Accessory fan coolant switch

[FORSFED]

Ok, I finally picked up an accessory fan harness at the junk yard yesterday and I wired up my SPAL fan to the factory harness. Now my question is at what temp is the switch supposed to turn the fan on??? I warmed up my car and let the coolant get up to just 220* on my Autometer gauge and the fan still hadn't turned on so I'm wondering if my switch in the radiator is bad or if I'm just missing something...