AC3000 digital manifold is a professional  instrument for installation, testing and maintenance of refrigeration equipment such as air conditioners and cold stores. It combines 2-way pressure test, dual temperature measurements ( with optional dual temperature probes ), a 32-bit digital processor and a large LCD in one easy-to-use instrument with the following main functions. 1.Pressure and Saturation Temperature. 2.Vacuum Operation. 3.Pressure Leak Test with recording. 4.Direct T1 T2 Temperature, Real-time Super heat and Sub cooling Simultaneously Display with Optional Two Clamp-on Temperature Probes. 5.89 Refrigerant Profiles Stored in The Instrument. 6.Automatic Multi-unit Pressure Conversion. 7.Automatic Temperature ℃/℉ Conversion. It is the right one you have to do the job right. Pressure Measuring: 1. Turn off the blue valve and red valve. 2. Turn on the instrument. Then verify that LCD displays the status of the pressure test.If not,press the function button to switch it. 3. When the instrument is turned on, there may be 10 digits in the high and low pressure display area. At this time, press the zero button long until it returns to zero. 4. Press R+/ R- buttons , Unit button and ℃/℉ button to select tested refrigerant and reading display respectively. 5. If the clamp-on temperature probes have been connected to the instrument, the real-time temperature will be displayed.If not, no display of it. 6. Connect the instrument to the refrigeration system according to the chart below. 7. Turn on the refrigerant valve and gently press the pressure release valve to vent the air in the connecting hose. 8. When the refrigeration system stops, turn on the high pressure valve (red valve) and fill with a certain amount of refrigerant and then shut the valve quickly. 9. Run the refrigeration system, turn on the low pressure valve (blue valve), and fill with the refrigerant into the refrigeration system. 10. After the filling is completed, shut the low pressure valve (blue valve) and refrigerant valve. Let the refrigeration system running. 11. Shut down the refrigeration system,make sure all valves are turned off , then disconnect the instrument between refrigeration system and source. Do not remove the high pressure valve connection until the pressure drops to the safe point. Then turn off the instrument. Vacuum Operation: 1. Turn off the blue valve and red valve. 2. Power on the instrument. Then make sure the LCD displays vacuum test status.If not, press the Function button to switch it. 3. When the instrument is turned on, there may be 10 digits in the high and low pressure display area. At this time, press the zero button long until it returns to zero 4. Press the unit button to adjust the reading unit. 5. Connect the instrument to the refrigeration system.(Connected clamp-on temperature probes will not affect the operation.) 6. Turn on the blue valve and red valve, and start the vacuum pump. 7. After the vacuum operation is completed,turn off the blue valve and red valve, then shut the vacuum pump. At this time,pressure leak test mode can be used to check leakage in the system ( Please refer to Pressure Leak Test). Pressure Leak Test: 1. The instrument is powered on with the blue and red valves turned off. 2. Press the Function button to pressure leak test mode.