Emerson Liebert DS Precision Cooling System 28-105kW Manuel D’Utilisation

Install the Liebert Air Economizer in accordance with the instructions in this manual and site specific 

documentation.

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.

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.
3. Attach the lifting method or mechanism to the Liebert Air Economizer.
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 - 

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.

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.

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.

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 bars may be 

required with some lifting or securing methods to prevent damaging the Liebert Air 

Economizer.