Wiring a pool timer

I am trying to wire an Intermatic T101R201 which has a heater control that shuts off the heater 20 minutes prior to the filter cycle time. I have a three wire coming from the panel, I am only using 2 wires and keeping the service 110V, hooked to a 20A breaker. The filter and pump wires can be seen in the picture coming up from the bottom of the timer. Heater wire is on the left and Pump wire in on the right. The feed is coming from the side of the box on the right.

The only instructions provided are on the cover of the timer and are not clear to me where I am hooking the heater too. Can someone help me with some explicit directions to which wires are going to which connection points( A, 1, 2 or the two black wires on the right of the panel.

Thanks for the help

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Wiring a pool timer