Liebert® Air Economizer™ for Liebert DS™, Liebert CW™ & Liebert
Contents
1. 1 Locate the damper wiring inside the Liebert Air Economizer see Figure 5 The wires are coiled and attached to the Liebert Air Economizer frame 2 The wires have snap connectors that mate to wires secured to the cooling unit s frame Figure 5 Damper wiring connections Liebert DS and Liebert CW units adalh w Provide strain relief using apor otor cable tie anchors as shown Connection Confirm that the ties are tightened to secure the cable Top Motor Cable Ties Anchors Outdoor Air Damper Motor Connection Bottom Motor Route cable through the loose cable tie on the bottom plate of the s Liebert Air Economizer DPN001449 Tighten to provide strain relief 2 Pg 01 REV2 Location of motor and unit control DETAI L A board depends on unit model 10 Installation 2 3 2 Outdoor Air and Return Air Temperature and Humidity Sensor Connections The Liebert Air Economizer ships with sensors to determine the temperature and humidity of return air and outdoor air The sensors and wiring to connect them are in boxes inside the Liebert Air Economizer Outdoor air sensor Return air sensor Supply air limit thermistor factory connected to the main interface board These must be installed and connected to the primary cooling unit The outdoor air sensor and return air sensor connections for the Liebert DS and Liebert CW are shown in Figure 6 Connect the supply air limit t2. of its scale i e its maximum or minimum limits This is known as integral wind up On PI controls there are two error variables the proportional error pe the manipulated error me The controller output in PI control is the manipulated error The integral starts calculating manipulating as soon as there is a pe Permanent target for the integral is to increase decrease me so that after the selected integral time me is the double of the pe For example at a given pe of 10 and an integral time of 1 minute me will be 11 after 6 seconds 12 after 12 seconds 13 after 18 seconds finally reaching 20 double of pe after 1 minute 23 Operation 4 4 4 If pe doesn t change me will reach 30 after another minute This continues until me reaches 100 which is the maximum If pe changes me will also be changed with the same value For example pe is 20 me is 40 When pe changes to 15 me will change to 35 Controller Tuning If the controller is unstable or shows too many damper repositions see the Liebert iCOM s Wellness menu page 9 of 9 refer to Figure 15 the automatically adjusted controller values may not be best suited for this installation Tuning the controller settings could help achieve better results Controller tuning involves the selection of the best values of setpoint S102 proportional band S104 integration time S105 and if enabled the supply air limit setpoint S125 This is of
3. 1 Table 2 Table 3 FIGURES Liebert Air Economizer arrangement typical ene eens 2 Dimensions Liebert Air Economizer and Liebert CW models CW106D 114D 6 Dimensions Liebert Air Economizer and Liebert CW models CWO26D CW084D 7 Dimensions Liebert Air Economizer and Liebert DS downflow units 28 105kW 8 30 tons 8 Damper wiring connections Liebert DS and Liebert CW units nannaa cece eee ee 10 Temperature and humidity sensor connections Liebert DS and Liebert CW 11 Supply limit thermistor wiring and restricted airflow switch location 12 Operational ranges for chilled water systems and for compressor chilled water systems 15 Air flow pattern of a Liebert Air Economizer system een eee 16 Liebert DS setpoints screen page 40f Bb anna 18 Service Economizer page 1 of B eneee 19 Outdoor sensor data screen na 20 Damper settings and limits screen na 21 Deactivation Switeh a en ARENA See Daal ee a NA 22 Liebert COM Wellness menu page 9 ii 25 TABLES Dimensions Liebert Air Economizer and Liebert CW models CWO26D CWO084D 7 Liebert DS model dimensional data 28 105kW 8 30 tonS ana 8 Liebert Air Economizer troubleshooting na 27 Product Description 1 0 PRODUCT DESCRIPTION 1 1 General Product Information The Liebert Air Ec
4. 10 15 of the current value to allow faster reaction 11 Set Supply Limit Temp Value S125 back to the original setting NOTE Q The time to observe stable operation in the control settings above may be 30 minutes to an hour or longer The dampers rotate very slowly so noting repositions requires careful observations and timing If the Wellness menu shows the reposition rate to be less than 5 6 per hour tuning is satisfactory Monitoring the repositions during routine maintenance filters etc is recommended to determine if additional adjustments to reduce repositions are necessary The damper motor duty life will increase as the reposition rate is reduced 24 Operation Figure 15 Liebert iCOM Wellness menu page 9 WELLNESS economizer settings page 9 of 9 4 UNIT 01 SA PASSWORD Actual Level 3 372010 Number of Repositions SIA Run Hours SIA Repositions per Hour SIA E Reposition Counter Reset 4 for next previous unit e and gt to select parameter then gt to change parameter to confirm Refer to the Liebert COM user manual for additional information The manual SL 18835 is available at the Liebert Web site www liebert com 25 Maintenance 5 0 MAINTENANCE The Liebert Air Economizer requires little maintenance when proper installation startup and operation procedures are followed The following tasks should be performed at the intervals stated 1 Check outside air entry ducti
5. A flange is provided to attach the Liebert Air Economizer to the outdoor air duct Figures 2 3 and 4 Product Description Figure 1 Liebert Air Economizer arrangement typical Powered Outdoor Relief Opening by others gt gt Relief Air Return Air Sensors saat de Return Field installed Aj above damper r Room Relief Air Size collar according Discharge sized and Plenum to cooling unit opening provided by others Room Outdoor Air Sensor Field installed inside duct labeled Outdoor Sensor Filter by others Z Outside Air Entry Outside Opening with Louvers Screen and Bars to prevent precipitation vermin and human entry by others Outside Air Duct by others DPN001333 Rev 0 Liebert Unit Front ear TT Supply Air Limit Thermistor Field installed under floor 1 2 Equipment Inspection When the unit is delivered inspect all items for visible and concealed damage Report any damage to the carrier immediately and a file a damage claim Send a copy of the damage claim to Emerson Network Power or to your sales representative 1 3 Equipment Handling A WARNING Risk of top heavy unit falling over Improper handling can cause equipment damage injury or death Read all of the following instructions before attempting to move lift remove packaging from or preparing unit for installation A WARNING Risk of sharp edges splinters and exposed fasteners
