You posted under GE 15004 timer.
To make sure we are discussing same timer, see image of product at Jasco:
http://www.jascoproducts.com/products/pc/GE-24-Hour-Plug-In-Timer-86p169.htmIf this is not your timer, then add a comment.
I do not have a manual for this timer.
Jasco has not posted manual for 15004 timer.
http://waterheatertimer.org/GE-timers-and-manuals.html#15004Looking at timer, it appears as if the following instructions apply.
Since you have the product and instruction sheet, add a comment if your knowledge of the details varies: Your contribution to the fixya community is helpful to others.
To set timer:
Rotate dial clockwise until current time lines up with pointer.
Move red and green pins to hours you want timer to turn on-off.
Pins are non-removable.
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