Home » Public Forums » GMCnet » AC Choices
| AC Choices [message #313018] |
Fri, 10 February 2017 20:56  |
SpookyEng
Messages: 208
Registered: June 2016
Location: Navarre, FL
Karma: -5
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Our 78 Royale is down at the Coop getting refurbished/repaired after the accident. The AC (2009 vintage) cools ok but drips water into the coach.The CoRV is getting a full repaint so I want to go ahead and replace it since it has to come out anyway. Living here in Florida, adequate A/C is a major priority! To that end I am seeking some input. Based on the 25ft toyhauler that was our previous RV, one 13.5k unit is marginal at best. I want cold AC and a minimum amount of noise. I only have 30 amp service and I am not sure if the coach is set up for two A/C's. Recommendations, suggestions?
JD Lisenby- USAF Ret
1978 Royale-455
MacDash, Manny Tranny, FI-tech, 3.70 etc etc
Navarre, FL
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| Re: [GMCnet] AC Choices [message #313026 is a reply to message #313018] |
Fri, 10 February 2017 23:07  |
Ken Henderson
Messages: 8726
Registered: March 2004
Location: Americus, GA
Karma: 9
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Senior Member |
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JD,
I've no suggestion for a particular A/C, but I don't think you'll ever get
enough cooling from one unit for FL. So, my suggestion is to add a
separate 120vac/15A circuit for the rear unit. I had to resort to that on
the 90 Airstream Land Yacht we once had. Just plug into both the 30A and
the 15A sockets on the power post. To cover the rare occasion when there
was only 50A available, I mounted 30A and 15A sockets in a box equipped
with a 50A plug. It worked out very nicely.
I didn't do it on that coach, but it would be easy to feed both circuits
from the Onan if necessary.
JWID,
Ken H.
Americus, GA
'76 X-Birchaven w/Cad500/Howell EFI & EBL,
Manny Brakes & 1-Ton, etc., etc., etc.
www.gmcwipersetc.com
On Fri, Feb 10, 2017 at 9:56 PM, Jdlisenby@hotmail.com <
jdlisenby@hotmail.com> wrote:
> Our 78 Royale is down at the Coop getting refurbished/repaired after the
> accident. The AC (2009 vintage) cools ok but drips water into the coach.The
> CoRV is getting a full repaint so I want to go ahead and replace it since
> it has to come out anyway. Living here in Florida, adequate A/C is a major
> priority! To that end I am seeking some input. Based on the 25ft toyhauler
> that was our previous RV, one 13.5k unit is marginal at best. I want cold
> AC and a minimum amount of noise. I only have 30 amp service and I am not
> sure if the coach is set up for two A/C's. Recommendations, suggestions?
> --
> JD Lisenby- USAF Ret
> 1978 Royale-455
> Electromotive Tec2 FI & ignition
>
> Navarre, FL
>
> _______________________________________________
> GMCnet mailing list
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Ken Henderson
Americus, GA
www.gmcwipersetc.com
Large Wiring Diagrams
76 X-Birchaven
76 X-Palm Beach
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| Re: AC Choices [message #313035 is a reply to message #313018] |
Sat, 11 February 2017 09:21 |
Scott Nutter
Messages: 782
Registered: January 2015
Location: Houston/San Diego
Karma: 4
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Senior Member |
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JD,
A second AC would be a huge improvement.
On my 78 Royale I have the rear bedroom. But the mistake I think I made was to put a 15K AC in the rear. It cycles too often, because of the small area. If I had it to do over, I would put a13k unit in the aft.
My fwd AC is a 15k Atwood, and is very quiet, my aft AC is a Coleman Mach 8, but not as quiet as the Atwood.
Scott.
Scott Nutter
1978 Royale Center Kitchen, Patterson 455, switch pitch tranny, 3.21 final drive, Quad bags, Dave Lenzi super duty mid axle disc brakes, tankless water heater, everything Lenzi. Alex Ferrera installed MSD Atomic EFI
Houston, Texas
[Updated on: Sat, 11 February 2017 09:25] Report message to a moderator |
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| Re: AC Choices [message #313036 is a reply to message #313018] |
Sat, 11 February 2017 09:25 |
JohnL455
Messages: 4447
Registered: October 2006
Location: Woodstock, IL
Karma: 12
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Senior Member |
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If you are running wire be sure it is minimum12 ga rated for 20A. Otherwise you will be over the 15A at start and right up to it at run. Granted the new units draw less than the Duotherms but you want as little voltage drop as possible when in already marginal campgrounds. If I rememer the last time I probed the larger Duotherm ran at about 16-17 Amps and the smaller around 13.5A. But that was years ago and CRS may factor.
John Lebetski
Woodstock, IL
77 Eleganza II
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| Re: AC Choices [message #313038 is a reply to message #313018] |
Sat, 11 February 2017 09:54 |
lqqkatjon
Messages: 2324
Registered: October 2010
Location: St. Cloud, MN
Karma: 5
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Senior Member |
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I think cooling is all about insulation.
I love my atwood 15.5k btu. It is a little uglier and bigger then a low profile unit. It cools well and you could run 2 on 30 amps. However fitment of a 2nd A/C in rear spot may take adjustments to rear lights and ladder rail. I think with tinted windows good insulation you can stay cool with one 15.5 atwood.
