Under controller normal working status, press and hold"" ""key for 3s can turn off the controller; Under controller ""off"" status, press and hold"" "" key for 1s can turn on the controller. Under the controller normal working status, screen displays the current measuring temperature value; also the controller can also switch the working mode between heating and cooling. Controller starts refrigerating with cool indicator light on when the measuring temperature value≥ temperature set value + difference value, and the refrigerating relay is connected; If the ""Cool"" indicator light flashes, it indicates the refrigerating equipment is under compressor delay protect status; when the measuring temperature values≤ temperature set value, the Cool indicator light on, and
refrigerating relay disconnects. System starts heating when the measuring temperature value≤ the temperature set value-difference value, and the ""Heat"" indicator light
on, the heat relay connects; When the measuring temperature 2 temperature set value the ""Heat"" indicator light is off, and the heat relay disconnects.