Replacement Instructions for the Water Temperature Sensor HP Modular Cooling System

WARNING: To reduce the risk of electric shock or
dama
g
e to the equipment, use extreme caution when
removing and replacing components that involve
water around the electrical wires and unsecured
power inlet box. There is great risk of electrical
shock when water is used near electricity.
CAUTION: To reduce the risk of the servers
overheating, 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.
Powering down the MCS unit
1. Open the front MCS door.
2. Turn off the AC1 and AC2 breakers on the AC
transfer switch.
3. Open the rear MCS door.
WARNING: To reduce the risk of electric shock or
damage to the equipment:
• Do not disable the power cord grounding plug.
The grounding plug is an important safety
feature.
• Plug the power cord into a grounded (earthed)
electrical outlet that is easily accessible at all
times.
• Unplug the power cord from the power supply to
disconnect power to the equipment.
• Do not route the power cord where it can be
walked on or pinched by items placed against it.
Pay particular attention to the plug, electrical
outlet, and the point where the cord extends from
the storage system.
4. Disconnect the two AC power cables from the power
connectors, labeled Primary and Secondary, on the
power inlet box.
5. Disconnect the network cable from the RJ-45 connector
on the power inlet box.
Shutting off the water
1. Shut off the water flowing into the MCS unit at the
facility-side shut-off valve.
2. Confirm that no water is flowing into the MCS unit.
Required tools
To complete the following steps, you will need:
• T-25 Torx driver
• Phillips screwdriver
• Small Flathead screwdriver
• (2) 18-mm wrench
• Wire cutters
Removing the bottom fan unit
1. Open the rear MCS door.
2. Using a T-25 Torx driver, remove the four Torx screws
securing the horizontal shipping bracket to the
MCS frame.