Is it possible that the 400 DB, having the unit under the steps in the middle of the boat, is not sucking in outside air whereas the 44 DB, having the unit on the edge of the boat next to the outside air vent, is sucking in outside air?
How Cold is Cold? (A/C question)
- Thread starter Converse48
- Start date
Converse48
Well-Known Member
This thread is dragging up memories... the main diff between my friends boat (400DB) and mine are twofold: his air intake is not drawing from the outside (like it is on the 44), and the smaller window area makes for the thermal load (not sure if that's an accurate technical term... but you know what I mean) when the sun is out.
My issues have been largely resolved with darkening shades I use on sunny, hot days for the front and side windows; by forcing more airflow from the front unit into the salon; and by using a circulating fan to move the air around in the salon.
What I haven't done yet is to fix the restriction that SR built in to the air outlet in the salon and to close all the points of entry for outside air.
Even without those fixes, the situation is greatly improved.
Thanks for the memories!
- Nov 12, 2006
- 5,334
- Boat Info
- 1999 Sea Ray 330DA
Twin 7.4 MPI (310 propshaft HP) V-drives
- Engines
- Twin Mercury Marine marinized 7.4L L-29 V8s
Cast iron block w 4-bolt mains
Nevermind. I didn't realize that guy resurrected last years thread.
Converse48
Well-Known Member
Exactly.
sbw1
Well-Known Member
- Oct 10, 2006
- 8,188
- Boat Info
- This is listed in my signature
- Engines
- This is listed in my signature
Bought my boat new in 2004 and had 3 a/cs installed in the first 6 weeks because of poor cooling down below. Boat was a new model and the builder installed what Marine Air recommended. It was just too small and performed like others have mentioned on this thread. Long story short--went from 12,000 to 16,000 btu and the problem was solved and the manufacturing spec was changed. Delta T is 21 degrees on an instant read thermometer. Air out of the unit is 49 degrees when dew points are in the mid to high 70's and outside temp is 100 degrees. Cabin temp is 65 and about 58 degrees in the forward berth. The instant read thermometer sits in a drawer in the galley and always reads 61 degrees. This performance depends on keeping the fan set to constant on at a moderate speed that is easy on the ears. We keep the hatch covers pulled when the sun is high in the sky and the door shut. There is no substitue for BTUs on a boat.
Robski97
Well-Known Member
Frank,
Quick way to tell if the charge is off... or anything else for that matter is always the supply temp vs return temp. This will be an indicator if anyting is wrong. ( and most simplistic ) Then u can go to town measure dry bulbs and all that .... but if u only have 10 degree differential that stuff wont help...
I got a question now ... Any one in a DA tint there cockpit windows ? Is so how dark and any issues with doing it ?
Rob
Quick way to tell if the charge is off... or anything else for that matter is always the supply temp vs return temp. This will be an indicator if anyting is wrong. ( and most simplistic ) Then u can go to town measure dry bulbs and all that .... but if u only have 10 degree differential that stuff wont help...
I got a question now ... Any one in a DA tint there cockpit windows ? Is so how dark and any issues with doing it ?
Rob
sea salt
New Member
Would make night riding a little difficult, if not down right dangerous. I would just have a screen made.
sbw1
Well-Known Member
- Oct 10, 2006
- 8,188
- Boat Info
- This is listed in my signature
- Engines
- This is listed in my signature
Have you forgotten that boat A/C does not suck in outside air? Go back and read the posts that flamed the famous Tiara fresh air intake discussion about CO.
I did... and I found this post I made in that thread:
Now go find a Tiara board ass wipe. The discussion HERE is about 44 DBs... Not Sundancers. Why you need to hang out here and bash Sea Rays is beyond me...
Now go find a Tiara board ass wipe. The discussion HERE is about 44 DBs... Not Sundancers. Why you need to hang out here and bash Sea Rays is beyond me...
Last edited:
sbw1
Well-Known Member
- Oct 10, 2006
- 8,188
- Boat Info
- This is listed in my signature
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- This is listed in my signature
No bashing here and not a lot of rude comments either.
sea salt
New Member
Why it's tolerated is even more of a mystery. I gave you balls for having balls.:smt038
Jus' Chillin
New Member
Well back to the subject at hand.... on my 44, my salon a/c is under the entertainment center up against the side of the boat, BUT I checked this weekend, just rather quickly, and there is an insulated wall behind my unit. As I said, just gave it a quick glance, but contacted CruisAir and they are heading back out to my boat. He did ask me to do a quick check on the variance between air temp coming out of the duct vs thermostat reading on the wall. I do have a question on the outside air thing...we anchor and always run the genset which exhausts on the starboard side (same side as the a/c unit). If it were drawing outside air, how would it eliminate drawing in exhaust from either the motors at idle where exhaust is above waterline and out the side, or the genset? Sorry as it's apparent you guys covered this before i bought my boat but appreciate it if someone can spare a quick recap. Thanks guys.:grin:
