Ec Fans And Plenums; Downflow Units With Ec Fans; Lowering The Ec Fans Into The Floor Stand On Downflow Models - Vertiv Liebert DSE Installer/User Manual

7 EC FANS AND PLENUMS

Depending on the air-distribution options of your unit, you may have EC fans and/or plenums to install.

7.1 Downflow Units with EC Fans

DSE downflow models are equipped with EC fans that may operate in the fully-raised position or lowered
into the floor stand for increased efficiency from reduced air resistance.
WARNING! Risk of very heavy 125-lb (56.7-kg) 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.
CAUTION: Risk of improper handling of heavy and lengthy parts. Can cause personal injury and
equipment damage. Cabinet panels can exceed 5 ft (1.5 m) in length and weigh more than 35 lb
(15.9 kg). Follow relevant OSHA lifting recommendations and consider using a two-person lift
for safe and comfortable removal and installation of cabinet panels. Only properly trained and
qualified personnel wearing appropriate, OSHA-approved PPE should attempt to remove or
install cabinet panels.
NOTE: Use 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.

7.1.1 Lowering the EC Fans into the Floor Stand on Downflow Models

Tools Needed
• 1/2-in. hex socket and wrench
• Factory-supplied jack, crank and jack support
• Cable tie cutter
To lower the fans:
1. Remove the middle and bottom panels from the front of the unit.
2. For ease of fan lowering, We recommend removing the infrared humidifier.
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.
NOTE: The jack should be centered between the first and second set of tabs on the jack support (see
Detail A in Figure 7.1 on the next page).
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