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VACUUM cont.
Note: If the automobile A/C system has pressure on
it, the unit will automatically begin a recovery cycle
to insure that no refrigerant is released into the
atmosphere.
10. The 3788X SERIES will begin to evacuate the A/
C system and will beep to indicate the end of
the vacuum time.
11. Record vacuum level shown on the LCD 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.
12. Record the final vacuum level shown on the
LCD If the two recorded vacuum levels are dif-
ferent, the A/C system may have a leak and
CHARGE
The Charge Only function is designed to add a
precise amount of refrigerant when the A/C system
is low on refrigerant. This mode is most often used
when the A/C system is working but does not
produce sufficiently cold air. Note: THE A/C
SYSTEM MUST BE IN A VACUUM BEFORE THE
CHARGING PROCESS.
MODE 3 Operational Steps:
NOTE: If desired, the gauges of the 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 CHARGE option from the main menu.
3. When the LCD reads "SET CHARGE AMOUNT,"
set the amount of refrigerant to be charged into
the A/C system by using the numeric keypad
until the desired amount is shown. press ENTER
to set the charge amount on the LCD. NOTE:
To change units from pounds and ounces,
ounces or kilograms press the START key. The
unit will then ask you to confirm the charge
amount. Press the ENTER key to confirm.
4. The LCD will read "CONNECT SERVICE HOSES
TO THE VEHICLE ENTER TO CONTINUE". Press
the ENTER key.
5. Connect the high and low side auto service
hoses to the respective high and low side
service ports on the automobile A/C system.
Open the service hose valves.
6. The LCD should read "PUSH START."
might not retain refrigerant when charged.
13. 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.
14. Verify the message on the LCD reads "VACUUM
COMPLETE."
15. Press the RESET key to return to main menu.
16. Shut the service valves and disconnect the
high and low side auto service hoses from the
automobile.
Model 37889 with integrated micron gauge (Only) -
See page 9 for instructions that will outline how to
use this feature.
7. Press START key to begin charging operations.
The display will read "STABILIZING PLEASE
WAIT" The 3788X Series will then start the
charge cycle.
The LCD will display the charging process
progress. The unit will beep when desired charge
amount has been transferred to the A/C system.
NOTE: The last 3 oz. of refrigerant charge will be
metered in by the charging solenoid. It is normal to
hear a clicking sound while charging.
8. Verify the message on the LCD reads "CHARGE
COMPLETE." Press the RESET key and the Unit
will force a hose clearing routine. Close the
service valves and disconnect the high and low
side auto service hoses from the auto.
9. Press ENTER key to return to the main menu.
Low Side Charge:
The system default setting is high-side charging.
To charge low-side, follow these steps:
1. Turn the unit off.
2. Press and hold number 3 key down on the
numeric key keypad and turn the unit on.
3. When the display reads "low side charge,"
release the charge key.
4. Enter the charge amount.
NOTE: when the unit is turned off it will default
back to high-side charge.
8
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