[alisonarod]

Hello,

I have a Maytag Skybox Vending Machine. The model number is MBV1976AAB. Recently, the skybox has become warm inside and there appears to be a humming or a buzzing noise coming from the compressor. The compressor is also hot to touch. I figured that I needed to replace the starting components, so I ended up changing the start relay, the overload protector as well as the capacitor. The start relay connects directly to the compressor via the right and left lower terminals (start and run). The overload protector connects to the upper terminal on the compressor (com). I then connected the two wires from the start capacitor into the start relay as diagrammed from the previous relay and capacitor. Finally, I connected one refrigerator wire directly to the overload device and the other refrigerator wire to the start relay.
I turned on the refrigerator and still noted a hum or buzzing noise coming from the compressor with no cool air entering the refrigerator after keeping it on for sever hours. Keep in mind, the lights, the fan, the beverage dispenser and everything else appears to be operating properly.

My questions:

Am I supposed to attach a wire from the start relay directly to the overload protector? If so, I have not done that yet.

And, lastly, which terminals on the start relay and overload protector does such a wire attach to?

Please help! I would appreciate it. Thank you.

[richappy]

If you used the original factory start device and the compressor will still draw a lot of current, you have a bad start winding in the motor, or a seized compressor. The capacitor is a run capacitor that has little effect on starting torq.

[richappy]

Your refrigerator supplies two wires to the compressor, one to the overload protector and the other one to the start device.

[alisonarod]

Thanks richy. I realize that. However, doesn't there need to be a wire that attaches from the start relay directly to the overload protector? That is where my problem lies. I do not know which terminal on the start relay and which terminal on the overload protector to attach such a wire

[richappy]

If the common pin is on top, the start pin is on the right side. The start device sends a short period of start current to start the compressor. In your case, it seems your start winding is blown open. You will need a meter to verify, otherwise, it is hard to help without meter data.

[alisonarod]

Richappy. There is continuity between the com and the start pin on the compressor using a meter. The overload protector is attached to the com winding while the start relay is connected to start and run. All my wires are connect properly seemingly. But again, doesn't there need to be a wire that connects from one terminal on the start relay to one terminal on the overload protector? If yes, which terminals does such a wire connect to?

[richappy]

No other wires are needed. Voltage from the fridg goes to the overload klixon and the start device.

[alisonarod]

Thanks. I was told by someone who has a similar set up that a wire needed to go from the start relay to the overload device so that if too much current enters the comp, the start relay will communicate with the overload to click on.

[richappy]

That IS the worst total nonsense I ever heard! The compressor gets 115 volts and the overload klixon and start device act together to properly protect the compressor from internal or external overloads and get it started and running efficiently with sufficient running torque. Any wiring modification is detrimental to the compressor period!!!