Wednesday 26 October 2011

Central air conditioner fuse blown out?

My air conditioner keeps blowing fuse (FRN-R 30), and it's always the left side one (facing it). The outside fan stops working, and just air is blowing into the house. The run capacitor has been changed, the main fuse has been changed. Yet it continues to blow out the fuse. Solution for this please? Unit is a Bryant
Central air conditioner fuse blown out?
HVAC Tech.: Your system could be overcharged, high head pressure will cause excessive amp draw. Dirty condenser coil same problem. Only three phase compressors do not have capacitors! yours will have start/run capacitors they should be matched to the compressors needs.Another cause might be a restriction /crushed high pressure line. Best bet is get professional help from a service-man you trust. Good luck! Electrical connections need to be checked.
Central air conditioner fuse blown out?
%26quot;Your system could be overcharged, high head pressure will cause excessive amp draw. Dirty condenser coil same problem. Only three phase compressors do not have capacitors! %26quot; That's right

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There are a few possibilities here. First, you may have high starting amps on the compressor. You mentioned the run capacitor being changed. I'm not sure if you have a start capacitor, but that should also be checked. If you don't have a start capacitor, I would recommend having a hard start kit installed in the unit. It's basically a start capacitor with an internal relay to take it out of the circuit when the compressor is running, and wires up in parallel to the run capacitor. Also, check all of your line voltage wiring. Make sure all the wiring connections are tight (wire nuts, screw terminals, etc.), and that there's no issue with wiring insulation rubbing off from vibration, etc. Finally, check the points on the compressor contactor. If the contacts are black and pitting, it causes arcing, which means excessive amp draw through the contactor.
check terminal at the compressor if they are short out or burn out, if not your compressor need replace