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Old 09-01-2013, 04:26 AM   #1
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Thinking about adding 2nd AC although I probably will wait until next spring. Anyway, our Cruiser is prewired and wondering what brand, BTU and style (ducted or non ducted) others have installed? While the duct is certainly available, it is only one branch of the 'H' duct, so I'm not sure a ducted model would provide much cooling to the rest of the fiver. So seems like a non-ducted unit would be better, but probably one that can be wired into the existing thermostat.

Also wondering about the wiring as there are 4 sets of wires. 120V power is in it's own box and there are three other sets tucked around the inside vent cover. I'm guessing one set is 12V DC power, one for the remote temp sensor on the bedroom wall and one set goes to the Dometic CCC thermostat. Can anyone confirm this?

So it seems like the Penguin II, non-ducted unit is maybe the best choice, but what BTUs? Please share your thoughts and experience.
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Old 09-01-2013, 07:10 AM   #2
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Larry,
When I was thinking of adding the second AC to my PP I had all the same questions. I also thought of low profile and standard (about 6 inches) In regards to the ducting or just down blow I the cost was much cheaper to just vent the second AC to the bedroom. I also thought I would really only use it during the hot day and not so much at night. So it one day CW was having a great sale and I got a 15K at a great price. Now there is always a but my unit the shower and bedroom is one and I find it had to vent the steam from the shower sometimes. If you have the enclosed bathroom it should be no problem.


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Old 09-01-2013, 12:08 PM   #3
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just make sure you can add a second air, my 305sk was set up for 50 amp and had wiring for a second air. Simple installation, take off vent in bedroom set a/c in. Only problem the vent stack for the black tank was right behind where the 2nd a/c was suppose to go and a/c would not fit, course I didn't realize it until I pulled off the vent and tried to put in a/c.So check your measurments
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Old 09-01-2013, 11:45 PM   #4
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I had a Dometic 13,500 brisk air installed when we bought our unit. Ours was prewired for a 2nd a/c in the back end of the rv. It is ducted into the system. There is a noticeable difference in cooling the trailer when both units are running, once I figured out how to set the supply grills for the most efficient air circulation. Running the 2nd unit freezes me out at night. We usually stay comfortable in the 100 degree plus Texas heat. Edited by: martinstwopopfarm
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Old 09-02-2013, 01:24 AM   #5
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Larry:

Topper's installed a Coleman Mach !!! 13,500 BTU unit for us. It is not tied into the factory ducts or thermostat and has it's own controls. So far we have been very happy with it. The additional unit really helps cool down the trailer on those hot summer days. The installation added about 6 inches in height so we are now at 13' 6". Have to watch some of the low overpasses.
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Old 09-03-2013, 03:31 AM   #6
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Quote:
Originally Posted by gball
Larry:

Topper's installed a Coleman Mach !!! 13,500 BTU unit for us. It is not tied into the factory ducts or thermostat and has it's own controls. So far we have been very happy with it. The additional unit really helps cool down the trailer on those hot summer days. The installation added about 6 inches in height so we are now at 13' 6". Have to watch some of the low overpasses.

George,

Was your Cruiser pre-wired for the 2nd a/c?
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Old 09-03-2013, 03:39 AM   #7
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It was pre-wired. They just didn't tie it into the existing duct system or thermostat.
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Old 09-03-2013, 03:48 AM   #8
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Thru my research, I have found what appears to be a huge issue with how CR designed the air distribution system on my Cruiser. Dometic's documentation recommends an 'H' layout and REQUIRES minimum of 8 registers per A/C, so dual A/Cs should have 16 registers (again per Dometic). My Cruiser only has 5 registers and just 2 legs. The curb side leg runs from the main A/C unit to the back of the Cruiser with just 2 registers and the street side leg runs from the A/C to the front of the Cruiser with the other 3 registers. And lacking the other two legs, there is really no practical place to add registers. Dometic's documentation states "Important: </span>Alternate configurations and methods may be used which still allow the air conditioner/heat pump to operate properly; however, these alternate configurations and methods must be approved by the Dometic Corporation in writing."</span></span> So, I've sent emails to both corporations on this issue.
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Old 09-03-2013, 05:20 AM   #9
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You have discovered what I found out when researching a second AC for the new trailer. My previous trailer had 2 ducted AC's and only 4 registers. Which according to the Dometic installation instructions I saw was the absolute minimum for 1 AC. That's why I ran one with the quick cool open partially.

My new trailer has the main AC ducted and the second is not ducted, bedroom only. I still run the main with the quick cool partially open and the bedroom ac cools the bedroom. Both use the same thermostat for control which is nice. I had to insulate the bedroom temp sensor to keep the BR ac from quick cycling as the sensor is mounted on the wall just below an outlet.
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Old 09-03-2013, 06:57 AM   #10
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I check with a few friends that have the 2nd ac. All are single units that do not have a duct-work system. It only blows out the sides or ends of the ac. BTW, these were all factory installs. They also came with a remote if your thermostat was not set up for zones.

Edited by: mark5w
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