ac temp.

marcsbigfoot20b27 wrote:
You guys saying 14-20 must be talking residential AC.
I just went out to my trailer 13,500 btu, ambient temp 74 F outside, important for condenser cooling.
Inside trailer 80 F. Turned AC on max, intake air at filter 74 (after 5 minutes) cold discharge air was 42 F. Switched to low fan, 38F. Both were dropping every minute.

That of course was at 8% humidity.

Car, RV, or residential doesn't make any difference.

You put a thermometer at the intake of the unit. Then put the same thermometer at the output. Normal is a 14 - 20 degree drop. This should be done after it has run for a while and temperatures have stabilized.

marcsbigfoot20b27 wrote:
You guys saying 14-20 must be talking residential AC.
I just went out to my trailer 13,500 btu, ambient temp 74 F outside....important for condenser cooling.
Inside trailer 80 F. Turned AC on max, intake air at filter 74 (after 5 minutes) cold discharge air was 42 F. Switched to low fan, 38F. Both were dropping every minute.

That of course was at 8% humidity.

While the ultra low humidity plays a huge part, even with that a drop of that much indicates air recircualtion. The new R401 (on edit- that's R410a, not R401) units average in the upper teens, older R22 units were 20. More if dry, less if humid.

beemerphile1 wrote:
The temperature differential between incoming air and outgoing air should be 14 to 20 degrees.

A properly running A/C unit should have a
temperature difference of approximately 16 to
22°. Slightly lower temperature differences
are possible under extremely humid
conditions. (The unit may have to run longer
to remove moisture.) Greater temperature
differences than 22° are possible in hot dry
weather
You MUST have ambient temps over 75 degrees to do this type test. Doug

You guys saying 14-20 must be talking residential AC.
I just went out to my trailer 13,500 btu, ambient temp 74 F outside....important for condenser cooling.
Inside trailer 80 F. Turned AC on max, intake air at filter 74 (after 5 minutes) cold discharge air was 42 F. Switched to low fan, 38F. Both were dropping every minute.

That of course was at 8% humidity.

Thanks guys I will let have to check it

The temperature differential between incoming air and outgoing air should be 14 to 20 degrees.

We usually think of A/C performance as "split." Split means how much lower the discharge temperature is below the return air temperature. Others may have better numbers, A/C on when your stored RV is 100* inside. If it's discharging 80* that's a good split. But if you want it to be 70* in your RV, you won't see 70* discharge air till the whole thing is cool enough inside for the return air to be 90*.
Depending on how much you've used the RV and where, you can get some split back by cleaning the unit. Here's How.