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Old 08-10-2022, 03:17 PM   #1
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Air Conditioner check

Is there any way to check the operation of the A/C unit on a 2018 Flagstaff 25brds? Is there a standard for the temperature of the output air temp? Or the temperature drop? I think it's a 13000 btu unit. With the extreme heat I wasn't sure if the unit was working correctly. It sounded good but when it was shut off for a short time to listen to the microwave and the water pump it took 2 minutes to restart.
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Old 08-10-2022, 03:28 PM   #2
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expect 15 deg temp difference inside camper vs outside air temp.
a little more if nobody opens the doors.


when first starting you may need to knock down the humidify inside before you feel that temp difference.
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Old 08-10-2022, 03:30 PM   #3
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Generally, an A/C unit can reduce air temp by around 20F. It can be more or less depending on humidity as well. This would be measured at the outlet vents closest to the unit.
The restart timing you mentioned would be considered normal; many A/C units have a restart delay to avoid damage due to pressures after a shutoff. You can google that delay to get technical details if you're interested.
HTH

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Old 08-10-2022, 04:42 PM   #4
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Would it be any different between a 13000 and 15000 btu unit
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Old 08-10-2022, 04:49 PM   #5
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Would the temp. difference be outside temp. to inside temp. or temp. at intake and discharge of air conditioner?
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Old 08-10-2022, 05:05 PM   #6
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Quote:
Originally Posted by jrctoby View Post
Would it be any different between a 13000 and 15000 btu unit
BTU rating can be thought of as how many thermal units can be moved from inside the RV to the outside. Larger area, more BTUs; smaller area less BTUs. Overall, a higher rated unit will cool better.
An A/C unit has to remove heat from an area. Grab it and throw it outside. It's not just a matter of pumping cold air in, it has to remove the hot air.
Given the same size area, a larger BTU unit will cool a bit faster by removing more hot air in the same time frame.
My feeling is that unless you have really high heat and/or humidity, there isn't a big difference between the two although the 15K will possibly provide a perceived increase in cooling.

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Old 08-10-2022, 05:44 PM   #7
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Quote:
Originally Posted by jrctoby View Post
Would the temp. difference be outside temp. to inside temp. or temp. at intake and discharge of air conditioner?
So the unit is taking in air at a certain temp from inside the RV. It is trying to remove the heat from that air and dump it outside. As the temps in and outside rise, the unit has to work harder.
But the unit can only shed heat to the outside, so the overall reduction is going to be relative to outside temps. If it's 95 outside, don't expect it to get to 65 inside; 75 would pretty much be a low limit.
If the air inside the RV is temporarily hotter than ambient (think been closed up all day in the sun for example) the unit can probably drop that temp down more than 20F as long as the ambient is crazy hot.

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Old 08-10-2022, 06:37 PM   #8
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Thanks for the great info. I am having trouble explaining why the camper we were looking at wasn't getting to 72 degrees after an hour or so when it was in the sun and 93 outside. I think this info will help with the explanation.
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Old 08-10-2022, 06:47 PM   #9
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Has everything to do with heat and humidity. Look up latent heat of vaporization and latent heat of condensation. It will tell you how many btu's are consumed to remove a gram of water from the air with NO temperature change. That's how AC works. ( air conditioning 101 )
Compressor type dehumidifiers help a lot to improve your comfort. As was previously stated. Inlet temp Change to outlet temp won't be much more than 23* at best. Circulating fans are a must.
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