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Old 05-14-2013, 09:06 AM   #1
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Installing A/C on an '85

Hi Everyone, I have come across an older Dometic A/C unit that I can purchase & was wondering the process involved in installing this. The unit is model SL135R-B and I am looking to put it in a 1985 22 foot Sunline. My ceiling vent in the kitchen has a outlet right next to it stating it is for air conditioning. IS this as simple as taking off the vent cover, putting the unit on top of the vent & plugging in? I came here because I imagine that nothing is that simple. As always, your help is greatly appreciated.
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Old 05-14-2013, 10:42 AM   #2
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Since your Sunline was pre-wired for A/C, that would also mean that the roof in that area is also built strong enough to hold a rooftop unit. Installing an A/C isn't too terribly difficult, but there are still precautions to be taken. Your unit being an 85, I would also tend to think that the roof is strong enough to walk on. I would test the roof, before committing my full weight on it. The post-1995(?) units came with a rubber roof, that was not meant to be walked on. There is a procedure HERE that explains how to properly distribute your weight, should your roof not be up to it.

As far as installing the A/C itself, I did an install on our fifth wheel. It was also pre-wired for an air conditioner. The process won't be exactly like mine, but you should be able to glean enough useful information to be a help.

2nd Air conditioner install... With pics!
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Old 05-14-2013, 12:59 PM   #3
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That is great information, with the pictures. Thank you for that! I can walk on my roof & have been up there last year to seal all the seams. I had thought that the air conditioning just plugged into an outlet, but that is obviously not the case. So now I am a little leery because I thought I would be able to hear this run before purchasing.
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Old 05-14-2013, 01:17 PM   #4
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[QUOTE][So now I am a little leery because I thought I would be able to hear this run before purchasing. /QUOTE]

If the controls/thermostat are built into the unit, you could temporarily wire a plug onto the 120v wires to see if it works.

It's fairly simple if the wires are identified....

Hot (Usually black or red) to gold/brass screw, Neutral (white) to silver screw, Ground (green) to green screw.

Mack
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Old 05-14-2013, 05:15 PM   #5
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If you remove the trim piece for your vent from the inside you maybe able to see the wiring tucked up under the trim. If there is a 20 amp breaker it most likely is pre wired. It will have to be hard wired (no plug) but it's pretty simple job. You'll need the gasket kit also if it's a used unit but they are only about $20.
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