6. If a forklift will be used to move either unit verify that the floor will support the forklift Unpack the Liebert Air Economizer A WARNING Risk of sharp bands under tension Can cause personal injury The bands securing the Liebert Air Economizer to the skid are under extreme tension Only properly trained and qualified personnel wearing appropriate safety headgear gloves shoes and glasses should attempt to remove packaging from this unit Save all recyclable materials for reuse Dispose of any non recyclable materials properly 1 Cut the bands securing the Liebert Air Economizer to its skid 2 Remove any protective and cushioning material 3 Remove the plastic bag from the unit Installation 2 0 INSTALLATION 2 1 2 2 2 2 1 Install the Liebert Air Economizer in accordance with the instructions in this manual and site specific documentation A WARNING Risk of heavy unit falling Can cause equipment damage personal injury and death The Liebert Air Economizer is heavy The heaviest unit weighs more than 480lb 218kg without its exterior panels Verify that all lifting and supporting mechanisms and methods are adequate for the weight of the Liebert Air Economizer being installed See the documentation included with the unit When raising the Liebert Air Economizer secure it to sufficiently strong overhead structure with straps slings and or belts for safety to prevent it from falling Spreader
7. Liebert Air Economizer equipped with 0 10VDC or 2 10VDC dampers The Liebert COM is capable of driving two independent damper motors or can be set up through the software to output a single signal where the dampers are inversely driven The primary cooling unit responds to sensors that monitor the temperature and humidity of the outdoor air return air and supply air If outdoor conditions are within the tolerances set the primary cooling unit opens the Liebert Air Economizer s dampers varying amounts to use outdoor air for cooling When outdoor conditions are too warm or humid for cooling the primary cooling unit closes the Liebert Air Economizer s dampers taking it out of the cooling process NOTICE Risk of high or low humidity Can cause environmental conditions that are outside equipment requirements While the Liebert Air Economizer is operating the primary cooling unit s humidification and dehumidification are inhibited If humidity level is important to operational requirements it must be controlled by other methods during operation of the Liebert Air Economizer While the primary cooling unit is cooling without the Liebert Air Economizer the primary cooling unit will control humidity levels according to its setpoints NOTICE Risk of freezing temperatures Can cause equipment and property damage Low outdoor temperatures can produce freezing conditions that adversely affect cooling systems employing water particularly when
8. Outside North America 00800 1155 4499 Single Phase UPS amp Server Cabinets liebert upstech emerson com 800 222 5877 Outside North America 00800 1155 4499 Three Phase UPS amp Power Systems 800 543 2378 Outside North America 614 841 6598 Environmental Systems 800 543 2778 Outside the United States 614 888 0246 Locations United States 1050 Dearborn Drive P O Box 29186 Columbus OH 43229 Europe Via Leonardo Da Vinci 8 Zona Industriale Tognana 35028 Piove Di Sacco PD Italy 39 0499719111 Fax 39 049 5841 257 Asia 29 F The Orient Square Building F Ortigas Jr Road Ortigas Center Pasig City 1605 Philippines 63 2 687 6615 Fax 63 2 730 9572 EmersonNetworkPower com IM Racks amp Integrated Cabinets IM connectivity IM Embedded Power IM Power Switching amp Controls IM Services IM DC Power IM Infrastructure Management amp Monitoring IM Precision Cooling Emerson Business Critical Continuity Emerson Network Power and the Emerson Network Power logo are trademarks of Emerson Electric Co or one of its affiliated companies 2010 Emerson Electric Co IM Surge Protection
9. data centers health care and industrial facilities Emerson Network Power provides innovative solutions and expertise in areas including AC and DC power and precision cooling systems embedded computing and power integrated racks and enclosures power switching and controls infrastructure management and connectivity All solutions are supported globally by local Emerson Network Power service technicians Liebert AC power precision cooling and monitoring products and services from Emerson Network Power deliver Efficiency Without Compromise by helping customers optimize their data center infrastructure to reduce costs and deliver high availability While every precaution has been taken to ensure the accuracy and completeness of this literature Liebert Corporation assumes no responsibility and disclaims all liability for damages resulting from use of this information or for any errors or omissions O 2010 Liebert Corporation All rights reserved throughout the world Specifications subject to change without notice Liebert is a registered trademark of Liebert Corporation All names referred to are trademarks or registered trademarks of their respective owners SL 18845 REV2 05 11 Emerson Network Power The global leader in enabling Business Critical Continuity IM AC Power IM Embedded Computing IM Outside Plant Technical Support Service Web Site www liebert com Monitoring liebert monitoring emerson com 800 222 5877
10. position they were in when power was present Spring return operation during a no power condition should always be verified at startup While the Liebert Air Economizer is not operating which could be due to the outdoor air conditions a manual lockout through the Liebert COM or a Unit Off state will result in 2VDC being present on the associated indoor and outdoor analog outputs The 2VDC signal must result in the outdoor damper being closed and return damper opened During full Liebert Air Economizer operation theLiebert COM will send 10VDC to the return and outdoor damper which must open the outdoor damper and close the return damper to its minimum position of 15 NOTICE Risk of improper operation Could cause frozen coils resulting in degraded operation water leaks equipment damage and building damage Failure to verify that the indoor and outdoor damper operation is correct could result in the freezing of chilled water coils condensation within the data center or a main fan overload 17 Operation Figure 10 Liebert DS setpoints screen page 4 of 6 SETPOINTS pg 4 of 6 4 UNIT 01 PASSWORD Actual Level 0 222 DT between Room Outdoor Type Disable DT between Room Air Outdoor SF DT between Room FC Type Disable DT between Room Air FC Fluid F Minimum CW Temp Disable Minimum CW Temp Value Lockout FC at FC Fluid below Transition Change 4 for next previous unit to select parameter then gt
