You can turn off 240Volt circuit by turning off 'one leg.'
240Volt circuit has two hot wires that come from breaker box, so 240V has two legs:
These hot wires are usually labeled L1 L2 in wiring schematics.
FD60 timer is usually SPST and has two wiring terminals, but some versions are SPDT and have 4 wiring terminals.
Cut L1 line in half, and put each end into FD60 terminal.
Open following link for rough drawing:
http://waterheatertimer.org/images/FD60-wired-to-control-240V.jpg
Open following links for more illustrations and information:
http://waterheatertimer.org/B220C.html
http://waterheatertimer.org/See-inside-main-breaker-box.html
http://waterheatertimer.org/Countdown-timer-horsepower-ratings.html
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