Davis WeatherLink for Alarm Output Add. Instrukcja Użytkownika Pobierz pdf (Strona 13)

“Greater Than or =” or “Less Than or =” difference. Make sure the equa-

tion you create results in

the check that you want. Some examples are

provided below:

1. A user wants to activate a fan to bring in cooler outside air to passively

cool their house. This affect only works if the temperature outside is 5°F

lower than the inside temperatures. Additionally, you don't want to cool

your house if the inside temperature is 70°F or lower. This can be

expressed as:

“IF Inside Temperature Minus Outside T

emperature IS Greater Than or =

5.0°F. AND Inside Temperature IS Greater Than or = 70°F; DONE.”

2. A user wants to activate the sprinkler system when the

Daily ET exceeds

the Daily Rainfall by 0.05":

“IF Daily ET Minus Daily Rain IS Greater Than or = 0.05; DONE”.

3. A user wants to activate

environmental controls whenever the tempera-

ture outside differs from the insid

e temperature by 20°F or more.

Whether it is hotter or colder outside does not matter, but if the inside

temperature is between 68°F and 72°F, there is no need to alter the inside

temperature:

“IF Outside Temperature Minus Inside T

emperature IS Greater Than or =

20.0°F OR Inside Temperature Minus Outside Temperature IS Greater

Than or = 20.0°F AND Inside Temperature is NOT Between 68°F &

72°F; DONE”.

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Davis WeatherLink for Alarm Output Add. Instrukcja Użytkownika Strona 13