Replacement Instructions for the Main Fan HP Modular Cooling System

About this document
This document describes the procedure for replacing the fan
unit of an HP Modular Cooling System (MCS).
Customers who order a replacement fan unit are supplied with
a kit that contains the spare fan unit. To replace the original
fan unit, remove it from the MCS unit and replace it with the
new fan unit as described in the following instructions.
HP Modular Cooling System Spare
Replacement video
Because of the difficulty of removing and replacing spare
parts, HP recommends watching the HP Modular Cooling
System Spare Replacement video. You can access the video on
the HP website
http://www.hp.com
or on the Documentation CD, which is included with your
original HP Modular Cooling System. This video provides
further explanation and detail of replacement strategies and
techniques that might be helpful when attempting to remove
and replace spare parts.
Before you begin
The fan unit can be removed and replaced during real-time
operation.
CAUTION: To reduce the risk of the servers overheat-
ing, open all of the rack doors of each rack attached
to the MCS unit while completing the following
procedures to increase air flow within the rack.
Required tools
To complete the following steps, you will need a
T-25 Torx driver.
1 Removing the fan unit
1. Open the rear MCS door.
NOTE: The number of horizontal brackets varies
depending on the position of the fan unit (top, middle,
or bottom).
2. Using a T-25 Torx driver, remove the four Torx screws
securing the horizontal shipping bracket to the MCS frame.
3. Loosen the two thumbscrews on the bottom of the fan unit.
February 2006 (First Edition)
Part Number 403352-001
Replacement Instructions for
the Main Fan
HP Modular Cooling System
Important safety information
CAUTION: The fan unit weighs 16.8 kg (37 lb). Use
extra caution when removing and replacing the top
fan unit because it might be higher than your
shoulders and is heavy and awkward to lift.
4. Pull the fan unit out toward you, and remove it from the
MCS unit.
To replace this component, see "Replacing the fan unit."
2 Replacing the fan unit
1. Align the fan unit to the sliding rails.
CAUTION: The fan unit weighs 16.8 kg (37 lb). Use
extra caution when removing and replacing the top
fan unit because it might be higher than your shoul-
ders and is heavy and awkward to lift.
2. Slide the fan unit onto the sliding rails inside the MCS unit.