Forum Discussion

profdant139's avatar
profdant139
Explorer II
Jul 16, 2021

Does closing most A/C vents create back-pressure?

We have a very small trailer and a fairly big a/c unit -- over 13,000 BTUs, I think. (That's the way the trailer was equipped.) It gets cold in a hurry in there, which I personally like. But DW does...
01tundra's avatar
01tundra
Explorer
Jul 22, 2021
If you close too many vents you restrict airflow across the evaporator coil.

If you restrict air flow across the evaporator coil the evaporator coil will start to freeze up.

If you freeze up your evaporator coil you run the risk of slugging the compressor with liquid refrigerant because it doesn't have a chance to flash to a gas in the evaporator.

If you slug the compressor you run the risk of it failing.

Now your too high of airflow problem is fixed because you no longer have an operating AC unit.

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