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Old 07-12-2019, 06:52 PM   #1
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AC maintenance

I decided to clean the Coleman AC units on the RV. I was pleasantly surprised at how clean they were after 3 years. Cleaned them anyway. I checked the air temp coming from each unit inside the RV. Bedroom was 66 degrees, front unit was 67 degrees output. I thought I had read somewhere that the AC output should be in the 55-60 degree range. Any thoughts on this? Thanks in advance.
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Old 07-12-2019, 07:23 PM   #2
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Go to the thread below. I have done almost every mod described in the thread. My vent temps went from 65 degrees to the low 30's. Some great ideas.

Try this first before you buy 2nd AC unit or bring your unit in for AC service.
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Old 07-12-2019, 08:14 PM   #3
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Yep do what FunMP said.

IMO it should read around 42 - 45 deg. But some have it down to 37 deg and other around 48 deg..... But all of them are much cooler than what your seeing.

Let us know what you find out.
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Old 07-12-2019, 10:38 PM   #4
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Thanks guys, will do.
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Old 07-12-2019, 11:47 PM   #5
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A/C discharge temperature is a function of input air temperature. You should see approximately 20 degrees of temperature drop.

Additional information - https://www.airxcel.com/coleman-mach...-support/faqs#
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Old 07-13-2019, 04:06 AM   #6
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Sweetbriar- I understand the 20 deg drop is a moving target. 20 degrees below the input air which is the air inside the RV returning to the AC unit.- not outside airtemp.
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Old 07-13-2019, 02:47 PM   #7
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Yes, inside temp.

Last year when I was working on my AC unit everyone was saying "outside temp". But while I was working on it I knew that did not make sense ..... it sucks the air from "inside" the RV to cool it.

I say if you get your AC vent temp gauge to read in the low 40's your good to go. Some might get 37 deg but im always afraid it will frost up under high heat/high humidity conditions.
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Old 07-14-2019, 07:48 AM   #8
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Quote:
Originally Posted by Hooligan2 View Post
Sweetbriar- I understand the 20 deg drop is a moving target. 20 degrees below the input air which is the air inside the RV returning to the AC unit.- not outside airtemp.
It's a a general indicator and not a hard number. Measure air temp at the closest return and discharge vents to the unit using the same thermostat. Depending on both the exterior/interior humidity and temperatures a couple of degrees of change up or down isn't out of the ordinary. Call it +/- 5 degrees.

Excessively cold discharge air isn't the best measure of system performance either. A balance system will both condition (pull the humidity out) and cool the coach. If the A/C is too cold you'll get the cooling but not the conditioning and the coach turns into a cave, cold and damp.
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Old 07-14-2019, 12:27 PM   #9
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Quote:
Originally Posted by Sweetbriar View Post
It's a a general indicator and not a hard number. Measure air temp at the closest return and discharge vents to the unit using the same thermostat. Depending on both the exterior/interior humidity and temperatures a couple of degrees of change up or down isn't out of the ordinary. Call it +/- 5 degrees.

Excessively cold discharge air isn't the best measure of system performance either. A balance system will both condition (pull the humidity out) and cool the coach. If the A/C is too cold you'll get the cooling but not the conditioning and the coach turns into a cave, cold and damp.
Good to know.
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