Question about AO Smith 2 Hp Spl 3450rpm M56 Frame 115/230 Volts Replacement Air Compressor Motor Electric Motor No.B381

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Compressor bad I have a 51/2 year old frigidaire refrigerator that the compressor has gone bad in. One month ago replaced relay overload start capacitor (3 in 1) when it stopped cooling. Now the compressor has grounded out.(checked with ohm meter) Any advice if I should replace compressor or buy new refrigerator. Will putting the 3in1 on the unit for this past month mess up anything else in the refrigerator? Thank you for any advice, I am very upset and confused on what to do.

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I would think that compressor would cost a lot of money.So if I were you I would buy a new refrigerator .

Posted on Feb 12, 2009

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I have an old air compressor that I have replaced the motor magstart and pressure switch on the motor is a 220 / 240 volt 5 horsepower motor it also has a low pressure oil cutoff switch does anybody have a...


Control: L1-SS-P-O-OL-OL-M-L2 In series, L1 is line 1, SS is start/stop switch, P is pressure switch, O is oil switch, OL is overload contact, M is magnetic coil (solenoid), L2 is line 2.
The voltage of M must be rated for the control voltage, across the line voltage (240V) or of a control transformer voltage, e.g. 240v/24v. A control voltage would be wired across the line, to L1 and L2.
Power: L1-T1-OL-M1, L2-T2-OL-M2. Line one to Line 1 on contactor, T1 on contactor jumpered to OL (overload heater) and out the overload heater terminal M1 to the motor terminal 1. Same for line 2, Line 2 to L2 on contactor, T2 on contactor jumpered to OL (overload heater) and out the heater overload terminal to M2 motor terminal.
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I, years ago had a similar situation, and it turned out that my compressor was one which REQUIRED LUBRICATING OIL IN THE CRANKCASE [just like a 4-cycle lawnmower engine].

I had failed to regularly check the oil level and over 4 or 5 years it had "used up" the oil and was beginning to run dry. Dry bearings build additional friction which will cause "drag" and slow the compressor RPM!!!!! That could explain the inability of your compressor to exceed 20 to 30 Psi!

With enough dry running, the bearings within the compressor will eventually totally wear out, and FREEZE-UP, locking the compressor up. Once that happens, the compressor will have to be replaced, OR OVERHAULED, just like you would do with a frozen bearing in a lawnmower engine!!!!!

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