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Operation MAC2000
achieved. When the A/C system reaches the proper vacuum, the
unit’s red light and beeper signal evacuation is complete, and the
screen reads “Vacuum complete.” If the proper vacuum is not
achieved after 7 minutes of evacuation, the process stops, and the
technician is prompted to check for a leak.
Note: Depending on the altitude, the A/C system may not be able to
achieve 27 inHg. It is important that the altitude setting in the Set-
Up menu is correct for your location. The MAC2000 uses this
information to calculate and provide an equivalent set point for
your altitude. (For instance, at 6000 feet the equivalent set point
for your altitude pulls to 22 inHg before completing evacuation).
6. Press the Reset key to return to the Main menu.
7. The technician can now proceed to charge the system.
3.5 Charge Mode
The Charge mode is designed to add a precise amount of refrigerant to
the vehicle’s A/C system. This mode can be used to either “top off” a
system, or do a complete recharge after the system has been evacuated
or flushed. The unit has a built-in default charge amount of 2 pounds
(0.91 kg). Other charge amounts can be entered in increments of
either 0.06 pounds, 1 ounce, or 0.02 kg.
1. If not already done, plug the MAC2000 into a properly grounded
AC outlet; set the Power switch to ON; then wait until the unit
completes its self diagnostics. The screen will display “Select
mode” when ready.
2. Press the Charge mode function key and observe that the message
“Hook-up the service hoses to vehicle” should appear. If not
already done, connect the high- and low-side service hoses to their
respective service ports on the vehicle’s A/C system, and then open
the system’s service-port valves.
Note that at the start of this step, before the service hoses are
connected, the MAC2000 first checks if the service hoses are under
a vacuum. This prevents air and other contaminants from being
introduced into the A/C system. If the message “The vehicle is
not properly evacuated” appears, perform one of the following:
• If the refrigerant in the A/C system has just been recovered,
evacuate both the system and the service hoses per Section 3.4.
• If the A/C system needs to be “topped off,” first ensure that the
service hoses are disconnected from the vehicle; then either
recover the hoses per Section 3.3 if they contain refrigerant, or
evacuate the hoses per Section 3.4 if they contain air.
20 Instruction 2072-0400