Column-by-Column: an AIM Manual Series

The AIM Manual holds a wealth of knowledge for contractors and installers, but there are two pages that stand out, pages 13 and 14. These pages are packed with information imperative to single-phase motor installation and operation. This Franklin AID introduces a series where we will review pages 13 and 14 column-by-column, maximizing your knowledge and understanding of single-phase motor specifications.

If you are dealing with 50 Hz motors, you will need a 50 Hz AIM Manual. Also, for those dealing with a 3-phase motor, please reference the table on page 22 of the AIM Manual. This series will focus on single-phase motors and will either be 115 or 230 volts.

Beginning on page 13, column one has the heading “Type” and lists the five types of single-phase submersible motors, manufactured by Franklin Electric, starting with 4-inch, 2-wire. The “4-inch” is slightly redundant here, as 2-wire motors are only available in 4-inch. These motors are manufactured in ratings from ½ to 1.5 hp, with the ½ hp being unique in that it comes in 115 and 230 volts. It is important to keep in mind that 2-wire motors have no control box or any type of capacitor associated with them.

Directly below are the 4-inch, 3-wire motors. Of course, all 3-wire motors have a control box associated with them. You can think of the motor and control box as a matched set. The motors listed here are nearly identical to the 2-wire motors above. This becomes obvious when looking at the data to the right (more on these columns in later posts). In every case here, the QD control box only contains a start capacitor.

Moving down, the next row lists 4-inch, 3-wire with CRC CB. It is here that things may get confusing. First, the letters CRC CB stand for Capacitor Run Control Control Box. In this case, the 3-wire motors here are the same as above; however, on the 230 V models you can replace the standard QD control box with a QD control box that has both a start and run capacitor. Making this switch changes the performance slightly, and creates the need for another category in the column. We’ll address the advantages of this switch in a later post, but keep in mind, all we have done here is change the control box, not the motor.

The next set of rows are the 4-inch, 3-wire motors ranging from 1 to 5 hp. Each of these five motors always use a control box that contains both a start and run capacitor

Finally, in the last row of the column are the four 6-inch motors. All of the motors in these rows are 230 V and get paired with Franklin control boxes that contain one or more start and run capacitors.

Breaking down this column alone helps us answer questions like, “What’s the largest single-phase motor Franklin makes?” or “Does Franklin offer a 115 V motor in anything larger than ½ hp?” and “What’s the largest 2-wire motor Franklin offers?”

As one of the most important tools in the field, it’s important to know the ins and outs of the AIM Manual. Stay tuned for the next post when we explore the columns labeled Motor Model Prefix and Rating where we will delve into exactly what those numbers mean.