Semi-technical AC question

[KAttkisson]

I have a 2009 Freelander with Ducted AC as well as the grill over the AC allowing direct flow into the camper.

When I had the grill/return filter off for another reason the other day I noticed that someone before me had purposefully opened a passage between the discharge and return. Why would someone do this? Common sense would say repair it but why would it have been done? I'm afraid to correct until I find out.

[TURBS]

Should be totally blocked off


2015 Columbus 320RS
2008 2500HD Duramax
2015 nights camped "34"

[R3Jones]

Originally Posted by TURBS

Should be totally blocked off


2015 Columbus 320RS
2008 2500HD Duramax
2015 nights camped "34"

I agree. This short circuiting can cause a freeze up situation.




-R.Jones
Nitro 31FQSL

[Duckogram]

That makes no sense. The return air must be isolated from the discharge outlet. Sound like old Knuckles McGirk was at it again.

[bob caldwell]

Reneck thermostat?

[Witch Doctor]

Some people think that it will cause a lower delta T between the R/A and the Supply air. The thinking it will cool the trailer down sooner. Will not happen. In fact it will take longer being an A/C is only a large dehumidifier. Some units come with a sensor on the evap coil , what will happen is that you would freeze the coil sooner. Also some do not have a sensor. If you don't have a heat load and the outside amb. air drops you will freeze that coil. Close it up, you can't cure stupid but you can correct it.

[Bama Rambler]

In a previous RV there was several 'leaks' between the supply and return air plenum. I used insulated foam duct tape to seal them up and after that the unit cooled much better and we had no more freeze-ups.