Electronically
Commutated Motors
IM-4055
January 2022
Installation, Operation & Maintenance Manual
Electronic commutation (EC) is the latest motor technology to be
used in direct drive fans. Also known in the industry as Brush Free
or Brushless DC, the EC motors utilize an electronic circuit board to
control the functionality of the motor. The motor operates off of
115V or 208/230V AC single phase power or 208/230V or 460 three
phase power, which is converted to DC power within the motor’s
circuitry. The result is a highly efficient motor with an expanded
speed control range and a variety of speed control options from
which to choose.
This manual has been prepared to guide the users of electronically commutated motors in the proper installation, operation
and maintenance procedures to ensure maximum equipment life with trouble-free operation.
For safe installation, startup
and operational life of this equipment, it is important that all involved with the equipment be well versed in proper fan safety
practices and read this manual. It is the user’s responsibility to make sure that all requirements of good safety practices and any
applicable safety codes are strictly adhered to.
Because of the wide variety of equipment covered in this manual, the instructions
given here are general in nature. Additional product and engineering information is available at www.tcf.com.
REVIEW AMCA BULLETIN 410 PRIOR TO INSTALLATION
Table of Contents
Safety & Hazard Warnings ...........................................................................................................................................................................2
Shipping & Receiving ....................................................................................................................................................................................2
Handling ....................................................................................................................................................................................................... 3
Unit Storage ................................................................................................................................................................................................. 4
General Installation ...................................................................................................................................................................................... 4
Electrical Connection ................................................................................................................................................................................... 5
Speed Control Options: ODP & TENV Motors .......................................................................................................................................
5-10
Speed Control Options: TEFC Motors ...................................................................................................................................................
11-12
Speed Control Options: OP Motors ...........................................................................................................................................................1 3
Maintenance ...............................................................................................................................................................................................1 4
Troubleshooting ..........................................................................................................................................................................................1 4
Fan Maintenance Log .................................................................................................................................................................................1 5
Refer to the safety section(s) in this manual prior to installing or servicing the fan. The most current version of this installation and
maintenance manual can be found on our website at www.tcf.com/resources/im-manuals.
SAFETY NOTICE
Model DCRD
with EC motor
Twin City Fan
