Defrost Timers

[rsp4834]

Ok guys, I have replaced a defrost timer on an open refrigerated deli case. I used a Paragon 8145-20. I could barely make out the number on the old timer but it is a Precision 6041-20. All I needed was a set of NO NC contacts. When I wired everything up something was shorted somewhere. I checked the the wiring, and I had the LLS connected to the NC contacts and the defrost heater on the NO contacts. these timers are from different manufacturers. I thought I had everything correctly wired according to the schematic. What am I missing? Any wiring diagrams or info is helpful.

[NormChris]

These timers are pretty simple. You should know that the 8145 has flat copper jumpers connecting the screw terminals going to the contacts and the timer motor connections on the face of the timer.

Depending on how the timer is applied you may have to remove one or more of those jumpers or change their position. They are part of the circuit. So, you have to include them in the circuit wiring when you trace out the circuit. They may be your shorted circuit.

Trace the circuit out carefully and include the flat copper jumpers as part of what you need to trace out.

BTW, the 8145 series of Paragon timers are great clocks and have been around for many years. Well proven and they last. But, you do need to apply them properly.

Norm

[rsp4834]

That might be my problem Norm. I'll recheck everything again. Thanks for the info.

[rocket]

the heatcraft installation manual has very good
generic wiring diagrams plus a lot of good service
stuff

no mechanic shoul be without this manual

here's the link to download PDF file
http://www.heatcraftrpd.com/Maintenance/manuals/H-IM-64K.pdf

[270wsm]

That is an excellent manual with lots of useful information.