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Old 07-11-2021, 04:55 PM   #1
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1993 Bounder transfer switch

It appears that my transfer switch has died. Before it finally kicked the bucket, it was humming really loudly—both when plugged into shore power and when running the generator.

So now I’ll need to replace it, but to save money, I want something that is a direct replacement. I don’t want to have to upgrade a bunch of other components. I partially removed the electrical panel to see if I could see any markings, but I couldn’t find any model numbers on anything. I CAN see that the electrical panel is manufactured by Parallax and it’s the “Model 80”.

Does anyone know what the original transfer switch make/model is? Or, what transfer switch could be used as a direct replacement?
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Old 07-11-2021, 07:12 PM   #2
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Ok, a transfer switch, is normally located at a junction of shore power and genset power , usually in the shore power cable bay .

From your description, Iím not sure if you have found the transfer switch.

Can you post a picture of what youíve found ?
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Old 07-11-2021, 08:14 PM   #3
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My 1999 had the ATS screwed to the top of the circuit breaker box.

My 2017 has the ATS on the curb side of the RV, a few feet ahead of the breaker box.

They can be anywhere.
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Old 07-11-2021, 09:15 PM   #4
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A Parallax Model 80 is a 30 amp power distribution center/ breaker panel. Parallax manufactured an ATS that mounted directly to that model of panel, the ATS-301. You will need to determine whether that is what you have. Here is a link to a source for the ATS 301.


https://rvelectrical.com/product/30amp-transfer-switch/
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Old 07-12-2021, 01:08 AM   #5
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I can confirm that the ATS is mounted directly to the back of the power distribution panel so I’m pretty sure the ATS-301 is what I need. I will check again when I have a chance and report back.
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Old 07-21-2021, 05:27 PM   #6
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Successfully replaced transfer switch!!

So I can report that the ATS-301 is a direct replacement for the unmarked unit that was attached to the back of my power distribution panel. It was a very straightforward process to replace the old unit using the included instructions. The new one fit perfectly and bolted on using the same mounting holes and screws.

The whole thing took about 45 minutes and now I've got my 110v electrical system operational once again!!

Thanks all for your replies!!!!
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Old 07-21-2021, 08:50 PM   #7
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Thanks for getting back with the outcome. Glad it worked out for you. Sounds like a successful project.
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Old 07-27-2021, 10:04 PM   #8
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I too am having power transfer issues

We bought our 2014 Fleetwood Boulder in 2020. Since purchasing, we have had infrequent issues with the relay delay.
Recently, we are on the road and having continued issues, when we are initially connecting to shore power, we have to run generator for quitea a while. . Eventually, shore power is activated. The other night, we had to run the generator all night.
I had a phone conversation with a RV tech and he thought that 1 of the relays might be overheating. I don't understand how that could be happening, it's not like we lost power; we never had it to begin with.
.
We have experienced this issue on our first two park stays. We have 15 more parks scheduled.

Please someone have an answer for us
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Old 07-29-2021, 03:52 AM   #9
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Quote:
Originally Posted by EddieM View Post
We bought our 2014 Fleetwood Boulder in 2020. Since purchasing, we have had infrequent issues with the relay delay.
Recently, we are on the road and having continued issues, when we are initially connecting to shore power, we have to run generator for quitea a while. . Eventually, shore power is activated. The other night, we had to run the generator all night.
I had a phone conversation with a RV tech and he thought that 1 of the relays might be overheating. I don't understand how that could be happening, it's not like we lost power; we never had it to begin with.
.
We have experienced this issue on our first two park stays. We have 15 more parks scheduled.

Please someone have an answer for us

Eddy,
Are you able to troubleshoot electrical problems? You need a volt meter. First who makes your transfer switch? Some systems have a "power shedding" controller. if the total AC load is too high the controller will start turning off AC circuits...make sure all the circuit breakers are on prior to connecting the shore power or generator power, IF a shedding controller is installed and detects a circuit is off the controller will go into a infinite loop and will not power anything up! I found this out when the inverter/charger circuit breaker was off.


Trouble shooting the Transfer switch-. Do you have the transfer switch manual? If not download the manuals for your AC power system. First locate the transfer switch. Big box with 2 big relays (contactors) inside. It will be connected to the shore power cord, generator and circuit breaker panel. With shore power cord unplugged and generator OFF, do a visual inspection inside the transfer box, look for burnt wires, verify all connections are tight (loose connections /wires loose screws). This will cause over heating. Verify the relays move in and out with little physical effort. Next, apply shore power and being careful, measure the voltage into and out of the shore power relay. Should be 220-240 VAC. Note: one relay is for the shore power and the other one is for the genset. If all good verify power to the circuit breaker box and determine if you have a power control system, Locate that and again check all connections...keep us posted.
John
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Old 07-29-2021, 04:07 AM   #10
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Eddy, Typical AC diagram with Transfer switch, controller, circuit breaker panel. Use as an EXAMPLE ONLY. John


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