Maintenance
SMA America, LLC
84
SB50US-80US-IA-en-36
Installation Manual
Setting the Jumper
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 6.3 ”Opening the Sunny Boy” (page 39).
3. Insert the jumper supplied into the slot on the sequential control system board shown below.
4. Close the Sunny Boy as described in section 6.8 ”Closing the Sunny Boy” (page 56).
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.
The Sunny Boy recognizes the jumpers after the restart.
All LEDs must be off prior to a restart.
