I'm not really sure what your question is on this one... how to wire the contactor?
The contactor is just a relay. A1 and A2 power the coil, so assuming your contactor has a 120v coil, one of those is neutral, one is hot. Polarity doesn't matter.
I can't tell if your contactor has a suggested load / service orientation, but it shouldn't matter as it's really just a switch. So wire one side up for your service, one side for your load. Bam, you're golden.
Building a Bad News Brewery - eHERMS
2013 Brew Count:
15g Southern Pecan (Blind Squirrel)
15g Ed Wort's Apfelwein
5g Saison (Resurrection)
15g Irish Red (Bloody Knuckles)
10g American Pale (Bear Naked Pail Ale)
5g Chocolate Oatmeal Milk Stout (Sunday Morning)
5g Winter Spiced (Blarmody's)
Keg 1: Apfelwein
Keg 2: Blind Squirrel
Keg 3: Bear Naked Pail Ale
Aging: Sunday Morning
Carboy 1: Apfelwein
Carboy 2: Blarmody's Winter Spice Ale
On Deck: Angry Dwarf - Wee Heavy