Greenheck Vektor Laboratory Exhaust with VGN Technology Electrical Controls Information (476072) - Manual (Page 24)

The following start-up procedure is to be completed
in order to verify that the fan is in working order.
It does not cover the details for test and balance,
VFD programming, commissioning, or system
troubleshooting which is covered in other parts of the
Installation, Operation and Maintenance Manual.
Mechanical Component System Verification
For detailed descriptions to complete these operations,
see equipment Installation, Operation and Maintenance
Manual (IOM).
Fan assembly and installation completed.
Check all fasteners for tightness, as they may loosen
up during shipping.
All pressure tubing lines installed as required.
All control enclosures and devices mounted in the
appropriate locations.
Verify fan wheel alignment.
Electrical Control Components System
Verification
For detailed descriptions to complete these operations,
see equipment Installation, Operation and Maintenance
Manual, National Electrical Code and local electrical
code.
Service feeder(s) to all controls completed.
Control wiring to all devices completed.
All field electrical connections tested and torqued.
Communication wiring to Building Management
System completed.
Electrical System Start-Up for Nozzle
Controller
Use appropriate electrical safety gear as required.
System VFD (customer-supplied)
Make sure disconnect switch at the VFD is in the
‘OFF’ position.
Verify each power phase at the VFD disconnect is
not shorted to ground using a voltmeter.
Turn on the breaker that feeds the fan VFD.
Verify the voltage is correct from phase to phase
using a voltmeter at the VFD disconnect.
Apply power to the VFD by turning on the disconnect
switch that is interlocked to the door.
Verify that the VFD is in the ‘OFF’ mode at the VFD
keypad.
Turn on the service disconnect switch at the fan.
Start-Up Procedure - Electrical Controls
Nozzle Controller (factory-supplied)
Make sure feeder breaker for the nozzle controller is
in the “OFF” position.
Verify power wiring to the high voltage 120V
terminals (L1, N) is correct and is not shorted to
ground using a voltmeter.
Turn on the breaker that feeds the nozzle controller
panel.
Check control voltage to verify it is correct using a
voltmeter. Should be 24 volt control.
Verify and adjust the system controller settings in the
“System Settings” menu as required.
System Start-Up
Open all lab hoods inside the building and verify duct
control is operational.
Increase fan speed if required using the VFD keypad
up and down arrows.
Press the ‘HAND’ button at the VFD keypad.
The isolation damper will start to open.
The fan speed will start to accelerate to the set
value.
As the fan speed increases the nozzle will open to
maintain constant velocity.
Verify fan wheel rotation. Verify it matches labeled
direction and IOM.
If the fan wheel is rotating in the wrong direction, turn
off fan, disconnect power, and lockout main feeder.
Reverse two of the motor wiring leads to change
wheel direction.
Reapply power and press ‘HAND’ mode once again
at the VFD keypad.
Verify fan wheel rotation, verify it matches labeled
direction and fan Installation, Operation and
Maintenance Manual.
Use the up and down arrows at VFD keypad, change
the speed to verify nozzle reaction.
- As speed increases the nozzle will open.
- As speed decreases the nozzle will close.
Electrical Controls Information for Customer-Supplied Variable Frequency Drive
24 VGN Technology
®