Using this Sharp refrigerator defrost timer is easy. Just install it according to the mounting holes and connect the spade terminals as required. Make sure to check the voltage of your refrigerator to ensure it's within the 200 - 240V range. When using, the timer will automatically switch between the 8 - hour on and 12 - minute off cycle. As for maintenance, keep it clean and free from dust. Check the terminals regularly for any signs of wear or corrosion. If you notice any issues, it's best to consult a professional technician. Since we've been in the appliance parts business for over 25 years, we're here to support you if you have any questions.