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Old 05-22-2013, 10:39 AM   #1
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Adding a second air conditioner

I have been investigating adding a 2nd ac in a 2013 34TBOK. I have chased many threads on this but i'm still unsure as to what is needed. I am wired for a 2nd ac, including T-stat, and do have a 50 amp service so no issues there. I have narrowed it down to the Dometic Penguin 2 for clearance in storage. Now for my questions:is 13.5k btu enough or should i jump to 15k? We are heading to the Grand Canyon in the middle of summer and do not want to be unable to cool off trailer. I am also puzzled over what i have read about ducting. Seems like some people are tying into existing ducting and others are not. If the Tstat is in the bedroom, what advantage is there into tying into ducting? Would it be wise to tie it in with a manual damper in case 1 unit goes down and you could "limp" through with the other by opening up the damper? Wouldn't it be OK to just have it dump into bedroom? That leads me to what ceiling panel do I get? Obviously no controls are needed so would a standard grill with the kwik cool feature work? Basically identical to my main ac in living area. Does the unit come with any type of grill? All i can find are the controlled ceiling grills as options. Penguin 2 13.5k's seem to be going for $700 with shipping online. Anyone find a better deal?

If any other Sabre owners have already tackled this upgrade I would love to hear from you. Pictures are also welcomed! Thanks in advance!

Have a safe and fun Memorial Day everone!
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Old 05-22-2013, 11:22 AM   #2
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I ordered my Sabre 35QSIK w/ the 15k main AC and the 13.5k in the bedroom and specified that both AC's be connected to the internal ductwork. My thinking was that if I couldn't connect to 50A service the 13.5k unit would be less taxing from a total wattage standpoint using the 30A off of either my two Honda 2000's or a CG that hasn't upgraded their poles. With both units working, using the AC dump feature on the bedroom unit at night would mostly divert that units cooling from the ductwork regardless.
Doc
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Old 05-22-2013, 11:59 AM   #3
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And yet another senario I hadn't thought of! Now thats putting the noggin' to work. Good thinking Doc. I currently have a Honda EU 2000 and I am going to get a second parallel unit when I need it. By running the 13.5, I can see there would be a great advantage when on genny power. Another thing I have read in threads is that people often comment that the 13.5 cools great in the bedroom but the 15k in the main area often never turns off. I can see an advantage of having the 13.5 tied in with the kwik dump closed to boost the capacity in the main area as that load is heavier during the day with the sun and 2 kids that can't seem to figure out if they wanna be inside or outside. By the time you go to bed, sun is down and kids are finally in(i hope) so the 15k is not as taxed. Open up the kwik dump and good to sleep in comfort.

So my guess Doc is that when you do this on a genny, you use a 30 to 50 amp plug converter and not turn on the 15 k unit?
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Old 05-22-2013, 12:00 PM   #4
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And Doc, one more question if I may, is your unit a low profile or a standard?
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Old 05-22-2013, 12:08 PM   #5
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Quote:
Originally Posted by SparkyKnight View Post
And yet another senario I hadn't thought of! Now thats putting the noggin' to work. Good thinking Doc. I currently have a Honda EU 2000 and I am going to get a second parallel unit when I need it. By running the 13.5, I can see there would be a great advantage when on genny power. Another thing I have read in threads is that people often comment that the 13.5 cools great in the bedroom but the 15k in the main area often never turns off. I can see an advantage of having the 13.5 tied in with the kwik dump closed to boost the capacity in the main area as that load is heavier during the day with the sun and 2 kids that can't seem to figure out if they wanna be inside or outside. By the time you go to bed, sun is down and kids are finally in(i hope) so the 15k is not as taxed. Open up the kwik dump and good to sleep in comfort.

So my guess Doc is that when you do this on a genny, you use a 30 to 50 amp plug converter and not turn on the 15 k unit?
Spark,
This is just my .02 worth, for what it's worth.
I have the 15K in the rear and 13.5K in the bedroom. If I just use the 13.5 in the bedroom, the DW and I both think it is too loud for one and the other issue, is you can hang meat in there! Especially if you use the quick dump feature!! It produces very nice cold air. And, IMHO too cool to comfortably sleep. We used it here in SC, on the coast and thought it was a bit too chilly. Our solution was to turn off the bedroom A/C, turn on the rear 15K unit (they are ducted together) and let the rear unit cool the bedroom. We have done this once and it worked great. Plus, it was a much less noisey night! Just a thought.
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Old 05-22-2013, 12:25 PM   #6
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BombDoc, thanks for the info. Sounds like you have an efficient 15k unit. After reading many threads about the differences in cooling capacity from owner to owner, I wonder if its a installation issue. Seems like many people have gone back and re-sealed, inspected units and corrected problems. Did you find anything askew with yours? The dealership we purchased from said very rarely does anyone add the 2nd ac. Granted we live in Minnesota but this struck me as odd. I would rather have and not need than need and not have. Noise is definetly a concern. Whats worse, no sleep from noise or no sleep from sweat?? I guess if my beer stays cold, the rest is trivial.
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Old 05-22-2013, 12:30 PM   #7
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So my guess Doc is that when you do this on a genny, you use a 30 to 50 amp plug converter and not turn on the 15 k unit?
Yup, that's the plan.
Quote:
Originally Posted by SparkyKnight View Post
And Doc, one more question if I may, is your unit a low profile or a standard?
Don't know yet, still waiting on delivery. I didn't specify any particular units, just the ones that come with the Sabre Platinum Edition as outfitted with the two-AC option package. Looking at pics from dealer sites with that same option package, though, they look to be standard height units.
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Old 05-22-2013, 12:33 PM   #8
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Originally Posted by SparkyKnight View Post
I guess if my beer stays cold, the rest is trivial.

Doc
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Old 06-03-2013, 05:14 PM   #9
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I didn't specify any particular units, just the ones that come with the Sabre Platinum Edition as outfitted with the two-AC option package. Looking at pics from dealer sites with that same option package, though, they look to be standard height units.
Doc
Got my first look at the new rig today (arrived at dealer late last week). The two AC's are standard height units and both are connected to the central duct system. Played around with it a bit today at lunch, running both AC's one at a time and checking airflow at all the ducts, noted pretty decent airflow at the bunkhouse outlets running just the front br 13.5k unit, a little stronger when the 15k was running. Either way I should be able to cool the rig using either unit while running off the gennies or a 30A pole.
Just FYI,
Doc
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Old 06-09-2013, 02:30 PM   #10
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I think if you are a 30 amp site, with the adapter needed to connect your 50 amp main cord there will not be power - as in a dead feed for the second A/C unit. Without two 50 amp feeds for the 2 50 amp breakers, half of the cord will be dead. You will only have a single feed from the 30 amp box 1 hot, 1 neutral, one ground (3) wires. In the 50 amp, you have 2 50 amp hot, one neutral and one ground (4) wires.
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