Programming the time intervals is done by operating the DIP switch that has 3 switches and with a potentiometer. Depending on the position of SW1 1 and 2 contacts, the timer can be configurated for the 4 time ranges
For the 0.3 second to 10 minutes timer version the potentiometer is 100kΩ, R1 = 9.1kΩ, R2 = 910kΩ, R3 = 220kkΩ and C1 = 100µF.
For the 15 seconds to 10 hours timer version the potentiometer is 1MΩ, R1 = 51kΩ, R2 = 1.2MΩ, R3 = 1.2MΩ and C1 = 1µF.
Circuit 10 Hours Timer Relay
In order to start the timining you have 2 possibilities: you either connect the START point to ground GND and in this case the timer starts when you connect it to the voltage supply or you can place a switch to start it.