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Old 07-15-2015, 06:32 AM   #31
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My dash ac is pretty much useless when the engine is hot. Between the heat from the windshield and the engine heat I get very little from it. Anyone else find this to be true?
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Old 07-15-2015, 08:19 AM   #32
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Mine works well. I keep it on coldest setting with Max AC and rarely turn the fan beyond the first or second setting. Kept cool driving in mid 90 ambient temps. Keep in mind however that we always run the gen and roof AC's while driving as well.
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Old 07-15-2015, 01:16 PM   #33
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Yep anything above 85* dash air can't keep up. Like AugerN said...using the gentec & rv air keeps it very comfortable. Prior to leaving in the mornings we run the rv ACs to try to lower the coach temp. Then as soon as we start the motor, the dash AC goes on. Any stops during the day we turn on the gen & house air while we are away. That way the dash AC isn't trying to catch up. We also pull shades to meep the suns rays from heating the interior.
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Old 07-16-2015, 08:46 PM   #34
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Good discussion everyone. Thanks. Before departing on a trip, we plug in our Precept and run the A/C and Fridge overnight. Typically we'll leave in the morning and the coach is cool inside and as Darrell said, the Dash A/C just blends in and we stay cool.

We live in Florida and manage heat reflection as much as possible.

Going to incorporate the vent management Darrell shared. That should help even more.
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Old 07-16-2015, 10:37 PM   #35
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I noticed on my recent 2000 mile trip in my 29UM that when both air conditioners were running after a long leg in hot weather, I would have trouble. One would turn off after reaching desired temp. But when it tried to restart, it seemed it couldn't overcome the inrush startup demand, causing the converter to click and kill power to both air conditioners. once I cut them both off then started only one of them, all was fine. Now I had previously installed hard start capacitors to both AC units. I bet if I didn't have them, I would probably not been able to start either. There seems to be a lot of heat building up under the coach during extended hot weather driving from a combination of the road, engine, and generator that is evident when you run some cold water...and it comes out piping hot. My total guess as a non-electrician that this heat is effecting the ability of the generator to run both AC units.
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Old 07-17-2015, 07:01 AM   #36
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Tell me more about the hard start capacitors. What's the need/benefit? And is it something the dealer did or you did?
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Old 07-17-2015, 03:26 PM   #37
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Quote:
Originally Posted by Cycledoc675 View Post
I noticed on my recent 2000 mile trip in my 29UM that when both air conditioners were running after a long leg in hot weather, I would have trouble. One would turn off after reaching desired temp. But when it tried to restart, it seemed it couldn't overcome the inrush startup demand, causing the converter to click and kill power to both air conditioners. once I cut them both off then started only one of them, all was fine. Now I had previously installed hard start capacitors to both AC units. I bet if I didn't have them, I would probably not been able to start either. There seems to be a lot of heat building up under the coach during extended hot weather driving from a combination of the road, engine, and generator that is evident when you run some cold water...and it comes out piping hot. My total guess as a non-electrician that this heat is effecting the ability of the generator to run both AC units.
Sounds very logical Cycledoc. I would also be interested in the capacitors.
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Old 07-18-2015, 07:11 AM   #38
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Installing Hard Start Capacitor into my RV Air Conditioner
RV Air Conditioner Hard Start Capacitor | ModMyRV
Hey guys. The AC units on our Precepts are basically Coleman Mach 3 units distributed by AirXcel. If you were to buy the unit off the shelf, you would likelyi have the hard start capacitor. But OEMs tend to eliminate them to save a few dollars. The good news is that they are CHEAP and VERY EASY to install. I was trying to see if I could start and run an AC unit off of a 2500 watt inverter generator as a backup, but I could still never get it to work....I suppose because the Progressive Dynamics IntelliPower converter in our units simply would not respond fast enough to the surge demand to ramp up my generator fast enough. Look at the 2 links and see what you think. There is an "E" type and a PTCR type as well. I installed the E in the front unit and the PTCR resistor type in the rear unit....can't tell the difference. They both anecdotally seem to start easier.
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Old 07-18-2015, 07:21 AM   #39
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Safety tip from an old electronic tech, CAUTION : Never put your hand across the terminals of a large capaciter. They store energy and can give you a Start too!
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Old 07-20-2015, 07:42 AM   #40
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Again pardon my lack of knowledge but what is the benefit of the capacitors and what is the downside to not installing them? Is it just that repeated hard starts are bad for the overall longevity of the units? And what conditions might cause a hard start? All I notice is that the AC units kick on. I have not noticed any difficulty starting up.
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