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Old 06-13-2014, 04:03 AM   #1
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Onan install

So I'm getting around to installing my 5500 onan generator and had a couple of questions. For those who have the factory install, does the battery cables, fuel hose and power cords all run across the top of the generator and exit the metal box on the right side Or do all of the cables and fuel hose run through the left side of the firebox?

If anyone had a pic to share that would be awesome.

Thanks in advance,
David
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Old 06-13-2014, 05:13 AM   #2
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David,
I did my own. I ran the fuel supply in from the top of the box down the left side. I also ran the high voltage cable the same route. The fuel line and high voltage cable are exposed on the left inside of the box, but are secured to the bulkhead above the box after that.

A ran the battery cables along the bottom front inside the box, then through the box direct to the batteries.

Not saying its right, but that's how I did it
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Old 06-13-2014, 01:44 PM   #3
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I ran everything straight back from the bottom left side, across the back wall, over to the ats. I hired a midget to crawl over the top of the box and then feed me the wires.
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Old 06-13-2014, 06:53 PM   #4
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Thanks for the responses guys. I'm with you Atom Ant, I'm not sure if there is really a right or wrong way to do it but I thought I would ask.

Spindrift, if I understand you correctly, all your cables exit the box on the left side, then once outside the box they make their way around the back wall or is all the routing you refer to done inside of the box?

Thanks again for the help.
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Old 06-13-2014, 07:48 PM   #5
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Originally Posted by dieseldave View Post
Thanks for the responses guys. I'm with you Atom Ant, I'm not sure if there is really a right or wrong way to do it but I thought I would ask.

Spindrift, if I understand you correctly, all your cables exit the box on the left side, then once outside the box they make their way around the back wall or is all the routing you refer to done inside of the box?

Thanks again for the help.
Exit outside the box and then around, and attached, to the back wall.
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Old 06-17-2014, 07:01 PM   #6
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Well, I've got everything completed for the install except the LP hose coming off the regulator. I couldn't find one at the local propane dealer so I ended up having to order one on line. One last question about the WFCO transfer switch. Their are jumpers in place that say to use if the neutral on the generator is capable of handling 70 amps. The transfer switch on my previous Grand Junction wasn't setup like this. Did you guys leave the jumpers in place or remove them? I looked at the manual from WFCO but it wasn't very clear what the function of these jumpers were.
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Old 06-17-2014, 11:28 PM   #7
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Isn't there a special LP regulator if you have a generator?
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Old 06-18-2014, 12:28 AM   #8
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Originally Posted by dieseldave View Post
Well, I've got everything completed for the install except the LP hose coming off the regulator. I couldn't find one at the local propane dealer so I ended up having to order one on line. One last question about the WFCO transfer switch. Their are jumpers in place that say to use if the neutral on the generator is capable of handling 70 amps. The transfer switch on my previous Grand Junction wasn't setup like this. Did you guys leave the jumpers in place or remove them? I looked at the manual from WFCO but it wasn't very clear what the function of these jumpers were.
The jumpers should remain in place for both the load side, and generator side of the switch.
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Old 06-18-2014, 03:55 AM   #9
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Isn't there a special LP regulator if you have a generator?
I'm not sure about it being special but the one that came with the gen prep package was the correct one.
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Old 06-14-2015, 06:18 AM   #10
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David,
I did my own. I ran the fuel supply in from the top of the box down the left side. I also ran the high voltage cable the same route. The fuel line and high voltage cable are exposed on the left inside of the box, but are secured to the bulkhead above the box after that.

A ran the battery cables along the bottom front inside the box, then through the box direct to the batteries.

Not saying its right, but that's how I did it
Atom ant; can you post a pic of how you run your exhaust pipe? i have the 38GK I am concerned about the ground clearance. I also installed mine. Not sure there is a right or wrong way to install the Genset.
Mark
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Old 06-14-2015, 03:35 PM   #11
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Mark,

I just ran mine straight out. I had the exhaust pipe from previous installs, but I had to shorten the height because the Redwood sets low to the ground, and Redwood didn't use any kind of frame structure under the generator like the previous brand we had the gen installed in. A muffler shop shortened the rise and re-welded it.

Not the greatest pic, sorry. Everything I looked at had shadows or coolers stored in front of it.
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Old 06-14-2015, 08:09 PM   #12
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Most manufacturers will not run the exhaust out under a slide (they will angle it further back so it does not exit under anything) , I assume having the exhaust under the slide is not a good thing, could leak carbon monoxide into the slide room.
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Old 06-15-2015, 05:33 AM   #13
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I have a hard time believing that by running the tailpipe back to that 2' space between the slides that I can actually train my carbon monoxide to "only" go straight up To me the way Redwood runs it, it is actually more hazardous because it puts the exhaust closer to the lower hanging slide, with greater potential for it to collect underneath. If you seriously look at my picture you'll see what I mean. I'm actually more out in the open than the Redwood design.