11. the water is not moving through the pipes When cooling system water is not moving frozen waterlines burst coils and water damage are possible The outside damper must be set so that it is fully closed when freezing temperatures are possible and the cooling system is not operating see 4 2 4 Disable the Liebert Air Economizer This can be achieved by either connecting a freeze stat that interrupts the economizer signal or by wiring a freeze stat directly into the Liebert iCOM s customer input The risk of freezing is increased unless the proper amount of glycol is added to the chilled water unit loops NOTICE Risk of infiltration of odors smoke and particulates from outside air Can cause environmental conditions that are outside equipment requirements The Liebert Air Economizer does not remove odors smoke gases or particulates from the outside air used for cooling These must be controlled by other methods 14 Operation 4 1 4 1 1 Operational Condition Normal Operation When the Liebert Air Economizer is being used for cooling both the outside air damper and the room return air damper are active in an opposing relationship The cooling requirement and temperature of the outdoor air will determine the position of the outside air damper It will range from fully closed to fully open As the outside air damper moves toward fully open the return air damper will close to a minimum of 15 The 15 minimum is to make sure t
12. to change parameter to confirm DT between Room Outdoor Type Sets the activation point of the ambient dry bulb outdoor temperature as 1t relates to either an indoor actual temperature or temperature setpoint If set to Temp the outdoor dry bulb temperature is compared to the return temperature actual value If set to Set the outdoor dry bulb temperature is compared to the return temperature setpoint If set to Disable the outdoor temperature will not be compared to the return sensor value for activation When set to Temp or Set the outdoor temperature must be lower than the room temperature setpoint or the actual return temperature sensor reading In most applications this parameter will be set to Temp because the outdoor air temperature will reduce cooling costs as long as the outdoor air is below the return air temperature to the primary cooling unit This remains true even when the outdoor temperature is higher than the supply control setpoint The following examples assume that the unit is set for supply air control and that the moisture content of the outdoor air is within the allowable range Example 1 Return Temperature 90 F 32 C Outdoor Temperature 80 F 27 C Supply Air Temperature 60 F 16 C The conditions in this example would result in a reduction of 10 F entering the unit and would extend the operating range of the Liebert Air Economizer The outdoor damper woul
13. to operate the unit s blower 2 Find the restricted airflow switch in the cooling unit see Figure 7 the illustration shows the switch location in both the Liebert CW and Liebert DS units 3 Turn On the Liebert DS or Liebert CW the cooling unit must be running for the switch to be adjusted 4 Turn the restricted airflow switch alarm setpoint knob clockwise until it trips The cooling unit will also alarm 5 Turn the setpoint knob counterclockwise a half a turn for standard cooling units about 75 airflow b one full turn for cooling units equipped with a variable frequency drive about 50 airflow c or to the desired setpoint 12 Installation Checklist 3 0 INSTALLATION CHECKLIST OP SOO Ne Liebert Air Economizer received unpacked and checked for damage Liebert Air Economizer positioned and secured to indoor cooling unit Duct work to outdoor opening properly sloped to prevent precipitation and dust infiltration Outdoor air duct opening properly screened to prevent vermin from entering Outdoor air duct opening protected against human intrusion Filters installed in air intake duct work Restricted airflow switch settings made Low voltage connections made 13 Operation 4 0 OPERATION Liebert cooling units control the Liebert Air Economizer with the analog outputs of the Liebert COM control The Liebert COM can be used with a Liebert Air Economizer or with a previously installed
14. 01412 FRONT VIEW Ref only Rev 0 Table 2 Liebert DS model dimensional data 28 105kW 8 30 tons Model and Compressor Dimensions inches mm Flow Rate Type A B Cc D E 028 042 5500 cfm 2596 I s or less Semi Hermetic 82 2083 86 2184 56 1422 14 5 368 91 2311 028 042 5500 cfm 2596 l s or less Scroll 69 1755 73 1854 56 1422 14 5 368 91 2311 028 042 more than 5500 cfm 2596 l s Semi Hermetic 82 2083 86 2184 56 1422 17 5 445 88 2235 028 042 more than 5500 cfm 2596 I s Scroll 69 1755 73 1854 56 1422 17 5 445 88 2235 053 077 Semi Hermetic 105 2667 109 2769 79 2007 17 5 445 88 2235 053 077 Scroll 94 2388 98 2489 79 2007 17 5 445 88 2235 105 All Types 128 3251 132 3353 102 2591 17 5 445 88 2235 Source DPN001412 Rev 0 Installation 2 3 Wiring the Liebert Air Economizer A A WARNING Risk of electric shock Can cause injury or death Disconnect all local and remote electric power supplies before working within The Liebert Air Economizer must be connected by a licensed and qualified electrician only Ensure that the Liebert Air Economizer cooling unit are electrically isolated for the duration of the connection operation and are secured against unauthorized startup WARNING Risk of electric shock Can cause injury or death Disconnect all local and remote electric power supplies before working within Prior t
15. 4 Adjust the Restricted Airflow Switch ooooooooooooororrrrro oo 12 3 0 INSTALLATION CHECKLIST coco coc cee eee eee eee eee eee eee ee anna 13 4 0 OPERATION SS 22 a eee eect te tdo aye eee ee oe at aioe Me hana 14 4 1 Operational Condition na 15 LIA Normal Operation sre cc 3 tes E Seaweed Tea ioe a 15 4 2 System Overview ii rs En ae Ce A Ph Ee divas Gok Ga eae 15 ALA Outiot Service cia BN ba a a anes bie hie la tee Dende edn e a ia 17 4 2 2 Fan Speed Control oooooooocooocoococ coin 22 4 2 3 Variable Speed Fan Operation VFD and EC Fan 0 0 0c ec nes 22 4 2 4 Disable the Liebert Air Economizer 00 eee eee eens 22 4 3 Control Menu Settings ices epuap geto y a OA a alae ae 22 4 3 1 Liebert Air Economizer Status Screen 0 0 ccc eee eee eee eens 23 4 4 Temperature Control Modes P and PL oa cad edecs deed eee eh a iaa 23 AAT Proportional Controla ia E eh Pa ete he Bs BRS OE OO 23 44 2 Proportional Integral Control 0 0 eee eens 23 44 9 Integral Wind Up A A ec NN eS BIS se GES SS a ics 8 23 AAA Controller Tuning gt 2 24506 ts Be Bek oe BOO Ba ded BR eae Sea BI ERGs Bh SAS I BR 24 5 0 MAINTENANCE Sa o os e Seles a Bate St eed ee el ewe Se ee de 26 6 0 TROUBLESHOOTING pon Sbb E ek eae od eee 27 Figure 1 Figure 2 Figure 3 Figure 4 Figure 5 Figure 6 Figure 7 Figure 8 Figure 9 Figure 10 Figure 11 Figure 12 Figure 13 Figure 14 Figure 15 Table
16. Can cause personal injury Only properly trained and qualified personnel wearing appropriate safety headgear gloves shoes and glasses should attempt to move lift remove packaging from or prepare this unit for installation Product Description 1 3 1 Handle the Liebert Air Economizer With Skid Always keep the unit upright indoors and protected from damage If possible transport the unit using a pallet jack or forklift Personnel should be properly certified and trained to move and rig equipment If using a forklift make sure that the forks if adjustable are spread to the widest allowable dis tance that will fit under the skid When moving the skidded Liebert Air Economizer with a forklift do not lift the unit any higher than 6 152mm If circumstances require the unit to be lifted higher than 6 152mm all per sonnel not directly involved in raising the unit must be no closer than 20 feet 5m from the lift point of the unit 1 3 2 Move the Liebert Air Economizer With a Forklift 1 4 1 2 Remove the exterior packaging Align forklift with either the front or rear of the unit Ensure that the forks are locked at the widest position that will fit under pallet Drive the forklift forward sliding the forks under the base of the unit Move the Liebert Air Economizer as close to its installation location as possible NOTICE Verify that the floor will support the cooling unit and the Liebert Air Economizer
