Wiring a Natural Gas Hot water Boiler?

I Have replaced the dual control on boiler & I misplaced the wiring diagram for it (made a diagram when I removed it 3 months ago) The Dual Control has Two Dials on it with 2 terminal screws under each Dial, One dial is Limit & Other is Circulator ... I have a total of 6 wires that go to the dual control, 2 wires from the circulator pump, I'll asume goes to the circulator dial.. I'm not sure where the othe 4 wires go? 2 wires from the gas vavle & the other 2 are form the thermostat, Do these 4 wires go onto the limit dial Or does any of them go onto the circulator dial? .. I know that the thermostat are low voletage & I'm worried of wiring it wrong... Any input is greatly apreciated....