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Old 08-12-2014, 03:04 PM   #21
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Thanks for the offer guys- and I could use the help. This took WAY longer than I planned!


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Old 08-19-2014, 08:19 AM   #22
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This took WAY longer than I planned!

Boat repair, 90/90 rule,

90% of the work takes 90% of the time

the remainder of the work also takes 90% of the time.
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Old 08-19-2014, 11:10 AM   #23
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Is the A/C outlet attached to some ducting?
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Old 08-20-2014, 08:54 PM   #24
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Capt. Bill11, it is. I didn't realize after the install I didn't take any pictures of it. Dennis at Mermaid said that the one short 6" run to the saloon and a 4" dedicated to the aft cabin would work fine (though their literature stated I would need more square inches). We went back to the boat last Friday evening and never could get it cooled down. I had pulled the "bra" the prior weekend and dropped it off as a sample to have a new one made that also will have a more efficient sunblocker screen. The old Cruise Air unit seemed to cool the boat fairly well when charged, but the new unit did not get it done. Even on Friday and Satirday night.
I checked the temperature differential, and we are dead on at 20 degrees. The evaporator is sweating and condensation is in the pan.
The temperature last weekend hit the low 90's- and the humidity was over 70% much of the time. So Monday I talked to Dennis again and when the bra gets installed and the humidity drops we will reevaluate.
Presumably the heat from the sun (radiant??) through the front three windows and the front two side windows is really a major problem. And possibly the "bra" creates an air space between the screen and the glass which acts as an insulator?? I sure hope so- and hope to get this girl comfortable after our investment.

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Old 08-21-2014, 08:28 AM   #25
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Certainly the windshield screen helps greatly in reducing cabin temperature, although at night you should have no problem getting down into the 60's, if not might be too large of an area for even one 16K unit. Might want to get an AC guy in and just check the pressure levels on the unit, maybe a little shot of Freon would help (just throwing out idea's, not necessarily good ones!)
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Old 08-21-2014, 06:26 PM   #26
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That's what I was sorta thinking too- actually we have a front 16k unit as well. I picked up the cover today and will install snaps and install this weekend I hope.


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Old 08-21-2014, 06:55 PM   #27
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Greetings,
Mr. F. Maybe you need one of these...
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Old 08-21-2014, 08:03 PM   #28
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The 12 in my pilothouse will not overcome the solar heat coming in the glass in mid day. But it chills it right down if there is no solar. I sized it on the small size on purpose, and that shows up in mid day. Still cools it enough to take the edge off.
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Old 08-22-2014, 06:56 AM   #29
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The 12 in my pilothouse will not overcome the solar heat coming in the glass in mid day.

Outside snap on window covers ??

Awning?
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Old 08-22-2014, 09:13 AM   #30
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It's where I pilot from, so the glass needs to be unubstructed. As long as I get a cool breeze and lower humidity, I'm happy. No need for it to be kept at 74F constantly. And if I'm moving, I usually run with sliders open and AC off. I don't spend much time inside the boat unless moving, or sleeping. Completely happy with the 12 in pilot house and 6.5 in bunkrooms fwd.
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Old 08-23-2014, 09:07 AM   #31
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Quote:
Originally Posted by Forkliftt View Post
That's what I was sorta thinking too- actually we have a front 16k unit as well. I picked up the cover today and will install snaps and install this weekend I hope.


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if you look at my profile and see the covers thats the way i kept my boat cool
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Old 08-23-2014, 11:37 AM   #32
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What is the temperature of the air coming out of the unit right at the outlet?
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Old 08-23-2014, 11:47 AM   #33
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Capt.,
I checked using two thermometers at the same time. One inserted in the return air "filter" on the unit and the other inserted in the saloon vent. I can't remember exactly, but it dropped some at night and steadily increased during the day. A steady 20 degree differential for the most part. Coolest temp was around 61.


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Old 08-23-2014, 12:01 PM   #34
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This is the boat with the cover off. It covers front three windows and then wraps around to catch one window on each side. Boat faces South. Click image for larger version

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Old 08-23-2014, 12:48 PM   #35
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Capt.,
I checked using two thermometers at the same time. One inserted in the return air "filter" on the unit and the other inserted in the saloon vent. I can't remember exactly, but it dropped some at night and steadily increased during the day. A steady 20 degree differential for the most part. Coolest temp was around 61.


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The outlet air temp should be in the mid 50s. Is your outlet air duct insulated?
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Old 08-23-2014, 01:06 PM   #36
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Well... Not exactly. Temp out depends on where you start. Non insulated ductwork, but only a 3' run (inside the locker).


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Old 08-23-2014, 04:56 PM   #37
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Well... Not exactly. Temp out depends on where you start.
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To a point. But on most A/Cs you will see outlet temps in the mid 50s to low 60s pretty quickly after they start up. If you've got the right sized unit and it is functioning properly. At least that is what I've seen over the years.
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Old 08-23-2014, 10:16 PM   #38
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True and that is what is so puzzling about this situation. With the temp/ humidity coming up so much AND the removal of the window covering, a lot of things changed at once. I certainly thought it would make a noticeable difference, and it didn't.

I have been working on my Ford 6.0 engine all day (died Wednesday, hauled to my shop) and probably won't make it to Gulfport tomorrow to install the new "bra".


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Old 08-23-2014, 10:53 PM   #39
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Yeah window covers make a huge difference in the heat load. But it should have cooled down well at night.
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Old 08-31-2014, 11:38 PM   #40
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Well.. Today I got to the boat around 2:00 with the new replacement window cover. I held it in place with tape/ etc. as I measured up and installed the snaps to match the existing ones on the boat. This gave me sun blockage for the rest of the afternoon while the recently installed Mermaid AC unit did it's job. The humidity was high again today, but the temp was 5 degrees lower than my last time to Gulfport. I'm not happy to report that by 6:15 PM today the unit had only been able to cool the saloon down to about 92 degrees per the thermostat (about waist height). Temps at the unit were 72 out of supply side, and 92 at the "filter". Rather than trying to make it through the night with no better cooling than that, we opted to come home. I'm a little frustrated here. The 31 year old (I believe) rusted out Cruise Air 16K unit I removed actually still cooled the boat fairly well, it just had a slow leak. I'm gonna shoot an email to tech-supportClick image for larger version

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