HP Performance Optimized Data Center (POD) 240a manual Adiabatic unit by unit blowdown

Page 77

Adiabatic unit by unit blowdown

Before you begin the process below, be sure to complete the steps in "Supply header gravity drain (on page 76)."

These steps allow low pressure air to force water from the AHU supply header through an additional drain that is located inside the access panel of each Adiabatic unit.

1.Remove the plug from the supply header debris Y-strainer.

2.Open the flushing ball valve by rotating the handle 90º until it is aligned parallel to the strainer and allow the Y-strainer to drain.

3.Connect the air hose from the site or from a portable compressor to the open Y-strainer connection using an air hose adapter.

4.Connect the air hose to the air source.

If you use a compressor, start the compressor and then open the air isolation valve from the chosen source.

CAUTION: Maximum allowable air pressure in the Adiabatic water supply header is 50 psi. Do not exceed this pressure at any time.

5.Move to the AHU service area of the POD.

6.Shut down power to the Adiabatic unit that is farthest from the air source by rotating its power switch to the Off position.

IMPORTANT: Only blow down one Adiabatic unit per aisle at a single time. Failure to do this will disrupt optimal air flow in the POD.

7.Open or remove the media access cover to the left of the Adiabatic unit control panel that was just turned off to show the inside of the unit.

8.Locate the spray nozzle header assembly drain line.

9.Attach the splash deflector finger-tight. Position the tubing so that blow down water is deflected into the drain pan, which minimizes splashing.

10.Carefully open the spray nozzle header drain valve. Be sure to apply air pressure to the spray header and observe that the splash deflector is in place.

11.Close the drain valve when either water stops flowing or air pressure is depleted.

12.Repeat steps to open and close the drain valve until no water exits through the drain valve.

13.Close the nozzle header drain valve.

14.Locate and close the external Adiabatic unit spray nozzle header isolation ball valve to isolate the unit from site water.

IMPORTANT: The external spray nozzle header may still be pressurized. This air pressure must be relieved.

15.Open the spray nozzle header drain valve to allow the header to de-pressurize.

16.Close the spray nozzle header drain valve.

17.Remove the splash deflector and replace or close the media access cover.

18.Repeat steps to open and close the drain nozzle to complete blowing down the Adiabatic units on this aisle.

Maintenance 77

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Contents Part Number November Edition AbstractPage Contents Air filter sensor HP POD 240e NA optional components Power feeder pull boxesBefore you contact HP HP contact information Regulatory compliance noticesComponent safety Operator safetyOverview Before you beginEnvironmental considerations Preventative maintenanceFire detection Structural component identification Component identificationComponent Description Parts and part number identificationExit sign locations Life safety component identificationComponent identification Component identification Main breaker locations Electrical power component identificationEnd view shown Component Description Reminds you that the electrical panels must only be Electrical power disconnect map label location End view shown Callout Electrical safety label DescriptionUPS Control cabinet component identificationIT section B control cabinet Component Description Security component identificationTop view shown Component Description RacksEPO system Life safety systemsLife safety overview ECS touchscreen and EPO indicators Component Indicator color Description Battery backup during an EPO eventEPO modes EPO accidental activationManual fire pulls Fire detection systemVesda air sampling smoke detection system Fire detection sequence of operations Fire alarm panelFire alarm indicators Emergency egress Power safety Power, electrical, and controlsSite electrical system Grounding and bondingLightning protection CapacitiesElectrical panel labels Power feedersPower distribution Adiabatic system Power distribution electrical busway systemPanel schedules Wire color codeEnd view shown Feature Specification Electrical busways Wire color DescriptionPage Drop boxes Rack powerLighting Feature SpecificationEnvironmental control system overview Using the ECSEnvironmental control system Satellite control boxes Facility connections to the ECSComponents of the ECS Connecting to the ECS through connection portals Connecting to the ECS through the demarcation boxManaging the ECS from the HP POD 240e NA Configuring the ECS Environmental control system Logging in remotely to the ECS Click Connect Locating the ECS IP addressNavigating the ECS interface Password protectedView Logging in to the ECS touchscreenTop screen Callout Icon name DescriptionCA RH Information displayed Description AD detail screenAisle in relation to the external ambient AD detail screen displays the following alarm conditions Charts screenAlarm displayed Description Operation displayed DescriptionPsychrometric chart Electrical Cabinets screen Alarms chartControls Network screen Alarms screen Stats screen Indicates the cold aisle combination temperature Control settings ConfigureHMI settings Setting the Min and Max range for alarms Setting the Min and Max temperature and RH setpointsManaging the ECS system US Customary o MetricForcing an alarm Setting the offset alarmSetting the IP address Maintaining the ECS parameters Temperature and pressure sensorsCallout Sensor Quantity per Description IT section Callout Sensor Quantity per Description Hot aisle Adiabatic unitsControlling the hot aisle fans Adiabatic components AHU systemOverview Adiabatic media AHU theory of operationAHU system AHU system Static pressure control Connection portals IT networking and communicationsNetworking Demarcation box Adding a phone Fire boxIT networking and communications Air filter sensor Standard componentsHP POD 240e NA optional components Power feeder pull boxesOptional components General specifications SpecificationsRack specifications Features SpecificationsEnvironmental specifications Preparing the Adiabatic units for winter Maintenance Periodic maintenance Component Description Supply header gravity drain Adiabatic unit by unit blowdown Supply header blowdown Standard power up procedure Power up procedurePower up checklist Standard power up procedureElectrical Cold weather power up procedureCold weather power up checklist Cold weather operation Full power down procedure Power down procedureHP contact information Contacting HPBefore you contact HP HP POD 240e NA regulatory compliance Safety and NEC complianceRegulatory compliance notices Warranty information Safety and regulatory complianceGlossary North American Outside air Power distribution unitProgrammable logic controller Performance-Optimized DatacenterEnclosure of sufficient size to enable entry of personnel Power usage efficiency Relative humidityUninterruptible power system Pounds per square inchDocumentation feedback Index Index Warranty Winterize, Hvac units 74 wire color code Safety, component Safety, power connections
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