User manual

EC Fans—Lowering and Removing
Liebert
®
DS
™
44
6.0 EC FANS—LOWERING AND REMOVING
Liebert DS downflow models DS053, DS070, DS077 and DS105 can be equipped with EC fans that
can be operated either in their fully raised position or lowered into the floor stand for increased
efficiency from reduced air resistance.
The fans are also removable, easing maintenance and replacement.
6.1 Lowering the EC Fans into the Floor Stand
Tools Needed
• 1/2" hex socket & wrench
• Factory-supplied jack, crank and jack support
• cable tie cutter
1. Remove the middle and bottom panels from the front of the unit.
2. For ease of fan lowering, Emerson recommends removing the infrared humidifier using the
approved infrared humidifier removal procedure.
3. Position the factory-supplied jack and jack support under the fan to be lowered.
4. Raise the jack to safely support the fan before removing any hardware.
5. Cut and remove the cable tie that retains the wiring loop to the blower mounting plate. All other
cable ties that route the fan wiring should remain intact.
6. Remove the six 1/2" hex head screws. Retain the hardware for later use.
!
WARNING
Risk of electric shock and high speed rotating fan blades. Can cause injury or death.
Disconnect all local and remote electric power supplies and verify that fan blades have
stopped rotating before working within.
!
WARNING
Risk of very heavy fan modules dropping downward suddenly. Can cause injury or death.
Support fan modules before removing mounting hardware.
Use caution to keep body parts out of the fan modules pathway during repositioning.
Only properly trained and qualified personnel should work on this equipment.
Fan modules weigh in excess of 100 lb. (45.4kg) each.
NOTE
The Liebert DS unit should be used with the fans either in their original raised position or with
the fans in their fully lowered position. Suspension of fans in an intermediate position will
directly affect product performance and is not recommended.
NOTE
A properly positioned jack will be centered between the first and second set of tabs on the jack
support. The jack will be biased towards the front of the unit.