Can North American split-phase 220VAC supply power to a device designed for single phase power?
First of all: 220V is very dangerous! Do not mess around without proper knowledge and safety procedures and equipment. Be sure to never wire things without being unplugged or with the breakers at off! Measure voltages at all times before wiring or touching power cables. If you aren't sure, call a professional electrician. 

As for the question: the answer is yes, you can safely plug split-phase 220V into the L and N terminals safely. The ⏚ label indicates Ground, or Equipment Ground. This is usually a bare wire in 220V wiring. 

By using this diagram as an example you can see why we call 110V with the labels Line and Neutral. There is 110V between any Line and the Neutral. There is 220V between any two Lines.

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To wire your power supply, simply connect the two Lines (Hot) to the L and N respectively. ex. Line 1 (usually red) goes to the L label of the power supply. Line 2 (usually black) goes to the N label of the power supply. The ⏚ label indicates earth ground. This is usually the bare/green wire in the middle of a 220V cable, or the wire connected to the metal casing of a 220V electrical box. 

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