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Old 06-12-2014, 08:34 PM   #1
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1994 34' Excella
Kalamazoo , Michigan
Join Date: Mar 2014
Posts: 69
Adding second ac unit in rear br

Is there a thread somewhere describing adding an ac unit where the vent in the rear bedroom is? We have a 94 Excella classic 34 rear queen. Thanks...

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Old 06-13-2014, 08:58 AM   #2
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1978 31' Sovereign
Texas Airstream Harbor , Zavalla, in the Deep East Texas Piney Woods on Lake Sam Rayburn
Join Date: Jan 2003
Posts: 2,435
Images: 292
You might take a look at my re/mod thread ('78 31' Sovereign) . In post #86 I glossed over the installation.....sure could have done a better job of explaining how it was done. In summary, remove the rear vent, reinforce the area surrounding the vent, be sure to use a good drip pan, route the drain line down the black tank vent line.

I had previously installed a separate 20 amp 110 volt service for an electric/gas water heater, so I also installed a 110 volt selector switch from an RV junk yard.

You will probably have to trim the rear vent just a bit. The original AS vent had rounded corners.

Most difficult task was getting the new unit up on the roof. Two good ladders and two strong friends willing to work for beer took care of that. Use PLENTY of good sealant - you only get one shot at preventing leaks between the pan and the roof.

The drip pan that I used from AS came with some sort of neoprene that was used to raise the unit off of the drip pan. I positioned the neoprene on the ribs to better support the weight of the AC.

PM me if you require further explanation.


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Old 06-14-2014, 09:54 PM   #3
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1987 32' Excella
Nepean , Ontario
Join Date: Mar 2006
Posts: 1,009
The challenge will be changing your street connection from the 30-amp one to what is referred to as 50 amp, which is really 220 volts. This means that you will also need to have an A-B switch set up to select which a/c unit will run when you are on 30-amps.

This is definitely a job for a qualified electrician. I had had something of this nature done when I had a 1994 LY motorhome, which had only a 30-amp shore power, but also had a 6500 watt genset and 2 air conditioners. I do have a copy of the revised circuit diagram. BTW, it also had to have the ATS (automatic transfer switches) rewired to provide a 60-second delay to protect the a/c motors. See
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