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Old 06-18-2016, 07:29 PM   #1
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15,000 BTU AC vs Yamaha 2400 inverter

I have a Yamaha 2400 inverter generator that I bought to charge batteries and occasionally run the 13,500 btu AC in my old trailer.

Earlier this week, I tried our New Jayco, 29.5 BHDS HT 15,000 btu AC and it wouldn't go. It would try, but would trip out the generator every time. Even with all the breakers off but the AC.

After doing some research, I read that my AC should have had a start capacitor from the factory. This didn't seem right. Yesterday I had a chance to get up on the roof and investigate. All I found was a run capacitor and a fan capacitor. So I found a place locally that sells the Supco SPP6 start capacitor and picked one up this morning for under $20.

Just got done installing it. Tested it on shore power to make sure it still worked and it did. Went out to the garage and got the Yamaha 2400 threw it in my truck, fired it up and drove up to the camper. Plugged it in, went inside and turned the fan on first, then flipped the air on with my fingers crossed (didn't flip any breakers to limit 120v usage). She started right up!! Didn't even really rev the engine in the generator up very much either. It's outside pouring away as I type this. Wanted to give it a workout and burn out the older gas (with additive in it).

Looks like we'll be sleeping comfortably if we encounter hot weather on the road on the way to or from Glacier!!

Was an easy install. Pull the shroud, pull the control cover, plug in two wires, secure the capacitor (zip tires) and put it all back together. Didn't get a picture of the installed capacitor though.

Makes a world of difference!!
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20160617_203339.jpg   20160617_203200.jpg  
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Old 06-19-2016, 08:30 PM   #2
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It's rather hard for me to see the diagram, which color wires went to the start capacitor. Did they have end already on them or did you have to crimp some on? Glad you had success. I was wondering if that generator had what it takes to start the 15k.
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Old 06-19-2016, 09:15 PM   #3
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If you click on the pictures, they should open bigger.

The SPP6 has female blade terminals attached to the two wires already. The run capacitor, the left one in the picture, has 4 male blades on each pole. The capacitor plugs into one of the free blades on each pole. I read somewhere that the lead with the piggyback connector (female blade with a male tab sticking off it) goes on the pole that has the red wire. That's what I did and was successful.

By comparing the wire diagram that is on the control cover and the wire colors, you can figure out what is what in there.

Only things I needed were a Philips screw driver and 2 zip ties.
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Old 06-19-2016, 09:17 PM   #4
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Oh, we will need DETAILS on this mod, Sir! What is the capacitor that you added? Who was your supplier? Is it that intuitive as to where to plug it in?

This looks like a mod that many of us will be interested in....
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Old 06-19-2016, 09:31 PM   #5
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Quote:
Originally Posted by Fire_Instructor View Post
Oh, we will need DETAILS on this mod, Sir! What is the capacitor that you added? Who was your supplier? Is it that intuitive as to where to plug it in?

This looks like a mod that many of us will be interested in....
Here is the Hard Start Capacitor:

Supco

One that page, you will see an orange button that says "find local distributor" or you can buy online, I know Amazon had them cheap. But in my case, fast and 2 miles from my house trumped cheap. Mine was $19 and some change.

IMPORTANT: you want the SPP6 (not the SPP6E)

The package tells you to place one wire with the yellow and the other with the red. I read somewhere that the capacitor lead with the male spade coming off the female connector should go to the red, so that's what I did. There will be multiple male spades on the run capacitor. Just use a free one, they are interconnected.

So once you open up the unit, it's pretty easy. There will be a metal cover that is held on buy a couple screws and the electronics are behind it. The back side of the cover should contain a wiring diagram. If you use the diagram and wire colors, you can determine what parts are what.

It's a simple job. Hardest part is taking the shroud off, and even that isn't that bad.
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Old 06-19-2016, 09:34 PM   #6
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I had just pulled my manuals out to figure out how to lift the shroud.... It isn't very clear, so I guess that I need to get up on the roof....
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Old 06-20-2016, 07:23 AM   #7
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On mine, there are 4 screws on the top towards each corner. That's it. Remove the 4 screws and then pull the shroud off.
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Old 06-20-2016, 01:37 PM   #8
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Cdash, thanks for posting this and the clarification. Once I looked at it with my tablet it made all the difference. I didn't want to have to buy a larger generator if I was able to get by with a smaller one. There just doesn't seem to be as much info about running the larger 15k generators as there is with the 13.5k on these forums.
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Old 06-20-2016, 01:42 PM   #9
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That's great info. I have been wondering for a long time if you could run the AC with less generator if you added a hard start capacitor. I'm thinking it might make things easier (better for your equipment) all around even if you have plenty of generator.
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Old 06-20-2016, 02:33 PM   #10
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Quote:
Originally Posted by Fire_Instructor View Post
I had just pulled my manuals out to figure out how to lift the shroud.... It isn't very clear, so I guess that I need to get up on the roof....
As 'Cdash' mentioned on most model A/C's there are 4 screws on top of the plastic shroud......, but depending on the manufacture of the A/C upon removing the 4 screws there may also be some metal clips along the frame base (sides & front) of the A/C. The bottom edge of the plastic shroud snaps over the metal clips...., you may have to help the plastic edge over the clips.

Important: When reinstalling the plastic shroud make sure it is properly seated "under the clips" before installing the 4 top screws. There have been cases where the front part of the plastic shroud sustained damage due to the wind lifting the shroud away from the A/C frame.

I had my A/C shroud off last week to clean the condenser coils....., getting my 11 year old A/C shroud seated back under the "front" metal clips was a little challenging.

FYI: Condenser Coil Cleaner......, 14 oz. Condenser Coil Cleaner-WCOIL - The Home Depot

Bob
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