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Maintaining the EX9253 Cooling System

 

Removing a Fan Tray from an EX9253 Switch

The fan trays are hot-removable and hot-insertable field-replaceable units installed in the rear panel of the switch. You can replace them without powering off the switch or disrupting switch functions.

Caution

You must replace the fan tray within two minutes of removing the fan tray to prevent the chassis from overheating.

Before you begin to remove a fan tray:

Ensure that you have the following parts and tools available:

  • An ESD wrist strap

  • A Phillips (+)  screwdriver, number  2 (not provided)

  • A replacement fan tray

To remove a fan tray from an EX9253 switch chassis (see Figure 1):

  1. 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.
  2. Loosen the screw on the fan tray faceplate using the Phillips  (+)  screwdriver, number  2.Warning

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

  3. Hold and lift the latch located on the inside of the fan tray to release it from the chassis.
  4. Grasp the fan tray and pull it out approximately 1 to 3  inches.
  5. Place one hand under the fan tray to support it, and pull the fan tray completely out of the chassis.
    Figure 1: Removing a Fan Tray
    Removing a Fan Tray

Installing a Fan Tray in an EX9253 Switch

The fan trays are hot-removable and hot-insertable field-replaceable units installed in the rear panel of the switch. You can replace them without powering off the switch or disrupting switch functions.

Caution

You must replace the fan tray within two minutes of removing the fan tray to prevent the chassis from overheating.

Before you begin to install a fan tray:

Ensure that you have the following parts and tools available:

  • An ESD wrist strap

  • A Phillips (+)  screwdriver, number  2 (not provided)

To install a fan tray in an EX9253 switch (see Figure 2):

  1. 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.
  2. Grasp the fan tray and place one hand under the fan tray for support.
  3. Place the fan tray on the respective slot, and carefully push the fan tray into the chassis until the socket lock snaps into place and holds it.
  4. Tighten the screw on the fan tray faceplate using the Phillips (+)  screwdriver, number  2 to secure the fan tray in the chassis.
    Figure 2: Installing a Fan Tray
    Installing a Fan Tray
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.

Maintaining the Fan Tray in EX9253 Switches

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 switch components. If one fan fails, the speed of the remaining fans is adjusted to maintain proper cooling. A major alarm is triggered when a fan fails and a minor alarm and a major alarm are triggered when a fan tray is removed.

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

    user@switch> show chassis environment

Removing the Air Filter Unit from an EX9253 Switch

The air filter unit consists of three parts–the outer filter cover, the air filter, and the inner cage. The air filter sits between the outer cover and the inner cage. The air filter unit is installed into the cable management brackets, and are held tightly by captive screws.

Regularly inspect the air filter. A dirty air filter restricts airflow in the unit, producing a negative effect on the ventilation of the chassis.

Caution

Do not operate the switch for more than two minutes without the air filter unit installed on it. Because the fans are very powerful, they could pull small bits of wire or other materials into the switch chassis through the unfiltered air intake. This could damage the switch and its components.

Before you begin to remove the air filter unit, ensure that you have the following parts and tools available:

  • A Phillips (+) screwdriver, number 2 (not provided)

  • A replacement air filter unit

Warning

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

To remove the air filter unit:

  1. Wrap and fasten one end of an ESD wrist strap around your bare wrist, and connect the other end of the strap to the ESD point on the switch.
  2. Loosen the captive screws located on either side of the air filter unit attached to the cable management brackets on the front of the switch.Note

    It is not necessary to remove the cables from the cable management brackets to access the air filter unit or the air filter.

  3. Grasp the air filter unit and gently pull the air filter unit out of the cable management brackets (see Figure 3).
    Figure 3: Removing the Air Filter Unit
    Removing the Air Filter
Unit

Installing the Air Filter Unit in an EX9253 Switch

The air filter unit consists of three parts–the outer filter cover, the air filter, and the inner cage. The air filter sits between the outer cover and the inner cage. The air filter unit is installed into the cable management brackets, and are held tightly by captive screws.

Regularly inspect the air filter. A dirty air filter restricts airflow in the unit, producing a negative effect on the ventilation of the chassis.

Before you begin to install the air filter unit, ensure that you have a Phillips (+) screwdriver, number 2 available.

Warning

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

Note

The air filter unit is installed on the cable management brackets. Before installing the air filter unit, ensure that the cable management brackets are installed on front of the switch.

