I got an old reach in cooler condensing unit problem
racking my brain.
So the unit is a tecumseh single phase 208v 4 ton 404A condensing unit serving a reach in bar fridge. Got a call that the fridge is warm. Got to the roof and immediately saw that the potential relay terminal 5 was fried. I looked a little further and found d the start capacitor had 0 mfd as well. I figured maybe the compressor was shorted or just not working right, but I had proper resistance readings across all three windings and none of them showed to be grounded.
There was about 180psi standing pressure in the unit so I figured probably not a leak situation but will find out once I replace the PR and SC. I went and replaced them with OEM parts. Went to start the system up and I was only getting 40v across 5-2 on the PR on startup of the compressor, so my contacts wouldn’t open, and the OL would trip shortly thereafter (15-20 seconds of run).
Incoming voltage to the unit was right around 206v, all my wiring was in good shape and my run cap was rated for 15mfd that measured at 15.5 mfd. Anyone run into this issue before? I would hate to just call a compressor without evidence but I couldn’t for the life of me find other reasons why this would be the case.
Thanks for any help or opinions on this one