SMA America, LLC
Maintenance and cleaning
Installation Guide
SB20_25_30HFUS-eng-IUS113711
73
9.1.2 Checking the Fan
1. Request the installer password from the SMA Service Line (contact info see page 109).
2. Set the ”CoolSys.FanTst” parameter to ”on” in the installer mode using a communications
device (e.g. Sunny WebBox, Sunny Explorer).
3. Check the air-flow of the fan. The Sunny Boy takes cooling air in from underneath and then
blows it out through the cooling fans. Listen for any unusual noise, which could indicate incorrect
installation or that the fans are faulty.
4. After the test, set the parameter ”CoolSys.FanTst” back to position ”Off”.
☑ The fan has been checked.
Checking the Fan
In order to check the fan you need a special data acquisition device (e.g. Sunny WebBox)
or a PC with the appropriate software (e.g. Sunny Explorer) in order to be able to change
the parameters of the Sunny Boy.
You will also need the installer password to access the installer mode.
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