Maintenance
SMA America, LLC
84
SB50US-80US-eng-IUS112633
Installation Guide
Setting the Jumper
The Sunny Boy only detects the jumper after it is restarted. All LEDs must go out prior to a restart.
1. Disconnect the Sunny Boy on the AC and DC sides. Wait 5 minutes until the residual voltage
has been drained.
2. Open the Sunny Boy as described in section 6.2 ”Opening the Sunny Boy” (page 38).
3. Insert the jumper supplied into the slot on the sequential control board shown below.
4. Close the Sunny Boy as described in section 6.7 ”Closing the Sunny Boy” (page 58).
5. Check the air flow of the fans.
– The Sunny Boy draws in cold air through the fans and lets it out again through the handle
covers.
– Pay attention to unusual sounds.
6. After checking the fans, remove the jumper.
Jumper position for checking the fans
