HVAC Questions? Ask an HVAC Expert for Answers ASAP
1) I need someone to confirm the specifications for a dual capacitor that should be installed in the outdoor condenser unit of a Amana Prestige RCE60C2A . I want you to check the literature. I'll explain in a bit.
2) I need to figure out why the outdoor fan on the condensor unit stops running after a few minutes of operation, and won't restart with the "pencil/stick" trick. I've already examined a variety of things.
Two months ago HVAC tech replaced my first capacitor in my Amana Prestige RCE60C2A with a 80+5 MFD capacitor. A week ago my AC stopped working: the compressor would not start. I checked the capacitance of the installed capacitor and determined it had failed. I was advised on JustAnswer to replace this capacitor with a 40 + 7.5 MFD capacitor.
I installed the 40+7.5 MFD capacitor today. The compressor started up and the house started to cool. The issue now is that after a few minutes of operation the outdoor fan stops running, eventually the compressor sounds labored, and it shuts off, probably to protect itself. As a test I attempted to restart the fan while the unit was still on by prodding the fan blades with a stick. The fan blades run smoothly but the fan will not start.
The HVAC tech's capacitor was 80 +5 MFD. The new capacitor is 40+7.5. I am wondering if it is possible the fan capacitor is supplying too much power, overheating the fan and causing the fan's thermal protection to kick in. This is why I want an authoritative answer for what the correct capacitor rating is for my unit.
If the capacitor isn't the issue, I would like to figure out what is wrong. The fan seems to run correctly while it is running.
I went into the attic and very carefully cleaned the fins around the evaporator coils on the indoor unit. They were not particularly dirty and I don't think this was the problem.
Filters have been replaced and are clean. The system is about 6 years old.
Hello, Do you have a current meter so that you can measure the current the compressor and the fan is drawing? I am assuming you have a 5 ton single phase unit that is why an 80 MFD capacitor was installed by the first tech and it lasted 2 months. And the fan capacitor was 5 MFD.
Now, after 2 months, you were able to check that the 80+5 MFD failed and was advised to replace it with a 40+7.5.
Now the fan is quitting after a few minutes. My theory is the fan is drawing too much current because the capacitor increased from 5 to 7.5 MFD. That is why you would need a current clamp meter so you can know what are the actual current the fan motor is drawing. I would suggest that you replace again the 7.5 MFD capacitor with a 5 MFD capacitor. I am just worried about the 80 which was reduced to 40.
For me, I would say 40 is a little bit low for a 5 Ton unit and I would only put a 40 MFD to a 3 ton unit. Even though the compressor did run, I would suggest that you replace the capacitor back with the 80+5 MFD then take the current draws of the components and we can observe and discuss further what could be done based on the current readings.
I suggest also that you clean the condenser coil. A dirty condenser would contribute for the capacitor to fail.