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Old 07-03-2015, 01:09 AM   #21
travelingnurse
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I have a Montana high country. It only had one A/C and I could not keep it cool at all in 85+ temps. Last week I installed a 13.5 Btu in the bedroom and I am 100% satisfied with the add on. It was the best 800$$ i spent. I bought a dometic. I installed it myself in about 2 hr, it was quite easy if your a handy person. Now my whole camper stays cool and comfy. I full time on a hospital parking lot in direct sun on an asphalt desert. The second AC is just worth it.
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Old 07-03-2015, 08:42 AM   #22
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I know I'm coming into the middle of this and don't want to redirect the thread, but this seeems like a good place for my question.

We are out for this 4th of July in Central Oregon and we are in the middle of a heat way (pushing 100 degrees). While this isn't the norm, it is making think about a 2nd AC unit. We plan on having this a long time so it seems like it may be worth the investment. So, how can I tell if my 327RES is wired for a 2nd unit? If it is, would it just add more air to the existing vents throughout the cabin? And would it use the same controls (one control that controls both units simultaneously) or would there be two controls.

Basically, in simple terms, what's involved in adding a second unit? Any ideas about cost?
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Old 07-03-2015, 11:53 AM   #23
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I know I'm coming into the middle of this and don't want to redirect the thread, but this seeems like a good place for my question.

We are out for this 4th of July in Central Oregon and we are in the middle of a heat way (pushing 100 degrees). While this isn't the norm, it is making think about a 2nd AC unit. We plan on having this a long time so it seems like it may be worth the investment. So, how can I tell if my 327RES is wired for a 2nd unit? If it is, would it just add more air to the existing vents throughout the cabin? And would it use the same controls (one control that controls both units simultaneously) or would there be two controls.

Basically, in simple terms, what's involved in adding a second unit? Any ideas about cost?
3 things to check:

1) Is your rig 50amp?
2) if so, there should be a circuit breaker labeled 2nd AC
3) If both are confirmed, there should be a Junction box with a blank cover on ceiling in front bedroom near roof vent.

If so, that is where you would wire the 2nd AC into. Keep in mind that running both ACs at one time would require 50 amp shire power.
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Old 07-03-2015, 05:06 PM   #24
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Yep on all - 50 amp, circuit breaker labelled 2nd AC, & junction box in bedroom. So installation shouldn't be an issue (for someone who know what their doing).
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Old 07-03-2015, 06:09 PM   #25
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Povo,

It's not really that difficult to install an air conditioner as long as the vent is cut in the roof and the wiring is installed next to the vent. The biggest "hurdle" is getting the unit onto the roof. After that, it's really not difficult at all.

Here is a link to the installation instructions. Look them over and see if you believe it is within your "level of experience" and your "physical capacity" if it is, you can save yourself $300 to $500 bucks with a "do-it-yourself" job.

http://www2.dometic.com/1f24ead8-631...87ce6bad.fodoc

Usually, for someone who has never installed an air conditioner, the time from start to finish (actual work, not chilling beverages for after the job) is about 2 hours.

Good Luck
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Old 12-06-2017, 07:17 PM   #26
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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   #27
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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   #28
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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   #29
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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   #30
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The genset is what was installed at the factory in 09. Currently has 720 hours.
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Old 08-29-2018, 03:32 AM   #31
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Ok, you said it would run either AC but not both. I'm assuming that you've tried both indivually. The next think I'd look at is a possible weak genny breaker. If you've got access to an amp clamp you could verify the current draw of each unit at your breaker/fuse box. If the units are the same size and make the current draw should be fairly close. If not this could indicate a possible AC issue.
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Old 08-29-2018, 04:06 AM   #32
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some told a trick. start with your bedroom a/c, turn temp to 60 degrees. than after it is running turn your front a/c on.

trick is the bedroom a/c will never get to 60 so the a/c will never recycle.
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Old 08-29-2018, 04:16 AM   #33
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Thanks for the responses.

I saw on a different forum some chatter about both A/Cs being on the same electrical leg of the genset thereby overpowering the circuit/breaker. It is pretty clear that both of my A/Cs are on the same leg as when it popped the genset breaker, both A/Cs stopped running while the remainder of the coach had power.

Am considering an attempt to discover how to move one of the A/Cs to a different power leg from the genset.

Has anyone attempted this before or if it can be done? Seems like moving the A/C breakers within the panel to put them on separate circuits may do the trick.
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Old 08-29-2018, 04:45 PM   #34
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Thought that i would share my fix for my AC problem. My genset is a 50 amp capacity with one breaker providing 20 amps and the second breaker providing 30 amps.

I discovered that both of my ACs were on the 20 amp circuit. I simply pulled the breaker box from the genset, swapped the wires on the 20 and 30 amp breaker. Problem solved.
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Old 08-30-2018, 03:35 PM   #35
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Quote:
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Thought that i would share my fix for my AC problem. My genset is a 50 amp capacity with one breaker providing 20 amps and the second breaker providing 30 amps.

I discovered that both of my ACs were on the 20 amp circuit. I simply pulled the breaker box from the genset, swapped the wires on the 20 and 30 amp breaker. Problem solved.
I hope you checked the wire size. 12ga wire isn't rated for 30 amps.
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Old 08-30-2018, 04:10 PM   #36
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I did. Was trained as an electrician as a young man. It was clear that the wires were placed on the wrong breaker when manufactured.

Cheers.
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Old 09-02-2018, 02:15 PM   #37
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Good find!
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