st3pf delay off timer wiring

Hi im looking to wire a st3pf delay off timer, adjustable up to 3mins to the water pump that feeds the night heater in my camper, basically i want the pump to run on for 3 minutes after i turn the night heater unit off. The diagram on the side of the 8 pin plug in timer states; terminals 7 and 2 input; (doesnt state which is positive and negative) terminal 8 com terminal 6 no terminal 5 nc above terminal 3 is the word "connection" then a linking line to the word "reset" before carrying on to link to terminal 4 terminal 1 has been ommitted. can someone explain which wires i need to link to which terminals? thanks steviestevie

Hi sorry new to this site and states i must state mame model of vehicle etc. Its a 2007 mercedes sprinter camper with a webasto night heater fitted steviestevie

Hi thanks for that, i assume 120v will work in much the same way as a 12v timer, although im still not sure which wires i should be attaching to terminal 3 and terminal 4 stevestevie

I believe 3 and 4 you hook up a momentary switch to reset the device. With the model# you provided, that is the diagram.