Description: Small size, light weight and versatility, easy for carry and space saving. Control temperature by setting the temperature setting value and the difference value. Can be used for domestic freezer, water tanks, refrigerator,industrial chiller, steamer, industrial equipment and other temperature control applications. Cover high quality ABS material shell, durable, high temperature resistant and can be used for a long time. This temperature thermostat with powerful function, cooling and heating mode convertible, automatic timed defrosting, manual, heating wire defrosting and temperature correction. Specifications: Item name: Digital Temperature Controller Measurement range: 1-50~99 Measurement accuracy: 11 (-50"70) Resolution: 10.1 Overall power consumption: 1 le than 3W Sensor: NTC sensor (1 m) Ambient temperature: 10~60 Relative humidity: 1 20-85% (no condensation) Size: 75 x 34.5 x 85MM Mounting opening: 71 x 29MM External E material: ABS flame retardant plastic shell Output capacity: Refrigeration (10 a / 250 vac) Heating (10 a / 250 vac) Color: Black Key operation instruction 1 .The way to check parameter: Under normal working status, pre "up" key it displays temperature setting value; pre "down" key it displays the difference value. 2. The way to set parameter: Under controller normal working status, pre "s"key for 3s or more to enter parameter modifying mode, and the "Set" indicator light on, screen displays the first menu code "F1". Pre "up"key or "down" key to adjust up and down and display the menu iem and the code of the menu item.Pre "s" key to display the parameter value of the current menu. Pre both "s"key and hold "up"key or "down" key simultaneously to choose and adjust the parameter value of the current menu value promptly. After finishing the setting, pre and release the "(I)" key instantly to save the parameter modified value and return to display the normal temperature value. If no key operation within 10 seconds, system won't save modified parameter, screen back to display normal temperature. 3. Restore system data When electrified, system will check itself, screen will display "Er" if error exit, please pre any key at this time, and it restores default value and enter into normal working mode, it is advised to reset the parameter value under such conditions. Operation instruction Under controller normal working status, pre and hold "(I)"key for 3s can turn off the controller; Under controller "off" status, pre and hold "(I)" 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 compreor 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 = temperature set value, the "Heat" indicator light is off, and the heat relay disconnects. Error/Alarm description Alarm when sensor error: Controller activate the sensor error alarm mode when sensor open circuit or short circuit, all therunning status is closed off with the buzzer alarms, and the nixie tube displays EE,Pre any key can cancel alarm sound, system back to display the normal temperature when the error and the fault is cleared. Alarm when the measuring temperature exceeds temperature measuring range:Controller activates the error alarm functionwhen the measuring temperature exceeds the temperature measuring range, all the running status is closed off with the buzzeralarms, and the nixie tube displays HH,Pre any key can cancel alarm sound, system back to display the normal working mode when the temperature restore to normal measuring range. Safety Regulations Danger: 1.Strictly distinguish the sensor down-lead, power wire and output relay interface from one another, and prohibit wrong connections or overloading the relay. 2.Dangers: Prohibit connecting the wire terminals without electricity cut-off. Warning: Prohibit using the machine under the environment of over damp, high temp., strong electromagnetism interference or strong corrosion. Notice: 1.The power supply should conform to the voltage value indicated in the instruction. 2.To avoid the interference, the sensor down-lead and power wire should be kept a distance. Packing list Package includes:(Choice one) 1 x Digital Temperature Controller(12V/24V/110V-220V Optional)