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MAC2000 Operation
3. After entering the Charge mode, the following options are
available:
• Press the Enter key to accept the 2.00 pound Default.
• Press the Weight Convert key to change the “Set charge
weight” units.
• Use the Increase or Decrease keys to set the desired charge
amount. Select the next higher value if the exact charge
amount cannot be entered. Press Enter to accept the charge
amount shown on the screen.
Note: The MAC2000 charges in one-ounce increments, regardless of
which unit of measure is selected. This means that sometimes the
exact charge amount cannot be entered. For example, the A/C
system may require a 1.03 kg charge. The MAC2000 will only allow
a setting of 1.02 kg or 1.04 kg. In this instance, always select the
next higher value. This difference is only 0.3 of an ounce, which will
not affect the vehicle’s A/C performance.
4. By default the MAC2000 charges liquid refrigerant directly into
the high side of the A/C system. A technician, however, may choose
to charge into both the high and low side by pressing the Low side
ON-OFF function key. Pressing this key toggles the low-side option
on and off. Important! Charging liquid directly into the low side of
the compressor could slug the compressor and cause permanent
damage. Check with the compressor manufacture before proceeding.
5. The screen should now show the amount of refrigerant set for
charging. Press the Start key to begin the charging process.
During the charging process, liquid refrigerant is drawn from the
unit’s internal storage tank and charged through the high side
(and optionally the low side) of the vehicle’s A/C system. The
screen will show the progress of this charging process.
Important! Do not disturb or bump the MAC2000 during charging
as any jarring movement can affect the charge accuracy.
Note: If an insufficient pressure differential exists between the tank
and the system, charging suspends and the MCR2000 goes into a
power-charge mode to increase tank pressure to complete the
charge. This normally occurs only when the unit has been in a very
cold environment prior to use.
6. When charging is complete, the red light and beeper signal that
the process is complete. The MAC2000 automatically goes into the
Snap-Shot mode, thus allowing a technician to obtain an after-
service snap-shot of important operating parameters of the A/C
system. Refer to Section 3.2 for details.
Instruction 2072-0400 21