C8835 Intermatic Timer, 30 Minute Cycle, used for and EFM coal stoker to keep it burning in summer. We are not sure how to hook up the timer, we did put the green wire on the green nut, not sure which numbers to jump. We hooked it up started working, and then it trips the circuit breaker to our electrical panel shutting down stove. Any advice will be helpful and don't know where to set pins on dial?

Intermatic C8835 is 120Volt 30-minute cycle timer, which repeats same timing cycle every 30 minutes.
Timer has NO and NC terminals.
You will not use the NC normally closed terminal for this application, so no wire will connect to far left NC screw.

Jodie,
Green wire on green screw is correct, so you have started off well.
Bare copper wire also connects to green screw, so no more talk is needed about ground wires.

If you are using 240V or 277V, then add a comment and we'll lay out a plan for that wiring.
Wiring below is for 120V only.

You have 2 120Volt cables.
1) One cable comes from circuit breaker and has 1 black and 1 white wire.
The black 'line' wire connects to 'switch common' terminal, which is 3rd screw from left.
The white 'neutral' wire connects to 'clock' terminal, which is 4th screw from left.

2) The second cable goes to coal stoker, and has 1 black and 1 white wire.
The black wire connects to Normally Open or NO terminal which is 2nd screw from left.
The white wire connects to Clock terminal, which is 4th screw from left.

Notice that both white wires connect to same screw.

Upvote the help.
And take advantage of fixya expert assistance live.
For a price, expert works with you while you work on timer or any do-it-yourself project.
Fixya is always less expensive than a service call.