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FULL CYCLE
The Full Cycle function of the 3788X is designed to
remove and recycle all refrigerant in an A/C system
by transferring the refrigerant to the storage tank,
remove moisture in the system by pulling a
vacuum, and charging the system with a precise
amount of refrigerant.
MODE 4 Operational Steps:
NOTE: If desired, the gauges of 3788X can now be
used to aid investigation of an A/C system problem.
Ensure the automobile A/C system is turned off
prior to selecting a mode on the 3788X.
1. Verify the auto air conditioning system is off.
2. Select Full Cycle in the main menu. The LCD
will read "SELECT VACUUM TIME".
3. When the LCD reads "SET VACUUM TIME," set
the vacuum time by entering the time using the
numeric keypad until the desired time is shown.
Press the ENTER key to continue.
4. When the LCD reads "SET VAC HOLD TIME,"
set the vacuum hold time by entering the time
using the numeric keypad until the desired time
is shown. Press the ENTER key to continue.
Note: We recommend 10-15 minimum vacuum time
to ensure proper charging.
NOTE: Vacuum hold time can be bypassed if the
time is set to zero.
1. When the LCD reads "SET CHARGE AMOUNT,"
set the charge amount by entering the amount
using the numeric keypad until the desired time
is shown. Press the ENTER key to continue.
6. When the LCD reads "INJECT OIL AFTER
VACUUM", use the left and right arrow keys to
toggle between YES and NO. Select YES or NO
and press the ENTER key to continue.
7. The LCD should read 'CONNECT SERVICE
HOSES TO VEHICLE',
8. Press START KEY to begin full cycle operations.
9. The unit will begin to recover as outlined for the
Recovery Only cycle, and then evacuate the A/C
system and will beep to indicate the end of the
vacuum time— if Vacuum Hold is used.
10. Record the vacuum level shown on the low
pressure gauge and press START to begin the
vacuum hold time. The hold time will count
down on the LCD and the unit will beep at the
end of the hold time. If vacuum hold time was
set to zero, the unit will transition into charge
mode.
11. Record the final vacuum level shown on the low
pressure gauge. If the two recorded levels are
different, the A/C system may have a leak and
may not retain refrigerant when charged. The
37880 will automatically start the charge cycle.
12. The unit will prompt you to "INJECT OIL NOW"
press and hold the START key until the desired
amount of oil is injected into the A/C system.
13. The LCD will display the progress of charging
process. When desired charge amount has been
transferred to the A/C system, the unit will beep.
14. Verify the message on the LCD reads "FULL
CYCLE COMPLETE."
15. Press the RESET key. The LCD should read
"CHECK OIL LEVELS." The LCD will read
"HOSES NEED CLEARING"
16. Press the Enter Key. The unit will then prompt
you to "DISCONNECT VEHICLE."
17. Shut the service valves and disconnect the
high and low side auto service hoses from the
automobile.
18. Press the ENTER key; the LCD will read
"CLEARING HOSES."
19. Measure the oil in the oil drain bottle. Dispose
of recovered oil in a proper manner.
20. Press the RESET key to return to the "SELECT
MODE" status.
INTERGRATED MICRON GUAGE (37889 MODEL
ONLY) The 37889 model has an integrated micron
gauge that can be used to determine the micron
level of the A/C system. The instructions below will
outline how to use this feature .
Full Cycle / Vacuum Operations – Select micron
level by using the up or down arrows. If you would
rather enter a time for the vacuum cycle press the
START key. Use the numeric keypad to set vacuum
time. NOTE: Because of the location of the vacuum
sensor it may be necessary to set the micron lever
lower to compensate.
NOTE: Since the micron sensor is inside the unit
and not attached to the vehicle, there will be a dif-
ference in the actual micron reading in the vehicle.
To achieve the best results set the micron number
lower than the micron level you want to reach.
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