Electrical Connections - Greenheck Vektor-H Installation, Operation And Maintenance Manual

Electrical Connections

Before electrical connections are made, the supply voltage, phase and ampere capacity must be checked
for compatibility with the fan motor. In addition, the supply wiring must be properly fused and conform to
local and national electrical codes. If the unit is supplied with a safety disconnect switch, ensure proper
wiring to the fan motor. Be sure the disconnect is switched to the "OFF" position before connecting
supply wires. If no disconnect is supplied, ensure the supply wire is not live before connection. Supply
wires are then connected to the optional safety disconnect switch (if supplied) or motor.
Motor - Disconnect Wiring / Isolation Damper Wiring Diagram
DISCONNECT
208 / 230 / 460 / 575 V 3 PHASE
FIELD WIRING
FACTORY WIRING
Applications with Variable Frequency Drive (VFD)
For Vektor systems with single-point, three-phase wiring per blower, the isolation damper actuator will
be powered via a step-down transformer, which is wired to the fan disconnect, as shown in the diagram
above.
If fan flow (motor speed) is to be controlled using a variable frequency drive with this wiring, the reduced
voltage and frequency supplied to the fan will cause control problems with the isolation damper actuator.
When a project's Vektor control sequence requires the use of a VFD, it is suggested that the control
contractor supply the isolation damper actuator voltage — independent of the power supplied to the
Vektor fan motor.
4
LINE IN
208 / 230 / 460 / 575 V 3 PHASE
MOTOR
208/230/460/575/60/3
DISCONNECT IS MOUNTED TO FAN HOUSING. TRANSFORMER IS MOUNTED
TO MIXING BOX (BYPASS AIR PLENUM) WITH DAMPER ACTUATOR MOTOR.
FOR SYSTEMS THAT SHIP UNASSEMBLED BECAUSE OF PHYSICAL SIZE,
THIS CONNECTION AT DISCONNECT FROM TRANSFORMER MUST BE FIELD
INSTALLED. WIRE WITH CONDUIT AND FITTING IS PROVIDED PRE-CONNECTED
TO TRANSFORMER.
208 / 230 / 460 / 575 V 1 PHASE
115V 1 PHASE
ISOLATION
DAMPER
ACTUATOR
MOTOR
POWER OPEN/SPRING CLOSE
OPTIONAL FACTORY
MOUNTED AND WIRED
ISOLATION DAMPER
ACTUATOR
TRANSFORMER
®