A PPENDIX D: W IRING D IAGRAMS (D ECEMBER
2019+)
Notes concerning the wiring diagram:
Power is brought into the electrical box as 460 / 230 / 208 Volt AC three phase or 230 / 208
Volt AC single phase. Power is then branched to the transformer via a single phase. This
transformer converts the 460 / 230 / 208 Volt AC single phase to 120 Volt AC single phase.
This is then branched to 24V DC for the controller, LED lights, and air sensors.
Breakers are marked on the electrical diagram. There are:
(1) on the transformer secondary coil
(2) on the transformer primary coils.
(1) on the terminal strip for the differential pressure sensor
(1) on the terminal strip for the lighting circuit
The overload may need to be reset. The Eaton overloads have an automatic reset function,
which is turned off. If this has not been set, the overload will require being reset via the red
button marked 'Reset'.
A unit can be wired for both High Voltage (460 VAC 3 Phase) and Low Voltage (230 / 208
VAC 3 Phase). The jumper(s) on the input 'H' side of the transformer change depending on
the input voltage. For changing the wiring of the unit, refer to the wiring diagram for jumper
settings and motor wiring.
NOTE:
If the unit is being changed from High to Low Voltage (or vice versa), the
contactor and overload may need to be changed. This is because the lower
voltage requires twice the amperage. If the unit is being converted to low
voltage, the power wiring should be checked for proper gage wires. The
wiring in the motor connection must be changed as well.
Wire numbers have been added to the wiring diagram to aid in both the diagnostic issues as
well as the maintenance and service issues while in the field.
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