You posted under GE timer, but added the brand name Intermatic.
GE and Intermatic timers are totally different.
Wiring below is for GE and will not apply to Intermatic.
Step 1) lets cover basic GE timer wiring for 240Volt load.
Be sure to set dip switches BEFORE applying power.
Step by step illustrations show on following link.
http://waterheatertimer.org/How-to-wire-GE-15207-timer.htmlStep 2) Load wires exit GE timer.
There are two Hot wires and 1 bare ground wire.
Step 3) Wire the outlets: You have 4 240Volt plugs.
This could mean a receptacle-type outlet like a clothes dryer outlet or air conditioner outlet.
Or it could be a twist-lock receptacle or extension-cord-type stage plug.
In all cases, look at screw color on device.
Connect Hot wires to brass colored screws.
Connect ground wire to green screw.
Step 4) Calculate total Load
Manual appears below: Look at Normally Open contacts. These contacts turn ON when timer turns ON.
http://waterheatertimer.org/15087-15207-56922-Manual-eng.pdfTotal load on all 4 plugs cannot exceed 2 HP
Generally, a 30 amp timer is rated for max 24 Amps or 6 amps per each of the 4 plugs.
Volts x amps = watts.
Take total watts and divide by 240Volts to get amps.
Add a comment for more free help.
Also take advantage of fixya phone service.
For a price, expert speaks with you over phone while you work on timer or any do-it-yourself project.
Fixya is always less expensive than a service call.
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