Emerson Liebert Economizer Solutions User Manual

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.

1. Locate the holes in the rear filter support 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" (38mm).

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.

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.