Supco Hard start capacitor on Coleman A/C

General rule for capacitors; voltage rating of a cap is not important as long as it is greater than what your using it for. It's like having a higher rated wire insulation.
In this case the voltage rating has no impact on the operation of the capacitor and its circuit.
It's the capacitance value that is critical.

Dutch_12078 wrote:
The SPP6E works fine on my Dometic/Duo-Therm 13.5 A/C's. The capacitance of the SPP4E and the SPP6E are the same, and I went with the recommendations of RV Tech Chris Bryant in choosing the 6E's. The packages I bought show the voltage rating as "90-277VAC". On my A/C's, the smaller round black capacitor is the compressor start capacitor in series with a Cera-Mite PTCR. Both were replaced by the SPP6E. The larger three terminal capacitor is the run cap for both the compressor and fan motors. My Honeywell digital thermostats prevent "instant" A/C restarts anyway, so that's not an issue.

Yes, my diagram shows the small (2 wire) as the start capacitor and the large (3 wire) as the run capacitor.

FYI, A/C works fine plugged into an outlet, just won't start with my 3,000 watt generator. Same generator I used all of last year.

The SPP6E works fine on my Dometic/Duo-Therm 13.5 A/C's. The capacitance of the SPP4E and the SPP6E are the same, and I went with the recommendations of RV Tech Chris Bryant in choosing the 6E's. The packages I bought show the voltage rating as "90-277VAC". On my A/C's, the smaller round black capacitor is the compressor start capacitor in series with a Cera-Mite PTCR. Both were replaced by the SPP6E. The larger three terminal capacitor is the run cap for both the compressor and fan motors. My Honeywell digital thermostats prevent "instant" A/C restarts anyway, so that's not an issue.

DO NOT use the SPP6E. It is rated at 190 - 277 volts, while the SPP4E is rated at 90 - 130 volts.

Quote from Supco website.

5 Elite Versions
Providing a solution for any HVAC/R application


• SPP4E
Recommended for 1/8 to 1hp 90V - 130V
• SPP5E
Recommended for 1/3 to 2 hp 170V - 277V
• SPP6E Recommended for 1/2 to 3 hp 170V - 277V
• SPP7E Recommended for 1 to 4 hp 170V - 277V
• SPP8E Recommended for 1 to 5 hp 170V - 277V


I also found this Youtube. I guess he is using the wrong capacitor too.

https://www.youtube.com/watch?v=7cEaPdvzU04 and he shows how to connect the wires to the capacitor. But is using the wrong capacitor. 3 minutes and 1 second into the video, stop it and you can read the package says 190 - 277 volts.

Beyer wrote:
I have a 1996 camper with a Coleman A/C. I bought the Supco SPP6E. My A/C has 2 round capacitors, one small and one large. The small one has 2 wires and the large has 3 wires. Which one do I replace? Both?
Pics:

http://i1372.photobucket.com/albums/ag321/beyer25/Mobile%20Uploads/image_zpsf3f66b5c.jpg

The small capacitor with wires going to the outside fan is the wrong capacitor. THe one with wires going to the compressor is the correct one. Typically the red and another color wire go to the compressor along with a black one. Don't connect to the black one. Use the red wire and yellow wires. You want those two connections.

You do NOT take out the factory capacitor, just add the second one to the compressor circuit to help shorten the time it spends in "Locked rotor" amperage, and shorten the time it takes to get up to full speed.

Make SURE that you put a screw into the existing capacitors tie down strap, or it can short to ground if the metal from the wires shorts our to the metal of the clamp.

If your compressor is not working right, then replace the small round capacitor with the red and yellow wires on it. It might be 25 MFD or 35 MFD, replace with the same size. Shape is less important, you probably can find one for about $10 that is oval, or round one for a couple bucks more.

Fred.

gmctoyman wrote:
Do you connect it to the existing, or replace the existing ?

X2
Add to it or replace it?

Do you connect it to the existing, or replace the existing ?

You want to connect to the large capacitor with the red and Yellow wires. The small one is the fan capacitor.