Motors and blades same size? Voltage correct for motors?
I went and checked a 208/230V Master-Bilt 3 door freezer the other day, the compressor had locked up on it. I changed the compressor today, it was one of the cast iron coplematic compressors, the thing has two condensor fan motors on it. So I put the new compressor in, crank it back up, and the fan motor on the right turns about half speed, the one on the left turns at full speed. If I stop the one on the left, the one on the right will turn at full speed. Then if you let the one on the left start turning again, it will get up to full speed and the right side will start going at half speed again. I changed the motor, it still does it. I don't know what the hell to do I've never seen anything do like this. I have checked the wiring, all the fan motor wires are hooked up to the two 208V wires coming from the defrost clock. Could anyone help me?
Motors and blades same size? Voltage correct for motors?
No insult intended but how clean is the condensor coil? and check wiring to the motors, make sure your getting full voltage.
Only other thought is make sure there atleast 9 watters.
We the willing, led by the unknowing, for the ungratefull, have done so much for so long with so little, we are now qualified to do anything with nothing.
Refrigeration is all the same weather your making Ice, refrigerating or freezing the product.
I cleaned the coil right after I changed the compressor, the blades are the same size, they are 16w fan motors, same voltage on both of them. The only thing I haven't done is check the voltage right at the fan motors while it's on, I don't know why there would be a voltage drop between where they hook in on top of the compressor and where the wires go into the fan motor itself. I mean I have the fan motors hooked up on the wires coming in to power the compressor and I know it's 208v cause I checked it, and the compressor runs perfectly fine. It's really got me confused.
is there a baffle in the fan shroud between the two motors fan blades?
Try swapping the motor/fan assemblies from one side to the other to see if the problem follows the motor or if it stays in the same spot.
on some of them units one of the fans is cycled on and off on an ambient control so when you stop the first motor head press goes up and cycles second motor. the motor running half speed may be ghosting. is it gittin voltage?
You're kidding right? There is no fan cycling control on this unit, I've got enough sense to know that much. And no, the motor is not "ghosting", it keeps running by itself when you stop the motor on the left. And I was wondering if there was supposed to be a baffle in there or something too, but I'm pretty sure there isn't, to my knowledge me and my dad are the only people that have ever serviced this machine.
I bet if you put the old motor on the left and leave the new one on the right it's gonna be okey.Maybe a winding to winding short on the motor is drawing too much juice and starve the one on the right.
But before that I would check the voltage to the motors from the clock while the motors are running.Bad contact on the timer may not leave full voltage to the motors.
ok, this may be a dumb question but, is rotation on both correct? Just a thought.
Last edited by monkeyman#1; 04-15-2009 at 08:15 PM.
does the amps go up? I am thinking voltage drop.
You didn't mention measuring the voltage.
Ditto I would check for a voltage drop.
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I have had this same problem on a True 3 door freezer. The motor that was not changed out is the one with the problem. It has a shorted winding. Change it out and problem will go away. (took me four trips to figure it out)
Any run caps on motors?