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Old 01-30-2011, 09:18 AM   #21
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RE: HVAC frozen up (literally!)

Quote:
Shoalwaters wrote:

Woodsong,
You could try posting your question here:
http://marine-ac.com/forum/
It's a small free forum run by a professional HVAC guy who seems to enjoy answering novice*a/c questions. He was very patient and helpful with mine.
Hello Everyone...Yes that's me in the link...Thanks to both that posted about me & my site...I do try to help for free in hopes that some might Consider buying from me if you like my advise or help...Nothing more...

As far as reverse cycle heat...You should not run the system with any lower than 40 degree seawater...It will ice up as shown...


The worst part is the ice can rupture that water coil, and that usually ruins the rest of the unit/system due to water getting into the freon circuit, and then shorting out the compressor...


The risks of this are less with digital controls but if your system has been retrofitted to digital you would need to know if a low pressure switch was installed with the retrofit...Most manual knob controlled units did not come with one, and if it did, did the installer wire it to the new digital control...


Here is a link to a icing in heat thread in my forum*http://marine-ac.com/forum/troublesh...arch=2&ret=all


I just did a search & came up with 50 related posts




Steve~*

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Old 01-30-2011, 09:56 AM   #22
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RE: HVAC frozen up (literally!)

Steve- Great Forum- Lots of interesting Threads and Advice.* Keep up the good work!* JohnP
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Old 01-30-2011, 06:04 PM   #23
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HVAC frozen up (literally!)

Steve,
Thanks for hopping over here and hope you stick around here on TF! regarding my particular issue, both the HVAC unit and the digital controls are fairly new...probably 3-4 years at most. We just got home from the weekend on the boat. It ran fine all weekend and heated great so hopefully no damage was done!A question for you if I may though....I talked on the phone with the local marine HVAC guy the other day and he made the comment that we should not leave any of the units on in the winter as he had seen a couple of boats in the recent past that almost sank as a result of the unit icing over and something happening. *I didn't ask enough questions to determine what reportedly caused the near sinkings but, big picture, if I leave one of my cruise air reverse cycle HVAC units on for a week or two and it freezes up, will I be in risk of it resulting in lots of water and possible sinking of the boat? *Will it damage the unit to run iced over?


Thanks!!


-- Edited by Woodsong on Sunday 30th of January 2011 07:06:59 PM
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Old 01-30-2011, 06:36 PM   #24
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RE: HVAC frozen up (literally!)

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Woodsong wrote:

Steve,
Thanks for hopping over here and hope you stick around here on TF! regarding my particular issue, both the HVAC unit and the digital controls are fairly new...probably 3-4 years at most. We just got home from the weekend on the boat. It ran fine all weekend and heated great so hopefully no damage was done!
A question for you if I may though....I talked on the phone with the local marine HVAC guy the other day and he made the comment that we should not leave any of the units on in the winter as he had seen a couple of boats in the recent past that almost sank as a result of the unit icing over and something happening. *I didn't ask enough questions to determine what reportedly caused the near sinkings but, big picture, if I leave one of my cruise air reverse cycle HVAC units on for a week or two and it freezes up, will I be in risk of it resulting in lots of water and possible sinking of the boat? *Will it damage the unit to run iced over?


Thanks!!


-- Edited by Woodsong on Sunday 30th of January 2011 07:06:59 PM
*
Here's a repeat & quote...

Cruisair/Marine Air say's ...Under no conditions should you run our systems in heat mode with less than 40 degree F water....


"The worst part is the ice can rupture that water coil, and that usually ruins the rest of the unit/system due to water getting into the freon circuit, and then shorting out the compressor..."


If it can rupture a cupronickel. coil internally, I'm sure it could rupture externally...I just can't say I've seen it being here in central Fl with water temps always above 55 degrees...


Steve~

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Old 01-30-2011, 06:50 PM   #25
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HVAC frozen up (literally!)

What the deal here folks is...That water coil runs much colder than the water that runs thru it...40 degree & below water may cause that coil to run as low as 22-32 degrees...

It will surely freeze solid...But the less than freezing water before it, will still try to pump....


Steve~



-- Edited by spcoolin on Monday 31st of January 2011 04:33:56 AM
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Old 02-01-2011, 07:27 AM   #26
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RE: HVAC frozen up (literally!)

Some marine AC units have optional electrical resistance heating that is controlled by the AC system thermostat. This might be a good option for people in colder climates who keep their boats in the water.
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Old 02-03-2011, 05:25 AM   #27
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RE: HVAC frozen up (literally!)

Yep, I agree with David. Your "cooling" water is probably too cold
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Old 02-07-2011, 12:05 AM   #28
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RE: HVAC frozen up (literally!)

You might also try Kollman at this:

http://www.kollmann-marine.com/


He too runs a forum and I've run across hime on a couple other sites and he seems to be helpfull.
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Old 02-11-2011, 08:57 AM   #29
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RE: HVAC frozen up (literally!)

We have two Ocean Breze Units with resistance heat. They work great in the winter (at least here in north Florida)*without worying about water temperature. Also saves the AC pump running.
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Old 02-11-2011, 08:12 PM   #30
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RE: HVAC frozen up (literally!)

I keep a heater in the bilge to keep the Perkins toasty, but why does the rest of the boat need to be kept warm in the winter?* Maybe to keep the FW pipes from freezing?*

Dang, this Winter has been a real pain huh?* This is supposed to be The South!
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Old 02-11-2011, 08:44 PM   #31
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RE: HVAC frozen up (literally!)

Woody,
Yes, I keep the cabin heat on to keep the FW pipes from freezing. I can't decide which is better- using space heaters which I hear about starting fires all the time, or the main cabin HVAC and hoping it doesn't freeze over. It happened that one time but it hasn't happened again. We had a cold snap where it didn't get above freezing for 4-5 days and I think that is what did it, plus the abnormally cold water. Right now both units are cranking out a nice 71 degree heat though and I am cozy as could be at the moment.
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Old 02-11-2011, 11:22 PM   #32
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RE: HVAC frozen up (literally!)

If you use her year round then I guess you don't want pink liguid running in your pipes!

Spring is just around the corner!
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Old 02-23-2011, 04:49 AM   #33
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RE: HVAC frozen up (literally!)

I can't decide which is better- using space heaters which I hear about starting fires all the time, or the main cabin HVAC and hoping it doesn't freeze over.

There are heat tapes that can wrap the exposed pipes , thermostat controlled so no waisted electric,
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