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Old 06-21-2015, 02:35 PM   #1
jdjones
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Another Air Conditioner Question

We have a 2014 Sprinter 324FWBHS that only comes with one air conditioner in the living room (which is in the middle of camper) and is wired for a second unit in the front bedroom. My question is how will adding the second unit help cool the bedroom in the back where it is extremely hot. We went through the camper and made sure all the duct work that we could reach was sealed tight and that helped a little but it is still uncomfortably hot during the afternoon. When they install the second unit do they close off the ductwork to the front bedroom so that more cool air goes to the back of the camper?
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Old 06-21-2015, 02:54 PM   #2
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I am not sure where you live/camp but if the rig is in full sun in 80 plus Temps it will be tough to keep the rig cool. I Park my 340 fiver ( a little bigger than yours) at a partially shaded site and my one 15k but AC keeps it comfortable.
One thing I did on mine was close off the main ceiling duct behind the last rear and forward vents (using rags and foil tape). This increased air flow to those vents noticeably. I also partially closed off vents where air was coming out to fast. This Sent more air flow to the very to that needed it (front and rear). Each rig is different. I would play around a little bit to make sure the air flow on tthe AC you have is maximized.
Also try removing the inside cover (4 or 5 screws) and makes sure the plenum is sealed between supply and return side. Also while in there, make sure foil tape is neat and smooth and no openings into ceiling cavity except that for where the fire and aft ducts go out. I had to complete redo the sloppy job done at the factory. All these things help maximize efficiency and flow.
I hope this helps.
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Old 06-21-2015, 03:04 PM   #3
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Almost doubling the A/C tonnage will cool the entire rig. We can keep our rig quite comfortable with the 15K in the rear and the 13.5K in the front, even on the 100+ degree days. The biggest thing you can do, is turn the units on early, before the rig gets heated up.
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Old 06-22-2015, 05:30 PM   #4
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Thank you for your responses. We camp mostly in TN....hot summers with high humidity. We have lots of kids in and out of the camper and I think just one air conditioner isn't going to cut it. We have resorted to using a portable air conditioner in the back bedroom and it helps somewhat but takes up too much valuable space when using and when storing. I just needed a little reinforcement when pleading my case to my husband for a second unit
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Old 06-24-2015, 07:14 AM   #5
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. I just needed a little reinforcement when pleading my case to my husband for a second unit
We added a bedroom A/C to ours and it was worth every penny!
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Old 06-25-2015, 01:00 PM   #6
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I've got the same setup you're wanting. I close off the vent in the front bedroom when running both of them. We also use the foil bubble type insulation in the windows during the summer.
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Old 06-25-2015, 06:55 PM   #7
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Ducted will require a "dual zone" thermostat to operate, non ducted will have the controls on the unit.
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Old 06-26-2015, 02:49 AM   #8
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Ok, I have a carbon 327 with dual ac units, the 2nd in the bedroom. they are both ducted and I have a dual zone thermostat. My question is I have a reservation at a campsite that only has 20amp service, I know I cant run both AC units. will running the one main unit cool the bedroom as well as the main cabin? Is the duct work all connected to each other? My other option would be to run the generator so I could cool down the trailer then run just the one at night off the shore power.
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Old 06-26-2015, 04:21 AM   #9
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Just looked over at the monitor As far as I tell only AC is running and drawing 17 amps from that phase. Probably can run one Ac and not much or anything with it. Have heard people run AC off their home 20 amp circuit with no problem. Make sure the cord you use is at least 12 gauge
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Old 06-26-2015, 06:09 AM   #10
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Just looked over at the monitor As far as I tell only AC is running and drawing 17 amps from that phase. Probably can run one Ac and not much or anything with it. Have heard people run AC off their home 20 amp circuit with no problem. Make sure the cord you use is at least 12 gauge
I know I can run one unit and I also know the second will trip the breaker. I didn't know if the main unit would push air to the front vents or are those bedroom vents only connected the bedroom ac unit?
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Old 06-26-2015, 07:05 AM   #11
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I've run the AC off a 20amp circuit at the house before while cleaning it, no problems.

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Old 06-26-2015, 07:13 AM   #12
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While it may be possible to run your A/C using a 20A circuit, don't forget that you may run into difficulty if you start using the microwave, hot water tank (on electricity) or any other higher-amp items - coffee pots, hair dryers, etc. at the same time. By the time the A/C "gets what it needs" from 20A, there isn't much left over.
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Old 06-26-2015, 07:14 AM   #13
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Both units? I know one will run, but will it be enough to cool the trailer in 80 degree weather.

My real question wasn't will it run or if I can run both units, because I know both wont run on a 20amp circuit. But will running just one unit be enough to cool the bedroom.

BTW...my previous 32' outback ran no problem on a 20 amp, but it only had one unit and that did a fair job of cooling the trailer. My new trailer has a bedroom that is really separated form the main trailer.
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Old 06-26-2015, 07:23 AM   #14
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Both units? I know one will run, but will it be enough to cool the trailer in 80 degree weather.

My real question wasn't will it run or if I can run both units, because I know both wont run on a 20amp circuit. But will running just one unit be enough to cool the bedroom.

BTW...my previous 32' outback ran no problem on a 20 amp, but it only had one unit and that did a fair job of cooling the trailer. My new trailer has a bedroom that is really separated form the main trailer.
We have a ducted a/c in the main cabin and a non ducted in the bedroom. What we have done in the past if we were at a 30 amp site rather then 50 amp is run the main a/c during the day then turn it off and run the bedroom a/c at night to sleep. This may work with your dual areas, not ideal but the best I could think of. Another thing we do when going on short trips is turn the a/c on at the house a couple days in advance so the inside of the trailer isn't like an oven when we get there.
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Old 06-26-2015, 07:51 AM   #15
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thanks for the suggestions, I guess I can investigate this by turning on the main unit and seeing if I get air coming out if the vents in the bedroom.
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Old 12-06-2017, 07:17 PM   #16
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As a newbie to RVing, how can I tell if my 2008 Raptor is pre-wired for a second AC unit?
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Old 12-06-2017, 07:23 PM   #17
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As a newbie to RVing, how can I tell if my 2008 Raptor is pre-wired for a second AC unit?
If your unit is 30A service, it WON’T be prewired for 2nd A/C.
If your unit is 50A service, then look at the ceiling where your trying to put the second unit. If there is a junction box cover then odds are it’s for the second unit. You can also remove the Garnish ring, and look for then110 wiring. The “garnish ring” is the trim ring that is screwed to the ceiling.
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Old 08-28-2018, 10:04 AM   #18
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Not to hijack this thread but am having problems with my dual A/Cs. When only on the genset I can't run both A/Cs. Don't yet know about shore power. My genset is 50 amps. The generator will power either a/c but not both. When I attempted both, it tripped the breaker on the genset. As the camper was heat soaked (over 90 degrees) should I have let the main one run first to cool down the coach before turning on the bedroom A/C? Any suggestions appreciated.
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Old 08-28-2018, 10:15 AM   #19
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How old is your gen? How many hours on it? I'd lean towards a tired gen?
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Old 08-28-2018, 10:27 AM   #20
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The genset is what was installed at the factory in 09. Currently has 720 hours.
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