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Old 03-10-2016, 03:00 PM   #11
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Atwood A/C

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What model number Atwood did you use? Did the ducted ceiling kit fit without modifications?

Thanks,
Atwood 15033, 15K heat pump, 15022 ceiling assembly and adapter 15089. The adapter allows you to easily connect the thermostat wires to the molex connector at both the roof unit and the thermostat. The unit comes with a long data cable, but you don't have to run it (unless you like fishing wires through a motorhome) - I used the existing thermostat 6 wire conductor along with the 15089 adapter.

I had to modify (cut slightly) the plastic T brace that goes in the seams in the ceiling since the Atwood ceiling assembly is larger than the Dometic.

There was no cutting at all to the roof opening as it is standard. The wiring was the most difficult part only because I wasn't exactly sure which wires ran from the roof unit to the furnace. Once I figured that out it was pretty simple.
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Old 03-12-2016, 01:42 PM   #12
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Have you gotten to use it while running other appliances in the coach?
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Old 03-12-2016, 02:07 PM   #13
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I am very pleased so far

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Have you gotten to use it while running other appliances in the coach?
Mr. Cavitt,

In a word, yes. Now for the details -

Shortly after completing the install, I started the generator, let it warm up for 5 minutes and then turned on the A/C on high. The converter (PD9200) was in boost mode as the batteries were a bit low and then I ran the microwave. The generator did not have any problems.

I let it run for quite a while, tried all three fan speeds and then let the engineer spouse come evaluate the install. She was thrilled at the noise level (or should I say lack of noise). We were able to hold a conversation at the dinette directly underneath the ceiling diffuser assembly with the diffuser wide open. It was quieter yet with the diffuser vents closed and even quieter with the fan on low.

Once on shore power, I checked the amperage draw on the Progressive Industries EMS remote display - 10 amps A/C on high with the converter in normal mode, 12 amps when the converter was in boost mode. I had checked the old Dometic under the same conditions - 3 amps more.

Keep in mind the Atwood I installed is the 15K heat pump unit, versus the 13.5K cool only Dometic that was required with the QD3200 diesel generator.

My recommendation would be to take a sound measurement in a unit with the Dometic A/C and compare it to the Isata 3. Mr. Clemens indicated Dynamax is using the Atwood. Clearly, the Atwood performs better (higher SEER), is much quieter and has a lower current draw than the Dometic. Additionally, given the cost of the diesel generator upgrade, if you ever decide to offer it again, increase the price another $150 and include the Atwood as part of the package.

Hope this information is useful to you.
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Old 03-12-2016, 03:00 PM   #14
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Thanks for the info and the review.

In good ol' muggy Georgia this looks like a very good upgrade. And cutting the A/C noise levels would be a plus as well....
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Old 03-13-2016, 11:28 AM   #15
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You are welcome

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Thanks for the info and the review.

In good ol' muggy Georgia this looks like a very good upgrade. And cutting the A/C noise levels would be a plus as well....
I hope so, it was not an inexpensive modification. But it should contribute greatly to our comfort and enjoyment.

Given all the issues with the Dometic (noise, high current draw,reliability, etc.), maybe FR will take note and evaluate the Atwood a/c on the Solera and Forester MBS. The Dynamax Isata 3 Sprinter based MH already has it.
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