17. EMERGENCY OVERRIDE can be triggered This allows airflow to pass over the sensors to get an accurate reading before any emergency modes are activated Figure 12 Outdoor sensor data screen Economizer page 2 of 3 4 UNIT 01 SA4 PASSWORD Actual Level 3 2977 5724 Outdoor Air Sensor Temperature 79 F Sy Outdoor Air Sensor Humidity 33 0 S 24E Outdoor Air Pressure 1013 2hPa 5 24 Saturation Pressure WaterVapor 33 8hPa S744 Saturation Pressure Ice 42 8hPa SIE Partial Pressure Water Vapor 11 1hPa S9 Volume Mixture Ratio ppm ol 0 0ppm 52440 Humidity Ratio g kg wet 6 89 k Wet Bulb Temperature 59 F 4 for next previous unit and gt to select parameter then gt to change parameter to confirm 20 Operation Figure 13 Damper settings and limits screen Economizer page 3 of 3 4 UNIT 01 gt 5 4 PASSWORD Actual Level 3 SA Return Damper Open Syav4e Return Damper Closed 57 44 Return Damper Minimum Limit At 87 74 Outdoor Damper Open 5724 Outdoor Damper Closed 57242 Outdoor Damper Position S7 Return Damper Position 4 for next previous unit and gt to select parameter then gt to change parameter to confirm Parameters SA23 through SA33 of the Liebert Air Economizer screen show the return and outdoor damper limits and current position The return damper will receive a 2 DC signal when fully open and an 8 10VDC signal at its most closed position The outdoor damper wil
18. IM Precision Cooling For Business Critical Continuity Liebert Air Economizer for Liebert DS Liebert CW amp Liebert Challenger 3000 User Manual O EMERSON Network Power GENERAL SAFETY GUIDELINES Before beginning the installation of the Liebert Air Economizer read all instructions verify that all the parts are included and check the nameplate to be sure the Liebert Air Economizer voltage matches available util ity power Follow all local and national codes A A A O AD WARNING Risk of electric shock Can cause injury or death Disconnect all local and remote electric power supplies before working within WARNING Risk of unit falling over Can cause death injury and equipment damage The Liebert Air Economizer is top heavy Use extreme caution and care when moving and installing this unit CAUTION Risk of piping and component rupture May cause injury or equipment damage Closing service valves may isolate liquid refrigerant causing high pressure and rupture of piping Do not close valves without following recommended procedures for repair maintenance and replacement of components Install pressure relief valves in field piping that may become isolated by service valves NOTE This document is to be used together with site specific documentation and documentation for other parts of the system heat rejection devices and cooling modules NOTE Before any action that could
19. bars may be required with some lifting or securing methods to prevent damaging the Liebert Air Economizer General Considerations Emerson Network Power recommends installing the cooling unit to be equipped with the Liebert Air Economizer then installing the Liebert Air Economizer and then installing the ductwork The ductwork to the outside must be constructed to mate with the outside air intake on the rear of the Liebert Air Economizer For dimensions and specifications see Figures 2 3 and 4 and Tables 1 and 2 Install the Liebert Air Economizer Preliminary Steps 1 Remove the exterior panels from the Liebert Air Economizer to lighten it and to gain access to the unit s frame 2 Attach the safety straps slings or belts to the Liebert Air Economizer s frame Attach the lifting method or mechanism to the Liebert Air Economizer o 4 Raise the Liebert Air Economizer and position it on the cooling unit and connect the units as described in either 2 2 1 Position the Liebert Air Economizer on a Liebert CW or 2 2 2 Position the Liebert Air Economizer on a Liebert DS Position the Liebert Air Economizer on a Liebert CW The Liebert CW has flanges to help position and attach the Liebert Air Economizer 1 Fit the Liebert Air Economizer over the flanges on either end of the Liebert CW 2 Fit the Liebert Air Economizer inside the flange on the rear of the cooling unit Secure the Liebert Air Economizer to the Liebert CW The Lieb
20. brated To calibrate follow the next steps Place a voltmeter on Terminals 24 and 50 Locate the Liebert Air Economizer air flow sensor Turn the airflow sensor counterclockwise until the voltmeter indicates OVAC Then turn the airflow sensor adjustment screw clockwise until the voltmeter indicates 24VAC When the voltmeter shows 24VAC turn the screw counterclockwise one full turn Variable Speed Fan Operation VFD and EC Fan Upon startup after a loss of power to the Liebert COM control board the main fan will operate at 100 for the first 5 minutes of operation After running at 100 for 5 minutes the standard fan control will be able to modulate the fan Does this apply in Manual Mode QUe Costas Disable the Liebert Air Economizer The Liebert Air Economizer can be disabled through a deactivation switch field installed and wired to Terminals 24 and 51 in place of the factory supplied jumper Removing a factory installed jumper will deactivate the unit s function see Figure 14 Deactivating the Liebert Air Economizer will transfer all cooling to the primary cooling unit Figure 14 Deactivation switch Liebert Air Economizer Deactivation Switch Terminals 24 and 51 4 3 Factory Installed Jumper Customer must remove jumper and connect normally closed contact to Terminals 24 and 51 Open the contact to deactivate y 8 1 the Liebert Air Economizer E functionality N 8 Main unit will continue to run withou
21. cause a disturbance in the cooling system s function is begun the facility manager MUST be informed In addition after the action is taken and the work is finished the facility manager MUST be informed TABLE OF CONTENTS GENERAL SAFETY GUIDELINES o o oo eee eee eee eee INSIDE FRONT COVER 1 0 PRODUCT DESCRIPTION 02 2c cece eee eee eee ee eee ee eee a 1 1 1 General Product Information 1 1 1 1 Customer Supplied Equipment and Ductwork 0 0 0 eens 1 1 2 Equipment Inspection on en NA BAN ANN GN GS ele 2 1 3 Equipment Handling 34 064 a BSR ae Oe ea a ae lee ete is 2 1 3 1 Handle the Liebert Air Economizer With Skid ii 3 1 3 2 Move the Liebert Air Economizer With a Forklift ooooooooooooo 3 1 4 Unpack the Liebert Air Economizer 0 0 0000 eee eens 3 2 0 INSTALLATION se SE SN Mee Sheed es Si Pe BREE PEO ER 4 2 1 General Considerationsi citar foi er ede be eet ee Wed bas Sh eee 4 2 2 Install the Liebert Air Economizer Preliminary Steps ooo ees 4 2 2 1 Position the Liebert Air Economizer on a Liebert CW 0 0 000 4 2 2 2 Position the Liebert Air Economizer on a Liebert DS o o o oooooooooooooo o 5 2 3 Wiring the Liebert Air Heonomizers boris eden bade ka la eee Eee ees 9 231 Ware the Dampers cscs ste ceed RS La BE Ge Pe SN BPE LE A ee AN 10 2 3 2 Outdoor Air and Return Air Temperature and Humidity Sensor Connections 11 2
