Installation, Operation and Maintenance Manual
Field Installed Variable Frequency Drives (VFD’s
9
Subject to change without notice.
120.7-IM (1218)
Factory Provided VFD/Field Installed
1.
Turn off all power to the unit�
2.
Locate and remove the access panel for the
evaporator�
3.
Locate the evaporator blower motor�
4.
Locate the wiring to the motor and follow back to the
two (2) sets of power blocks (Refer to Figure 3A or 3B)�
NOTE:
Refer to Electrical Schematic provided with the unit
for specific power block ID.
5.
Remove the jumpers from between the power blocks�
Make note of the motor side power block to prevent
wiring the VFD backwards� (Refer to Figure 3)
WARNING
Severe damage and personal injury may
result if jumpers are not removed�
6.
Attach the appropriate size wire to the power block
(motor side) and connect them to the terminals on the
VFD marked for the motor (U, V & W)
(Refer to Figure 4)�
INFORMATION
Damage to VFD may occur if not correctly
wired�
7.
Attach the appropriate size wire to the line side power
block and connect them to the terminals on the VFD
marked for Line Voltage (L1, L2, & L3) (Refer to Figure
4A or 4B)�
8.
Secure all wiring per industry accepted practices�
9.
Replace access panel back on the evaporator section�
10.
Turn on power to the unit�
Figure 3A - Before VFD Installed Motor w/ Overload
Figure 3B - Before VFD Installed Motor w/o Overload
