Wine Guardian D050 Installation, Operation And Maintenance Manual page 30

Sample serial plate
DO NOT:
 DO NOT MODIFY THE PLUGS IN ANY WAY! 
 Do not use extension cords.
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The electrical power supply must be either 115 volt or 230 volt AC, 1 phase, 60
 cycle, depending on the model of the unit, and cannot vary more than
plus or minus 4% or damage may occur to the unit.

Plug the unit into the wall outlet. Gently pull on the plug to make sure it is tight.
Fig.1 Plug configurations
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30
IMPORTANT