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Maintaining the EX4550 Cooling System

 

Removing a Fan Module from an EX4550 Switch

The fan module is a hot-removable and hot-insertable field-replaceable unit (FRU) installed in the rear panel of the switch: You can remove and replace it without powering off the switch or disrupting switch functions.

Ensure that you have the following parts and tools available:

  • Phillips (+) screwdriver, number 2

  • An antistatic bag or an antistatic mat

  • A replacement fan module

To remove a fan module from the switch (see Figure 1):

  1. Place the antistatic bag or the antistatic mat on a flat, stable surface.
  2. Loosen the screw securing the fan module by using the screwdriver.Warning

    To avoid injury, do not touch the fan with your hands or any tools as you slide the fan module out of the chassis—the fan might still be running.

  3. Grasp the handle on the fan module and compress the release clip on both sides of the handle firmly to release the fan.
  4. Pull the handle firmly to slide the fan module out of the chassis.
  5. Place the fan module in the antistatic bag or on the antistatic mat placed on a flat, stable surface.
  6. Install the replacement fan.
Figure 1: Removing a Fan Module from an EX4550 Switch
Removing
a Fan Module from an EX4550 Switch
Note

All three fan modules must be installed and operational for optimal functioning of the switch.

Installing a Fan Module in an EX4550 Switch

Each fan module is a hot-removable and hot-insertable field-replaceable unit (FRU) installed in the rear panel of the switch: You can remove and replace it without powering off the switch or disrupting switch functions.

Before you install a fan module in the switch:

  • Ensure you understand how to prevent electrostatic discharge (ESD) damage. See Prevention of Electrostatic Discharge Damage.

  • Ensure that you have the correct fan module. The label AIR IN (AFI) or AIR OUT (AFO) on the fan module must match the label AFI or AFO on the installed power supply.

Ensure that you have the following parts and tools available to install a fan module in the switch chassis:

  • ESD grounding strap

  • Phillips (+) screwdriver, number 2

To install a fan module in the switch (see Figure 2):

  1. Attach the ESD grounding strap to your bare wrist, and connect the strap to the ESD point on the chassis.
  2. Remove the fan module from its bag.
  3. Hold the handle of the fan module with one hand and support the weight of the module with the other hand. Place the fan module in the fan module slot on the rear panel of the switch and slide it in until it is fully seated.
  4. Tighten the screw on the fan module by using the screwdriver.
Figure 2: Installing a Fan Module in an EX4550 Switch
Installing a Fan Module
in an EX4550 Switch
Note

If you have a Juniper J-Care service contract, register any addition, change, or upgrade of hardware components at https://www.juniper.net/customers/support/tools/updateinstallbase/ . Failure to do so can result in significant delays if you need replacement parts. This note does not apply if you replace existing components with the same type of component.