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Old 01-11-2016, 06:06 AM   #1
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Semi-technical AC question

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.

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Old 01-11-2016, 06:31 AM   #2
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Should be totally blocked off

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Old 01-11-2016, 06:50 AM   #3
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Originally Posted by TURBS View Post
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.

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Old 01-12-2016, 09:42 AM   #4
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That makes no sense. The return air must be isolated from the discharge outlet. Sound like old Knuckles McGirk was at it again.
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Old 01-12-2016, 09:51 AM   #5
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Old 01-12-2016, 10:43 AM   #6
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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.
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Old 01-12-2016, 10:48 AM   #7
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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.

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