I know something has changed in the code when I see all these generator pipes running down the side like a Corvette with sidepipes , but my tailpipe came off my 2003 which was installed by the factory and ran exactly how I have it now with the same slide arrangement. I figure it didn't kill me then, I've got a fighting chance it won't this time either.

Just remember no matter where your tailpipe discharges, you can create your own issues running the rooftop fans on exhaust. Those things pull enough CFM to pull a negative and you can draw many nasty things back into the trailer.
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Old 06-15-2015, 10:29 AM   #14
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I agree AA, I have seen some goofy installs by the factory, probably a legal thing.
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Old 06-16-2015, 06:35 AM   #15
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exhuast pipe

Atom Ant, my plan is to angle it back further so that I can attach a gen-turi system. Thus getting the exhaust up above the roof line. That is why I wanted to see how you routed yours. I actually see nothing wrong with yours. ON my last Fifth wheel I installed my own 7KW Onan and I actually let it exhaust straight out the bottom. Would set a fan up at the edge of the bottom of the RV so it would blow the fumes out from under the RV. And I only done that when there was no natural breeze strong enough to keep the fumes from building up underneath. I never had a problem with that set up. However I was careful and made sure my sensors inside were operating properly.
Another question I have for you. Do you find that leaving the cargo door closed makes the generator run to hot? Did you make any additional fresh air vents for the Generator box?

Thanks Mark
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Old 06-16-2015, 03:45 PM   #16
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Mark,

I had the same concern back when I put it in our 2007, but no vent is needed beyond the bottom. If you look in the manual, the generator has a large fan and shroud on the bottom that draws air up from the bottom and circulates it around the generator than pushes it back out the bottom. All you need is the bottom opening (which is already configured in the cabinet with the gen prep). Everything above the base is designed to stay enclosed for quietness.

Two mistakes I made that are good lessons learned:

My generator has some holes in the base for routing exhaust out the front, side, or back. Those need to be covered with aluminum tape (per Onan), or the fan will push heat into your cabinet and can melt the cabinet door like I did on my Montana. With those unused holes closed off, it will run nice and cool.

I was messing with mine and I left the cabinet door open and the front panel off and ran it for an hour in the heat - it actually shut down from overheat and I almost destroyed it. With the cover off and cabinet opened, it disrupts the cooling flow out the bottom and it will quickly overheat. Fortunately it survived as that was 11 years ago, and that same generator has been our friend for 12 years now.
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Old 06-16-2015, 11:03 PM   #17
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I think the way our exhaust is installed is ridiculous. Like you said AA: It puts it more near the living room slide which is much larger and lower to the ground. We never run our gen at night while we are sleeping anyway... at least we haven't so far. My pipe nearly drags the ground it is so LOW. We are talking about altering it. It is literally like 6 inches off the ground when we are underway. I am sure we will tear it off somewhere. PLUS: Carbon monoxide travels LOW, not HIGH. It settles. This is why water skiers and swimmers get killed hanging out behind the tow boat too long if it is running.
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Old 06-16-2015, 11:49 PM   #18
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I'll tell you a funny story.

In front of my house, the street is downhill somewhat. I would typically disconnect from the truck and lower the front end so I could wash bugs off the front, and I noticed it would stop with about 5-6 inches of piston showing in the front. I just assumed that was the limit, so I would disconnect and use "auto retract" knowing it would stop short of hurting anything.

Went to wash it at a campsite - same routine - hit "auto retract" and ......it didn't STOP! It went straight to the ground and shoved that tailpipe clean up against the frame and up into the generator! I didn't even want to look!

As it turns out, the angle was just right so it didn't crush the tailpipe, and where it connect to the onan its on springs for the muffler so no harm done. What I learned is the leveling system wasn't limiting stroke on my street, it was limiting how far off level it was willing to travel. In the level campsite it was more than willing to take me all the way down.
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Old 06-17-2015, 12:19 AM   #19
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We bought our '12 36RL used last April. Had a Onan 6500 watt already there when we purchased it. The exhaust runs to the rear of the drop frame then runs to the off door side or street side. Between both slide out rooms. Could easily run the Venturi exhaust up over the roof I guess If I wanted or need to. I believe if exhaust is run closer than 4 or 5 inches from underbelly types that are flammable they need some sort of heat shield. Exhaust must also be more than 36" from any slide out room opening.

Chris
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Old 06-17-2015, 12:40 AM   #20
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On my RL it comes out of the Gen box and dumps straight down on curbside. Never had an issue. If the wind is blowing front to back you can smell it occasionally. You could run the venturi pipe straight up in front ofthe propane door and miss the bedroom window if you had a problem with it
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