10.2 Blower Drive System—EC Fans
WARNING! Risk of electric shock. Can cause serious injury or death. Open all local and remote
electric power supply disconnect switches and verify with a voltmeter that power is off before
working within the fan-motor electric-connection enclosures. Fan-motor controls can maintain
an electric charge for 10 minutes after power is disconnected. Wait 10 minutes after power is
verified as off before working within the electric control/connection enclosures. Use only fully-
trained and qualified HVAC technicians to perform maintenance on the fans.
CAUTION: Risk of contact with hot surfaces. Can cause injury. The electronics housing,
humidifier components, fan motor, and some electrical components are extremely hot during
unit operation. Allow sufficient time for them to cool to a touch-safe temperature before
working within the unit cabinet. Use extreme caution and wear appropriate, OSHA-approved
PPE when working on or near hot components.
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.
Evaporator fan modules weigh in excess of 125-lb (56.7-kg). Use proper lifting techniques and
wear appropriate, OSHA-approved PPE to avoid injury and dropping the fan module during
removal. Equipment used in handling/lifting, and/or installing the fan assembly must meet
OSHA requirements. Use handling/lifting equipment rated for the weight of the fan assembly.
Use ladders rated for the weight of the fan assembly and technicians if used during installation.
Refer to handling/lifting, and/or installation equipment operating manual for manufacturer's
safety requirements and operating procedures.
NOTICE
Risk of improper power-supply connection. Cancause equipment damage and loss of warranty coverage.
Prior to connecting any equipment to a mainor alternate power source (for example: back-up generator
systems) for start-up, commissioning, testing, or normal operation, ensure that these sources are correctly
adjusted to the nameplate voltage and frequency of all equipment to be connected. Ingeneral, power-source
voltages should be stabilized and regulated to within±10%of the load nameplate nominal voltage. Also, ensure
that nothree-phase sources are single-phased at any time.
NOTICE
Risk of improper installation. Cancause equipment damage.
Only a properly trained and qualified technicianshould install or openthis motor.
Use 60/75°C Class 1 copper wire only.
10 Maintenance
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