Johnson Controls VFD66 Series Product/Technical Bulletin page 4

Product Code
Number (Cont.)
A350PS-1C Proportional Plus Integral
Temperature Control
P352PN-3C
Proportional Plus Integral
Pressure Control
VFD66-CVR-1C External Potentiometer
Replacement Cover
Mounting
!
CAUTION: 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.
Follow the guidelines below when mounting a
VFD66 control:
•
Mount the VFD66 control on a vertical surface with
the heat sink fins oriented vertically and the
conduit holes facing down.
•
Provide a minimum of 4 in. (102 mm) clearance
around the heat sink.
•
Ensure that output power wiring between the
VFD66 control and the motor does not exceed
50 ft (15 m).
•
Mount NEMA 1 models indoors, in a location
protected from explosive vapors, corrosive gas,
water, and dust.
•
Mount NEMA 4 models indoors or outdoors in a
location protected from explosive vapors,
corrosive gas, and dust, and out of direct sunlight.
Ambient air temperature and installation altitude affect
the maximum output rating of the VFD66 controls (see
De-Rating the VFD66 Control for High Temperatures
and High Altitudes).
Wiring
!
WARNING: 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.
4 VFD66 Series Condenser Fan Speed Controls Product/Technical Bulletin
Description
Refer to System 350 A350P Electronic Proportional Plus Integral
Temperature Control Product/Technical Bulletin (LIT-930020) for
more information.
Refer to System 350 P352PN Electronic Proportional Plus
Integral Pressure Controls for PSI Applications Product/Technical
Bulletin (LIT-930044) for more information.
Refer to Installing the External Potentiometer Replacement Cover
Application Note (LIT-121419) for more information.
Information
!
WARNING: Risk of Electrical Shock.
The VFD66 controls remain electrically charged for a
period of time after power is removed. To avoid
possible electrical shock, wait at least 5 minutes
after AC supply power has been disconnected from
the VFD66 controls before servicing the control.
Failure to wait until the VFD66 control fully
discharges could cause electrical shock,
personal injury, or death.
!
CAUTION: Risk of Equipment Damage.
Connect each of these items to the VFD66 controls,
using a separate conduit for each set of wires:
•
Line Voltage Supply Power
•
Line Voltage Output Power to Fan 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.
Read this entire section, including the information on
emissions compliance, before wiring the
VFD66 control. See Figure 5 for a view of the circuit
board components and the conduit entry bracket.
Accessing the Interior
Remove the terminal access cover (see Figure 2,
Figure 3, and Figure 4) to access terminal blocks,
jumper blocks, and internal potentiometers (see
Figure 5).