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Old 05-31-2016, 07:14 PM   #15
Amg
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I live in south Florida. I lower the sun shades, cover the front window and side windows from the inside. Set the thermostat to 75 degrees. I frequently check the inside temperature remotely with my temperature alert and it does fluctuate between 75 and 77 degrees as the compressor cycles. Never had a problem in keeping the rear of the van 75. The front driving area is warmer as I would expect.
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Old 05-31-2016, 09:38 PM   #16
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If the outside ambient is above about 85*, I doubt your rear A/C will maintain 75* by itself.
An air conditioner should maintain a temperature differential of more than the 10° you cite, unless it's either malfunctioning or woefully undersized. An Interstate's A/C is not undersized.

Under ideal conditions, my Interstate's air conditioner can maintain a differential of more than 30°F below the outdoor temperature. Under less-than-ideal conditions (parked in direct sun and facing a direction where the awning doesn't provide afternoon shade) it will still maintain a differential of at least 20°F below the outside temperature as long as I keep the windshield and windows covered.

The only part of an Airstream Interstate that is really well-insulated is the floor. So the more shade you have, the better. And the more you can block sunlight and heat from entering through the windshield and windows, the better as well.
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Old 05-31-2016, 10:52 PM   #17
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Dometic says the drop across the evaporator is about 20* so everyone else's A/C must be operating a whole lot better than mine because w/ seven or eight people, it is lucky to maintain 85* and that's w/ the front running Max/Recirc.
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Old 05-31-2016, 11:46 PM   #18
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Dometic says the drop across the evaporator is about 20* so everyone else's A/C must be operating a whole lot better than mine because w/ seven or eight people, it is lucky to maintain 85* and that's w/ the front running Max/Recirc.
Well, seven or eight people crank out a lot of body heat that I don't have to deal with as a solo traveler. Maybe that's the difference.
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Old 06-01-2016, 09:03 AM   #19
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It is a small device powered by AC or battery that will notify you by phone, email and text message if the the alarm is triggered. The temperature either low or high can be set and so can it if it loses A/C power or the battery is low. It just plugs in. there is a monthly subscription. There is an app for a smartphone where I can monitor everything remotely.
Can you tell me who manufactures the device?

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Old 06-01-2016, 09:13 AM   #20
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Yes temperature alert. Their website is www.temperaturealert.com
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Old 06-02-2016, 07:00 AM   #21
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Yes temperature alert. Their website is www.temperaturealert.com
Nice. This has come up before in the context of cellular security cameras coupled with a similar device. I believe it's the Wendlands who use a dual-purpose device - it alerts them if the temp gets too high (they have a dog that they keep in their Roadtrek CS) but it also streams pics of the inside of the van and alerts their cell phone if there is a break-in.

I've looked at the products currently on the market and IMO, none of them are ideal for an Interstate application. Most still require shore power whereas my biggest break-in concern would be while boondocking or stopped in a parking lot for lunch (= the scenario in which the Wendlands got broken-into, and if I'm remembering correctly, one Interstate owner on Air Forums got broken into while daytime-parked near the St. Louis Gateway Arch). We have not yet gotten into the issue of how one might be adapted to run on its own battery or 12V. That's lower down on our current priority list and I'm hoping that the market will produce more choices before we even get to it.

The other limitation is that some of the security devices would be triggered by movement of our 45 pound dog if she were left inside the vehicle, such as during lunch. The manufacturers seem to have solved that issue on the conventional fixed residential side, but not with the more portable devices.
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Old 06-02-2016, 08:37 AM   #22
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For security I have a Compustar coupled with a dronemobile. I set the inside motion detector to compensate for my dog so the alarm will not go off. I get notified by email and text message of any issues. I can set or unset alarm anywhere there is cellular. It has GPS tracking It also has a temperature monitor but it is not as accurate as the temperature alert. I heard some people have coupled video to the device off of Facetime.
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Old 06-05-2016, 10:47 PM   #23
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Amg, I had an A/C problem much like you described. I'm not sure of the year of your AI--mine is a 2014. There was a resistor in the Dometic A/C roof unit that was defective and requiring too much current so it would not start up and only the fan would work. It got progressively worse. Eventually "Lewster" warrantied out the defective A/C unit. I hope this information helps.


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Old 06-05-2016, 11:17 PM   #24
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If the fan comes on but the compressor won't, could it be a mis-wired thermostat?
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Old 06-05-2016, 11:28 PM   #25
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If the fan comes on but the compressor won't, could it be a mis-wired thermostat?
It is almost impossible to 'miswire' a Dometic t/stat as they use 4 conductor phone cable with rj-11 jacks on either end. They simply plug in at the t/stat and control board.

It is highly likely that you have either a blown start capacitor, PTCR motor start device or both. If either is burnt, BOTH should be replaced.

If neither is defective, problem would most likely be the control board not energizing the K-5 relay which is responsible for sending 120VAC to the compressor. This requires a board replacement. The final option is a bad t/stat. Any competently trained and experienced RV tech with Dometic certification should be able to diagnose the problem in less than 15 minutes!
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Old 06-06-2016, 04:08 PM   #26
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Thanks for help.

I did follow advice to wait until all the lights were lit on generator panel and everything has been fine since. When LEW gets back to Florida I plan on having lithium batteries installed with upgraded solar panels. Hoping to being able to get a few hours use of A/C without running generator to keep my dog cool. What a life she has!
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Old 06-06-2016, 11:31 PM   #27
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Thanks for help.

I did follow advice to wait until all the lights were lit on generator panel and everything has been fine since. When LEW gets back to Florida I plan on having lithium batteries installed with upgraded solar panels. Hoping to being able to get a few hours use of A/C without running generator to keep my dog cool. What a life she has!
You sure won't be the first Interstate owner who has put in a large lithium bank and hybrid inverter with solar for the sole purpose of keeping their pooches cool and comfy!! They also don't seem to like it when the generator is running either!!
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Old 06-22-2016, 07:47 PM   #28
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Generator A/C question

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Something strange is happening with A/C. I turn on my generator (control located above front cabinet). I then walk to the rear on turn on the A/C. The unit will come on. I know I have to wait for the generator to be ready to turn on the compressor. It normally takes a few minutes. Lately the compressor never comes on. I notice all the lights on the generator are lit showing the A/C is being powered. However if I then turn the A/C off and then on the unit will cycle properly with the compressor. I keep a dog in the van and am concerned that the compressor will not turn on properly. Is something wrong or am I doing something wrong? Thanks

After saying back in May that I haven't had this sort of problem - I now have to eat my words. Yesterday I tried to use the A/C with generator power and it wouldn't work properly. I waited until the PCS panel was properly lite after the generator was running for about 2 minutes. Then I turned on the A/C and it started normally. But once the compressor started it overloaded the PCS and all power was shed by the PCS. Then the PCS went through another 2 minute delay before restoring power. It did this repeatedly about five times before I gave up to try something different. So I switched off the Magnum inverter/charger circuit breaker on the AC distribution panel. That seemed to work and the A/C functioned normally on the generator. I'm inclined to think the 120VAC load of the larger MS-2000 inverter/charger I installed last fall is just enough to overload the 20 A limit of the PCS Generator mode when running the A/C. This larger charger does draw more power than the original 1,000 watt Magnum inverter/charger.

This was the first time I tried running the A/C off the generator since I installed the larger inverter. I'll have to investigate further to be sure this is the problem. I've been using the A/C every day without issues while plugged in for the last few days on our trip through the hot Midwest.

More details on the problem once I get back home in July.


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