To install the air filter unit:

  1. Wrap and fasten one end of an ESD wrist strap around your bare wrist, and connect the other end of the strap to the ESD point on the switch.
  2. Ensure that the air filter is right-side up.
  3. Grasp the air filter unit and slide into the rails on the cable management brackets until it fits snugly on the cable management brackets (see Figure 4).
    Figure 4: Installing the Air Filter Unit
    Installing the Air
Filter Unit
  4. Tighten the captive screws to secure the air filter unit.

Removing the Air Filter from the Air Filter Unit in an EX9253 Switch

The air filter unit consists of three parts–the outer filter cover, the air filter, and the inner cage. The air filter sits between the outer cover and the inner cage. The air filter unit is installed into the cable management brackets, and are held tightly by captive screws.

Regularly inspect the air filter. A dirty air filter restricts airflow in the unit, producing a negative effect on the ventilation of the chassis.

Caution

Do not operate the switch for more than two minutes without the air filter unit installed on it. Because the fans are very powerful, they could pull small bits of wire or other materials into the switch chassis through the unfiltered air intake. This could damage the switch and its components.

Before you begin to remove the air filter, ensure that you have the following parts and tools available:

  • A Phillips (+) screwdriver, number 2 (not provided)

  • A replacement air filter

Warning

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

To remove the air filter:

  1. Wrap and fasten one end of an ESD wrist strap around your bare wrist, and connect the other end of the strap to the ESD point on the switch.
  2. Loosen the captive screws located on either side of the air filter unit attached to the cable management brackets on the front of the switch.Note

    It is not necessary to remove the cables from the cable management brackets to access the air filter unit or the air filter.

  3. Grasp the head of the loosened screws and pull the screws to remove the outer cover of the air filter unit.

    The air filter is installed at the center of the air filter unit, behind the outer cover (see Figure 5.

    Figure 5: Removing the Air Filter from the Air Filter Unit
    Removing the Air Filter
from the Air Filter Unit
      1
    Outer cover
      3
    Inner cage
      2
    Air filter
     
  4. Grasp the air filter and pull it straight out of the air filter unit.

Installing the Air Filter in the Air Filter Unit in an EX9253 Switch

The air filter unit consists of three parts–the outer filter cover, the air filter, and the inner cage. The air filter sits between the outer cover and the inner cage. The air filter unit is installed into the cable management brackets, and are held tightly by captive screws.

Regularly inspect the air filter. A dirty air filter restricts airflow in the unit, producing a negative effect on the ventilation of the chassis.

Before you begin to install the air filter, ensure that you have a Phillips (+) screwdriver, number 2 available.

Warning

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

To install the air filter:

  1. Wrap and fasten one end of an ESD wrist strap around your bare wrist, and connect the other end of the strap to the ESD point on the switch.
  2. Loosen the captive screws located on either side of the air filter unit attached to the cable management brackets on the front of the switch.Note

    It is not necessary to remove the cables from the cable management brackets to access the air filter unit or the air filter.

  3. Grasp the head of the loosened screws and pull the screws to remove the outer cover of the air filter unit.

    The air filter must be installed at the center of the air filter unit, behind the outer cover (see Figure 6.

    Figure 6: Installing the Air Filter in the Air Filter Unit
    Installing the Air Filter
in the Air Filter Unit
      1
    Outer cover
      3
    Inner cage
      2
    Air filter
     
  4. Grasp the air filter, and place the air filter straight in front of the inner cage.
  5. Place the outer cover back in its place.
  6. Tighten the captive screws to secure the air filter unit.

Maintaining the Air Filter in EX9253 Switches

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, producing a negative effect on the ventilation of the chassis. The filter degrades over time. You must replace the filter every six months.

    Caution

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

  • EX9253 switches ship with one air filter. Spare air filters are separately orderable. The shelf life of the air filters vary from two to five years depending on the storage conditions. Store spare air filters in a dark, cool, and dry place. Wrap the air filters separately using plastic wraps and store them in an environment with RH between 40% to 80% and temperature between 40° F to 90° F. Storing air filters at higher temperatures or where they can be exposed to ultraviolet (UV) radiation, hydrocarbon emissions, or vapors from solvents can significantly reduce their life. If an air filter develops flakes or becomes brittle when rubbed or deformed, you must not use it.