Question about Maytag Portable Air Conditioner M6P09S2A

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Unit trips circuit breaker when plugged in

This unit was purchased about 2 years ago, put in the attic storage area and brought out for 'service' last week.

When it is plugged in, sparks were seen coming from one of the prongs on the power cord. hmmmm...perhaps direct short to ground....????

Took back off the unit and checked the continuity of the power cord....not direct shorts in the cord leading to the unit.

Check the continuity of the black incoming 110 AC line to chassis short....traced this to the 35 uf capacitor...hmmmm...perhaps found the problem.

Putting the unit back together I noticed the incoming power cord had 3 wires: white, black and green. They were connected to the following terminals on the unit chasis: white>> ('L')white; black>>> ('N')blue; green>>>the ground symbol.

I then looked at the circuit diagram on the rear of the unit and it shows that the white wire from the power cord should be connected to the 'L' (line) terminal on the unit chassis; the black line from the power cord should be connected to the 'N' (neutral) terminal on the unit chassis; and the green wire from the power cord should be connected to the 'ground' symbol terminal on the unit chassis.

This seems odd, since the unit came hard wired that way, I assumed it was correct.

However, the power cord black wire is the house system 'hot' wire'; the white wire on the power cord is the system neutral; and the green wire of the power cord is the system ground.

Am I missing something here? Has the unit been wired incorrectly? Is the circuit diagram wrong? Surely, someone would have picked this up by now.

Why would Maytag design a circuit and reverse the wiring convention?

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On AC current it really makes no difference to the operation of the unit which terminal the wires are connected to as long as the circuit is completed. A reason for the inverted wiring is that there will be a resistance between the hot wire and the control circuit. It makes for a reduced load on the contacts and switches minimizing arching.

Posted on Jun 08, 2008

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