Start-Up Procedure; Mechanical Component System Verification; Electrical Components System Verification; System Start-Up Preparation For Vgn - Greenheck Vektor Series Installation, Operation And Maintenance Manual

Start-Up Procedure

Prior to starting and testing the VGN, it is suggested
that the following check list be complete. If the fan
system is not operating properly, the nozzle will not
function as designed. During the testing of the VGN it
will require the fan to operate within its designed CFM
range; if the CFM is too low the nozzle will not actuate.
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 have
loosened during shipping.
All control enclosures and devices mounted in the
appropriate locations.
Verify fan wheel alignment.
Complete motor pulley adjustments as required.
All duct connections complete and sealed.
All fume hoods installed and operational.
All duct VAV control devices installed and
operational.
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.
Verify fan wheel rotates the proper direction when
electrical power is applied.
Verify that the isolation damper opens when the fan
is turned on.
Verify that the by-pass damper operates properly to
safeguard against pressurization damages within the
system.
Service feeder(s) to all controls completed and
tested.
Control wiring to all devices completed and tested.
All field electrical connections complete and tested.
Communication wiring to Building Management
System completed and tested.
12 VGN Technology

System Start-Up Preparation for VGN

• It is suggested that the Mechanical Component
System Verification and the Electrical Component
System Verification check list be complete prior to
VGN start-up.
• It is very helpful to have the test and balance
contractor, electrical contractor, and BMS/VFD
programmer/operators on-site during VGN startup.
• During the startup procedure the fan speed will be
increased, decreased, and there will be periods of
time when the entire fan system will be shut down;
prior arrangements must be made with the lab to
accommodate these times of shut down. Opening
and closing of fume hoods and dampers will be
required during this start-up.
• It is useful to have multi-meter ready for diagnostics.

System Start-Up for VGN

1. Apply input electrical power to the VGN controller to
turn it on.
2. Open the VGN control box and confirm that the
Carel controller is powered on. The Carel controller
is pre-programmed specific to each job site and
fan. Test and balance adjustments are the only
adjustments that may be required; refer to test and
balance section of this manual for details.
3. Open the pressure transducer box mounted on the
fan body to confirm that the pressure transducer
display is powered on. The numbers on the display
may be changing even with the fan off; this is
normal operation. The pressure transducer is very
sensitive; do not attempt to adjust or zero the
pressure transducer as this will void warranty.
4. Adjust the fume hoods and dampers in the building
such that the fan system can flow 100% of its
designed CFM and static pressure.
5. Confirm the bypass dampers are fully functional.
6. Turn fan 1 on to 100% of its designed flow and
static pressure with the VFD.
7. Confirm the nozzle blades on fan 1 move when
the fan is powered up. When a fan is turned on the
VGN controller will open the nozzle to 100% for 60
seconds to allow the fan to ramp up to full operating
speed quickly. After the 60 second time period
elapses the nozzle will adjust to the proper opening
size to maintain required nozzle velocity. The nozzle
blades movement can be viewed from the ground
by looking at the outside edges of the nozzle.
8. Confirm that the Carel displays that "FAN1" run
status is "ON". The Carel unit should also be
displaying the "FLOW" and "NOZ" % which is
nozzle opening percentage. If the Carel is not
showing a "FAN1" run status as "ON" none of the
above data will be displayed; to diagnose that issue
first confirm that the fan 1 is truly running. If fan 1 is
running then check that the "1FNRUN" terminal has
a 24 VAC signal to it from the BMS or VFD.
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