Question about Dometic Rooftop RV Air Conditioner

5 Answers

When i turn on a/c it trips the breaker

My trtailer has both front and rear a/c units. they were both turned on but was only hooked up to a 30 amp service. Now when a/c is turned on you hear a excessive load on the generator. Sometimes trips breaker, sometimes runs fine. help?????

Posted by on

  • 4 more comments 
  • bbambarger Jul 20, 2009

    never had a problem until it was hooked up to 30 amp wervice. i know it should have been a 50 amp. but the wife did not...

  • bbambarger Jul 23, 2009

    the generator is a onan 5500 marquis gold. The problem is on start up only. when i go to fire up the rear a/c unit it will trip the breaker more often than not. it seems like it has something to do with the fan or compressor start up. when the a/c runs it operates normal. i read something about a start up capacitor??? we never had a problem running one or both A/C units until the last trip when they were both turned on at a 30 amp hook up. the front a/c i believe is 10,000 btu and it fires up without a problem. The rear is a 15,000 btu and is the one i am having problems with.



    F.Y.I. I just replaced both circuit breakers so i know that is not the issue.

  • bbambarger Jul 23, 2009

    i do understand what you are saying. the altitude is not an issue because we are at home and it has never been a problem before. i was mistaken on the front a/c. it is 13,500 btu. with everything off lights, fridge, etc.. and the fan on low it still trips the 30 amp breaker. Not sure what to do. we will be leaving for a trip tomorrow.



    note: when the start up is succesfull the a/c works great. i can usualy get the a/c to start if i go to the generator and reset the breaker. help?????

  • bbambarger Jul 23, 2009

    help????

  • bbambarger Jul 23, 2009

    i don't believe the problem is in the generator. i believe it is the rear a/c unit. The generator handles the microwave ,all the lights, overhead fantastic fan, and ceiling fan with ease. It's when i go to fire up the rear A/C unit that i have the problem.

  • bbambarger Jul 25, 2009

    my generator is equiped with 2 30amp breakers. it isa required to have a 50 service in order to run both a/c units at the same time. we were hooked up to a 30 amp hook up when my wife turned both units on. ever since this happened i have had an issue with starting the rear air.

×

5 Answers

  • Level 3:

    An expert who has achieved level 3 by getting 1000 points

    Superstar:

    An expert that got 20 achievements.

    All-Star:

    An expert that got 10 achievements.

    MVP:

    An expert that got 5 achievements.

  • Master
  • 4,924 Answers

Did you checked if they are hooked up in a parallel connection ...not in serial ...cause in this way they will over run the generator...

Posted on Jul 25, 2009

  • Level 3:

    An expert who has achieved level 3 by getting 1000 points

    Superstar:

    An expert that got 20 achievements.

    All-Star:

    An expert that got 10 achievements.

    MVP:

    An expert that got 5 achievements.

  • Dometic Master
  • 32,281 Answers

You mentioned that this was a 50amp circuit breaker, why is a 30 amp breaker installed instead of a 50 amp breaker?
The 30amp breaker is tripping because the startup load exceeds 30amps. Put back a 50amp circuit breaker and your problems should go away unless you have an electrical fault.

Posted on Jul 23, 2009

  • Level 3:

    An expert who has achieved level 3 by getting 1000 points

    All-Star:

    An expert that got 10 achievements.

    MVP:

    An expert that got 5 achievements.

    President:

    An expert whose answer got voted for 500 times.

  • Master
  • 1,734 Answers

I guess the A/C startup stresses the generator a bit to much. First of all check the oil pressure of your generator. Second step: your generator model has a start button with a red light in the center that will flash if something is wrong with the unit. Onans have a self-diagnostic capability and when something goes wrong, the control board shuts the generator off and that little red square light in the start button will flash a trouble code similar to the way earlier cars did (the dashboard computer light will flash a trouble code like "32" or "25"). The way to tell the code number is to count the number of flashes after the gen stops running: for example, code 32 will be three flashes one after the other, a short pause with no flashing light, and then another two flashes indicating the number two. The Onan service manual has descriptions of these codes.

Posted on Jul 23, 2009

  • Level 3:

    An expert who has achieved level 3 by getting 1000 points

    All-Star:

    An expert that got 10 achievements.

    MVP:

    An expert that got 5 achievements.

    President:

    An expert whose answer got voted for 500 times.

