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SRX4700 Cooling System Maintenance

Maintaining the SRX4700 includes removing and installing the fan modules.

The SRX4700 has six independent, hot-removable and hot-insertable field-replaceable fan modules at the rear of the chassis.

For optimum cooling, verify the condition of the fan modules.

  • Monitor the status of the fan modules. All the fan modules work in unison to cool the firewall. If one fan module fails, the redundant fan module acts as a backup. A major alarm is triggered when a fan fails, and a minor alarm and major alarm is triggered when a fan module is removed. We recommend that you replace the fan module immediately to maintain proper cooling.

  • To display the status of the cooling system, issue the show chassis environment command.

You can remove and replace the fan modules without powering off the firewall or disrupting firewall functions.

Before you replace a fan module:

  • Ensure that you understand how to prevent electrostatic discharge (ESD) damage.

  • Ensure that you have the following parts and tools:

    • An ESD grounding strap

    • An antistatic bag or an antistatic mat

    • A replacement fan module

    • (Optional) A Phillips (+) screwdriver, Number 1 or Number 2, for loosening or tightening the screws.

You must replace the Fan modules within the duration mentioned in Table 1.

Table 1: Replacement Duration for the Fan Module
Chassis Ambient Temperature Duration
27 °C 5 minutes
35 °C 3 minutes
40 °C 2 minutes

Remove the Fan Module from the SRX4700

CAUTION:

Do not remove a fan unless a replacement fan is available.

To remove a fan module:

  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 screw on the front faceplate of the fan module by using the screwdriver.
    Warning:

    To prevent injury, do not touch the fan module with your hands or any tools when you slide the fan module out of the chassis—the fan module might still be running.
  4. Grasp the handle on the fan module and pull it firmly to slide the it out of the chassis.
  5. Place the fan module in the antistatic bag or on the antistatic mat.

Install the Fan Module in the SRX4700

To install a fan module:

  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 firewall and slide the module in until it is fully seated.
  4. Tighten the screw on the faceplate of the fan module by using screw driver.