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SRX4300 Cooling System Maintenance

Maintaining the SRX4300 includes removing and installing the fans.

The SRX4300 has six independent, field-replaceable fans at the rear of the chassis.

Each fan module is a hot-removable and hot-insertable field-replaceable unit (FRU). You can remove and replace the fans without turning off power to the appliance or disrupting its functions.

Note:

The time within which you must replace a failed fan module depends on the ambient temperature. Check the temperature using the value of the CB 0 TMP75 Inlet Right sensor in the show chassis environment command output.

If the temperature is up to 104°F (40°C), you must replace the fan module within 2 minutes. If the temperature is greater than 104°F (40°C), you must replace the fan module within 40 seconds.

Before you replace a fan:

  • Ensure that you understand how to prevent ESD damage.

  • Ensure that you have the following parts and tools:

    • Electrostatic discharge (ESD) grounding strap

    • An antistatic bag or an antistatic mat

    • A replacement fan module

    • A Phillips (+) screwdriver, number 1 or 2 (optional), for the captive screws

Remove the Fan Module from the SRX4300

CAUTION:

Do not remove a fan unless you have a replacement fan available.

To remove a fan:

  1. Wrap and fasten one end of the ESD grounding strap around your bare wrist, and connect the other end of the strap to one of the ESD points on the chassis.
  2. Place the antistatic bag or the antistatic mat on a flat, stable surface.
  3. Loosen the captive screws on the front faceplate of the fan module by using your fingers. If you can't loosen the captive screws by using your fingers, use 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.
  4. Grasp the handle on the fan module and pull it firmly to slide the fan module out of the chassis.
    Figure 1: Remove the Fan Module from the SRX4300 Remove the Fan Module from the SRX4300
  5. Place the fan module in the antistatic bag or on the antistatic mat.

Install the Fan Module in the SRX4300

To install a fan:

  1. Wrap and fasten one end of the ESD grounding strap around your bare wrist, and connect the other end of the strap to one of the ESD points 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 the module in until it is fully seated.
    Figure 2: Install the Fan Module in the SRX4300 Install the Fan Module in the SRX4300
  4. Tighten the captive screws on the faceplate of the fan module by using your fingers. If you can't tighten the captive screws by using your fingers, use the screwdriver.