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  #1  
Old 02-02-2020
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DFB052686 DFB052686 is offline
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Default New roof airs for an FC, opinions and info wanted

I have noticed a few opinions floating around, send them my direction for consideration.

I am looking to replace the roof airs on my 87 FC31, just 2. Nothing there now, 14x14” openings and original factory wiring.

I am considering 3 factors;
-Overall mounted height(Both internal and external protrusions)
-Cooling effectiveness for the desert heat and considering the smaller size of the bus, this isn’t a slide out 40ft coach
-power usage for the generator could be downsized when replaced etc. (another thread?)

15/13.5k vs 9k. Slim/high efficiency etc... tell me your experience I want real life horror stories about humidity, cycling, generator death, great brands, terroristic retailers, anything could help... I have a forklift, rolling stairs, and spring weather to get this done before the 115 degree summer shows up.
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-Dennis (direct email please! dennis@wanderlodgeowner.com)
Hesperia, California

1987 FC31 “A Rare Bird”
(300HP 3208TA/ZF)

1983 FC35SB
(225HP 3208T/MT643/Jacobs Retarder/Cruisair

Towables:
2007 Grand Cherokee CRD
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  #2  
Old 02-03-2020
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Ernest Ekberg Ernest Ekberg is offline
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15K dometic brisk air 2- with mechanical controls and your problems are over. Plug and play- no thermostat wiring involved
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  #3  
Old 02-03-2020
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badandy badandy is offline
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What generator do you have? I'm sure it is capable of running two 15k's at the same time without issue or I don't think Blue bird would have put it in there. If you're trying to get fancy with solar and running on batteries then efficiency is important. Otherwise just get the biggest possible.
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Old 02-03-2020
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DFB052686 DFB052686 is offline
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Quote:
Originally Posted by badandy View Post
What generator do you have? I'm sure it is capable of running two 15k's at the same time without issue or I don't think Blue bird would have put it in there. If you're trying to get fancy with solar and running on batteries then efficiency is important. Otherwise just get the biggest possible.
I have a gasoline Kohler 7.5k on a passenger slide out, it’s “fine” but not efficient and frankly huge relative to the the power output, thinking of replacement as well.

I’m leaning towards the 15k X2 maximum power solution as well, but want to know if anyone thinks it’s overkill, won’t cycle enough, use too much power etc.

It would be nice to run everything from a Honda EU3000i genset, I would fit, easily, and free up outside storage in the drawer, and I could plumb it to the factory gas tank, and sliding exhaust... but that would require the smaller a/c units, 8-9k ...would they be sufficient? the 3000 is remarkably quiet. So easy to live with
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-Dennis (direct email please! dennis@wanderlodgeowner.com)
Hesperia, California

1987 FC31 “A Rare Bird”
(300HP 3208TA/ZF)

1983 FC35SB
(225HP 3208T/MT643/Jacobs Retarder/Cruisair

Towables:
2007 Grand Cherokee CRD

Last edited by DFB052686; 02-03-2020 at 12:24 PM. Reason: Wording
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  #5  
Old 02-03-2020
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Randy Dupree Randy Dupree is offline
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i have an onan genset like the 87-89 FCs had,a good runner and out of an 89 SP,for sale.
You will have to come up with a rad and fan,the ones in the SP were so rusty and dirty i tossed them.
Thinking about that,i may have the rad.
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2000 LXI 43
Bainbridge,Ga.
Port St Joe Fl.
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  #6  
Old 02-08-2020
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DFB052686 DFB052686 is offline
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After more research and likely an excess of consideration. I purchased a pair of new Dometic Brisk Air II’s (15k BTU/R410a) and the optional electric heat element add ons, with the mechanical control units. A KISS situation.

And since the only electric heat in the 31’ is in the bathroom baseboard, it’s a welcome addition to have another 3100 watts of heaters available if needed, much better set up than a heat pump as well imho.

Finishing up the passenger twin 400ah battery bank next week, just in time to lift the new units onto the roof. Then it will be time for the generator to get squared away.

Randy: think the SP Onan you mentioned would comfortably power everything at once? A/c would be running at “highest rated” numbers out here. I think the only other draw is battery charger and the convection oven...

-are those gensets 3600 or 1800RPM?
-Anyone have a fuel consumption numbers on the Onan?
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-Dennis (direct email please! dennis@wanderlodgeowner.com)
Hesperia, California

1987 FC31 “A Rare Bird”
(300HP 3208TA/ZF)

1983 FC35SB
(225HP 3208T/MT643/Jacobs Retarder/Cruisair

Towables:
2007 Grand Cherokee CRD
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  #7  
Old 02-08-2020
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Randy Dupree Randy Dupree is offline
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the diesel onan is an 1800 rpm genny,it came out of a 1989 SP 36 that i junked out.
1800 hours on it,it runs good and its clean.
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2000 LXI 43
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  #8  
Old 02-09-2020
Orvie6574 Orvie6574 is offline
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I've replaced both my A/C with 15k, I like to be on the cool side
Still have the stock generator 6.5k
It works fine, burns a gallon an hour,
I see no reason to change it, with the time and money
that it would take
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1978 31 FC
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  #9  
Old 03-26-2020
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Well, plug and play has not worked for me this time. I bought a new Dometic Brisk Air 11 to replace my Emmerson rear unit. I got the new unit up on the roof and took the old one off. The wiring plugs are different for old and new. The new unit has a 6 pin plug and the old unit female plug is a 9 pin. The wire colors are all the same except on the old unit there is a brown wire. The new unit has none.
I plan on splicing the old male plug on the new unit but I have yet to find what the brown wire did in the old unit. The Thermostst colors match up without the brown but smarter minds than mine might know if my plan is flawed..
Please advise!
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  #10  
Old 03-26-2020
oldmansax oldmansax is offline
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Shot in the dark here but don't you have to buy a new inside grill with the new controls to match your new A/C? I don't think the old one will work.


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