Teco RA680 original fan motor should be 120V + 7" fan plate, I just like you thing to change a higher RPM fan motor for my Teco RA680 too. After that I bought a 180V fan motor and fit to my RA680, but original plastic fan housing bracket can't support the new 180V higher RPM fan motor vibration, so will made my chiller RA680 more noisy. I'm not sure why your chiller RA680 fan motor is 230V..... May be you modified before??? Before you buy the higher RPM fan motor, you need to make sure your fan housing can support your higher RPM fan motor or change the strong bracket for your RA680. You can visit the shop.... they have anything you want for your modify.