When the LTC is ON, your system will not turn on if temperatures reach or drop below 5°F. When the system is on and senses the temperature drop to 5°F, the system will delay-off.
The DS5 has 2 x 30amp relays that are useful when you are heating both your driveway/walkway/stairs or even your roof/gutter at the same time. No need for separate controllers to do both jobs.
When the LTC is ON, your system will not turn on if temperatures reach or drop below 5°F. When the system is on and senses the temperature drop to 5°F, the system will delay-off.