Dual CS single A/C

[andradef]

My 78 Royale has a single original Duo-Term 13.5k BTU roof A/C that is working well. However, I live in Florida and plan on camping during the summer (think 95+ degree days). I don’t think the 13.5k will handle one of these very hot days (I like it nice and chilly inside). Here are two options I’m considering:

- replace the original 13.5k with a 15k Coleman Mach 10 (I love having the digital control and Bluetooth);

Or

- keep the original 13.5k and add a second unit. In this case I’d go with the 13.5k Mach 10 NDQ (quiet version). I’d run the latter primarily and in a very hot day I’d use the old Duo-Therm as a second unit. Another benefit is the redundancy (if one breaks down during a trip, I still have the other

I really like the quietness of the NDQ, but at 13.5k it may require a second unit on a hot day.

My questions: do you guys think a single 15k unit can handle 95+ degree days? Also, will the 30 AMP shore line be able to handle two 13.5k units running simultaneously?

Thanks!

///Flavio
andradef
78 Royale RB

 

[john phillips]

30 amp shore power is not a problem. It comes into the coach as 220 volts
with one hot leg on each side of your circuit breaker box. you will only be
pulling less than 15 amps on each leg that can do 30 amps each. I like
keeping your original unit as backup/extra cooling. That way you get 27k if
you really need it.
My coach is wired with the back AC unit as the only load on one leg. The
rest of the coach is on the other leg.

On Tue, Jan 14, 2020 at 8:36 PM Flavio Andrade via Gmclist <

> My 78 Royale has a single original Duo-Term 13.5k BTU roof A/C that is
> working well. However, I live in Florida and plan on camping during the
> summer (think 95+ degree days). I don’t think the 13.5k will handle one of
> these very hot days (I like it nice and chilly inside). Here are two
> options I’m considering:
>
> - replace the original 13.5k with a 15k Coleman Mach 10 (I love having the
> digital control and Bluetooth);
>
> Or
>
> - keep the original 13.5k and add a second unit. In this case I’d go with
> the 13.5k Mach 10 NDQ (quiet version). I’d run the latter primarily and in
> a very hot day I’d use the old Duo-Therm as a second unit. Another benefit
> is the redundancy (if one breaks down during a trip, I still have the other
>
>
> I really like the quietness of the NDQ, but at 13.5k it may require a
> second unit on a hot day.
>
> My questions: do you guys think a single 15k unit can handle 95+ degree
> days? Also, will the 30 AMP shore line be able to handle two 13.5k units
> running simultaneously?
>
> Thanks!
>
> ///Flavio
> andradef
> 78 Royale RB
>
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
>

--

*John Phillips*

 

[Ken H.]

Sorry, John, but that's not the way the GMC's 30A circuit works: It
supplies 30A at 120vac ONLY -- NO 2 legs.

Modern low-current A/C's MAY be able to run on a single 30A circuit if
there's little other loading. But, what most of us have found necessary is
the installation of a separate dedicated supply cable for the second A/C.

Even with that requirement, my recommendation to Flavio is to install a
second A/C. My 23' has a modern 13.5 A/C, is well insulated (including
"honeycomb" blinds), and has a cockpit curtain which can isolate that area
pretty well. Even with all that, here in GA and other southern areas we
still sometimes can't keep the interior temperature below 80*F. His 26'
will probably have at least 10% higher cooling needs.

Ken H.

On Wed, Jan 15, 2020 at 6:16 AM John Phillips via Gmclist <

> 30 amp shore power is not a problem. It comes into the coach as 220 volts
> with one hot leg on each side of your circuit breaker box. you will only be
> pulling less than 15 amps on each leg that can do 30 amps each. I like
> keeping your original unit as backup/extra cooling. That way you get 27k if
> you really need it.
> My coach is wired with the back AC unit as the only load on one leg. The
> rest of the coach is on the other leg.
>
> On Tue, Jan 14, 2020 at 8:36 PM Flavio Andrade via Gmclist <

>
> > My 78 Royale has a single original Duo-Term 13.5k BTU roof A/C that is
> > working well. However, I live in Florida and plan on camping during the
> > summer (think 95+ degree days). I don’t think the 13.5k will handle one
> of
> > these very hot days (I like it nice and chilly inside). Here are two
> > options I’m considering:
> >
> > - replace the original 13.5k with a 15k Coleman Mach 10 (I love having
> the
> > digital control and Bluetooth);
> >
> > Or
> >
> > - keep the original 13.5k and add a second unit. In this case I’d go with
> > the 13.5k Mach 10 NDQ (quiet version). I’d run the latter primarily and
> in
> > a very hot day I’d use the old Duo-Therm as a second unit. Another
> benefit
> > is the redundancy (if one breaks down during a trip, I still have the
> other
> >
> >
> > I really like the quietness of the NDQ, but at 13.5k it may require a
> > second unit on a hot day.
> >
> > My questions: do you guys think a single 15k unit can handle 95+ degree
> > days? Also, will the 30 AMP shore line be able to handle two 13.5k units
> > running simultaneously?
> >
> > Thanks!
> >
> > ///Flavio
> > andradef
> > 78 Royale RB
> >
> > _______________________________________________
> > GMCnet mailing list
> > Unsubscribe or Change List Options:
> > http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
> >
>
>
> --
>
> *John Phillips*
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
>