22. conomizer Available The Liebert Air Economizer control allows the range of outdoor air acceptable for cooling to be narrowed by adjusting the Humidity Ratio Min and Max settings Refer to a psychrometric chart before adjusting humidity ratios Temperature Control Modes P and PI Proportional Control The proportional mode adjusts the output signal in direct proportion to the controller input by comparing the current temperature and the setpoint The adjustable parameters to be specified are the setpoint S102 and the proportional band S104 The larger the difference between temperature and setpoint the more the controller output will increase For instance a 10 of scale difference will change the controller output by 10 A proportional controller reduces error difference between temperature and setpoint but does not eliminate it an error between the actual and desired value will normally exist Proportional Integral Control The additional integral mode corrects for error that may occur between the desired value setpoint and the process output automatically over time The adjustable parameter to be specified is the integral time Ti of the controller S105 Integral Wind up When a controller that possesses integral action receives an offset signal the integral term of the controller will increase at a rate governed by the integral time of the controller This will eventually cause the manipulated variable to reach 100 or 0
23. d be 100 open and the mechanical cooling would be utilized to achieve the 60 F 16 C supply temperature setpoint Example 2 Return Temperature 75 F 24 C Outdoor Temperature 80 F 27 C Supply Air Temperature Setpoint 60 F 16 C In this example the cooling unit would not use outdoor air because it is warmer than the actual return temperature to the CRAC Example 3 Return Temperature 75 F 24 C Outdoor Temperature 40 F 4 C Supply Air Temperature 60 F 16 C In this example the cooling unit would open the outdoor damper based on the amount of cooling needed to satisfy the supply air temperature setpoint The unit should be able to satisfy the sup ply air setpoint with Liebert Air Economizer operation only 18 Operation DT between Room Air Outdoor Sets the delta that must be achieved between the outdoor temperature and either the return setpoint or return actual reading to enable the Liebert Air Economizer DT between Room FC Type Determines the method to activate the water circuit on dual cool and free cool units When this parameter is set to Contact a dry contact closure can be used to activate the free cooling circuit When this parameter is set to Value the delta between the water temperature of the free cooling circuit and the actual room temperature are compared DT between Room Air FC Fluid Sets the delta between the actual room temperature and the fr
24. e outdoor temperature requirements have been met to use economization When NOK is shown the outdoor temperature is outside the operating range set in the Liebert COM control Stop ECO at Setpoint Sets the temperature when the Liebert Air Economizer will be disabled due to an increasing outdoor air temperature This parameter is added to the return air sensor setpoint and then compared to the outdoor temperature reading If the outdoor temperature reading exceeds the return air temperature setpoint plus this parameter the Liebert Air Economizer will be disabled This is factory set at 20 F 6 7 C Economizer Mode Displayed when the Liebert Air Economizer is available for use Dew Point Calculated Displays the actual outdoor dewpoint based on the outdoor sensor Enable Economizer Sets the Liebert Air Economizer operation to one of the following modes These selections only determine if the Liebert Air Economizer is available for use they will not determine or override damper position Damper position is always controlled by the sensor set to control temperature i e Return Supply Sensor Economizer Override Sets the indoor temperature when the Liebert Air Economizer will be locked out Even when all other parameters are satisfied the Liebert Air Economizer will be locked out when the return air temperature sensor reads this value Delay After Fan Start Sets the delay from the time the unit has been started until the ECO
25. ee cooling fluid temperature to determine if cooling can be provided Minimum CW Temp FEnables the temperature at which free cooling can operate independently without assistance of the compressor circuit Minimum CW Temp Value Sets the water temperature at which 100 free cooling can be provided to handle the full room load When the fluid temperature is below this setting then the compressors will no longer turn on until the water temperature is above the minimum CW Temp Lockout FC at FC Fluid below The temperature that turns off the free cooling circuit when the water temperature is too low This setting prevents frost from building up on the free cooling pipes when the outdoor ambient is extremely low Transition Change Applied over the Cooling Filter at 0 100 when the cooling signal makes the transition between cooling and dehumidification This will smooth the cooling capacity changes between dehumidification and cooling Figure 11 Service Economizer page 1 of 3 Economizer page 1 of 3 4 UNIT 01 gt PASSWORD Actual Level 3 222 SJA0 Enable Economizer Yes No Remote Status Min Act Max SIA Humidity Ratio OK NOK 5T 8 0 11 0 SYNOle Wet Bulb Temp OK NOK 55 F SANG Outdoor Temp OK NOK 73 F SIN0 4 Stop ECO at Setpoint 25 F SA Economizer Mode ON OFF SAOR Dewpoint Calculated 48 F S7440 Economizer Override At 102 F SM Delay After Fan Start 5 min 4 for next previous unit gt to select para
26. ert Air Economizer must be attached to the cooling unit to prevent movement Use field supplied sheet metal screws with blunt tips to connect the units on each end NOTICE Do not drill or screw into the rear of either the Liebert Air Economizer or the Liebert CW Screws should be used on both ends of the units 1 Working from inside drill two holes in the flange on each end of the Liebert CW and into the frame of the Liebert Air Economizer 2 Insert the sheet metal screws into the frame of the Liebert Air Economizer and tighten until the units are securely attached 3 After the units are securely connected remove the safety straps attached in Step 2 in 2 2 Install the Liebert Air Economizer Preliminary Steps 4 Clean up any metal particles and other debris from the installation 5 Reattach the exterior panels to the Liebert Air Economizer Installation 2 2 2 Position the Liebert Air Economizer on a Liebert DS The Liebert DS has no flanges on top Position the Liebert Air Economizer on top of the Liebert DS so that it covers the air entry opening and the plenum and unit will be flush on the ends and back when the panels are installed A WARNING Risk of heavy unit falling Can cause equipment damage personal injury or death The Liebert Air Economizer must be supported until it is securely connected to the Liebert DS to prevent it from slipping off the cooling unit 1 Locate the holes in the rear filter suppor
