WFCO WF-8900MBA Series, Operator'S Manual

Perform the following steps:

1.  Remove the door assembly by loosening the two screws located in the upper left and   

     right corners. The screws are captive and will not fall out. Pull forward and outward on 

     the door assembly to clear the case.

2.  In the upper left portion of the fuse board, loosen the 

NEG-

 lug (White wire) and the 

VCC+

 lug (Red wire). Do not back the lug screws all the way out.

3.  Locate the tab at the bottom of the fuse board holding the board in place. Gently 

     depress the tab allowing the fuse board to be pulled forward.

4.  With the fuse board pulled slightly away from its mounting, pull the Red and White 

     wires out of the lugs.

5.  In the AC section of the enclosure, locate the Black wire coming up from the converter 

     in the lower section. As an extra precaution, 

MAKE SURE THE CONVERTER 

     BREAKER IS IN THE OFF POSITION

. Remove the wire from the breaker. NOTE: 

     this wire has a metal pin terminal on the end inserted into the breaker. Remove and 

     position out of the way any wire connected to the pigtail.

6.  Locate and remove the converter’s Green Ground wire attached to the AC Ground bar 

     on the left side of the compartment. In a similar fashion, locate and remove the 

     converter’s White Neutral wire attached to the AC Neutral bar at the top of the 

     compartment. 

7.  In the converter compartment, remove the two screws at the front of the MBA holding 

     it in place. Slide the MBA forward routing the wires through the slots in the case until 

     the MBA clears the enclosure. 

If the MBA is being returned under a warranty claim, follow the packaging instructions in 

your warranty claim packet.

When installing a replacement MBA, reverse the order of steps 1-7. 

Figure 4

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