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Old 06-13-2010, 08:10 PM   #29
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1984 31' Airstream310
College Station , Texas
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Generally satisfied w/ac's but ......

My 84 310 is equipped with two 13.5 colemans. It has a 7kw generator. On generator only, It will push both units for a while; then, bog down and quit. The amount of running time is inconsistent. Any suggestions?

PD
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Old 06-14-2010, 12:28 AM   #30
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Question Time to replace our A/C units on the 310

PD:

I would have your generator checked and tuned before I replaced A/C units. If you DIY check the points, set the gap, clean or replace the plugs properly gapped first. Also, don't forget to check the hours on your Gen, as it may need de-carbonizing too along with the tune up.

Mike
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Old 06-14-2010, 08:02 AM   #31
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Originally Posted by pdallas View Post
Generally satisfied w/ac's but ......

My 84 310 is equipped with two 13.5 colemans. It has a 7kw generator. On generator only, It will push both units for a while; then, bog down and quit. The amount of running time is inconsistent. Any suggestions?

PD
It sounds to me like your unit is probably bogging down when both air conditioners kick the compressor on at the same time.

Someone pointed out to me the best way to run two air conditioners on a genset is to turn one on and set it for full cold. That should keep it from cycling the compressor on and off. Then turn the second air conditioner on and set it to a lower temperature and let it do the modulating to keep the coach cool.

Keep us posted on how you resolve the problem.

Brad
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Old 06-14-2010, 06:27 PM   #32
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1984 31' Airstream310
College Station , Texas
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Generator has been tuned. Carb overhauled. Probably 1000 hours on unit.

Idles OK, and then runs really smooth with one unit on for 20 min. After ten minutes this evening with second unit on, the generator bogged down and quit. Nothing changed on the a/c units prior to the gen. quitting. Gen starts right back up and runs smooth after failing.

Any other thoughts?

Thanks, PD
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Old 06-14-2010, 08:11 PM   #33
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Thumbs up Time to replace our A/C units on the 310

PD:
My Onan 6.5 did the same thing and the condenser was bad and ruined the coil. After tuning, the gen has to be adjusted with a load bank (which I didn't have) and after adjusting with load and no-load it runs fine. The load bank thing makes all the difference. Good Kohler techs are hard to find too.

Mike
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Old 06-15-2010, 06:58 AM   #34
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faulty unit

Had the same problems with my orig 13.5 colemans on my 345. Long story short, put a amp meter on the units and watch for 10 20 minutes or until they kick off. I found one of mine began to increase the suggested amps and tripped the gen braker. Finally had to replace the rear unit. Also for a piece of mind, double check the voltage comming from the gen. My got squirly - had to replace the voltage regulator. Pricey part!
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Old 06-16-2010, 09:23 PM   #35
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1984 31' Airstream310
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Extra Extra Read All About It!

AS owner catches a brake! Yes! It can happen.

I found a guy in town who knows what he is doing! He cleaned the commentator and also via meter determined genset was running too slow. He increased the speed and now the bad boy produces the desired 60 hz's. I ran the two a/c units for 1 hour plus. Almost started to cry!

Thanks all for the valuable input. Next, I want to re-wire so I can run both a/c's on shore power!

Any suggestions?

PD
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Old 06-24-2010, 02:45 PM   #36
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Thumbs up Time to replace our a/c units on the 310

PD:
Look back at the thread on my 310 where the wiring was given to do thye rear a/c. It's simple, but you end up with 2 power cords when on shore power, but that's better than cooking inside the silver bus.

Mike
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Old 06-26-2010, 09:50 AM   #37
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1984 31' Airstream310
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Bummer: I am crying now!

Went out this am just to let things run awhile and now I can't get both a/c's to run. With genset running smooth, the only a/c that works is the one getting power from the rotary switch. I went back and forth with each a/c working very well on r/s, but then could not get the other unit to kick in at the same time!

Help! I need someone! Help!

PD
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Old 06-27-2010, 07:43 AM   #38
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Bummer: I am crying now!

Went out this am just to let things run awhile and now I can't get both a/c's to run. With genset running smooth, the only a/c that works is the one getting power from the rotary switch. I went back and forth with each a/c working very well on r/s, but then could not get the other unit to kick in at the same time!

Help! I need someone! Help!

PD
Check for a tripped circuit breaker on the generator itself. It should have two circuit breakers, one for each leg of the generator power. When you're using the rotary switch you're always using the same leg. When the generator is running the isolation timer relay for the generator controls the 2nd leg.

There is also a circuit breaker near the generator isolation relay that might have tripped but I'm thinking if that one was tripped the air conditioner wouldn't run at all so I'm betting on the breaker located inside the generator compartment on the generator.

Let us know what you find out.

Brad
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Old 06-27-2010, 01:55 PM   #39
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Bras: I had gone through the motions of resetting all the breakers. They appear to be OK. Since the genset seems to be hitting on all cylinders, I get the feeling the relay is stuck closed. Is this possible? Where are those relays located?

Thanks,

PD
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Old 06-27-2010, 04:12 PM   #40
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Bras: I had gone through the motions of resetting all the breakers. They appear to be OK. Since the genset seems to be hitting on all cylinders, I get the feeling the relay is stuck closed. Is this possible? Where are those relays located?
PD
Since this is a mechanical relay anything is possible. The relay/transfer box for our 310 is located in the compartment next to the generator compartment. Not sure on a 345. Try and follow the wires from your generator compartment into the coach. The relay box should be located there.

I've attached some sketches on how our 310 was wired using the relay boxes.

Hope this helps.

Brad

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Old 06-27-2010, 06:10 PM   #41
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1984 31' Airstream310
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Thanks Brad for the schematics. I went back to the basics! Took the 2 hot wires form genset loose and cleaned them a little. Fired up the unit and after slight delay, both units produced 12 volts. Put it all back together and, Oh MY! It all worked. The genset pushed the front a/c unit, then, after, a moment I heard the click of the relay and then; the rear unit would fire and cool. Somebody is laughing at me somewhere, but I am not amused.

Thanks again for taking time out of your Sunday to help!

God Bless,

PD
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Old 06-28-2010, 08:11 PM   #42
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Glad you got it going again! And I'm glad to help when I can.

Brad
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