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Thread: Looking for RSU99 replacement
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06-01-2005, 07:58 PM #1
Looking for RSU99 replacement
Hi guys.
Came across an old AC package controlled by RSU99 made by Stefa Controlls.
Two cooling stages.
Two heating stages.
It was lat so I didnt call anyone to start searching on this side of the world.
Any idea anyone??
Thanks
Chemi
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06-01-2005, 08:36 PM #2
Re: Looking for RSU99 replacement
Hi chemi
Steafa are now under the Seimens umbrella so I did a quick search on their site but unfortunately, the RSU series is not listed. See here http://www.sbt.siemens.com/hvp/staef...=15&ACTION.y=0
Frank
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06-01-2005, 08:49 PM #3
Re: Looking for RSU99 replacement
Thanks Frank.
I am thinking of installing there a simple temp controller with two stages and a dead zone.
I will look tomorow for something.
Chemi
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06-01-2005, 09:01 PM #4
Re: Looking for RSU99 replacement
Have a look here Chemi http://frostechnic.com/eliwell.htm
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06-01-2005, 09:39 PM #5
Re: Looking for RSU99 replacement
We use for such an application the Polygyr from Staeffa, Siemens now.
But I think I know the cards you mean Chemi: is there not a small red button on the front and on the bottom?
If you push it, the alu cover pushes away from the regulator and behind the cover are the switches and potmeters.
The card snaps in a base wit two long bolts with a spring along the bolts.
In the corner of the card you must turn some sort of marker so that it fits in the base just in the right place.
If it's that, then you can use the Polygyr. You can use it anyway for your application. Cost for a Polygyr around 400 € to 450 € I think.
http://www.landisstaefa.com/prd/e/prd_sta_hva_poj.aspIt's better to keep your mouth shut and give the impression that you're stupid than to open it and remove all doubt.
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06-01-2005, 10:45 PM #6
Re: Looking for RSU99 replacement
Just a thought Chemi, is the control actually dead ? Have a look inside under the side cover and check to see if there are still any spare transistors in their holders; if so it might be worth while changing them to see if the beast will restart.
Other than that please give it a decent burial having died at a ripe old ageBrian - Newton Abbot, Devon, UK
Retired March 2015
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07-01-2005, 04:40 AM #7
Re: Looking for RSU99 replacement
Thanks guys.
Frank, its a good site, kept it in favorites.
Peter, the one you show, is a different one, we use it in AHU.
its a cooling and heating with two lamps which show cooling or heating demand and a temp dial.
Going out now and among other things, I will start looking.
Chemi
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