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Old 07-21-2017, 10:40 AM   #11
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Originally Posted by johnsoax View Post

Will need to research how the EMS works with a 50Amp vs 30Amp service, as the 50 amp has two legs of power (240V vs 120V). You could have potentially had a low voltage on only one leg that caused the A/C issue, but didn't bother the EMS trip circuit.
It will shut down if either leg drops.
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Old 07-21-2017, 10:40 AM   #12
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Reading the manual, it looks like it shuts down power if the voltage is under 104 or above 132. You will have to check your A/C manual to see if 104 is in the operating range it wants... Normally when you lower voltage, you raise current to do the same "work"... But the A/C could have a voltage protection circuit that doesn't let the compressor run under a certain voltage.
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Old 07-21-2017, 10:45 AM   #13
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But the A/C could have a voltage protection circuit that doesn't let the compressor run under a certain voltage.
That is also 103-104
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Old 07-22-2017, 11:44 AM   #14
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Your rig is 29 foot. It is on the large size for a single air conditioner to keep up. These rigs are big boxes, poorly insulated, and surrounded by heat. Your orientation to the sun also makes a difference. If your 90 degrees toward the sun you have a much greater greenhouse effect than if your inline with the sun, with the exception of the windshield if you have one. Block the sun as much as possible. Windows are a major solar collection array. Good luck with it.
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Old 07-22-2017, 01:22 PM   #15
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We had our rig down in Michigan at the beginning of June during an insane heat wave (insane to my Canadian self, maybe not you Southern folk). We were parked in a driveway in full sun. They day we arrived it was 90* according to my truck, and disgustingly humid on top of that. I plugged into 30amp and the 13.5K BTU air conditioner had my trailer cooled down to 75 within a half hour and water was pouring out of my gutter spouts. I do not have the thermal package. Your trailer has greater internal volume than mine but I think there is a problem with yours. Maybe pull the cover off the AC and check to make sure nothing is nesting in there and plugging up the condenser? Or maybe there is a freon leak?
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Old 07-23-2017, 12:40 AM   #16
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I would check that the vents arent leaking cold air into the roof. I would have to say that's not really what you should expect. If it can't cool you down more than 4 at 86 outside temp than there is something not right. It might have a great 20 drop but if some of those vents are leaking into the roof then you don't have the volume. 20 drop is great but you need more than a tickle of air.
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Old 07-23-2017, 08:00 AM   #17
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I am on the side that if the voltage was good enough for your EMS to keep engaged then the unit should cool. My EMS was going off for an hour last weekend due to low voltage once everyone kicked on coffee pots and micros during breakfast and dinner. My display read 94 volts at one point.

Without protection like an EMS an A/C could permanently die. With protection you just loose power and it needs to cycle again once power is restored to your unit through the EMS.

The A/C's have a timed restart built into them once they shut down and if they continually get shut down it would result in a hot camper.

Every model is going to have it's challenges when it comes to cooling and heating. For starters the vent array and setup will make a difference with air flow. Consider adding vents into the unit down stream and closing others off closer to the supply.

Do you have a whisper quiet setup? Is the air dam separating the return from the flow air shifted or leaking? They are only a rigid piece of foam in most.

Are your filters clean?

Do you have a black A/C roof cover? Check out the reflectix mod on this forum for your air box. I did this and my unit is 3-4 degrees cooler for it.

There is a laundry list of checks, but start with the source and vents.
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Old 07-27-2017, 03:21 PM   #18
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In full sun, running only one of our two A/C's cannot keep up with the heat load when the temps are over 95F. We run two of them most of the day in those conditions. It does help to put the awning out when the sun is hitting that side of the trailer. Also, we are set up for 50A service.
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Old 07-27-2017, 04:30 PM   #19
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20 degrees cooler is pretty much the industry standard, give or take.

One AC in a big camper won't do as well as 2 AC's. I have a 29QBS with 1 15K AC, didn't want to upgrade to 50amp and 2 units. During the day try to block windows to reduce solar heat gain. Reflective window covers will help quite a bit. Campers aren't very efficient, you have to make the best of what you've got.

Good luck.
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Old 07-28-2017, 02:41 PM   #20
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Quote:
Originally Posted by SkyBound View Post
We had our rig down in Michigan at the beginning of June during an insane heat wave (insane to my Canadian self, maybe not you Southern folk). We were parked in a driveway in full sun. They day we arrived it was 90* according to my truck, and disgustingly humid on top of that. I plugged into 30amp and the 13.5K BTU air conditioner had my trailer cooled down to 75 within a half hour and water was pouring out of my gutter spouts. I do not have the thermal package. Your trailer has greater internal volume than mine but I think there is a problem with yours. Maybe pull the cover off the AC and check to make sure nothing is nesting in there and plugging up the condenser? Or maybe there is a freon leak?
I stand corrected. I apparently have the 15K unit after some inspecting. My apologies for the misleading info.
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