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Old 03-05-2011, 08:10 AM   #1
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3 refrigerator installation questions

I am taking a Dometic Silohette refrigerator from another RV and installing it in my 1960 Overlander. I have the vented panels on the side and I have a plate inside over a chimney vent that has never been used (old fridge was electric). I was going to lay vinyl flooring where the refrigerator will sit.

What do I need to know that I might not be considering?

What is used to attach the refrigerator chimney to the one that is covered on the wall?

Does the floor need anything special?

All help and advice is needed.

Brian
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Old 03-05-2011, 08:28 AM   #2
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Best of all you look in the Installations instructions with Dometic.
According to model (gas?) it needs in the ground or in the outer wall air supply.
In my Blog I have drawn the installation of my fridge.

Greetings from Switzerland
Werner
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Old 03-05-2011, 08:31 AM   #3
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Thanks Werner! I will do that.


Brian
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Old 03-05-2011, 08:44 AM   #4
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Check the location of the outside vent. It needs to be low on the outside wall.

My '59 Tradewind also had an electric only refrigerator. It had a small inlet vent in the floor through the belly pan, and an outlet vent at tummy level. If this is the same arrangement as your '60 Overlander it will not work for a 2-way refrigerator.

For best performance you need an inlet and outlet vent separated by at least 60 inches. More is better. More separation gives better draft and better removal of heat from the condenser.

You can build your own refrigerator chimney from aluminum, or lay one up out of fiberglass. I made mine out of aluminum.

Here is a picture of the inlet vent I added. The original vent at tummy level was changed into a door and shallow storage compartment for hoses and power cords.

Second is a picture of how I did the chimney.
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Old 03-05-2011, 09:45 AM   #5
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Mark:

I have the lower vent like yours. Next thing I need to know is what do they attach from the chimney to the vent connection inside the trailer? Do I have to order it or can I buy it at a hardware store.

Brian
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Old 03-05-2011, 10:12 AM   #6
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Do you have a picture?

You can buy a premade refrigerator scoops made from ABS or fiberglass. I don't know if Out Of Doors Mart has them. I think they have them at Inland RV.

They might be pricy, which is why I built my own.

Is your chimmney round, or is it oval?
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Old 03-05-2011, 10:20 AM   #7
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Originally Posted by Lothlorian View Post
Mark:

I have the lower vent like yours. Next thing I need to know is what do they attach from the chimney to the vent connection inside the trailer? Do I have to order it or can I buy it at a hardware store.

Brian
In our '66 Safari, there is no connection between the lower vent (ours is in the floor) and the upper "chimney" over the refrigerator compartment. The outer wall of the trailer, the back of the refrigerator, and the walls of the refrigerator compartment form a passage for the air to flow upward across the fins of the refrigerator cooling unit. Make sure the "chimney" is well sealed to the interior part (counter, etc.) over the refrigerator, and that the refrigerator is well sealed into its compartment.

We found a lot of great schematics and information at rvmobile.com.
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Old 03-05-2011, 06:59 PM   #8
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I am posting some pictures and please give me some of your thoughts.

If you notice you can see where there was a vent installed on this trailer. There is a hole under the metal protection cover. No screen and it does not go through to the inside. Why is it there? I have no idea. It is first picture.

2nd picture is the plate I removed only to find A.C. wires. Somebody must have installed the outlet.

3rd picture is of the refrigerator area

4th picture is the roof that does not have an chimney outlet to the outside.

I would like to use the chimney out let in the first picture. Is it big enough? How big does the exhaust hole need to be?

I have a plan for the cabinet. I will build it all the way to the top.

Brian
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Old 03-05-2011, 07:03 PM   #9
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Inside ceiling with not outlet for chimney.

Brian
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Old 03-05-2011, 08:03 PM   #10
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Originally Posted by Lothlorian View Post
I am posting some pictures and please give me some of your thoughts.

If you notice you can see where there was a vent installed on this trailer. There is a hole under the metal protection cover. No screen and it does not go through to the inside. Why is it there? I have no idea. It is first picture.

2nd picture is the plate I removed only to find A.C. wires. Somebody must have installed the outlet.

3rd picture is of the refrigerator area

4th picture is the roof that does not have an chimney outlet to the outside.

I would like to use the chimney out let in the first picture. Is it big enough? How big does the exhaust hole need to be?

I have a plan for the cabinet. I will build it all the way to the top.

Brian
Brian,

The chimney for your fridge is in the second picture in post 8, just above the outlet. The fridge gases were vented into the wall and up to the eyebrow vent on the outside of the trailer. Here are some pics of how it looks when the skins are off. You can see the tiny 1 1/2" hole that lets the gases out through the roof in the first picture just to the left of the larger collar. The original owner of my trailer installed the collar and later model fridge chimney/flue sometime in the 60's. I'm really not sure the original 1960 venting setup is sufficient for a modern fridge.

Norm
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Old 03-05-2011, 08:10 PM   #11
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Thanks Norm,

I guess this is going to get a bit more complicated. I will have to order the new collar and vent cover and install it.

Brian
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Old 03-05-2011, 08:10 PM   #12
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On my 72, a PO ran a extension cord through the floor and belly pan. The extension cord allowed to run the fridge, without hooking up the entire camper. You can also take off the access door for lighting the propane part of fridge, and switch to the Airstream 110 system.
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Old 03-05-2011, 09:22 PM   #13
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Thanks Norm,

I guess this is going to get a bit more complicated. I will have to order the new collar and vent cover and install it.

Brian
Brian, before you order the collar and vent cover, take a look at Frank's blog post from when he replaced his original Dometic. He went ahead and used the original venting setup with the small eyebrow vent and it seemed to work fine. He riged up a method of channeling the gases into the wall. You might want to call him and ask how that is working.

Norm
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Old 03-06-2011, 04:37 AM   #14
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Norm:

I really appreciate your ideas and help. If you look at my vent doors from the outside you can see I have two doors vent doors. That is a pretty big surface area of fresh air coming in. Convection currents is what I am most concerned about. Hot rises and leaves cold air to fill in the area (air pressure). I just want to make sure the hot air has a way to circulate out of the trailer. Much of those coils will be up against the vents and air circulation should be constant. I will have to measure and observe.

I may go with the original because I can always come back and add another vent.

I might give the person who kept his original vent a call.

Brian
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