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Old 08-14-2010, 09:30 AM   #1
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Why doesn't new generator run A/C?

Just got a Yamaha 2400is to run the a/c in my 2005 16ft Bambi (11,000 btu). Read all the posts before purchasing and it should cool but doesn't. Nothing else is on, any thoughts from the experts on what might be wrong?
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Old 08-14-2010, 09:37 AM   #2
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Is the green generator light on or is the red overload light on?

Not sure what the issue is, as our 2400 yamaha runs our 13.5k ac (but not much else) just fine.
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Old 08-14-2010, 09:55 AM   #3
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Initially the green light comes on, but then the red light comes on. Again, I'm not testing anything other than the a/c right now. I did check to see if it would run the coffee maker and that runs fine.
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Old 08-14-2010, 10:04 AM   #4
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Mine runs the 13.5 btu Carrier 5 but while at the beach 2 weeks back it didn't want to power it so here's what worked. First start up generator and let warm up for a few minutes. Then turn on AC to low fan, no cool and let run for a few minutes. Then turn on to low AC and put themostat in the middle. After a few minutes you can begin to make it cooler. The initial power surge of the AC is what is shutting down the safety mechanism in the 2400is. By letting things start up slowly before the big load is on then the generator will be able to handle it better.

Just bought mine 2400is at end of July. My initial test when I got it had no problem with it running the Carrier 5 at hifan max cooling in the driveway so was surprised at the beach but ran it all night til it ran out of gas (about 5 hours). gotta have it here in Texas!
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Old 08-14-2010, 10:08 AM   #5
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it may be the type of plug in that you have. are you using the single 15 amp plug in with a 15 to 30 amp pigtail to your airstream power cord?

I use one of these so I can plug my airstream power cord to the genset.

Amazon.com: Dual 15 - 30 AMP RV adapter for Honda, Yamaha, & Kipor generator - convert two…
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Old 08-14-2010, 10:14 AM   #6
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I'm using the 15-30 amp pigtail.
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Old 08-14-2010, 10:18 AM   #7
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Thanks for the suggestion RichHog I'm gonna go try that and see if it works. I'm scratching my head as to why it's not working but this is my first generator so maybe I've made some basic mistake.
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Old 08-14-2010, 10:18 AM   #8
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You say you are only running the AC in the last test. Did you turn the frig to gas, several amps there. Did you turn the converter off, another couple of amps.

the starting current on the AC is quite a bit higher than the running current and it coupled with the frig and converter may be over the limit for a 2500 watt generator. The 2500 watt rating is not a sustained rating. The sustained rating is less. Not sure of the specs of your unit but my 1,000 generator will only support a 600 watt sustained load.
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Old 08-14-2010, 10:19 AM   #9
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and if you are plugging the 15 amp into one of the two plug ins on your genset, you are probably not getting enough power from the one outlet to run your AC.
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Old 08-14-2010, 10:29 AM   #10
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Good points up above. The fridge if on electric could be using some of your watts. On mine I use the 2 prong adapter that plugs into the 30 amp. connector with no problem, in fact you have to as the 2400is only has the 2 outlets on it.
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Old 08-14-2010, 10:38 AM   #11
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Tried RichHog's suggestion. No luck. There is nothing else running in the Bambi including the frig it's off. I am testing the generator before we head out for a long trip and so I'm not running anything right now.
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Old 08-14-2010, 10:46 AM   #12
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My 2400is has no trouble running my a/c, but I do as RichHog says ... make sure fridge is on propane, power down most everything else, start the fan on the a/c and then switch it over to "cool" mode to engage the compressor. The 2400is has an automatic "eco throttle" regime, so it idles down until it is loaded, and then applies only as much throttle as needed ... you might be "surprising" the circuitry with a high load, with the result that while the load is on instantly the throttle takes a second or two to respond, and perhaps it's not fast enough to cover the compressor load. At least that's my theory, and I'm sticking to it!

I've also got a larger, 6600 Yamaha, and on it, the "eco throttle" feature is switchable. So I turn it off when I know that the genset is going to get large surge loads. It works fine that way, but if I forget and leave it on "eco" mode, it too sometimes does not respond fast enough with motor starting loads, and can trip the breakers, because it's not spun up before the load hits.
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Old 08-14-2010, 10:48 AM   #13
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So does the AC unit come on at all if you set it just to low fan?

Are you powering off the generator completely to reset the protection circuit?

When you power it up do you get the green light on the genie before you turn on the AC unit? and then as you turn on the AC unit does the green light go off?

Do you have an electric water heater?
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Old 08-14-2010, 10:55 AM   #14
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I tried to switch it on "fan only" but the fan does not come on at all. It seems like when you put it on "cool" you can hear the compressor but fan does not turn on. Again, the fridge is off.
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Old 08-14-2010, 10:57 AM   #15
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Sounds like a problem with the air conditioner. Does it work on utility power?

Perhaps the fan motor is stuck. Sometimes they stick if they haven't been used for a while. Remove the shroud and turn it by hand to free it.
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Old 08-14-2010, 11:02 AM   #16
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You may have an issue with your AC unit if the fan does not run. Have you tried this connected to shore power? If the fan motor is frozen it could cause the generator to overload. It could also be a bad start cap for the fan motor.
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Old 08-14-2010, 11:04 AM   #17
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If you are turning the AC fan only on and it is not coming on your problem is not the generator your problem is in the AC.

You should be able to run the fan only. Sounds like the fan motor is your problem. Go on the roof and remove the shroud, or is possible reach in through the shroud and see if you can turn the fan blade. It should turn freely. If it does not turn freely that would stall it and run the current high.

If it turns freely the next thing to look at would be the starting cap on the fan motor. If the cap is good the motor would be suspect.
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Old 08-14-2010, 11:05 AM   #18
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Ok, now ya'll are making me think it might be the fan so I'm gonna see if I can fiddle with that. Give me a few minutes.
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Old 08-14-2010, 11:21 AM   #19
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SUCCESS! Climbed on top, removed the shroud, turned the fan blades a bit, restarted generator. Fan works great, a/c is cooling now.

Thanks so much for all the help. Did I mention it's 102 degrees in Austin today?
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Old 08-14-2010, 11:26 AM   #20
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Great news! 102 isn't that bad, we are looking at 113 today...
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