I wasn't sure where to post this but since it is used in a commercial kitchen, figured I hit the refrig gurus. I have a problem I have never seen. I have a small Dayton blower motor used in a Giles vent less hood which will melt the start cap.
Details, small approx 1/4 hp Dayton blower motor, 115/230v wired for 230, data plate 3.7 amps @ 230v, uses a 20uf, 250vac start cap. Last week it melted the original, today I installed a generic Dayton 21-25uf 250vac replacement. (Original oem part made by other than Dayton no longer available at Grainger nor Giles). The generic replacement popped & melted in 5 mins. BUT the motor runs perfectly, no bearing noises, pulls 2.1amps, will start WITHOUT the start cap installed and the unit is working.
The actual line input volts is 249vac. Little high but I can't see this being the issue. I didn't think to check at the actual volts at the cap terminals at the time. But if this motor is running cool & quiet, what can cause this issue? I'm gone to check the volts at the terminals with the motor running, maybe install a 330vac, 20mf start cap.
Is this motor defective? Any ideas?