Precision Cooling For Business-Critical Continuity™ Liebert® Air Economizer™ for Liebert DS™, Liebert CW™ & Liebert Challenger™ 3000 User Manual
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 utility power. Follow all local and national codes. ! 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.
TABLE OF CONTENTS GENERAL SAFETY GUIDELINES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . INSIDE FRONT COVER 1.0 PRODUCT DESCRIPTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1 1.1 General Product Information. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 1.1.1 Customer-Supplied Equipment and Ductwork. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
FIGURES 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 Liebert Air Economizer arrangement, typical. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 Dimensions—Liebert Air Economizer and Liebert CW models CW106D/114D . . . . . . . . . . . . . . . 6 Dimensions—Liebert Air Economizer and Liebert CW models CW026D-CW084D . . . . . . . . . . . .
Product Description 1.0 PRODUCT DESCRIPTION 1.1 General Product Information The Liebert Air Economizer 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.
Product Description Figure 1 Liebert Air Economizer arrangement, typical Return Air Sensors (Field-installed above damper) Plenum Powered Outdoor Relief Opening (by others) Room Return Air Relief Air Size collar according to cooling unit opening Room Relief Air Discharge (sized and provided by others) Outdoor Air Sensor (Field-installed inside duct; labeled “Outdoor” Sensor) Filter (by others) Outside Air Entry Outside Opening with Louvers, Screen and Bars to prevent precipitation, vermin and human
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 distance that will fit under the skid.
Installation 2.0 INSTALLATION Install the Liebert Air Economizer in accordance with the instructions in this manual and site specific documentation. ! 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.
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. ! WARNING Risk of heavy unit falling. Can cause equipment damage, personal injury or death.
Installation Figure 2 Dimensions—Liebert Air Economizer and Liebert CW models CW106D/114D Typical unit shown. Refer to dimensions and layout for your unit.
Installation Figure 3 Dimensions—Liebert Air Economizer and Liebert CW models CW026D-CW084D Room Return Air Damper TOP VIEW Duct Flange: A B 2" (51mm) 1" (25mm) C 1" (25mm) Duct Collar 34" (864mm) 30-1/16" (764mm) Plenum 36" (914mm) 22" (559mm) 1" (25mm) Access Panel for 2" Pre-Filter Outside Air Damper 79" (2007mm) 72" (1828mm) SIDE VIEW BACK VIEW DPN001411 Rev.
Installation Figure 4 Dimensions—Liebert Air Economizer and Liebert DS downflow units, 28-105kW (8-30 tons) Room Return Air Damper TOP VIEW "A" Duct Flange "B" 2-1/8" (54mm) 34" (864mm) 1" 25mm Duct Collar 1" (25mm) "C" 30-1/16" (764mm) Plenum 36" (914mm) "D" 1" (25mm) Outside Air Damper 76" (1930mm) "E" BACK VIEW Liebert DS Unit SIDE VIEW Access Panel for 2" Pre-Filter & 4" Unit Filters 14" (356mm) DPN001412 Rev.
Installation 2.3 Wiring the Liebert Air Economizer ! 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.
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: 1.
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.
Installation Figure 7 Supply limit thermistor wiring and restricted airflow switch location Locations for Liebert DS and Liebert CW units shown. Note location for your unit. 120" Frame, Chilled Water Restricted Airflow Switch Location Liebert DS + CW026-CW084 Restricted Airflow Switch Location P13 FactoryConnected E P13 FactoryConnected Uncoil and Extend Cable Through Holes Provided in Bottom of Unit voltage le low- n. ib s s o s ho w Both p lies. rtments compa e which app in Determ FRONT VIEW 2.
Installation Checklist 3.0 INSTALLATION CHECKLIST ___ 1. ___ 2. ___ 3. ___ 4. ___ 5. ___ 6. ___ 7. ___ 8. 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.
Operation 4.0 OPERATION Liebert cooling units control the Liebert Air Economizer with the analog outputs of the Liebert iCOM control. The Liebert iCOM can be used with a Liebert Air Economizer or with a previously installed Liebert Air Economizer equipped with 0-10VDC or 2-10VDC dampers. The Liebert iCOM 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.
Operation 4.1 Operational Condition 4.1.1 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%.
Operation Figure 9 Air flow pattern of a Liebert Air Economizer system Outdoor Temperature /Humidity Sensor Outdoor Damper Roof Indoor Temperature /Humidity Sensor Indoor Damper Return Room Ceiling Mixing Box Pressure Relief CRAC Equipment Rack Hot Aisle Equipment Rack Cold Aisle Hot Aisle Supply Sensor 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.
Operation Figure 10 Liebert DS setpoints screen, page 4 of 6 UNIT 01 SETPOINTS (pg 4 of 6) S134 S135 S136 S137 S138 S139 S140 S141 S142 S143 S144 PASSWORD (Actual Level 0) DT between Room / Outdoor Type DT between Room Air / Outdoor DT between Room / FC Type DT between Room Air FC Fluid Minimum CW Temp Minimum CW Temp Value Lockout FC at FC Fluid below Transition Change ???? Disable °F Disable °F Disable °F 48°F 100 .
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.
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).
Operation Figure 13 Damper settings and limits screen UNIT 01 Economizer (page 3 of 3) SA23 PASSWORD (Actual Level 3) SA24 Return Damper Open SA25 Return Damper Closed SA26 Return Damper Minimum Limit At SA27 Outdoor Damper Open SA28 Outdoor Damper Closed SA29 Outdoor Damper Position SA30 Return Damper Position SA31 SA32 SA33 and for next/previous unit to change parameter then ???? 2.0V 10.0V 15% 10.0V 2.
Operation 4.2.2 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).
Operation The Liebert iCOM 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.
Operation 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%. 4.4.
Operation Figure 15 Liebert iCOM Wellness menu, page 9 WELLNESS economizer settings (page 9 of 9) SA89 PASSWORD (Actual Level 3) SA90 Number of Repositions SA91 Run Hours SA92 Repositions per Hour SA93 Reposition Counter Reset SA94 SA95 SA96 SA97 SA98 SA99 and for next/previous unit then to change parameter UNIT 01 ???? 0020 21hrs 1 No to select parameter to confirm Refer to the Liebert iCOM user manual for additional information. The manual, SL-18835, is available at the Liebert Web site: www.
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 ducting 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.
Troubleshooting 6.0 TROUBLESHOOTING Table 3 Liebert Air Economizer troubleshooting Problem Reduced Airflow High/Low Temp High/Low Humidity Moisture enters unit Contaminants or particulates enter conditioned space Pollen, objectionable or noxious odors or gases enter conditioned space Air damper—outside or room return—does not open or does not close No damper function or signals to damper Possible Cause Remedy Blocked filter Replace or clean filter. Improper duct size Enlarge duct.
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