Re: Climma Air Conditioning from shore power



You definitely have a ground fault in some device on your boat. A ground fault will trip a pedestal breaker in a marina much faster than a ground fault will trip the main breaker on your 220-volt panel because the sensitivity for ground faults in a marina is very high, especially in the US where marinas do not want to be sued for injury.

I suggest you get an electrician to isolate which device is causing a ground fault.
The most common is the water heater which develops pinholes in the heating element, and the second most common is the Climma AC/Heat units. There are many different causes of ground faults in the Climma units with the most expensive being a ground fault inside the compressor.

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On Tue, Feb 2, 2021 at 4:44 PM Peter de Groot <pandmdegroot@...> wrote:

I’m hoping someone has run into this before, and can shed some light.  I have the feeling the answer is staring me right in the face and I just can’t see it.

For 3 years of owning la Querida SM#207 I’ve always run the heaters and Air Conditioning from generator power.  The marina where I was berthed only offered a 30A 120VAC circuit.  Now that we’re in Mexico, we’ve had occasion to run the water heater and Air Conditioning from shore power.  It has not gone well.  Upon plugging into shore power the breaker on the side of the 220VAC load center in the galley immediately tripped.  Mind you this is North American 220(230) VAC with two hot legs and no neutral.  Together with an electrician we found the offending circuit and disconnected the blue (normally neutral) wire and all circuits worked except the Climma air conditioning.  Restoring that connection A to B in the diagram above, the Air conditioning works being powered from the generator.  However the main breaker trips immediately when connected to shore power.  Power feed “1” comes off the main power distribution, no circuit separate circuit breaker.  Power feed “2” comes off the “Climma” individual breaker on the Amel Panel.

Measuring voltage from “B” to a brown junction point reads 125VAC.  From “B” to a blue wire junction point (normally neutral) also reads about 125 VAC.  “B” to ground is open.

The electrician did his work three ports ago (and we were sailing the next day) when our priority was to get the hot water heater to work without bothering the neighbors with generator noise and exhaust.  Now our priority is getting the air conditioning working from shore power.  We’re much further south and the cabin is a sauna most evenings.  The previous owner was on board for a week in Zihuatenejo and reiterated he was able to run all circuits (including the air conditioning) from shore power.  He also did his cruising in Mexico with 2 hot leg 230VAC power.

Any tips or similar past experience/solutions would be welcome.

Peter de Groot
la Querida, SM#207
now in Barra de Navidad
(just back from Ixtapa where the mosquitoes forced us to close the hatches making the problem worse)

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