27. hat air remains circulating near the return air sensor If the return air sensor is moved to another position where there is constant circulation of air in both outdoor and indoor modes then the minimum 15 indoor damper position can be removed NOTICE Risk of improper operation Can cause degraded cooling and ventilation operation because of improper building air pressure The incoming air from the outside damper requires expelling an equal volume of air through a field provided powered relief air vent see Figure 1 The volume that must be expelled will vary from 0 to 80 of the total airflow for all Liebert Air Economizer units The powered relief system should be sized for 80 of the total airflow for all Liebert Air Economizer units in the conditioned space and to maintain minimal building air pressure Figure8 Operational ranges for chilled water systems and for compressor chilled water systems ES 4 2 Trersen gt Variable System Overview Controller settings will vary depending on the application The objective of all settings is the same to expel warm air from the conditioned space and bring in cooler air through the Liebert Air Economizer This function is monitored continuously by the Liebert COM that controls the Liebert Air Economizer Figure 9 shows an example of the air flow pattern of a Liebert Air Economizer system The indoor sensor must be positioned where there i
28. hermistor as shown in Figure 7 it must be routed from the cooling unit and secured The illustration shows connections for the Liebert DS and Liebert CW NOTICE Turn Off all power to the indoor cooling unit before connecting cables or wires Failure to do so may damage this equipment Figure 6 Temperature and humidity sensor connections Liebert DS and Liebert CW Secure Ring Terminal for Sensor Cable Shield Into the Back of the Electric Box Earth Ground Connect P67 on the Control Board to P66 on the Return Air T H Sensor Both Sensors and Cables are Shipped in Boxes Inside the Liebert Py G Air Economizer Return Air N T H Senso p u 5 Using Cable Provided Outdoor Air T H Fs Sensor P E identified wih Wa Ji outdoor label NL i DETAIL D Connect P67 on the Return Air T H Sensor Mount Return Air to P66 on the Outdoor T H Sensor Indoors Mount Outdoor Air T H Sensor Using Above Unit Return Air Sensor Inside Outdoor Air Plenum Connect P66 on the Outdoor Air T H Sensor to P67 on the Return Air T H Sensor Using Cable Provided Cable Provided Route Cable Through y Customer Created Hole In Plenum Then Seal Connect P66 on the Secure Ring Terminal Return Air T H Sensor for Sensor Cable Shield DETAIL B DETAIL C to P67 on the Control Board Into Metal Duct Outdoor Air Return Air Using Cable Provided Ea
29. l receive a 10VDC signal when fully open and a 2VDC signal when fully closed If the outdoor conditions do not permit Liebert Air Economizer usage then the outdoor damper will fully close and the return damper will fully open for normal operation of the primary cooling unit The actual outdoor and return damper positions are shown at parameters SA29 Outdoor Damper Position and SA30 Return Damper Position see Figure 13 Air Economizer activation relay The K11 relay is activated when the Liebert COM determines that the Liebert Air Economizer is available for use This relay will remain active during a BMS remote deactivation of the Liebert Air Economizer Adjusting control limits with Air Economizer units A cooling unit equipped with a Liebert Air Economizer will be factory set to utilize outdoor air based on the current ASHRAE standards When the outdoor damper is opened Liebert COM will automatically disable any humidification control as humidification and dehumidification will not be able to overcome the amount of outdoor air being used However other units not equipped with Liebert Air Economizers may continue to humidify and dehumidify the data center If the room is equipped with a mixture of Liebert Air Economizer and other types of units then follow these steps 1 Identify the allowable outdoor air conditions entered into the Liebert COM control Upper dewpoint 57 5 Lower dewpoint 44 Dry bulb is limited based on the se
30. lection in S135 2 Set the deadband and proportional band of the units based on the allowable outdoor air Setpoint 41 Proportional band 1 Deadband 17 Return Temperature Setpoint 75 F NOTE Even when the return temperature setpoint is not being used for cooling control it must be set to operate in Compensated or Predictive humidity control 3 The units should also be set for predictive humidity control which will compensate for any deviation from the Return Air Temperature setpoint and Relative Humidity Control 21 Operation 4 2 2 4 2 3 4 2 4 Fan Speed Control When the fan control mode is placed into Auto and the supply air sensor is set to Control the fan will modulate with the first stage of cooling Fan Ramps with Liebert Air Economizer when available and will be at 100 when the outdoor damper is at 100 This will provide the most capacity from the Liebert Air Economizer and will help in holding off the mechanical cooling 2nd Stage When the Liebert Air Economizer is not available the fan will still ramp with the first stage of cooling but the first stage will be either a chilled water valve or compressor operation For other control modes refer to the variable speed fan section of the LiebertiCOM manual Those modes are not affected by the Liebert Air Economizer operation Reduced Economizer Air Flow During startup the Liebert Air Economizer airflow sensor will need to be cali
31. meter then gt to change parameter to confirm Enable Economizer Sets the Liebert Air Economizer operation to one of the following modes These selections only determine if the Liebert Air Economizer is available for use they do not determine or override damper position Damper position is always controlled by the sensor set to control temperature i e Return Supply Sensor Yes This parameter will operate the Liebert Air Economizer based on the outdoor sensor reading and will allow the Liebert COM to determine if the conditions are within the acceptable range of operation NO This parameter will disable the Liebert Air Economizer and will not allow Liebert Air Econo mizer to operate even if the outdoor conditions are acceptable Remote This parameter will enable the Liebert Air Economizer and ignore the outdoor Liebert iCOM sensor even if the conditions are outside the range of operation 19 Operation Humidity Ratio Sets the minimum and maximum limits of outdoor air based on the amount of moisture content The humidity ratio is set based on pounds of moisture per pound of dry air This is equivalent to the dew point temperatures Wet Bulb Temperature Read only value that displays the outdoor wet bulb temperature This reading will be in metric values Outdoor Temperature Displays the actual outdoor temperature based on the Temperature Humidity sensor Sensor C When this parameter shows OK th
