Home » Public Forums » GMCnet » Dual roof air (In front positions)
| Dual roof air [message #349877] |
Tue, 05 November 2019 07:35  |
6cuda6
Messages: 975
Registered: June 2019
Karma: -6
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Curious....anyone running dual roof a/c units but in thr front vent possition and the normal center?
Rich Mondor,
Brockville, ON
77 Hughes 2600
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| Re: [GMCnet] Dual roof air [message #349884 is a reply to message #349877] |
Tue, 05 November 2019 16:18  |
powwerjon
Messages: 849
Registered: March 2013
Karma: -2
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Rich,
Factory layout was middle and back for dual air, with vent fan in front opening. The factory wiring is in the middle and rear locations. Single AC was in Middle with vent fan in front and rear. There is no advantage of having 2 in the front openings, it will get hot in the back and you will not like the noise of 2 units running right next to each other. also you will have a possible issue of the cold air from one affecting the thermostat of the other. You live in Ontario, the necessity of needing a dual air package is minimal. We live in Michigan and with our first coach we had a singe AC (we put it is now when we did the restoration of the coach) in the middle position and never had a situation that the single AC couldn’t handle. If you have the original AC, it would be advantageous if you upgraded to a 15.5K BTU unit in the front and the need for one in the rear in minimal. If you’re planning to do some travel to areas that do get hot during the summer then a dual setup would work well. We have one of the 29.5” Buskirk stretch coaches and it has a 15.5 in the front with heat strip and 13.5 in the back with heat strip. Very rarely do we run both, typical we run the back to keep the noise reduced when we are in the front of the coach, the exception being the solar eclips rally in Paducah, KY when the temps hovered right at 95 degrees with a very high humidity, then we worked both real hard to stay cool and dry. There was no shade in the campground either. That is the one time that we ran both to cool the coach in the 20 years that we have been GMC’ering. My opinions, yours may very.
J.R. Wright
GMC Great Laker MHC
GMCGL Tech Editor
GMC Eastern States Charter Member
GMCMI
78 GMC Buskirk 29.5’ Stretch
75 GMC Avion (Under Reconstruction)
Michigan
> On Nov 5, 2019, at 8:35 AM, tonka6cuda6— via Gmclist wrote:.
>
> Curious....anyone running dual roof a/c units but in thr front vent possition and the normal center?
> --
> Rich Mondor,
>
> Brockville, ON
>
> 77 Hughes 2600
>
> _______________________________________________
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| Re: Dual roof air [message #349885 is a reply to message #349877] |
Tue, 05 November 2019 17:23 |
6cuda6
Messages: 975
Registered: June 2019
Karma: -6
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Yup makes sense....was just curious.
Our coach has a single central unit but we plan on doing some travel in central canada which see's some very hot temps and we have 3 large dogs.
Plus i was able to aquire 2 brand new heatpumps at a crazy low price (the guy didnt want to seperate them) .....so the coach will get both even if we only use 1 most of the time....lol.
Rich Mondor,
Brockville, ON
77 Hughes 2600
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| Re: Dual roof air [message #349889 is a reply to message #349885] |
Tue, 05 November 2019 19:33 |
Carl S.
Messages: 4186
Registered: January 2009
Location: Tucson, AZ.
Karma: 13
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I've seen it done:
http://www.gmcmhphotos.com/photos/michigan-trip-6-2f23-2f11-7-2f1-2f11/p39715-our-2777-eleganza-ii.html
I think John is probably right, it would be best to space them out. The front location, in place of the fan, might make sense for driving with the roof AC on though. Maybe switching the front air conditioner with the vent/fan would get more cold air to the cab area of the coach without causing any other problems.
Carl Stouffer
'75 ex Palm Beach
Tucson, AZ.