  • Master
  • 1,714 Answers

When they ran from a 30 amp service they ran okay, right? I mean they didn't trip the breaker on the service right? This seems fine, if you overloaded the circuit feeding the trailer, it would have tripped.
Now you say that it seems that they load the gen down quite a bit? They didn't do this before you ran from the 30 amp service? It might be a coincidence. What I need to know is the BTU rating of both AC units and the gen KW rating to see if you are in fact, overloading it.

Posted on Jul 20, 2009

  • 1 more comment 
  • Craig Butler
    Craig Butler Jul 23, 2009

    The rear unit you should always start first, it needs all the gen it can get. The A/C units compressor pulls double or more to start the compressor, then drops back to normal. That's why it trips starting. Always turn everything that's running OFF when you go to start the A/C, then bring stuff on after she's running. You may be at higher altitude now too, that will change the engine on the gen set output HP. Try these suggestions and get back to me.

  • Craig Butler
    Craig Butler Jul 23, 2009

    Converting your BTU's for the two units indicates your pretty well maxed out too, for that size generator.

  • Craig Butler
    Craig Butler Jul 23, 2009

    Here are some facts for you about your wattage and BTU loads:

    15000 BTU A/C start up is 3300 watts
    Running watts: 2000 watts

    10000 BTU A/C start up is 1500 watts
    Running is about 1000 watts

    This uses a big share of your generator power. Remember too, you loose some HP from the engine (and gen) at altitude.


×

  • Level 3:

    An expert who has achieved level 3 by getting 1000 points

    Superstar:

    An expert that got 20 achievements.

    All-Star:

    An expert that got 10 achievements.

    MVP:

    An expert that got 5 achievements.

  • Master
  • 15,935 Answers

Make sure you have enough headroom for the breaker.
Shoot for 5-10A above the current draw of the unit.
Also - after multiple resets - breakers should be replaced - as they become weak and trip easily.

Thanks

Posted on Jul 20, 2009

  • blueextc3221
    blueextc3221 Jul 24, 2009

    Have you tried to independently turn on the rear AC unit with nothing else powered on?
    Most likely if you feel it is the Unit, and not the LOAD on the breaker, the compressor or motor is in early stages of failure.

    This follow-up contact letter is in regards to the problem you submitted to FixYa.
    Please return to your account and accept my solution If it best answered your problem -
    As unrated questions older than 7 days are credited to the first expert that attempted to answer your question...
    even If it was unhelpful or didn't address your question whatsoever.

    Thank you for using FixYa!!


×

1 Suggested Answer

6ya6ya
  • 2 Answers

SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

Hi,
a 6ya expert can help you resolve that issue over the phone in a minute or two.
best thing about this new service is that you are never placed on hold and get to talk to real repairmen in the US.
the service is completely free and covers almost anything you can think of (from cars to computers, handyman, and even drones).
click here to download the app (for users in the US for now) and get all the help you need.
goodluck!

Posted on Jan 02, 2017

Add Your Answer

Uploading: 0%

my-video-file.mp4

Complete. Click "Add" to insert your video. Add

×

Loading...
Loading...

Related Questions:

1 Answer

When you turn on the rear ac it sounds like it humms and then trips the breaker. Any ideas? Thanks, John


it could be the capacitor gone bad. without it the compressor can draw lock rotor amps.

Aug 02, 2014 | Coleman Dometic Duotherm Rv Air...

1 Answer

When the welder is first turned on I can weld with gas for about 5 seconds. Then the breaker trips. ( i have the proper wiring and breaker). The more times I reset the breaker the shorter the weld time...


Hi:
Just make sure that if you are using an extension cable between your machine and the power outlet, this cable is at least a 12 gauge size, if you are using a 14 or 16 it's too small to handle the amps.
Other point is to check that your breaker is 20 or 30 Amp capacity.
Hope this help.

Sep 08, 2011 | Clarke Power Products Clarke 130EN...

3 Answers

I have a raka-037jaz air cond. I was wondering what size is this unit? And if my breaker keeps tripping for the outside condenser does that mean my compressor is workIng too hard and needs to be replaced?...


