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Registered
Join Date: Oct 2003
Location: Mount Pleasant, South Carolina
Posts: 15,066
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Another HVAC condenser question
From my other thread, I replaced the capacitor and then the fan motor on my condenser. I turned on the AC at the thermostat and saw that the fan was blowing. Then I turned it off, as I haven’t needed it.
Tonight, I started thinking about it, and wasn’t sure if the fan was blowing the air up or out the sides. I did a check and it’s blowing out the sides. So, that’s not good. Can I swap a couple of wires from the fan, to make it blow up? I’ve seen online where a couple of motor fans have wires that you can reverse, but my motor does not have that ![]()
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Registered
Join Date: Mar 2004
Location: La Crosse, WI
Posts: 1,475
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AI Overview
To change the direction of a single-phase AC motor, you must reverse the polarity of the start winding relative to the run winding. This is achieved by swapping the two leads of the starter winding at the terminal block, typically labeled Z1 / Z2 or by rearranging capacitor/motor lead wires. Key Methods to Reverse Direction Swap Start Winding Leads: Identify the start winding wires (often smaller gauge) and reverse their positions on the terminal block. Capacitor Reconnection: For capacitor-start motors, move the power supply wire from one side of the capacitor to the other terminal. Terminal Block Jumpers: Many motors have a terminal block with brass jumpers. Changing these jumpers from horizontal to vertical often reverses the polarity. 4-Wire Swap: If the motor has four lead wires (two for the main winding, two for the start), swapping the connections of the start winding wires will reverse the rotation. This video demonstrates how to reverse the direction of a single-phase motor by swapping the start winding leads: Important Considerations Safety First: Disconnect all power before touching any wires. Identify Winding Type: Ensure you are swapping the start winding, not the main winding, to avoid motor damage. Non-Reversible Motors: Some motors, particularly in fans or appliances, have an internal common connection that makes them non-reversible without disassembling the motor. Switching: For frequent reversal, a DPDT (Double Pole Double Throw) switch can be wired to handle this. Fan Motors: For fan motors, sometimes the entire motor housing must be flipped 180 degrees. Disclaimer: Electrical work carries risk of shock or fire. Ensure all work complies with local electrical codes. I may be a bot. I might have just googled this and pasted it here. |
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Registered
Join Date: Oct 2003
Location: Mount Pleasant, South Carolina
Posts: 15,066
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Tldr 🤯🤯🤯
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UnRegistered User
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Some motors are easily reversable. I remember some having a rubber connector that could simply be unplugged and turned to reverse the motor. Some also had multiple lead colours that could be swapped.
The data plate should tell you if those options exist or if the motor was CCW or CW from the shaft end.
__________________
Bill K. "I started out with nothin and I still got most of it left...." 83 911 SC Guards Red (now gone) And I sold a bunch of parts I hadn't installed yet. |
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Registered
Join Date: Oct 2003
Location: Mount Pleasant, South Carolina
Posts: 15,066
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I swapped the orange and brown wires on the capacitor and now it’s blowing out the top.
The brown wire is on common and the orange wire is on the fan terminals. When I get home, I’ll let it run and see how it does.
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