No information on the unit with the electronic fan and limit board, thermostat terminal..ect..only that I can see the temperature by pressing the left button . No mention of the right buttons purposes or how to set fan limit control,which is needed as min

No information on the unit with the electronic fan and limit board, thermostat terminal..ect..only that I can see the temperature by pressing the left button . No mention of the right buttons purposes or how to set fan limit control,which is needed as mine is set at less than 10deg apart. Please send info