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Old 07-11-2012, 09:57 AM   #1
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Univolt location- '74 rear door 22' Argosy

I located the old univolt, in prep for removal, and found it in the bottom of the bath closet and under a shelf which is riveted in place, and which I suspect needs to be removed and then replaced after installing the new unit.

By the size and weight, it appears the old univolt is a big ( and heavy )linear power supply, whereas the new PD is what's called a chopper, or high-freq supply.

Any advice on the installation from those that have gone before?
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Old 07-11-2012, 12:20 PM   #2
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Relocate the new converter to a more convenient location.
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Old 07-11-2012, 01:14 PM   #3
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Great idea TG, except: all of the wires fan out down where the old univolt sits, plus which, I don't want to leave the old unit there. Why haul around (lord knows) how many pounds of old copper? and, btw, it's loose, not bolted down. Is that the way AS made these things?
These were obviously not made to facilitate easy after market repairs.
I plan to remount that shelf after the replacement is done.
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Old 07-11-2012, 03:34 PM   #4
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The third set of photos on post #14 of this thread

http://www.airforums.com/forums/f449...ter-92262.html

will show you what the PD 9254 in my 75, 22' rear door Argosy looks like. I cut the front off the original Univolt and used the glass fuses over again.

The second set was what my 74' 20' Argosy installation looks like. I used a new blade type fuse box for that one.

The univolt should have been screwed to the floor originally, but most likely has broken loose and the screws pulled out. They only used 2 front screws to begin with. There should be enough wire to re-locate the fuses and the new PD converter in the back of the closet.

You can also see Rogerdoger's photos of his replacement in his '78 Argosy in the same post.
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Old 07-11-2012, 05:35 PM   #5
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I did the same swap on my Argosy as idroba. I reused the glass fuses. I have a center bath, so mine is located in the closet in the middle of the trailer. One thing I wish I would have done was to add a battery disconnect switch. Sure is nice to be rid of the univolt though.
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Old 07-11-2012, 10:07 PM   #6
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There is a picture somewhere that shows the PD9245/9260 mounted on the wall next to the A/C power fuse box. You can put it there, and a new fuse box. Then it wont have to be under the shelf. Here is mine. I plan to put it under the shelf after I redo the plumbing/shelf removal and replacement.
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Old 07-11-2012, 10:23 PM   #7
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Yep, idroba has the pics of his on the wall. I may opt to do that as well, my only concern is heat/air circulation when it is mounted vertically here in summer temps 100+ degrees.
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Old 07-13-2012, 07:47 AM   #8
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I mounted mine on the wall of my 24 ..... no circulation problems in hot weather
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Old 07-13-2012, 08:07 AM   #9
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I know the power supply has a fan, but if vertical mounted, there may be some heat not getting out, causing shorter life of the unit. Orlop and idroba, did you mount it with the fan up, down, or sideways?
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Old 07-13-2012, 10:33 AM   #10
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Fan on the upper right side in both of my Argosy instals. The fan does not operate much, if at all as far as I can determine, but I am in a cool state. I really doubt that it is an issue. The instructions are not adamant about any specific mounting.
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Old 07-14-2012, 07:33 AM   #11
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I mounted with fan down and as idroba said ..... the fan does not run that often and I am in East Texas. I did put a brace under the unit since you are mounting into the aluminum.
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Old 08-07-2012, 09:45 AM   #12
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Quote:
Originally Posted by Orlop
I mounted with fan down and as idroba said ..... the fan does not run that often and I am in East Texas. I did put a brace under the unit since you are mounting into the aluminum.

The orientation of the 9245 is determined (at least for me) by the location of he two main fuses for the DC out, which need to be
Accessible, so it will be above the shelf mounted vertically with the new fuse block.

Images to follow (it's been too hot to work inside of an aluminum oven lately....
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