date: Mar 2013
Location: PCYC Toronto
Boat: CS36T
Posts: 318
Images: 12
Re: Flushing HVAC System

Get a gallon of Rydlyme, much safer in all aspects of handling, enviroment, and safe for Hx's
__________________
Paul
s/v TENACITY - CS36T
CS Cruiser is offline   Reply With Quote
Old 06-12-2014, 13:29   #4
Registered User

Join Date: May 2011
Location: New Smyrna Beach, Fl
Posts: 112
Re: Flushing HVAC System

I have used Rydlyme and muratic acid and found the muratic acid to clean better but it is definitely more dangerous. Just be extremely careful. Don't use over 25% acid strength. 1/4 acid to water. I pump it through the ac units for about an hour or two using a small 500gph bilge pump in a 5 gal bucket.
C Skip R is offline   Reply With Quote
Old 06-12-2014, 16:21   #5
Registered User
 
Whitebread117's Avatar

Join Date: Sep 2014
Posts: 104
Re: Flushing HVAC System

PLEASE if you decide to use muriatic (or any strong acid), when diluting add the acid to the water rather than water to the acid. Whatever bucket you are using for mixing, put the water component in first then pour in the acid and blend smoothly (wooden paint stir works well). DO NOT add the acid first and then pour the water on top - a splash due to a bit of overzealous water pouring will result in nearly pure acid being splashed back up onto the person doing the pouring.

As someone with professional experience with (industrial) heat exchangers, muriatic acid is excellent for the proposed task. Just don't treat it lightly, it's much stronger than your average household cleaner.
__________________
<Insert Heavy Sarcasm Here>
Whitebread117 is offline   Reply With Quote
Old 06-12-2014, 16:57   #6
Registered User
 
Wench'sCaptain's Avatar

Join Date: Oct 2011
Location: On the Boat
Boat: Hunter Helsen 470
Posts: 132
Re: Flushing HVAC System

Several Bromine tabs in the strainer is what I and a few friends have used successfully.
Wench'sCaptain is offline   Reply With Quote
Old 07-12-2014, 17:29   #7
Registered User
 
Ndavies's Avatar

Join Date: Sep 2012
Location: On the Ocean
Boat: Hunter 42 Passage and Lagoon 40
Posts: 213
Images: 3
Re: Flushing HVAC System

Thanks all or the advice and suggestions. I think I will carefully try the muriatic acid as vinegar and the pressure of a garden hose has failed to remove whatever crud is causing the problem. I had not thought about circulating it with a pump - my flushes have been "once through" to date - so I will try that.

Cheers!
Neil
S/V Midnight Sun II
S/V Midnight Sun II
__________________

Ndavies is offline   Reply With Quote
Reply

Tags
flushing, hvac

Thread Tools Search this Thread
Search this Thread:

Advanced Search
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
flushing fresh water cooling system on W-46 westerbeke rlg Engines and Propulsion Systems 5 26-03-2014 17:00
HVAC/R as Income Generator While Cruising 1gypsy Boat Ownership & Making a Living 8 28-12-2009 06:57
Refrigeration / HVAC toewsrus Boat Ownership & Making a Living 2 30-07-2007 12:28
Raw (Seawater) Strainers for HVAC etc. use donw_s11 Plumbing Systems and Fixtures 12 16-05-2007 17:49
Where can I find HVAC?? joneswilliams Off Topic Forum 2 07-06-2006 01:10

Advertise Here


Copyright 2002- Social Knowledge, LLC All Rights Reserved.

All times are GMT -7. The time now is 08:54.


Google+
Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2019, vBulletin Solutions, Inc.
Social Knowledge Networks
Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2019, vBulletin Solutions, Inc.
×

ShowCase vBulletin Plugins by Drive Thru Online, Inc.