ACH550 Installation, Operation and Maintenance Manual 35
ACH550-UH
3. Undo the four fastening screws at the corners of the fan frame. The screws are 
through bolts with nuts on the inside of the cabinet. (Do not drop the hardware into 
the drive).
4. Remove the fan and fan frame as one unit.
5. Disconnect the fan wiring and capacitor from the fan 
frame. Then remove the four screws attaching the 
fan to the fan frame. Remove the old fan.
6. Install the new fan and capacitor 
with the replacement part for ABB 
in the reverse order of the above. 
Ensure the fan is centered on the 
velocity stack and rotates freely.
Enclosure air filter replacement – UL Type 12 enclosures
Frame Sizes R7/R8 – UL type 12 enclosure inlet air filter
The inlet air filter for the R7/R8 UL type 12 enclosure is located in the enclosure front 
door.
1. While holding the top of the filter frame, pull up on the bottom of the frame. The filter 
frame will slide up approximately 3/4 inch and can then safely removed by tilting 
away from the cabinet and lifting up.
PC00014
Velocity 
 
Capacitor
 
Stack