Every Little Bit Helps with Your A/C

[dieselguy]

Others have mentioned doing this, but I was working on a fiver that needed that little bit of help, so I snapped a couple of photos. Remove the screws from the bonnet and the 4 lag bolts from inside the A/C pan. The roof unit will tilt to one side wire length allowing. Whoever on the assembly line taped up the return and supply duct cutouts beneath the A/C unit to seal them from the attic space might as well not bothered. I added to the OEM aluminum tape as shown to make it actually seal. Before I lagged it back to the roof ... I checked the divider between the return and supply air to be sure it was in place properly for sealing between the two as well. In this case ... it made a 4 degree difference in supply air temp by not sucking and blowing a bit of air from and into the attic space

[jameswbarton]

Thanks for the picture. You do not need to be very far off to allow the supply and return air to mix. Did you need a new gasket when you remounted it?

[dieselguy]

No new gasket for either seal ... unit was only 7 months out of the factory. If you look close on the first photo, the gasket between the supply and return is just left of the ID tag on bottom of A/C pan.

[DQDick]

Thanks! Filed those pics for future reference.

[jameswbarton]

I had trouble with my rear unit a Brisk 2 when it was new. The supply to return temp was a little low. Keystone authorized the dealer to remove and inspect the seal. The dealer reported it was fine? However when he retested the temperature it now was fine and I also tested it at almost 27 degrees. Owner relations guessed that the dealer inadvertently fixed it. I was wondering what it looked like if I ever needed to check it myself as it is now out of warranty. Your needed better taping comment bothers me and maybe I will try to fish a video camera up the ducting.