adjustable pulley

Since I do not own a clamp on Amp meter, is there another method to adjusting the pulley for the motor so as not to overload the motor? I have a 1/2 HP, 2 speed 115vac motor at 7.4 amps/4 amps. Emerson is the brand name. My old motor was by A.O. Smith. Specifications were the same.

 

If the cooler is running through ductwork, it will have more resistance and you will want to adjust the pulley in so that it is bigger. (runs the blower faster)
If the cooler just dumps down into the hall, adjust the pulley so that it is smaller. (runs the blower slower)
If you still have the old pulley, try to get the new one as near adjusted as possible to match the old one. If you are running a 1/2 horse motor, you probably have a 4500 cfm cooler. That motor should use a 3 1/4 to 3 1/2 inch pulley.

 

Thanks Sammy37 for your response. Everything you stated is correct except that I am using the original pulley I took off of the defective motor. After searching feverishly on the Internet, I found instructions on how to adjust the pulley and it matches what you said in your response. I will go ahead and follow through on that. I am also going to increase the water distribution to my cooling pads by at least 50% with my own design water distribution system using two pumps to each feed 2 pads. I want to make sure the pads stay wet at all times. Thanks again Sammy37 for responding.

 

You are very welcome.
Let me throw in my two cents on the pump idea. Adding more water than the pads need will actually make the cooler blow a couple of degrees warmer! I have tested this.
No small residential cooler ever needs more than one pump. As long as the pads are damp, that will give you your best air output temp.
And one more thing, make sure you are using the wood aspen pads, they will give you the best cooling results, especially if you double them on each side.