Chuck Aulgur Reaction Arm Disc Brakes, Quadrabags, 3.70 LSD final drive, Lenzi knuckles/hubs, Dodge Truck 16" X 8" front wheels, Rear American Eagles, Solar battery charging. GMCSJ and GMCMI member
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| Re: [GMCnet] Dual roof air [message #349891 is a reply to message #349889] |
Tue, 05 November 2019 22:41 |
jimk
Messages: 6734
Registered: July 2006
Location: Belmont, CA
Karma: 9
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If you fire up the units before it gets into the 80F, you'll find it will
maintain temp even in 90 if your coach is not painted dark.
On Tue, Nov 5, 2019 at 5:34 PM Carl Stouffer via Gmclist <
gmclist@list.gmcnet.org> wrote:
> I've seen it done:
>
>
> http://www.gmcmhphotos.com/photos/michigan-trip-6-2f23-2f11-7-2f1-2f11/p39715-our-2777-eleganza-ii.html
>
> I think John is probably right, it would be best to space them out. The
> front location, in place of the fan, might make sense for driving with the
> roof AC on though. Maybe switching the front air conditioner with the
> vent/fan would get more cold air to the cab area of the coach without
> causing
> any other problems.
> --
> Carl Stouffer
> '75 ex Palm Beach
> Tucson, AZ.
> Chuck Aulgur Reaction Arm Disc Brakes, Quadrabags, 3.70 LSD final drive,
> Lenzi knuckles/hubs, Dodge Truck 16" X 8" front wheels, Rear American
> Eagles,
> Solar battery charging. GMCSJ and GMCMI member
>
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
>
--
Jim Kanomata
Applied/GMC, Newark,CA
jimk@appliedairfilters.com
http://www.appliedgmcrvparts.com
1-800-752-7502
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Jim Kanomata
Applied/GMC
jimk@appliedairfilters.com
www.appliedgmc.com
1-800-752-7502
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| Re: [GMCnet] Dual roof air [message #349893 is a reply to message #349891] |
Wed, 06 November 2019 08:09 |
Justin Brady
Messages: 769
Registered: April 2015
Location: Bell Buckle, TN
Karma: 11
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Senior Member |
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If i were doing it again, i would put a unit in the front space, fan in the middle, and a unit in the back.
We currently have one in the middle and rear and it works fine but I would prefer one up front for AC when driving in hot temps.
Justin Brady
http://www.thegmcrv.com/
1976 Palm Beach 455
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| Re: [GMCnet] Dual roof air [message #349894 is a reply to message #349893] |
Wed, 06 November 2019 08:46 |
James Hupy
Messages: 6806
Registered: May 2010
Karma: -62
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My 78 Royale 26 ft. has a 15.5 gravel crusher up front, and a whisper quiet
3 speed hooded fan in the rear. A good deal of the time, cracking open the
tool booth windows and running that fan in the rear is all that is
required. In dry air climate like Palm Desert, the single A/C is sufficient
cooling, even to 100° or so.
High humidity is a different story. In Huston, or Florida, two A/C's
are barely enough. So, it depends upon where you are to a great extent.
Jim Hupy
Salem, Oregon.
On Wed, Nov 6, 2019, 6:09 AM Justin Brady via Gmclist <
gmclist@list.gmcnet.org> wrote:
> If i were doing it again, i would put a unit in the front space, fan in
> the middle, and a unit in the back.
> We currently have one in the middle and rear and it works fine but I would
> prefer one up front for AC when driving in hot temps.
> --
> Justin Brady
> http://www.thegmcrv.com/
> 1976 Palm Beach 455
>
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| Re: [GMCnet] Dual roof air [message #349910 is a reply to message #349894] |
Wed, 06 November 2019 17:05 |
Justin Brady
Messages: 769
Registered: April 2015
Location: Bell Buckle, TN
Karma: 11
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Agreed 100%.
