Test And Balance For Vgn; Calibrating Carel Cfm Display With Test And Balance Procedure - Greenheck Vektor Series Installation, Operation And Maintenance Manual

Start-Up Procedure,
System Start-Up for VGN, continued
9. Reduce the fan speed to 50% of the designed CFM.
10. Confirm that the "FLOW" and "NOZ" numbers are
reduced from the 100% fan speed.
11. Confirm that the nozzle blades have closed slightly
from the 100% fan speed position.
NOTE: Repeat above steps for additional fans if
applicable.
12. If the VGN control system operates properly the
VGN system is ready for test and balance.

Test and Balance for VGN

Test and balance mode on the VGN controller allows the
user to lock the nozzle in one fixed position during a test
and balance of the fan system; it also allows the user to
adjust the K value for the CFM displayed on the Carel
to match the CFM of the fan while actively performing a
test and balance procedure. Please refer to the Test and
Balance section on page 16 for details on accessing the
test and balance mode on the Carel.
1. Verify that the "System Start-Up for VGN" has been
completed.
2. Adjust the fume hoods and or dampers to the
desired positions.
3. Turn on the desired fan.
4. Use the Carel controller Test and Balance mode to
lock the nozzle to 100% open; refer to the Test and
Balance section on page 15 for details on accessing
the test and balance mode on the Carel.
5. Perform desired test and balancing procedures.
6. Upon completing the test and balance of the fan
system, turn the Test and Balance mode off in the
Carel.
NOTE: Test and Balance mode will time out after
120 minutes.
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continued
Calibrating Carel CFM Display with Test and
Balance Procedure
The CFM displayed by the Carel unit can be offset to
match a desired test and balance procedure. It can be
offset to match a CFM output by a BMS or a real-time
pitot tube.
1. Verify that the "System Start-Up for VGN" has been
completed.
2. Adjust the fume hoods and or dampers to the
required positions to run the fan at 100% of
designed CFM. Do not allow any inlet conditions to
change during the remainder of this procedure.
3. Turn on the desired fan to 100% of designed
CFM. Only run one fan at a time during this entire
procedure.
4. Use the Carel controller Test and Balance mode to
lock the nozzle to 100% open. Refer to the Test and
Balance section on page 15 for details on accessing
the test and balance mode on the Carel.
5. Perform desired test and balance procedure.
6. Use Test and Balance mode K Value Adjustment on
the Carel to adjust the CFM displayed by the Carel to
match the desire test and balance procedure.
7. Upon completing this procedure turn the Test and
Balance mode off in the Carel.
NOTE: Test and Balance mode will time out after
120 minutes.
VGN Technology 13