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Maintaining the SRX5800 Cooling System

Maintaining the Fan Trays on the SRX5800 Firewall

Purpose

For optimum cooling, verify the condition of the fans.

Action

  • Monitor the status of the fans. A fan tray contains multiple fans that work in unison to cool the firewall components. If one fan fails, the host subsystem adjusts the speed of the remaining fans to maintain proper cooling. A major alarm is triggered when a fan fails, and a minor alarm and major alarm is triggered when a fan tray is removed.

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

    Note:

    In the Junos OS command-line interface (CLI):

    • The show chassis environment command output displays the fan trays as Upper Fan Tray and Bottom Fan Tray.

    • The show chassis hardware command output displays the fan trays as Fan Tray 0 for the upper fan tray and Fan Tray 1 for the bottom fan tray.

Note:

The fan numbers are stamped into the fan tray sheet metal next to each fan.

Replacing an SRX5800 Firewall Fan Tray

The fan trays are hot-insertable and hot-removable. To replace a fan tray, perform the following procedures in sequence:

Removing an SRX5800 Firewall Fan Tray

Before you begin to remove the fan tray:

Ensure that you have the following available:

  • ESD grounding strap

  • Phillips (+) number 2 screwdriver

Note:

To prevent overheating, install the replacement fan tray immediately after removing the existing fan tray. Do not operate the firewall for more than two minutes without both fan trays installed.

To remove the upper or bottom fan tray (see Figure 1 and Figure 2):

  1. Attach an ESD grounding strap to your bare wrist, and connect the strap to one of the ESD points on the chassis.
  2. Reposition the cable manager before removing the bottom front fan tray:
    1. Unwrap any cables on the cable manager and remove the cables from the tray. Arrange the cables so that they do not block the front of the cable manager and tray, and secure them with temporary fasteners so that they are not supporting their own weight as they hang from the connector.
    2. Simultaneously pull the two releases labeled PULL on the cable manager. Lift it up and outward to lock it in place.
  3. Using the Phillips (+) number 2 screwdriver loosen the captive screw on each side of the fan tray faceplate.
  4. Grasp both sides of the fan tray and pull it out approximately 1 to 3 inches.
    Warning:

    To prevent injury, keep tools and your fingers away from the fans as you slide the fan module out of the device. The fans might still be spinning.

  5. Pause for approximately 15 seconds to allow the fans to stop spinning.
  6. When the fans stop spinning, press on the two latches located on the inside of the fan tray.
  7. Place one hand under the fan tray to support it and pull the fan tray completely out of the chassis.
  8. Proceed to Installing an SRX5800 Firewall Fan Tray to install the replacement fan tray.
Figure 1: Removing an Upper Fan Tray (Standard-Capacity Shown, High-Capacity Similar) Removing an Upper Fan Tray (Standard-Capacity Shown, High-Capacity Similar)
Figure 2: Removing the Bottom Fan Tray (Standard-Capacity Shown, High-Capacity Similar) Removing the Bottom Fan Tray (Standard-Capacity Shown, High-Capacity Similar)

Installing an SRX5800 Firewall Fan Tray

Before you begin to install the fan tray:

Ensure that you have the following available:

  • ESD grounding strap

  • Phillips (+) number 2 screwdriver

Note:

To prevent overheating, install the replacement fan tray immediately after removing the existing fan tray. Do not operate the firewall for more than two minutes without both fan trays installed.

To install a fan tray (see Figure 3 and Figure 4):

  1. Attach an ESD grounding strap to your bare wrist, and connect the strap to one of the ESD points on the chassis.
  2. Grasp the fan tray on each side and insert it straight into the chassis. Note the correct orientation by the "this side up" label on the top surface of the fan tray.
  3. Using the Phillips (+) number 2 screwdriver tighten the captive screws on each side of the fan tray faceplate to secure it in the chassis.
  4. Lower the cable manager back into position, if necessary.
Figure 3: Installing an Upper Fan Tray (Standard-Capacity Shown, High-Capacity Similar)Installing an Upper Fan Tray (Standard-Capacity Shown, High-Capacity Similar)
Figure 4: Installing the Bottom Fan Tray (Standard-Capacity Shown, High-Capacity Similar)Installing the Bottom Fan Tray (Standard-Capacity Shown, High-Capacity Similar)

Maintaining the Air Filter on the SRX5800 Firewall

Purpose

For optimum cooling, verify the condition of the air filters.

Action

  • Regularly inspect the air filter. A dirty air filter restricts airflow in the unit, impeding the ventilation of the chassis. The filter degrades over time. Periodically replace the filter in use, as well as spares. We recommend that you replace the filter every six months. Discard used filters, do not attempt to clean and reuse them.

    Note:

    Air filters will not be replaced by Juniper Networks under the Juniper Networks Hardware Replacement Support Plan, you need to purchase them for replacement.

    CAUTION:

    Always keep the air filter in place while the firewall is operating. Because the fans are very powerful, they could pull small bits of wire or other materials into the firewall through the unfiltered air intake. This could damage the firewall components.

  • The shelf life of polyurethane filter varies from two years to five years depending on the storage conditions. Store in a cool, dry, and dark environment. Wrap the media in plastic and store in an environment with relative humidity between 40%- 80% and temperature between 40°F (4° C) to 90°F (32° C). Note that if the material flakes, or becomes brittle when rubbed or deformed, it is no longer usable.

Replacing the SRX5800 Firewall Air Filter

You should change the air filter every six months. To replace the air filter, perform the following procedures in sequence:

Removing the SRX5800 Firewall Air Filter

Before you begin to remove the air filter:

Ensure that you have the following available:

  • ESD grounding strap

CAUTION:

Do not run the firewall for more than two minutes without the air filter in place.

CAUTION:

Always keep the air filter in place while the firewall is operating, except during replacement. Because the fans are very powerful, they could pull small bits of wire or other materials into the firewall through the unfiltered air intake. This could damage the firewall components.

To remove the air filter (see Figure 5):

  1. Attach an ESD grounding strap to your bare wrist, and connect the strap to one of the ESD points on the chassis.
  2. Unwrap any cables on the cable manager and remove the cables from the tray. Arrange the cables so that they do not block the front of the cable manager and tray, and secure them with temporary fasteners so that they are not supporting their own weight as they hang from the connector.
    CAUTION:

    Do not let fiber-optic cables hang free from the connector. Do not allow the fastened loops of a cable to dangle, which stresses the cable at the fastening point.

  3. Simultaneously pull the two releases labeled PULL on the cable manager. Lift it up and outward to lock it in place to access the air filter.
  4. Slide the air filter tray out of the chassis.
  5. Lift the air filter out of the air filter tray.
Figure 5: Removing the Air Filter (Standard-Capacity Filter Tray Shown, High-Capacity Similar)Removing the Air Filter (Standard-Capacity Filter Tray Shown, High-Capacity Similar)

Installing the SRX5800 Firewall Air Filter

Before you begin to install the air filter:

Ensure that you have the following available:

  • ESD grounding strap

You should change the air filter every six months.

To install the air filter (see Figure 6):

  1. Attach an ESD grounding strap to your bare wrist, and connect the strap to one of the ESD points on the chassis.
  2. Ensure the air filter is right side up.
  3. Place the air filter into the air filter tray.
  4. Insert the air filter tray into the chassis by sliding it straight into the chassis until it stops.
  5. Lower the cable manager back into position.
  6. Rearrange the cables in the cable manager.
Figure 6: Installing the Air Filter Standard-Capacity Filter Tray Shown, High-Capacity Similar)Installing the Air Filter Standard-Capacity Filter Tray Shown, High-Capacity Similar)