How To Commission The Pump Vfd - York YLAA Series Installation Operation & Maintenance

SECTION 6 – COMMISSIONING

HOW TO COMMISSION THE PUMP VFD

1. Put pump in HAND mode.
2. Change parameter 0-20 (default value is option
1601 – "Reference [Unit]") to option 1850 "Sen-
sorless Readout" to display Sensorless flow read-
out on top left corner of screen.
3. Change parameter 0-22 (default value is option
1610 – "Power [kW]") to option 1654 "Feedback
1 [unit]" to display Sensorless pressure readout on
top right corner of screen.
4. Check with customer regarding new actual flow
and head and verify what flow is required. Ramp
the pump up or down to achieve requested flow.
Record the VFD sensorless flow and pressure –
this will be your new setpoint.
5. Set parameter 20-21 to the Sensorless Pressure
readout taken in the previous step.
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6. Set parameter 22-89 to the Sensorless Flow read-
out taken in the previous step.
7. Set parameter 22-87 to a value that is X% of the
value in 20-21. This percentage needs to be calcu-
lated based on the design flow and the published
minimum flow for the unit. This ensures that the
drive will not allow the pump to operate below the
minimum flow of the chiller. You have now read-
justed the quadratic control curve to match actual
site conditions.
8. Change parameter 0-20 back to default value of
option 1601 – "Reference [Unit]".
9. Change parameter 0-22 back to default value of
option 1610 – "Power [kW]".
10. Put the VFD back into AUTO mode.
FORM 150.72-ICOM6
ISSUE DATE: 12/29/2017
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JOHNSON CONTROLS