32. ng every 4 6 weeks for precipitation infiltration Alter outside opening as required 2 Check screen and filters monthly or more often depending on air quality Replace or clean as necessary 3 Inspect the damper system louvers motor and linkage at startup and every 4 6 weeks for proper adjustment dust dirt and corrosion Clean any matter that will inhibit air flow with compressed air or commercial coil cleaner 4 Check for bent or damaged components and repair as necessary 5 Monitor for air leaks during normal operation check for air leakage every six months 6 Verify powered relief air system during normal operation check operation every six months Perform all maintenance on your indoor cooling unit Liebert DS or Liebert CW as required 26 Troubleshooting 6 0 TROUBLESHOOTING Table 3 Liebert Air Economizer troubleshooting Problem Possible Cause Remedy Blocked filter Replace or clean filter Improper duct size Enlarge duct Reduced Airflow Improper relief air exhaust fan Install properly sized operating fan Debris on screens Clean debris off screen Air intake location Move air intake Sensors not plugged in Connect sensors High Low Temp Control not set properly Adjust control alarm setpoints Plenum installed backwards Remove plenum and reinstall correctly ian aay Liebert Ar Economizer no nba at Air Economizer use primary cooling Lack of vapor barrier Widen humidity ala
33. o beginning installation shut down the cooling unit disconnect it from input power and secure it against unauthorized startup CAUTION Risk of sharp edges and heavy parts May cause personal injury or equipment damage Wear gloves to prevent injury to hands Damage to wiring or components can make unit unsafe to operate Use caution when installing wiring to prevent damage to factory wiring Install protective bushings in wiring knockouts as required Do not disturb factory wiring or route field installed wiring over electrical terminals Use NEC Class 1 wiring for all hazardous voltage electrical power supplies Check and retighten all wiring connections before starting the unit NOTE Before beginning to install the Liebert Air Economizer read all instructions verify that all the parts are included and check the nameplate to be sure the Liebert Air Economizer voltage matches available utility power Follow all local and national codes Installation 2 3 1 Wire the Dampers The damper wiring is coiled and attached to the interior of the Liebert Air Economizer The locking connectors must be snapped into similar connectors in the primary cooling unit for the dampers to operate The wiring must also be secured to the Liebert Air Economizer s frame to protect it NOTICE Turn Off all power to the indoor cooling unit before connecting cables or wires Failure to do so may damage this equipment To connect the damper wiring
34. onomizer is an option for Liebert DS downflow units Liebert CW chilled water downflow and Liebert Challenger 3000 downflow units The Liebert Air Economizer uses cool outdoor air in mild climates to condition indoor spaces It is functional only on cooling units with Liebert iCOM controls that have been factory wired and configured to accommodate the Liebert Air Economizer The Liebert Air Economizer is supplied with electrical wiring for connection to the cooling unit outdoor air sensors return air sensors and a temperature and humidity sensing unit Special firmware is loaded into the primary cooling unit at the factory to permit the primary cooling unit to control the Liebert Air Economizer NOTE When upgrading the firmware for the primary cooling unit either a Liebert DS downflow unit or Liebert CW downflow unit ensure that the new firmware includes the Liebert Air Economizer controls If in doubt contact the factory Customer Supplied Equipment and Ductwork Installation and operation requires outside air entry ductwork with louvers screening and filtration to prevent intrusion of precipitation particulates vermin and unauthorized entry see Figure 1 Proper installation also requires a customer provided powered relief air discharge to rid the structure of the outside air drawn in for cooling The relief air discharge must be equivalent to the airflow of the total of all cooling systems equipped with the Liebert Air Economizer
35. rm range Moisture enters unit Improper rain shielding Install overhang to keep rain out of intake Improper duct design Redesign duct with proper slope Improper location of inlet air Move inlet air duct Contaminants or particulates enter conditioned space Improper air filtration Corrosive Environment Install higher efficiency filters or correct installation of current filters Contact Liebert Corporation at 1 800 LIEBERT Pollen objectionable or noxious odors or gases enter conditioned space Filters will not remove pollen or odors Deactivate the Liebert Air Economizer Air damper outside or room return does not Motor not oriented properly Linkage not adjusted Adjust motor position Adjust linkage open or does not close Corrosion Improper wiring Clean corrosion and lubricate properly Check and correct wiring connections No damper function or signals to damper Liebert Air Economizer software is not present in control or was overwritten during software upgrade Verify Liebert Air Economizer screens are missing and install Liebert Air Economizer software to Liebert iCOM control 27 Ensuring The High Availability Of Mission Critical Data And Applications Emerson Network Power a business of Emerson NYSE EMR is the global leader in enabling Business Critical Continuity from grid to chip for telecommunication networks
36. rth Ground T H Sensor T H Sensor DPN001449 Pg 4 Rev 2 11 Installation Figure 7 Supply limit thermistor wiring and restricted airflow switch location 120 Frame Chilled Water Restricted Airflow Switch Location 2 4 P13 Factory Connected Locations for Liebert DS and Liebert CW units shown Note location for your unit Liebert DS CW026 CW084 Restricted Airflow Switch Location P13 Factory Connected t Uncoil and Extend Cable Through Holes Provided in Bottom of Unit pocos 060000000 Secure Supply Air Thermistor in Airflow Liebert DS and CW026 CW084 unit location Uncoil and Extend Cable Through Holes Provided in Bottom of Unit Restricted Airflow Switch Alarm Secure Supply Air Thermistor Setpoint Knob In Airflow 120 Frame Chilled Water Location ADJUSTMENT INSTRUCTIONS 1 Unit must be running 2 Turn the adjustment knob clockwise until you hear it trip Unit will also alarm 3 Turn the adjustment knob back counterclockwise DPNO00 1449 1 2 turn for standard units DETAIL E Pg 05 Rev 02 1 turn for units with VFD Restricted Airflow Switch or to desired setpoint Adjust the Restricted Airflow Switch The restricted airflow switch inside the cooling unit must be adjusted for the Liebert Air Economizer to operate properly and efficiently To adjust the switch 1 Inspect all connections restore power
