12-44 Cabinet maintenance operations
AccessNode 323-3001-210 Issue 1.0
Procedure 12-13
Replacing an external fan unit in the heat exchanger
roof
This procedure explains how to replace an externally mounted fan unit in the
Series 800A cabinet with the NT7A69DA-FA heat exchanger roof options.
Note: Fan replacement must be completed within four hours of failure.
Equipment or service outages may result due to excessive heat build-up in
the cabinet
.
Tools required
• can wrench (216 tool) with Harris insert part number 10660-001
(tool and insert shipped inside the cabinet)
• stubby Phillips head screwdriver
• 5-foot step ladder
Action
Step Action
1 Remove the roof cover by loosening the 10 1/4-turn fasteners and removing
the four lifting eye bolts and set it aside a safe distance.
2 Open the electronics compartment doors and swing frames and locate the
defective fan (see Figure 12-11 on page 12-45).
3 Turn OFF circuit breakers CU A and CU B on the BIP.
4 Replace the defective fan by removing the two screws and fan grill.
5 Disconnect the fan connector from the fan wiring harness (see Figure 12-11
on page 12-45).
Note:
Do not discard or misplace the two screws and fan grill.
6 Install the new fan using the screws and fan grill removed in step 4.
7 Plug the fan connector back into the fan wiring harness.
8 Repeat step 4 through step 7 for each defective fan.
9 Turn CU A and CU B ON to verify that the new fan is operating properly.
10 Close the equipment bay frames and the electronics compartment doors.
—continued—
CAUTION
Fire hazard
Remove all paper and any other combustible materials from
inside the cabinet before the cabinet is powered up.
Failure to comply with this warning could result in a fire.
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