Pool Motor Cross Referencing

Cross Referencing Pump Motors

The nameplate of the motor being replaced contains much of the critical information needed to select a new motor. Some of the nameplate data detailed in the previous section is repeated below in order to reemphasize its importance when choosing a replacement motor.

Choosing the right replacement motor is easy using these 5 steps:

Know the end frame you need. Is it: Thru Bolt 5.146 Bolt Circle, Thru Bolt 5.812 Bolt Circle, C-Face Keyed Square, Flange 56C Frame, C-Face Threaded 56J Frame Square Flange
Know the total horsepower output: Find the horsepower and service factor on the nameplate of the motor to be replaced. Multiply the horsepower times (x) the service factor. The result is the “total horsepower” of the motor. Do the same for the possible replacement motors. Select the replacement motor that has a total horsepower (horsepower times the service factor) that is equal to or greater than that of the original motor’s total horsepower
Is the original motor single or three phase: The original and replacement motors must be the same unless the power supply is being changed.
What is the correct voltage:The operating voltage of the replacement motor must be capable of operating on the same voltage as the original motor. *TIP*: If the original motor was dual voltage (115/230 volt) and an equivalent dual voltage replacement is not readily available, a single voltage motor (115 bolt motor or a 230 volt motor) of the actual voltage being used at the installation may be used.
What is the motor’s cycle or hertz: As a general rule, 50-cycle motors should not be substituted for 60-cycle motors and vice versa.

Your distributor or dealer is also a great resource for determining what replacement motor you need. In addition motors can be cross-referenced on the A.O. Smith web site www.aosmithmotors.com.