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the A/C system and could cause the A/C compressor to conduct a deadly amount of electrical
current.
Follow the instructions displayed on the screen.
1. Connect the couplers to the flush fittings on the side of the machine.
2. Open the couplers by turning the knobs completely clockwise.
3. Open the red and blue valves on the front of the machine. Press next to continue.
4. The machine will now run a hose flushing cycle. This could take several minutes
to ensure the removal of non-compatible oil. Press done to return to main screen.
o IDENTIFICATION: The identification process ensures that R1234yf refrigerant is in the system.
Follow the instructions on the screen. This process will also be performed each time the
machine begins the tank filing or recovery procedure
o UPDATE: This is used for software updates via a USB connection
• DOCUMENTS: Set up and operational information of the machine
• VEHICLE FLUSH: Purchase of a flush hose required. Vehicle flush uses the refrigerant to flood a
closed A/C system in order to remove most of the A/C oil. The machine will drain any collected oil
into the used oil bottle. The same quantity of new oil can then be injected into the A/C system to
increase the compressor life.
NOTE: The condition of the A/C oil should first be checked to determine if flushing is necessary or
appropriate. See Mastercool A/C System Visual Inspection Sight Glass.
• HELP: The help screen will display all the information about the machine. The machine part
number, brand, model, machine ID, software version, firmware version and database version will be
displayed
VISUAL INDICATOR LIGHTS:
The COMMANDER machines are equipped with visual indicator LED lights to inform on the progress of the
machine.
• RED: No connection between USB and computer command center. Contact customer service
• BLINKING RED: Procedure Alarm. Contact customer service
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