Liebert® Air Economizer™ for Liebert DS™ and Liebert CW™ User Manual
TABLE OF CONTENTS IMPORTANT SAFETY INSTRUCTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . INSIDE FRONT COVER 1.0 PRODUCT DESCRIPTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3 1.1 General Product Information. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 1.1.1 Customer-Supplied Equipment and Ductwork. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
FIGURES Figure 1 Figure 2 Figure 3 Figure 4 Figure 5 Figure 6 Figure 7 Liebert Air Economizer. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 Liebert Air Economizer system diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 Removing bands, packaging . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
IMPORTANT SAFETY INSTRUCTIONS SAVE THESE INSTRUCTIONS 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 Arc flash and electric shock hazard.
NOTE Before any action that could 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. NOTICE Risk of permanently fastening removable front and rear unit panels of the cooling unit and Liebert Air Economizer to each other. Can cause equipment damage and render the front and rear panels not easily removable.
Product Description 1.0 PRODUCT DESCRIPTION 1.1 General Product Information The Liebert Air Economizer is an option for Liebert DS™ downflow units and Liebert CW™ chilled water 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 1.1.1 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 2). Proper installation also requires a customer-provided powered relief-air discharge to rid the structure of the outside air drawn in for cooling.
Product Description 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 ! WARNING Risk of top-heavy unit falling over. Improper handling can cause equipment damage, injury or death.
Product Description 1.4 Unpacking the Liebert Air Economizer ! WARNING Risk of 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. ! 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.
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 Secure the Liebert Air Economizer to the Liebert CW™—CW026-114 The Liebert 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 Risk of permanently fastening removable front and rear unit panels of the cooling unit and Liebert Air Economizer to each other. Can cause equipment damage and render the front and rear panels not easily removable.
Installation Figure 4 Dimensions—Liebert Air Economizer and Liebert CW™ models CW026D-CW084D Room Return Air Damper 1" (25mm) TOP VIEW 30-1/16" (764mm) Plenum Duct Flange: A B 36" (914mm) C 1" (25mm) Duct Collar 34" (864mm) 1" (25mm) Access Panel for 2" Pre-Filter 2" (51mm) 72" (1828mm) 22" (559mm) Outside Air Damper 79" (2007mm) Liebert CW SIDE VIEW BACK VIEW FRONT VIEW (Reference only) Table 1 DPN001411 Rev.
Installation 2.2.3 Attach the Liebert Air Economizer to a Liebert CW146/181 or Liebert DS028-105 The Liebert CW™—CW146/181 and Liebert DS™ 028-105 have no flanges on top. Position the Liebert Air Economizer on top of either cooling unit 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 6 Dimensions—Liebert Air Economizer and Liebert CW™ models CW146/181 Room Return Air Damper Front of Unit 120" (3048mm) Duct Flange 122" (3098mm) TOP VIEW 118" (2997mm) 2" (51mm) 57" (1448mm) Duct Opening 23" (584mm) Duct Opening 57" (1448mm) Duct Opening 7/8" (22mm) Duct Collar 45" (1143mm) 42" (1067mm) Duct Flange 1" (25mm) Plenum 40" (1016mm) Filter Plenum 2" (51mm) Outside Air Damper 94" (2388mm) 18" (457mm) Liebert CW SIDE VIEW REAR VIEW Access Panel for 2" Pre-F
Installation Figure 7 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 Arc flash and electric shock hazard. Open all local and remote electric power disconnect switches, verify with a voltmeter that power is Off and wear personal protective equipment per NFPA 70E before working within the electric control enclosure. Failure to comply can cause serious injury or death. The Liebert Air Economizer must be connected by a licensed and qualified electrician only.
Installation Figure 8 Damper wiring connections—Liebert CW™—CW026-CW084 units Outdoor Air Damper Return Air T/H Sensor Return Air Damper Route cables through holes in top of electric box and into bottom of Economizer Outdoor Air T/H Sensor (Identified With Outdoor Label) Field-Supplied Outdoor Air Duct 2" Pre-Filters A Liebert Control Board Front View Return Air Damper Motor Connection (Top Motor) Provide strain relief using cable tie anchors as shown.
Installation Figure 9 Damper wiring connections—Liebert CW™—CW106 / CW114 units Outdoor Air Damper Return Air T/H Sensor Return Air Damper Outdoor Air T/H Sensor (Identified With Outdoor Label) Field-Supplied Outdoor Air Duct A Route cables through holes in top of electric box and into bottom of Economizer 120" Frame, Chilled Water Control Board Front View Provide strain relief using cable tie anchors as shown.
Installation Figure 10 Damper wiring connections—Liebert DS™ units Outdoor Air T/H Sensor (Identified With Outdoor Label) Return Air T/H Sensor Return Air Damper Outdoor Air Damper Field-Supplied Outdoor Air Duct 2" Pre-Filters Route cables through holes in top of electric box and into bottom of Economizer A Liebert Control Board Front View Provide strain relief using cable tie anchors as shown.
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 thermistor (factory-connected to the main interface board) These must be installed and connected to the primary cooling unit.
Installation Figure 12 Supply thermistor wiring and restricted airflow switch location Locations for Liebert DS™ and Liebert CW™ units shown. Note location for your unit. Restricted Airflow Switch Location for Liebert CW106-181 Restricted Airflow Switch Location for Liebert DS + CW026-CW084 P13 FactoryConnected E P13 FactoryConnected Uncoil and Extend Cable Through Holes Provided in Bottom of Unit ge w-volta sible lo own. s o p sh Both rtments lies.
Installation 2.4 Adjust the Restricted Airflow Switch on the Liebert Air Economizer 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. 2. 3. 4. 5. 6. 7. 8. 9. 10. 11. 12. 13. 14. 15. Inspect all connections, restore power to operate the unit’s blower. Go to the Service Menus, Diagnostic / Service Mode. Enter the Service Menu password 5010. Enable manual mode on line S313.
Installation Checklist 3.0 INSTALLATION CHECKLIST ___ 1. ___ 2. ___ 3. ___ 4. ___ 5. ___ 6. ___ 7. ___ 8. ___ 9. ___ 10. ___ 11. ___ 12. ___ 13. ___ 14. ___ 15. ___ 16. 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.
Operation 4.0 OPERATION Liebert cooling units control the Liebert Air Economizer using the Liebert iCOM®. For more information on staging the Liebert Air Economizer, refer to the Liebert Air Economizer operation portion of the Liebert iCOM user manual, SL-18835 available at the Liebert Web site: www.Liebert.
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 Unit is not operating the Liebert Air Economizer when it should.
Troubleshooting Table 3 Liebert Air Economizer troubleshooting (continued) Problem Possible Cause Remedy The room is over pressurized when air economizer demand is high. Room pressure relief vent not adequately sized. See design engineer for further assistance. The fan is not ramping according to deviation from the fan temperature setpoint. The fan speed is increasing with the call for the Liebert Air Economizer. Consider disabling S16B of Service Menus> Setpoints.
Troubleshooting Notes Liebert® Air EconoMizer™ 25
Troubleshooting 26 Liebert® Air EconoMizer™
Technical Support / Service Web Site www.liebert.com Monitoring liebert.monitoring@emerson.com 800-222-5877 Outside North America: +00800 1155 4499 Single-Phase UPS & Server Cabinets liebert.upstech@emerson.