If i had a better looking coach, i would go with the coleman mach 8. It seems to be the lowest power consumption when it comes to a low profile unit. From what i have talked with people and read i think you can run 2 15.5btu coleman mach 8 on a 30 amp, but have not owned one myself.
Do not buy a dometic duotherm. Dometic dows have a new one out i know nothing about.
The above running 2 off 30 amp, means you may not be able to have them both on and microwave ect. My atwood uses very little power maintaining on low, but runs about 11-12 amps full blast startup. Monitoring it i never seen the amp meter get up to the max power they have as a spec rating.
Jon Roche
75 palm beach
EBL EFI, manny headers, Micro Level, rebuilt most of coach now.
St. Cloud, MN
http://lqqkatjon.blogspot.com/
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| Re: AC Choices [message #313040 is a reply to message #313018] |
Sat, 11 February 2017 13:54 |
dshafer
Messages: 68
Registered: June 2016
Location: SW Ohio
Karma: 3
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My '77 was already wired for the rear A/C. Fitment is not the best for some models though. There is a 14 x14 framework forward of the rearmost one but that is in my hallway and would need special consideration.
1977 26 foot 403
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| Re: [GMCnet] AC Choices [message #313041 is a reply to message #313035] |
Sat, 11 February 2017 14:09 |
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USAussie
Messages: 15912
Registered: July 2007
Location: Sydney, Australia
Karma: 6
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Senior Member |
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Scott,
IIRC GMC put an 11K BTU in the rear position.
Regards,
Rob M.
The Pedantic Mechanic
USAussie - Downunder
AUS '75 Avion - The Blue Streak TZE365V100428
USA '75 Avion - Double Trouble TZE365V100426
USA '77 Kingsley - TZE 267V100808
-----Original Message-----
From: Gmclist [mailto:gmclist-bounces@list.gmcnet.org] On Behalf Of Scott
Nutter
Sent: Sunday, February 12, 2017 2:21 AM
To: gmclist@list.gmcnet.org
Subject: Re: [GMCnet] AC Choices
JD,
A second AC would be a huge improvement.
On my 78 Royale I have the rear bedroom. But the mistake I think I made was
to put a 15K AC in the rear. It cycles too often, because of the small
area. If I had it to do over, I would put a13k unit in the aft.
Scott.
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Regards,
Rob M. (USAussie)
The Pedantic Mechanic
Sydney, Australia
'75 Avion - AUS - The Blue Streak TZE365V100428
'75 Avion - USA - Double Trouble TZE365V100426
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| Re: AC Choices [message #313045 is a reply to message #313018] |
Sat, 11 February 2017 14:59 |
Scott Nutter
Messages: 782
Registered: January 2015
Location: Houston/San Diego
Karma: 4
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Senior Member |
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Rob,
I think a new technology 11k AC in the aft would be perfect.
But who makes a quality new one?
Scott
I have my original stock rear AC in my garage. I will check the btu output on it.
Scott Nutter
1978 Royale Center Kitchen, Patterson 455, switch pitch tranny, 3.21 final drive, Quad bags, Dave Lenzi super duty mid axle disc brakes, tankless water heater, everything Lenzi. Alex Ferrera installed MSD Atomic EFI
Houston, Texas
[Updated on: Sat, 11 February 2017 15:00] Report message to a moderator |
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| Re: AC Choices [message #313049 is a reply to message #313018] |
Sat, 11 February 2017 17:47 |
SpookyEng
Messages: 208
Registered: June 2016
Location: Navarre, FL
Karma: -5
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Senior Member |
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Thanks for all the info. I appreciate the hard earned knowledge here on the forum. Now at least I have some ideas to talk with Jim B about.
JD Lisenby- USAF Ret
1978 Royale-455
MacDash, Manny Tranny, FI-tech, 3.70 etc etc
Navarre, FL
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| Re: [GMCnet] AC Choices [message #313116 is a reply to message #313060] |
Mon, 13 February 2017 08:44 |
Keith V
Messages: 2337
Registered: March 2008
Location: Mounds View,MN
Karma: 0
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Senior Member |
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Besides cost, it is really nice to have an AC in the rear bedroom. I don't mind being hot during the day, but it's so nice to be cool at night.
I have 2 13k penguins in my Royale, 50 amp service, it's pretty nice.
________________________________
From: Gmclist on behalf of Pete Smith
Sent: Sunday, February 12, 2017 6:48:31 AM
To: gmclist@list.gmcnet.org
Subject: Re: [GMCnet] AC Choices
Seems likely that dripping into the coach is an issue that could be fixed on that particular unit rather than replacing the unit.
SpookyEng wrote on Fri, 10 February 2017 21:56
> Our 78 Royale is down at the Coop getting refurbished/repaired after the accident. The AC (2009 vintage) cools ok but drips water into the
> coach.The CoRV is getting a full repaint so I want to go ahead and replace it since it has to come out anyway. Living here in Florida, adequate A/C
> is a major priority! To that end I am seeking some input. Based on the 25ft toyhauler that was our previous RV, one 13.5k unit is marginal at best.
> I want cold AC and a minimum amount of noise. I only have 30 amp service and I am not sure if the coach is set up for two A/C's. Recommendations,
> suggestions?
--
Cary, NC
No Coach yet but likely center kitchen, dry side bath Royale, 78, 403, hopefully with good original white Imron paint.
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Keith Vasilakes
Mounds View. MN
75 ex Royale GMC
ask me about MicroLevel
Cell, 763-732-3419
My427v8@hotmail.com
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