Hello You have a 3 ton unit with a 10 SEER rating.this unit should NEVER be on a 50 amp breaker.The breaker size is on the model plate/sticker....any way the compressor is shot and it is time to find a new 3 ton condensing unit.espescially if it is TRIPPING a 50 amp.Good luck

Jun 17, 2011 | Heating & Cooling

1 Answer

How to hook up single pole shunt tip breaker in panel


To be very safe, turn OFF your Main circuit breaker prior to doing this. This IS really important! You asked how to hook up the breaker, so I'm going to assume you already installed this. The first wire that you'll want to land under a screw is your ground (green) wire. This wire should be where all your ground/green wires are. Next, you're going to bring your white (neutral) wire to the neutral bar.  You should see other white wire's terminated (attached under screws) there. Then, bring your colored (ie usually a black or red) wire and attach it to your circuit breaker. Make sure that you are using a #10 guage wire. This wire guage is rated for 30 amps. If you're using a 20 amp circuit breaker, then use a #12 guage wire. And a #14 guage wire for 15 amp circuit breaker. Using these wire guages satisfy all electrical requirements (codes). Now, leave the circuit breaker in the OFF position, and close up your panel. After closing it, then turn ON your Main circuit breaker. If everything is fine, great! Before you turn on your circuit breaker, make sure the switch, device, receptacle (unplugged), is OFF. Then go to your electric panel and turn ON the circuit breaker. If the breaker holds (doesn't trip), then try your switch, device, or receptacle to see if everything works. One last thing to remember is, if you're using a 30 amp circuit breaker, then the device on the other end should only draw up to 24 amps. Meaning, don't put a 30 amp cir. brkr. on a 20 amp recectacle, switch, or device. For a 20 amp cir. brkr., 16 amps is the maximum load you can put on this. I hope this helps you. Just read it through once, and then highlight the main parts of this and you should do fine. Good Luck, and feel free to contact me if you'd like further assistance. - Jim

May 19, 2010 | Cutler Hammer Circuit Breaker, 30 Amp 120V

1 Answer

Unit comes on and runs for 5 minutes, the circuit trips off


30 is the correct size breaker for this unit. It sounds like there is a grounding issue going on in the system. Or off of the Thermostat. Something is grounding out causing the switch to trip. Are you running #10 wire to breaker and the unit? If not you will need to increase your wire size

Jan 03, 2010 | Dayton D-F79 Electric Space Heater- the...

1 Answer

My electric furnace keeps tripping the breaker , it will run for about five or ten minutes then trips.


If you dont have an ampmeter it is hard to tell whats going on. First check the breaker and see if it is getting hot. If so turn off power get a screwdriver and check to see if wire are tight on the breaker. Loose wires cause breakers to trip. If the unit has ran before and it has not tripped the breaker and it hss just now atarted replace breaker but do not put a larger one in. Check the size of your heat strip in Kw or what they call for on the size of the breaker. 10 kw no larger that 60 5kw no larger than 30. 15 kw has a 60 amp and a 30 amo circuit. Let me know whats going on.Rus

Dec 07, 2009 | Refrigerators

5 Answers

Have roof top air conditioner that blows air but soon trips breaker. any suggestions? Henry


check the condensor fan in the rooof unit. It's the fan blowing on the cpil on the roof.. If it failed, the head preasures can becme excessive andwork the compressor hard causing the breaker to trip. Let me know and good luck, Ned_

Sep 13, 2009 | Dometic Rooftop RV Air Conditioner

1 Answer

Central AC unit replaced breaker trips after running 20min


Unit is drawing two may amps for the breaker. Could be compressor sticking.

Jul 22, 2009 | Weather King 10AJA6001AH Air Conditioner

3 Answers

Frigidaire compact 30 elec. stove. I need a wiring diagram for the front connections for oven, burners, oven lights. My oven isnt working and when I removed the front cover, noticed a wire not connected. ...


Does yours have the timer/clock thing that stands at the rear left of the stove? If so, make sure the far right dial is set at Manual. I had a repair person come out once (luckily it was someone I knew who didn't charge me) because my oven quit working. He turned the dial to manual and presto! :)

Sep 19, 2008 | Kitchen Ranges

Not finding what you are looking for?
Dometic Rooftop RV Air Conditioner Logo

Related Topics:

191 people viewed this question

Ask a Question

Usually answered in minutes!

Top Dometic Heating & Cooling Experts

Bill Long

Level 3 Expert

587 Answers

Donni Steen

Level 3 Expert

659 Answers

mike cooper

Level 3 Expert

884 Answers

Are you a Dometic Heating and Cooling Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides

Loading...