Replace a failed cooling fan

Description of cooling fans

The cooling fans circulate air within the patented cabinet cooling system. The cooling fan module is located under the cabinet roof.

Cooling fan module view

Procedure to test cooling fan operation

Verify cooling fan operation as part of regular cabinet maintenance.

Step	Action
1.	Locate the HX Fan Test near the temperature sensor grille on the DC Distribution panel.
2.	Insert a small wire (such as a paper clip) into the INT test hole to press the start button for the internal cooling fans. The fans will automatically shut off after running for 30 seconds. If the fans do not start, replace the fans.
3.	Insert a small wire into the EXT test hole to press the start button for the external cooling fans. The fans will automatically shut off after running for 30 seconds. If the fans do not start, replace the fans.

An over temperature condition will occur as the result of a failed cooling fan.

Procedure to replace the cooling fan module

Step	Action
1.	Open the cabinet roof. See the roof access procedure.
2.	Remove the cartridge screws around the perimeter of the cooling fan module.
3.	Lift the back end of the cooling fan module and slide it backward, then up to remove.
4.	Disconnect the two power cables by pressing both sides of the cable plug toward the center then pulling the plug out.
5.	Replace the old cooling fan module with the new one.
6.	Re-connect the two power cables to the new cooling fan module.
7.	Slide the new cooling fan module into place. You may need to push excess cabling back into the cabinet before lowering the new cooling fan module into place flush against the cabinet.
8.	Replace and tighten all cartridge screws around the perimeter.
9.	Close the cabinet roof. See the roof closure procedure.