Emerson Liebert MC Microchannel Outdoor Condenser 28 - 220kW User Manual
System Maintenance
51
Liebert
®
MC
™
9.3
Fan Replacement
1. Turn off power to the unit using the disconnect. With a voltmeter verify that voltage is no longer
present at the unit. Wait a minimum of 10 minutes to allow the EC Fan capacitors to discharge
before proceeding.
2. Remove fan cover, disconnect electrical connections internal to EC fan and remove cable glands
3. Remove hardware that mounts EC fan to condenser body.
4. Reinstall electronic cover. Maximum torque for the fan cover screws is 2.3Nm (20 in-lb).
4. Reinstall electronic cover. Maximum torque for the fan cover screws is 2.3Nm (20 in-lb).
!
WARNING
Risk of electric shock. Can cause injury or death.
Disconnect all local and remote electric power supplies and wait 10 minutes before working
Disconnect all local and remote electric power supplies and wait 10 minutes before working
within condenser main electrical enclosure or fan electrical enclosure. Unit contains
potentially lethal electrical voltage. Line side of factory disconnect remains energized when
disconnect is Off. Use a voltmeter to make sure power is turned Off before checking any
electrical connections or functions.
Only properly trained and qualified personnel may perform repair, maintenance, and
Only properly trained and qualified personnel may perform repair, maintenance, and
cleaning operation.
!
WARNING
Risk of high-speed, rotating fan blades. Can cause injury or death.
Fan blades can start rotating without warning at any time during a cooling cycle or after
Fan blades can start rotating without warning at any time during a cooling cycle or after
power is restored after a power failure. Disconnect all electrical power supplies to the unit,
verify with a voltmeter that the power is Off and verify that all fan blades have stopped
rotating before working on or near the fans.
!
CAUTION
Risk of contact with hot surface. Can cause injury.
Use proper skin protection when touching the electronics housing or allow time for the
Use proper skin protection when touching the electronics housing or allow time for the
housing to cool before replacing parts. The electronics housing can get hot and can cause
severe burns.
!
CAUTION
Risk of improper moving, lifting and handling. Can cause equipment damage or injury.
Only properly trained and qualified personnel should work on this equipment. Fan modules
Only properly trained and qualified personnel should work on this equipment. Fan modules
for MCL models weigh in excess of 92lb. (40.8kg) each and fan modules for MCS and MCM
models weigh in excess of 40lb. (18.1kg.) each. Use OSHA-approved lifting techniques, proper
body mechanics and extreme caution to avoid injury and dropping of fans during removal and
installation.
NOTE
If at any time a parameter is entered and the display does not show 888 or it displays Err, try
If at any time a parameter is entered and the display does not show 888 or it displays Err, try
to re-enter the parameter. If the display still shows Err after ENT is pressed, power cycle the
control board by unplugging P24, waiting 15 seconds and plugging P24 back in. Contact the
factory if the parameter still displays Err after ENT is pressed.
NOTE
If replacing a Ziehl-Abegg fan with an EBM fan, the existing ferrule must be removed from the
If replacing a Ziehl-Abegg fan with an EBM fan, the existing ferrule must be removed from the
end of the wires on the communication cable for all fans except the last fan. Twist wires
together before inserting into the terminal block.
Example:
Twist RSA labeled conductor of the input cable to RSA labeled conductor of the output cable.
Example:
Twist RSA labeled conductor of the input cable to RSA labeled conductor of the output cable.
Insert the wires into the properly marked terminal on the fan, two wires per RSA, RSB, and
GND terminal as shown in detail “A” on EBM MCS/MCM series drawing.