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Maintain the QFX5120 Cooling System

 

Remove a Fan Module from a QFX5120 Switch

The fan module in QFX5120 switches 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 remove a fan module in from the switch, ensure that you have the following parts and tools available:

  • Number 2 Phillips (+) screwdriver—not provided

  • An antistatic bag or an antistatic mat—not provided

  • A replacement fan module

Figure 1 shows how to remove a fan module from a QFX5120-32C switch. Figure 2 shows how to remove a fan module from a QFX5120-48Y or QFX5120-48T switch.

  1. Place the antistatic bag or the antistatic mat on a flat, stable surface.
  2. Loosen the captive screws on the front faceplate of the fan module by using the screwdriver.Warning

    To prevent 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 pull it firmly to slide the fan module out of the chassis.
    Figure 1: Remove a Fan Module from a QFX5120-32C Switch
    Remove a Fan Module
from a QFX5120-32C Switch
    Figure 2: Remove a Fan Module from a QFX5120-48Y or QFX5120-48T Switch
    Remove a Fan
Module from a QFX5120-48Y or QFX5120-48T Switch
  4. Place the fan module in the antistatic bag or on the antistatic mat placed on a flat, stable surface.Note

    You must install all the fan modules and they must be operational for optimal functioning of the switch.

    Caution

    Do not mix:

    • Fan modules with different airflow directions in the same chassis.

    • Fan modules and power supplies with different airflow directions in the same chassis.

  5. Install the replacement fan.

Install a Fan Module in a QFX5120 Switch

We ship QFX5120-32C switches with 5+1 redundant fans preinstalled in the rear panel. We ship QFX5120-48Y and QFX5120-48T switches with 4+1 redundant fans preinstalled in the rear panel. 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.

Caution

Do not mix:

  • Fan modules with different airflow directions in the same chassis.

  • Power supplies with different airflow directions in the same chassis.

  • Fan modules and power supplies with different airflow directions in the same chassis.

  • 650-W and 850-W power supplies in the same QFX5120-48T chassis.

Before you install a fan module in the switch:

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

  • Ensure that you have the following parts and tools available:

    • ESD grounding strap—not provided

    • Number 2 Phillips (+) screwdriver—not provided

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.

  1. Ensure that you have the correct fan module.

    If you are installing a fan module with the label F2B in a QFX5120-32C switch, verify that the color of the handle of the power supply installed is red. If you are installing a fan module with the label B2F in a QFX5120-32C switch, verify that the of the handle of the power supply installed is blue.

    If you are installing a fan module with the label AIR OUT in a QFX5120-48Y or QFX5120-48T switch, verify that the color of the handle of the power supply installed is Juniper Gold. If you are installing a fan module with the label AIR IN in a QFX5120-48Y or QFX5120-48T switch, verify that the of the handle of the power supply installed is Juniper Azure Blue.

  2. Wrap and fasten one end of the ESD wrist strap around your bare wrist, and connect the other end of the strap to the ESD point on the switch.
  3. Remove the fan module from its bag.
  4. 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 and latched.
  5. Tighten the captive screws on the faceplate of the fan module by using the screwdriver. The recommended torque value is 4.34 lb-in. (0.49 Nm).
Figure 3: Install a Fan Module in a QFX5120-32C Switch
Install
a Fan Module in a QFX5120-32C Switch
Figure 4: Install a Fan Module in a QFX5120-48Y or QFX5120-48T Switch
Install
a Fan Module in a QFX5120-48Y or QFX5120-48T Switch