This is a Traulsen design. At the time they were trying to compete with Sub-Zero for the residential market.
The first design used a static condenser mounted on the back with a 1” X 6” squirrel cage fan on a rheostat blowing from the top down. (Without the fan the compressors were over heating.) This same model had the freezer evaporator in the walls of the freezer. It was a lot of fun telling a customer that just paid 4g’s (mid 80’s $) that the freezer was a manual defrost. Along with the compressor noise issue this model was soon put to rest.
The new design used Tecumseh AE4440 & 4430 pumps (I believe) with a 2 circuit condenser coil-1 fan. These are not Tecumseh condensing unit’s just there compressors. Everything wrapped with insulating sheets to keep the noise down. (even they learned by there mistakes and did away with the in wall evaporator)Unfortunately they couldn’t compete with Sub-Zero and the others and the entire line was dropped.
Old man Traulsen, yes that was his name, started as a tech (mechanic as us old farts used to be called) and built the company. He took pride in seeing his name all over the world.
As a young mechanic I was sent to his apartment on 5th Ave in Manhattan. Getting off the service elevator there was no question which door was his. All Stainless Steel with the same Traulsen label.
There is no better manufactured piece of refrigeration equipment out there. Compressors, Fans, Controls etc will always fail but the Traulsen cabinets were built like a tank. I still see and service units 30 and 40 years young.
The relay problem is fixed -- it was simply wired backwards. Now the fan goes on whenever either side is on. I am still trying to figure out if it would screw things up to rewire it to run the condenser fan in line with the compressors. Otherwise, I might think about BLDC fan motors for this thing.
Thanks for the interesting history. You can still get the 48 inch version (now, the "Space Saver" line), although no longer with an ice maker. I don't think they can get them efficient enough to market them to the residential market, even though that is really what they were designed for.
Thread closest to my problem: condenser fan runs constantly
Hi all: I'm hoping some of the solvers of the last issue with a similar can help me here. I have a URS48DT, and the way the condenser fan relay is wired, for the life of me I can't see how the fan is supposed to ever go off. Surely it is supposed to though, when neither compressor is runnign?
I have a wiring diagram Traulsen sent me for the UR48DT, and it correctly shows the relay coil energized by the thermostat. But my URS has such a different rats nest, I can't tell if it's supposed to be like that, or if it was wired wrong. I've tried trial-and-error swapping of the relay coil, NO and NC connectors, but the fan keeps running, independent of the thermostats being on or off.
a) There wouldn't be a relay if the fan on the URS was supposed to keep running, right?
b) Does anyone have a URS48DT wiring diagram?
Originally Posted by pecmsg
Could I possibly get the wiring diagram from you. Thank you
Attached. The (rather untidy) blue add-ins are for the relay I added to stop the condensor fan running when both compressors were off. Good luck.
Originally Posted by mxavierr