Originally Posted by Xtrmtj
Great mod Herk....I will put it on my to do list for sure. It can probably help keep an AC from freezing up if you have to run it on high for an extended period of time to cool a camper right??
Xtrmtj, if your unit is freezing up there are things that you can check,
#1 check your return air temp. You should get between 15 and 17 degrees difference in your supply air. If to say that your trailer is 80 degrees inside the coldest air would be around 65 degrees coming out. It's called delta T
#2 Do not close down registers if is ducted system to force more air to another area. The reason is that you have to move the correct CFM over the coil or you will freeze it up. Remember these are only 4"ducts.
#3 Start the unit early to try and keep up with the heat, that's to say the hotter inside the warmer temp you going to get out and it will take a lot longer to bring it down.
#3 Being low on freon is a big one, you can cool great until it gets hot out then you drop in capacity and you will freeze the evaporator coil once it starts the only way to defrost it is to turn the unit off.
#4 As your inside temp drops the cooler the air will be
#5 you should not run the a/c when the night temp drops below 60, it will not allow for the heat transfer
If you are still freezing then you need to see an A/C person to check. and most of all make sure your return air filter is clean and not blocking the air flow back to the unit.
#6 Rule of thumb never close more 1/3 of the registers, this creates a higher static pressure which will really slow you blower down. I would recommend
1 or 2 only.
I hope some of these tips help, if not throw then away......