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06-11-2007, 07:35 PM
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#1
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New Member
corpus Christi
, Texas
Join Date: Nov 2006
Posts: 1
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Installation of second A/C 34'Excella
Our 34'Excella has one A/C that seems to be working properly but is not able to keep up with 100deg heat in the Texas summers. Is it difffcult to install a second A/C in the rear roof vent. Is there 120v wiring at the roof vent. I plan to install a second 30 or 50 amp service. I do not believe swaping to a 15,000 btu A/C would be enough.
Thank you
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06-11-2007, 07:43 PM
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#2
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Rivet Master
1999 34' Excella
Joshua
, Texas
Join Date: Apr 2002
Posts: 548
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2nd A/C
You can add the 2nd unit in the bedroom roof vent, but the 2 problems/challenges are the drain line and 120v power. There is 12v to the roof fan, but not 120v and no easy way to route the drain line in the exterior walls. I had the same situation on our 34' and decided to replace our 13.5 unit with a 15k unit and have been very happy. I did install a larger breaker panel and 50amp service and Marinco 50amp socket.
__________________
History doesn't repeat itself, people do!
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06-25-2007, 12:34 PM
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#3
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Rivet Master
1983 34' Excella
1967 24' Tradewind
Little Rock
, Arkansas
Join Date: Nov 2006
Posts: 3,825
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Overheated 34 footers
Quote:
Originally Posted by Dwight
You can add the 2nd unit in the bedroom roof vent, but the 2 problems/challenges are the drain line and 120v power. There is 12v to the roof fan, but not 120v and no easy way to route the drain line in the exterior walls. I had the same situation on our 34' and decided to replace our 13.5 unit with a 15k unit and have been very happy. I did install a larger breaker panel and 50amp service and Marinco 50amp socket.
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Hi Dwight,
I'm pretty much melting here in Little Rock and summer is just starting. The existing 13.5 unit struggles to keep the inerior the same temp as the exterion in the sun, and I have zero shade. What temp diferential are you getting in the sun with the 15k unit, and which model did you buy?
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06-25-2007, 01:43 PM
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#4
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Rivet Master
1999 34' Excella
Joshua
, Texas
Join Date: Apr 2002
Posts: 548
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model..
I had the Dometic Penguin heatpump and replaced it with the same unit, a 15k instead of the 13.5k. I believe that Dometic only says they will cool to 20 degrees cooler than OAT. The 13.5k was "acceptable", but I had the opportunity to change to a 15k. The 15k seems to cool the same just on the low fan speed. If you currently have a "4 button" t-stat, then you will have to upgrade to a "5 button" t-stat if you install the 15k unit.
Dwight
__________________
History doesn't repeat itself, people do!
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06-25-2007, 02:01 PM
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#5
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Rivet Master
1991 34' Excella
Princeton
, New Jersey
Join Date: Aug 2003
Posts: 7,070
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Dwight
What is the current draw on the 15 and are you running it on the #12 wire that originaly feed the 13.5?
__________________
WBCCI 12156 AIR 3144 WACHUNG TAC NJ6
2004 Excursion 4x4
1991 34 ft. Excella +220,000 miles, new laminated flooring, new upholstery, new 3200 lbs axles
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06-25-2007, 03:17 PM
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#6
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Rivet Master
1983 34' Excella
1967 24' Tradewind
Little Rock
, Arkansas
Join Date: Nov 2006
Posts: 3,825
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T-Stat
Quote:
Originally Posted by Dwight
I had the Dometic Penguin heatpump and replaced it with the same unit, a 15k instead of the 13.5k. I believe that Dometic only says they will cool to 20 degrees cooler than OAT. The 13.5k was "acceptable", but I had the opportunity to change to a 15k. The 15k seems to cool the same just on the low fan speed. If you currently have a "4 button" t-stat, then you will have to upgrade to a "5 button" t-stat if you install the 15k unit.
Dwight
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Thanks Dwight,
Sounds like your Dometic was cooling better than my old Coleman. As for the t-stat, mine is a 1983. I have a knob on the unit itself. I am considering installing a wall unit as discussed in other threads.
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06-25-2007, 04:19 PM
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#7
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Rivet Master
1999 34' Excella
Joshua
, Texas
Join Date: Apr 2002
Posts: 548
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current draw...
I am not sure what the current draw is, I will check it and get back to you with the figure. I am using the same wire with the 15k, all I did was add a new drain pan (which you can get from Dometic for about $49 made for Airstreams) and connected the wiring. I also bought a new inside ceiling duct and grille to have it match the new rooftop unit.
Dwight
__________________
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