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Marine Air Tripping Circuit Breaker
September 2, 2010
7:18 am
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Steve Pooler
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Forum Posts: 1127
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November 12, 2008
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Marine Air did not use Start Capacitors in the self contained units in 1994…Cruisair did, and yes Cruisair started easier…

You can add a hard start kit to your unit which consists of a start relay & start capacitor all in one with just two wires to plug on to the existing run capacitor….They are available from any commercial/residential A/C supply house…(Cruisair/Marine Air does not offer them)

Edit: Dometic (Cruisair & Marine Airr) Now offer a patented product called SmartStart that can be added to any A/C, and is much more effective than the above mentioned standard start kits...I have installed many & can vouch for the claims: /marketplace/marine-air-conditioning-marketplace/smartstart/cruisair-smartstart-marine-ac-compressor-soft-start-hard-start-assist-by-dometic/

What size is, and how old is, the breaker supplying the A/C in question…It could be that over time that breaker has weakened or is heating up causing it to trip….Feel it to see if it's warmer than others…That's a sign its headed south and you need to replace it. 

There are many factors can cause a A/C unit to trip a breaker…I have no simple answers here other than to try the above…Without testing with a volt/amp meter, and then maybe waiting till the middle of the night for when it happens….Don't laugh…I have had to do this before Embarassed and it's not much fun.

Sometimes it's even a pump motor overheating that causes the pump to shut down after hours of run time...The unit shuts down or cycles from head pressure & on the next restart it trips the breaker because it's trying to start before that pressure has had time to equalize...You don't notice it's off till you get hot and have been asleep...By the time you notice...The pump has cooled enough that it will take right off and all is good till it happens again...

 

Steve~ 

September 1, 2010
5:02 pm
jrhall841
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Guests

Thanks Steve:

I don't think I have the trigger problem because the pump run's when just the faulty a/c is on. Unless the trigger is the thing that is failing and causing the failure once every 20-25 hours. What do you think about the capacitor being the problem and if so would it be the start or run capacitor? Is there a way to test the capacitor?

Another a/c man said that he thought my problem sounded like corrosion on the 120 volt input. The only reason I don't just clean is so hard to get at. What do you think?

Thanks again John Hall

September 1, 2010
12:07 pm
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Steve Pooler
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November 12, 2008
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I don't know where you are...But it's too hot here to even think about running heat  Cool

Seriously though...I would expect high amperage draw in heat...These systems are reverse cycle heat, but unlike home...one side is water & the other is air...when in heat they "Reverse" duties...

When running in heat mode you are removing heat from the refrigerant with the air coil in the cabin...Air is not as efficient as water at doing so, and in the summer with warm water temps there is a lot of heat in that water to pick up & git rid of in the cabin...If the cabin is hot, the air coil cannot do it so well...

Is the unit tripping that 30 amp breaker ?

Actually...Don't answer that here, as we are now taking JR's thread off in a different direction...You can start your own thread though...Just click on the Add Topic button in the troubleshooting forum, name it & post away....  Smile

Steve~

September 1, 2010
11:44 am
dazrum
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Guests

Steve: Thanks for Info. Fortunately wire is all 10 guage.
Also now unit trips when in heating mode but works fine in cooling mode

September 1, 2010
7:27 am
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Steve Pooler
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Forum Posts: 1127
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November 12, 2008
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jrhalll841~

Sounds like you may have a bad trigger, or trigger circuit in your pump relay causing the pump to not start for that unit…

Check out this article that I wrote for further explanation…I have highlighted in blue what to look for & how to verify it is the problem but the whole article is good read if you want to understand differing type/brand pump relays…

** you don't have permission to see this link **

dazrum~

We appreciate your offering help, and your participation...Welcome~

I'm glad you got yours running with just a capacitor...But your A/C people may not have done you any favors by changing your breaker to 30 amps…

Breakers should be sized to protect the wire, and not for system size, or starting current….Please check that...The wire from that breaker is at least #10 AWG, which is rated for 30 amps…If the wire is any smaller (like # 12 or 14) you should change back to the original size breaker to keep that wire from burning up & possibly starting a fire…

Steve~

August 31, 2010
3:45 pm
dazrum
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Guests

I had same problem on my Marine air unit. My AC people first changed my breaker switch to 30 amps and when it recurred I replaced the capacitor. You can replace it yourself as it is just a plug in. The capacitor resides just under the warning plate on the top.

August 31, 2010
10:43 am
jrhall841
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Guests

Nice web Site
I have a 16,000 btu 1994 Marine Air self contained heat and air conditioning system. I have three units each on a separate circuit breaker. The water pump also has a separate circuit breaker. The one pump serves all three units. Two units work fine the third trips the circuit breaker very erradicly. Some times it will run 2-3 nights no problems. Then during the night when the unit is cycling on and off most often(as opposed to cooling continuously) the breaker for that unit in the electrical panel will trip. Flip it on and usually good for another night or 2. Water flow out of boat for problem unit same as other two.

Any Help appreciated. One quote expert said try cleaning electrical connections as first step saying maybe corroded???