4. Unpacking the UnitFATEK HMI x1 Hook and Screw x4A4 Double-sided Installation Guide x15. Installation Procedures Push the HMI into the cutout until thewaterproof ring contacts the plate. Insert a hook into each mounting holeon the HMI, and then tighten thescrews evenly with a moderate torque. Failure to tighten the screws maycause the HMI to fall, malfunction orshort-circuit. Excessive tightening maycause deformation. The necessarytorque is about 0.16N·m.5Power Connector x1