HP Performance Optimized Datacenter 20c User Guide - North America

Environmental control system 52
To configure the fan current tolerance parameters:
1. Select Fan Current Tolerance.
A keypad appears.
2. Enter a fan current tolerance setpoint.
3. Select Save to store the new parameters in the system configuration file.
Fan current hysteresis
The fan current hysteresis parameters appear on the related buttons.
To configure the fan current hysteresis parameters:
1. Select Fan Current Hysteresis.
A keypad appears.
2. Enter a fan current hysteresis setpoint.
3. Select Save to store the new parameters in the system configuration file.
Fan current filter time constant
The fan current filter time constant appears on the related buttons.
To configure the fan current filter time constant parameter:
1. Select Fan Current Filter Time Constant.
A keypad appears.
2. Enter a fan current filter time constant setpoint.
3. Select Save to store the new parameters in the system configuration file.
Calibrating the flowmeter
This option enables flow rate calibration based on the value of a calibrated flow meter.
To calibrate the flowmeter:
1. Power down the HP POD 20c. For more information, see "Power down procedure (on page 72)."
2. Select Flowmeter Calibration Factor.
A keypad appears
3. Enter the calibration factor.
4. Select OK.
5. Select Save to store the new parameters in the system configuration file.
Calibrating the chilled water pressure sensors
This option is available only when the flow rate is zero and the chilled water pressure on the chilled water
supply and return lines is less than 12.75 psi. (1.5 bar).
To calibrate the chilled water pressure sensors:
1. Power down the POD. For more information, see "Power down procedure (on page 72)."
2. Vent the exterior chilled water vent valves to relieve pressure.
3. Verify that the ECS Overview screen (on page 43) indicates a flow rate of 0.0 lpm (0.0 gpm).
4. Select Calibrate Chilled Water Pressure Sensors.