clint
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Posts: 9
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Post by clint on Jan 28, 2016 3:29:47 GMT
Thanks for the information. I have replaced the relay with the Supco R081 and the short cycling issue seems to have stopped. When I first started the refrigerator it was still pulling around 250 watts but didn't trip the overload and it slowly backed down to 160 watts. Now it stays between 160 and 190 watts when running.
The new relay seems to be very hot after the refrigerator runs. I can only touch it for a second or two before I have to stop. Is this normal or a problem with the new relay?
When I was installing the new relay I ohmed the compressor and got the following readings Common to Run 4 Ohms Common to Start 19.6 Ohms Run to Start 23.3 Ohms
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Post by ChrisJ on Jan 28, 2016 4:04:12 GMT
Sounds normal. That relay works on heat as it's not a mechanical relay. It also has a built in overload.
Here are the specs I received in an email from Supco.
The overload protector in a URO81 has a steady state RLA [run load amps] of 4 amps. This means that the UTC [ultimate trip current] is 4 amps. If the continuous draw amps exceeds 4 amps the URO81 will trip in about 15 seconds at a 70 degrees. The LRA [locked rotor amps] protection is 12 amps, this will trip in about 2 seconds. The URO81 is a PTC device and runs hot to the touch as all PTC relays do.
I think URO81 has terminals, RO81 has wires.
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Post by coldspaces on Jan 28, 2016 6:07:55 GMT
Great to hear that the relay seems to have solved the problem. Those ohm readings on the windings look pretty good if memory serves me.
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clint
New Member
Posts: 9
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Post by clint on Jan 28, 2016 12:17:46 GMT
Thanks for all the help and suggestions. I appreciate it.
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