Problem: Will a larger blower motor help my air conditioning? Can I adjust the speed on my blower motor to blow more air? My air conditioner does not seem to be blowing air very hard.
Answer: I would like to recommend that you check your furnace’s blower motor capacitor to make sure the capacitor is not weak. A weak motor capacitor can cause the blower to run slow. Please click here if you would like to see the capacitors that we sell. Some small appliance shops will test capacitors free of charge. Yes, you can change your blower motor’s speed to try and improve your airflow if your blower motor is not already at the highest speed. On most blower motors the black wire is the high-speed wire. Below we have a really good YouTube video made by AC Service Tech LLC about changing blower motor speeds. Thanks to AC Service Tech for making this great video! I would also recommend that you check to make sure your blower wheel (squirrel cage) and the bottom of your air conditioner evaporator coil is clean before trying a larger motor. I would recommend checking your refrigerant charge to make sure your AC is charged up properly. If your AC system is low on charge it will cause the coil to freeze up and cause a restriction in the airflow. The rule of thumb is the blower should produce 440 CFM (cubic feet per minute) of air per ton. On a two-ton system that is 880 cfm (cubic feet per minute). This usually calculates out to about a 1/4 to 1/3 HP blower motor. If you get too much cfm it is hard on the air conditioner, because it robs the air conditioner of the cool gas going back to the compressor to keep it running cool and you have to over-charge the AC unit to get the cool gas going back to the compressor. I usually need to add refrigerant to a system that has too large of a blower motor. You want to charge your system so that there is cool gas going back to the compressor and the suction line feels like a cold coke can right out of the refrigerator. The air conditioner should make a 15 to 20-degree difference in the ambient air. If your home is 75 degrees inside, the air coming out of the registers should be between 55 to 60. I hope I have answered your question. I have installed oversized blower motors before to get more airflow. I would not recommend going over 1/3 horsepower in your case. You would need to check the charge after you install the new motor to make sure you are getting the needed cool gas back to the compressor. Below we have a real good YouTube video produced by hvacrepairguy which shows how to replace a blower motor. Thanks to hvacrepairguy for making this informative video! Please click here if you would like to see other DIY videos on how to test capacitors and clean AC evaporator coils. If you have any questions please email us anytime at firstname.lastname@example.org or comment in our comments section below. We would love to help you out and have your business!
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