37. s Panel for 2 Pre Filters FRONT VIEW DPN001332 Reference only Rev 0 Installation Figure 3 Dimensions Liebert Air Economizer and Liebert CW models CW026D CW084D Room Return Air Damper TOP VIEW Duct Flange A San B 7 864mm c 2 1 25mm 51mm 30 1 16 Duct Collar 1 25mm 764mm 1 SA ES Plenum 22 559mm 5 oe 4 25mm Access Panel for 2 Pre Filt Outside Air TA ee Damper 79 72 1 BACK VIEW SIDE VIEW i DPN001411 FRONT VIEW Rev 0 Reference only Table 1 Dimensions Liebert Air Economizer and Liebert CW models CW026D CW084D Dimensions inches mm Liebert CW Model A B Cc CW026D CWO038D CW041D 46 1168 50 1270 40 1016 CS051D CW060D 70 1778 74 1880 64 1626 CWO76D CW084D 95 2413 99 2515 89 2261 Source DPN001411 Rev 0 Installation Figure 4 Dimensions Liebert Air Economizer and Liebert DS downflow units 28 105kW 8 30 tons Room Return Air Damper TOP VIEW 34 A Duct Flange 4 864mm B 25mm a Duct Collar 30 1 16 2 1 8 c 4 764mm 54mm 7 a Plenum D 914mm 5mm Outside Air Damper E 76 930mm Liebert DS Unit 1 BACK VIEW SIDE VIEW z Access Panel for 2 Pre Filter amp 4 Unit Filters Ne 356mm DPN0
38. s airflow when the system is in full economizer operation and when the system is operating in non economizer mode If the indoor damper position has been changed to 0 from the factory default of 15 then the indoor sensor must be moved preferably to the hot aisle 15 Operation Figure 9 Air flow pattern of a Liebert Air Economizer system MAA Outdoor it i Temperature Humidity ES oor ES IS Sensor amper Roof Mia Indoor Indoor Temperature Humidity Damper Sensor P Return Room LLALLA Pressure Relief Equipment Rack Equipment Rack Supply Sensor 4 16 Operation 4 2 1 Out of Service When the Liebert Air Economizer is not operating the outside air damper is closed the return air damper is open and the relief air vent fan is shut down This permits air from the conditioned space to be drawn into the primary cooling unit cooled and expelled into the conditioned space The relief air vent is not required while the Liebert Air Economizer is not in service because no air volume is being brought into the conditioned space NOTICE When a non Liebert mixing box and damper motors are used make sure that the following configurations are verified before a unit is placed into service No power to Liebert unit means that there is no power applied to the Liebert Air Econo mizer damper motors Without a spring return motor the dampers will remain in the last
39. t N 3 j the Liebert Air Economizer feature ae A DPN001449 Pg 6 Rev 2 Control Menu Settings The Liebert Air Economizer control uses an outdoor temperature humidity sensor to detect when outdoor conditions are within the operating range The outdoor sensor can be monitored from the Service Economizer data menu on page 2 of 3 see Figure 12 22 Operation 4 3 1 4 4 4 4 1 4 4 2 4 4 3 The Liebert COM control is equipped with a series of setup parameters to allow limited adjustment and monitoring of the Liebert Air Economizer s dampers and sensor To access these parameters from the main unit screen 1 Press the down arrow key until User Menu is displayed 2 From the User Menu screen press the right arrow key to enter the Service Menu 3 Press the Enter key once in the Service Menu and use the arrows to navigate to the ECO icon on the bottom row 4 Once this icon is selected press Enter The parameters for the Liebert Air Economizer are now viewable Liebert Air Economizer Status Screen Parameters SA03 through SA08 of the Liebert Air Economizer screen will show the current status of the Liebert Air Economizer control The Liebert Air Economizer will be activated for use 1f All temperatures and ratios are within the outdoor sensor range The outdoor air is cooler than the indoor return air temperature Whether the Liebert Air Economizer function is available will be shown at parameter SA07 E
40. t flange in the plenum use these as guides to drill screw pilot holes into the top of the unit rear sheet metal blocker 2 Insert sheet metal screws through these flanges into the top of the unit 3 Measure and mark the distance from the front of the electric box top flange in unit back to the center of the plenum frame bottom 1 x 1 tubing approximately 1 1 2 88mm 4 Cover electric box components to prevent metal shavings and debris contamination from the drilling process 5 Drill screw pilot holes from inside the electric box up through the plenum frame 3 6 places depending on length of plenum 6 Insert screws through electric box and plenum tubing to secure the front of the plenum 7 After the units are securely connected remove the safety straps attached in Step 2 in 2 2 Install the Liebert Air Economizer Preliminary Steps 8 Clean up any metal particles and other debris from the installation 9 Reattach the exterior panels to the Liebert Air Economizer Installation Figure 2 Dimensions Liebert Air Economizer and Liebert CW models CW106D 114D Typical unit shown Refer to dimensions and layout for your unit Room Return Air Damper TOP VIEW 118 2996mm Duct Flange 34 122 3099mm 864mm q oy 30 1 16 uct Collar 764mm 2 51 Tni 112 2845mm 25mm x F Eo Plenum 22 o 36 qe 559mm E z 914mm 5mm Outside Air Ka Un 76 pan 1930mm Liebert CW SIDE VIEW Acces
41. ten a subjective procedure and is certainly site dependent In most cases unstable control dampers constantly repositioning is caused by too low of proportional band setting S104 combined with an active supply limit control the supply air temperature is close to or below the low limit S125 A simple improvement may be to decrease the supply limit setpoint S125 If this is not successful feasible desired follow these steps 1 Set Autoset Enable S107 to No 2 Set Control Type S103 to PI 3 Set Supply Limit Temp Value S125 a few degrees higher than the current return air temperature to have it active if S125 is used 4 Set Integration Time S105 to 0 this will enable incrementing only the proportional band 5 Set Temperature Proportional Band S104 to 6 F and observe the response of the controlled dampers Allow the control to stabilize 6 Add 2 F to 104 setting and observe the response of the controlled dampers Allow the control to stabilize 7 Repeat Step 5 until the dampers operate as expected and the temperature is fairly stable on any value of temperature 8 Ifthe actual temperature remains too high above the set point set Integration Time S105 to 4 minutes and observe the response of the controlled dampers Allow the control to stabilize 9 Increase S105 in 1 minute steps until acceptable settings are achieved 10 If the control operation is stable but sluggish the proportional band can be reduced
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