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Dual Zone HVAC problems
Posted: March 29th, 2025, 8:46 am
by Aflix
HI
I have a Carver 33e aft cabin (1992) - the master state room cooling works fine, both water pumps also are working, but the salon system isn't cooling - and thoughts/recommendations (HVAC guy wants to do complete replacement - seems ridiculous to me?
Thanks everyone!
Re: Dual Zone HVAC problems
Posted: March 29th, 2025, 10:24 am
by Carverlvr2
I had the same boat for many years. Is he talking about just replacing the salon unit or the entire system? If original, that’s a good long life. Again, if all original, I’d say at least the Solon unit and the water pump. But maybe since he’s already out there, maybe the extra $1800-2k for the aft unit too and no worries for many years?
Re: Dual Zone HVAC problems
Posted: March 29th, 2025, 10:06 pm
by buster53
Just to clarify, you say each ac unit has its own water pump? That’s unusual as usually, one pump services several ac units. My current 356 has one pump for 2 units and some years ago, I had a 3807 with 3 units and only one pump.
Exactly what did your ac guy say as to his thoughts of replacing the unit? At 33 years old, the unit could easily be shot and just not repairable, at least not for a reasonable amount of cash. And does he want to replace both units or just the one no longer working?
Re: Dual Zone HVAC problems
Posted: April 1st, 2025, 11:37 am
by Aflix
yes, sorry its one water pump....the master state room does cool, but the salon/forward doesnt - and yes, he wants to replace the whole thing. Personally I dont understand why one room can cool and the other cant if it is the same system!
Re: Dual Zone HVAC problems
Posted: April 1st, 2025, 11:50 am
by Carverlvr2
You have two separate condensing/compressor units (one forward under the galley seats if I remember, and one aft under the bed?) but they are both fed water from the same pump. Everyone’s budget and needs are different but I would say do the whole system if you can. These units seem to last about 20 ish years and are either not repairable or just not worth it. New units from Webasto or Marinaire seem to be more efficient and quieter as well. Just my .02 but in boat bucks is always $thousands! lol.
Re: Dual Zone HVAC problems
Posted: April 1st, 2025, 12:42 pm
by buster53
Carverlvr2 wrote:Source of the post You have two separate condensing/compressor units (one forward under the galley seats if I remember, and one aft under the bed?) but they are both fed water from the same pump. Everyone’s budget and needs are different but I would say do the whole system if you can. These units seem to last about 20 ish years and are either not repairable or just not worth it. New units from Webasto or Marinaire seem to be more efficient and quieter as well. Just my .02 but in boat bucks is always $thousands! lol.
Yes, your 33 is very similar to my 356. Aft unit underneath the bed and forward unit underneath the forward galley seat. At least, that is my setup. 2 completely separate units, but they do share a common water pump.
Re: Dual Zone HVAC problems
Posted: April 5th, 2025, 10:10 pm
by buster53
Aflix wrote:Source of the post HI
I have a Carver 33e aft cabin (1992) - the master state room cooling works fine, both water pumps also are working, but the salon system isn't cooling - and thoughts/recommendations (HVAC guy wants to do complete replacement - seems ridiculous to me?
Thanks everyone!
What did you decide to do?
Re: Dual Zone HVAC problems
Posted: April 8th, 2025, 8:11 am
by Aflix
I had someone else come and look at it, and he thinks it's a leak in the salon condenser and that he may be able to fix it...otherwise I am looking at this thing....
https://seawaterpro.com/products/12v-ma ... zoQAvD_BwEhas anyone installed a 12v system?
And thanks for all the help guys!!!!!
Re: Dual Zone HVAC problems
Posted: April 8th, 2025, 5:14 pm
by buster53
Ok, your boat has 2 separate AC systems. Are you going to replace both with 12 volt units or keep the one that still works and only replace the bad one? Doesn’t make sense to have one 120v unit and a second, 12v unit. If you do replace the non working one, you will need to go with a 12000 BTU unit and that will need SERIOUS battery back up, way more than you have now.
If you have to replace, stay with what you have and go 120v.
Re: Dual Zone HVAC problems
Posted: April 9th, 2025, 2:42 pm
by km1125
If you do go with a 12V system, you might also need to upgrade your battery charger to keep the batteries maintained while the AC unit(s) are running, whether at the dock or on the genset.