We were in Birmingham for a motorcycle festival recently and it was ~95 degrees and as humid as it comes and both AC's running full out was enough to knock the edge off but it still wasn't
comfortable
Justin Brady
http://www.thegmcrv.com/
1976 Palm Beach 455
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| Re: Dual roof air [message #349921 is a reply to message #349877] |
Wed, 06 November 2019 22:54 |
Rick Staples
Messages: 126
Registered: May 2014
Location: Johnstown, Colorado, USA
Karma: -1
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When we bought our '75 Eleganza over 20 years ago, it was equipped with 2 Duo-Therm units in the front. The dealer said the PO had spent time in Arizona and so needed 2 A/Cs. Over the years we have found this setup works well for us. On the really hot days (which happen more often each year), we often appreciate having two units to try and beat the heat. 25,000 combined BTUs is really barely enough on some days. Be sure you wire them properly. Our IPO had connected both units to the same 20A breaker, which would pop just when needed most. I replaced a couple of breakers with dual breakers to feed the A/Cs, an electric wall heater by the door, and an extra outlet or two.
Even if you tolerate heat better than I do, it's nice to have a spare A/C just in case of failure, not unheard of with 45 year old roof airs. Also, who would ever want to sleep with an A/C droning right over your head in the tiny bedroom? Usually at night it's cool enough so the Fantastic Fan in the rear provides enough cooling/ventilation for sleep, at least here in the west.
My .02, YMMV
Rick Staples
Rick Staples, '75 Eleganza, Johnstown, CO
"Advice is a dangerous gift, even from the Wise to the Wise, and all paths may run ill." -Tolkien
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| Re: [GMCnet] Dual roof air [message #349922 is a reply to message #349921] |
Wed, 06 November 2019 23:55 |
jimk
Messages: 6734
Registered: July 2006
Location: Belmont, CA
Karma: 9
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Lot of times , we teach people how to cut down on heat load so one can
survive with one unit.
Nothing wrong using two units.
Contact me and we can toss around several things that will work.
On Wed, Nov 6, 2019 at 8:55 PM Richard H Staples via Gmclist <
gmclist@list.gmcnet.org> wrote:
> When we bought our '75 Eleganza over 20 years ago, it was equipped with 2
> Duo-Therm units in the front. The dealer said the PO had spent time in
> Arizona and so needed 2 A/Cs. Over the years we have found this setup
> works well for us. On the really hot days (which happen more often each
> year),
> we often appreciate having two units to try and beat the heat. 25,000
> combined BTUs is really barely enough on some days. Be sure you wire them
> properly. Our IPO had connected both units to the same 20A breaker, which
> would pop just when needed most. I replaced a couple of breakers with dual
> breakers to feed the A/Cs, an electric wall heater by the door, and an
> extra outlet or two.
> Even if you tolerate heat better than I do, it's nice to have a spare A/C
> just in case of failure, not unheard of with 45 year old roof airs. Also,
> who would ever want to sleep with an A/C droning right over your head in
> the tiny bedroom? Usually at night it's cool enough so the Fantastic Fan in
> the rear provides enough cooling/ventilation for sleep, at least here in
> the west.
> My .02, YMMV
> Rick Staples
>
> --
> Rick Staples, '75 Eleganza, Johnstown, CO
>
> "Advice is a dangerous gift, even from the Wise to the Wise, and all paths
> may run ill." -Tolkien
>
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
>
--
Jim Kanomata
Applied/GMC, Newark,CA
jimk@appliedairfilters.com
http://www.appliedgmcrvparts.com
1-800-752-7502
_______________________________________________
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Jim Kanomata
Applied/GMC
jimk@appliedairfilters.com
www.appliedgmc.com
1-800-752-7502
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| Re: Dual roof air [message #349930 is a reply to message #349877] |
Thu, 07 November 2019 12:34 |
JohnL455
Messages: 4447
Registered: October 2006
Location: Woodstock, IL
Karma: 12
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Senior Member |
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Also units need to be in " free air" so exhaust heat from one condenser does not get to intake of the other. If you have a 14-50 setup be sure one unit is on each leg to balance the load when on shore power. This minimizes current on neutral and minimizes voltage drop especially important when conditions are severe.
John Lebetski
Woodstock, IL
77 Eleganza II
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