8 VFD66 User Guide
www.johnsoncontrols.com Issue Number: 2
Risk of thermal damage
The VFD66 control can generate and dissipate significant heat. Mount the control on a
metal, concrete, or cinderblock mounting surface. Mounting the VFD66 control on
surfaces made of wood or other heat-sensitive material may result in damage to the
mounting surface.
Risk of equipment damage
Motors used with the VFD66 controls must meet certain specifications for proper
performance and operation. Motors that do not meet these specifications may be
damaged.
Risk of electrical shock
The printed wiring board and its components are at AC line voltage. Direct or indirect
contact with line voltage can result in personal injury or death.
Risk of electrical shock
The VFD66 drive remains electrically charged for a period of time after the power is
removed. To avoid possible electrical shock, wait at least 10 minutes after AC supply
power has been disconnected from the VFD66 drive before servicing the control. Failure
to wait until the VFD66 drive fully discharges could cause electrical shock, personal
injury, or death.
Risk of equipment damage
Connect each of these items to the VFD66 drive using a separate conduit for each set
of wires:
• Line voltage supply power
• Line voltage output power to motor
• Low voltage signals from input devices
Running different voltage and frequency wires in the same conduit can create electronic
noise or harmonics, which may damage the condenser fan motors.
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