 

[bdub]

Get rid of the ol 13.5 and put 2 new 15kbtu units in. Be sure your
generator is reliable. Beef up insulation where you can. Tint windows and
use white reflective paint on the roof (and sides if possible). Inatall
full length awnings on both sides.
bdub ... Central Texas

On Tue, Jan 14, 2020, 9:36 PM Flavio Andrade via Gmclist <

> My 78 Royale has a single original Duo-Term 13.5k BTU roof A/C that is
> working well. However, I live in Florida and plan on camping during the
> summer (think 95+ degree days). I don’t think the 13.5k will handle one of
> these very hot days (I like it nice and chilly inside). Here are two
> options I’m considering:
>
> - replace the original 13.5k with a 15k Coleman Mach 10 (I love having the
> digital control and Bluetooth);
>
> Or
>
> - keep the original 13.5k and add a second unit. In this case I’d go with
> the 13.5k Mach 10 NDQ (quiet version). I’d run the latter primarily and in
> a very hot day I’d use the old Duo-Therm as a second unit. Another benefit
> is the redundancy (if one breaks down during a trip, I still have the other
>
>
> I really like the quietness of the NDQ, but at 13.5k it may require a
> second unit on a hot day.
>
> My questions: do you guys think a single 15k unit can handle 95+ degree
> days? Also, will the 30 AMP shore line be able to handle two 13.5k units
> running simultaneously?
>
> Thanks!
>
> ///Flavio
> andradef
> 78 Royale RB
>
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
>

 

[Jim Hupy]

Like I mentioned earlier in this thread, it is like 5 blind guys looking at
an elephant. One has the tail, one a tusk, one a trunk, etc. NONE OF THEM
REALLY KNOWS WHAT THE WHOLE CRITTER LOOKS LIKE. Same with various years of
GMC coaches.
Only reason I have a fair idea of them, is i have worked on so many
different year models. Believe you me when I say some of those changes are
hazards to navigation.
Same can be said for R.V. park service posts. UNTIL YOU CHECK FOR
YOURSELF WITH AN ACCURATE METER, YOU NEVER KNOW FOR SURE WHAT IS WHAT. I
personally have found 3 phase 240 volt service at those posts. That will
wreck your day for sure if you jury rig into that.
Jim Hupy
Salem, Oregon

On Wed, Jan 15, 2020, 7:20 AM Billy Massey via Gmclist <

> Get rid of the ol 13.5 and put 2 new 15kbtu units in. Be sure your
> generator is reliable. Beef up insulation where you can. Tint windows and
> use white reflective paint on the roof (and sides if possible). Inatall
> full length awnings on both sides.
> bdub ... Central Texas
>
> On Tue, Jan 14, 2020, 9:36 PM Flavio Andrade via Gmclist <

>
> > My 78 Royale has a single original Duo-Term 13.5k BTU roof A/C that is
> > working well. However, I live in Florida and plan on camping during the
> > summer (think 95+ degree days). I don’t think the 13.5k will handle one
> of
> > these very hot days (I like it nice and chilly inside). Here are two
> > options I’m considering:
> >
> > - replace the original 13.5k with a 15k Coleman Mach 10 (I love having
> the
> > digital control and Bluetooth);
> >
> > Or
> >
> > - keep the original 13.5k and add a second unit. In this case I’d go with
> > the 13.5k Mach 10 NDQ (quiet version). I’d run the latter primarily and
> in
> > a very hot day I’d use the old Duo-Therm as a second unit. Another
> benefit
> > is the redundancy (if one breaks down during a trip, I still have the
> other
> >
> >
> > I really like the quietness of the NDQ, but at 13.5k it may require a
> > second unit on a hot day.
> >
> > My questions: do you guys think a single 15k unit can handle 95+ degree
> > days? Also, will the 30 AMP shore line be able to handle two 13.5k units
> > running simultaneously?
> >
> > Thanks!
> >
> > ///Flavio
> > andradef
> > 78 Royale RB
> >
> > _______________________________________________
> > GMCnet mailing list
> > Unsubscribe or Change List Options:
> > http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
> >
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
>