Onan Generator Heat

[sportsman_500]

On my Raptor 3612 the generator compartment is designed probably like every other one out there. Over the weekend we were running the genny almost non-stop. On Friday night I was checking a few things and noticed the generator compartment door was very hot to the point where you almost could not touch it. When I opened the door I found that the inside liner had deformed from the heat and on the lower right hand corner of the generator there is a horseshoe shaped opening. Super hot air was blasting out of that opening onto the inside of the compartment door. Has anyone else experienced this? Is that hole on the right lower supposed to be blocked off? or is it part of the generator cooling system?





Edited Images to fit the page.

[dannko]

hvac wrote:
Our ATC 28 front bedroom has same size 5.5 mounted on the tongue. They enclosed it with a metal cover but its not internal to the coach. So far no issues.

This is one FEATURE I really like. No worries whatsoever about exhaust and heat. Though even like a conventional rv I was thinking if I get an ATC I would add a radiator fan somewhere in the box to aid in airflow. In Texas on 100 degree days, more air movement is needed.

HVAC how about inside noise, do you think it's less than a coach mounted generator?

[lincster]

I will take a pix of mine tomorrow, but I can tell you, I don't have Aluminum tape and never have had it.

If you google Onan 5500 Marquis gold, you will see a you tube video of Don Mcadams working on one.
I text him today and he said no way should any tape be there.

You can also click on Images and see plenty of these genny's in trailers, I don't see that tape on any of them.
Google Weekend Warrior and you will see that they don't sit on anything.

[Badhabt]

I have a 2007 Raptor 3612, here is a pic of mine. the area is covered by aluminum tape. Looking at yours, it appears that the aluminum tape has been pushed into the hole.

Ive had my genset running an have had the door get really hot. But that was when is was 95 out and we were cammping out in a casino parking lot for a concert.

[lightfoot]

I checked my 5.5 on my Voltage and that hole in the front is blocked with HVAC tape. All air flow is in and out the bottom of the front compartment.

[sportsman_500]

The black cover which is most important is tight and sealed well. The gasket on the bottom which you guys may be referring to is for the compartment door which came unglued from the heat over the weekend.
I believe I have the install manual and will check that later today. Thanks for all the great responses. N

[YC_1]

The device on the outside bottom looks like someone has added to help reduce noise from the air hitting the ground.

That hole that has air coming into the compartment might need to be blocked but without the install manual I can't tell.

I agree that the cover looks like it might not be on tight.

[allcool]

Lincster is right. Check installation manual. It gives specific dimensions/locations of holes that need to be cut in floor where genny mounts for proper air flow. No heat should be blowing out anywhere inside the genny compartment. All cooling air flow, intake air and exhaust air is underneath the genny to the outside of rv.

Hard to see clearly, but from your pics, looks like genny cover is not on correctly and rubber gasket is not in place. If cover is not on correctly air cooling flow will not work right.

[lincster]

You may want to google the installation manual for your genny.
It gives instructions and pix of air flow and how a genny should be installed.
I don't think yours is correct.

[sportsman_500]

lincster wrote:
Why is the genny sitting on foam?
I would be concerned about that.
That foam will hold heat.

It is not. It looks that way from the pic. The foam is the seal between the generator enclosure built into the compartment and the compartment door.

[tinner12002]

lincster wrote:
Why is the genny sitting on foam?
I would be concerned about that.
That foam will hold heat.

And the foam may be blocking the air circulation for the genny causing excessive heat.

[lincster]

Why is the genny sitting on foam?
I would be concerned about that.
That foam will hold heat.

[hvac]

Our ATC 28 front bedroom has same size 5.5 mounted on the tongue. They enclosed it with a metal cover but its not internal to the coach. So far no issues.

[ford_truck_guy]

ford truck guy wrote:
I believe that cut out is for the folks that need to run the exhaust that way. There are 2 of those, 1 on the front and 1 on the back..

The way it was explained to me is that the generator sucks in ambient air from the center front of the Onan, ot cools, then pushes the hot air out. That air comes out real close to where the cool air is sucked in..once you fill that hole, the hot air mail be pushed somewhere else.

I took some heat blanket and stuffed it in the holes, then I used foil tape to seal those holes..

MOST of my heat is now directed in the right direction.. I also purchased a scoop from Onan that helps direct the heated air to the street side of the trailer....

[ford_truck_guy]

This is an front view of the scoop



And this is from under