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Old 07-26-2010, 09:46 AM   #1
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Question Switching out AC unit..hard?

I have a 31 foot MH with AC ducting...Ordered 15K Coleman to replace original 13.5 K Coleman/compressor dead unit. New one comes with "top and bottom parts." Will it be hard to install?...any pre-installation advice/recomendations. I can back my MH next to stairs up to 2nd story porch, so I think that is how I will get new unit on to RV roof. Hope 2 normal size guys will be able to lift it up and over porch rails to roof.

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Old 07-26-2010, 12:27 PM   #2
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Two people will have no problem. 15 years ago my wife and I put ours on the roof with two ladders and a plank. She was Cranky ,but did it. Gotta love her.


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Old 07-26-2010, 12:38 PM   #3
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A few years ago I replaced an older roof top AC with a newer model. I did it by myself but it would have been GREAT to have had some help. Be sure to clean the old gasket off and replace it with a new gasket. After all that work you don't want water seeping in when it rains. It was pretty straight forward on mine - I removed the inside vent/grill and there was a connector box for the AC wires and the bolts securing the A/C. I disconnected those wires, and the inside bolts that hold the AC down. I was able to lift the old one out and put the new one in. My A/C did not have a wall thermostat so I did not have those wires to "mess" with. I placed a couple pieces of card board on the roof as a cushion for the old and new units. I could slide the cardboard and move the A/C's without damaging the roof material.
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Old 07-26-2010, 12:52 PM   #4
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You have stepped up in BTU's and power draw. What is your circuit breaker size?
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Old 07-26-2010, 04:27 PM   #5
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Thanks for the quick and great responses...am feeling more confident about my abilty to do job now...I have 30 amp service to coach, AC is currently on 15 amp circuit, will I need a higher amp breaker now? (this is only unit, but that is probably obvious because of ducted)
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Old 07-26-2010, 05:07 PM   #6
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Check the nameplate on the new A/C. New units are more efficient so you may not need a new circuit breaker.
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Old 07-26-2010, 05:23 PM   #7
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Old 07-29-2010, 01:58 PM   #8
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If you are replacing a ducted unit, make sure the "bottom part' you get is for a ducted system. They are not interchangeable. The standard "bottom" is typically the non-ducted one that has built in controls (on/off, etc).

Gary Brinck
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roof ac switch out

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