hi guys have had to replace a faulty thermostat for a customers fridge. the old thermostat had only two pins. i was give a Ranco VT9. i connected the wires to pins 3 and 4 is this correct? when i turned the dial to off position the fridge did not stop. i did not have time to wait for the fridge to pull temp? can some please explain how this thermostat works, the wiring diagram show pins 6,3,4 , heater and compressor. what is warm out, cold out is this the temperature range? I am commercial tech never worked on a domestic fridges. any help would be much appreciated. Thank you.