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Initial Setup
To ensure quick, successful integration of the re-
covery machine into your shop, please follow these
set-up procedures before the first use of the unit.
Step 1: FILL VACUUM PUMP WITH OIL
1. Remove thumbscrews located under the vacu-
um pump shelf.
2. Rotate the front of the vacuum pump out to ex-
pose the oil fill port.
3. Remove the fill cap located on top of the vacu-
um pump.
4. Using a funnel, insert oil to the oil level line us-
ing the provided YELLOW JACKET
pump oil.
5. Replace the oil fill cap.
6. Rotate the vacuum pump back into its original
position and replace the thumbscrews.
Step 2: FILL SOURCE TANK WITH REFRIGERANT
(also see page 11)
1. Disconnect blue tank hose from tank.
RECOVER
The Recovery Option should be used to fully recovery
and recycle all refrigerant from an air conditioning
system. For instance, if the system needs to be
opened to atmosphere to replace a part, all refrigerant
must be removed before opening the system.
RECOVER Operational Steps:
1. Verify the automobile air conditioning system
is off.
2. Select RECOVER for recovery operations. The
LCD should read "CONNECT SERVICE HOSES
TO VEHICLE ENTER TO CONTINUE."
NOTE: If desired, the gauges of the 3788X SERIES
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 machine.
3. Connect the high and low side auto service
hoses to the respective high and low side ser-
vice ports on the automobile A/C system. Open
the service hose valves.
4. Press START to begin recovery operations.
WARNING: DO NOT RECOVER CONTAMINATED
REFRIGERANT WITH THIS UNIT. RECOVERING
CONTAMINATED REFRIGERANT WILL VOID ALL
WARRANTIES AND MAY CAUSE DAMAGE TO OTHER
AUTOMOBILES SERVICED IN THE FUTURE.
During the recovery operation, refrigerant is removed
from both the high and low side of the automobile air
conditioning system. The LCD will display the amount
of refrigerant being recovered and the status line will
2. Open blue tank valve and allow nitrogen to vent.
3. Reconnect blue tank hose.
4. Attach the tank refill adapter (Part No. 19153) to
the R-134a virgin cylinder. WARNING: DO NOT
OVER-TIGHTEN THE TANK REFILL ADAPTER.
5. Plug unit into a grounded 110V outlet.
6. Turn on the main power switch.
7. Select TANK REFIL from the main menu
8. Follow the user prompts to complete the tank
refill process.
9. When the display reads "SUPPLY TANK EMP-
TY" disconnect blue hose.
®
vacuum
10. Remove the tank refill adapter from empty R-
134a virgin cylinder and place it in the tool tray
located on top of the unit.
The unit is now ready for operation.
View Training Video:
https://yellowjacket.com/product/refrigerant-
management-system-3788x/
read "RECOVERING REFRIGERANT."
Note: If "RECOVERY HOLD" Option is selected The
unit will stop at 6" of mercury and hold for five min as
required by EPA Per SAE J2211. If the pressure rises
to 0 psi the compressor will restart and the unit will
pull down to the required 6" of mercury and hold for
two minutes. The unit will repeat this process until the
system pressure remains stable at vacuum for two
minutes or until it fails this process five times. If the
process fails five times the status line will read "LEAK
CHECK FAILED." This may mean that the automobile
A/C system has a gross leak and it will not hold a vac-
uum.
If this occurs take the appropriate steps to locate the
leak and properly repair it.
If the "RECOVERY HOLD" option is not selected the
unit will shut off at the required level of vacuum and
the operator must insure that the EPA standard (SAE
J2211) is met.
After the system turns off, the unit will beep to alert
the technician the job is complete. The oil removed
from the auto will drain into the oil drain bottle on the
side of the unit. Because a small amount of gas will be
released as the oil drains, a small hissing sound may
come from the bottle.
Always inspect hoses, o-rings, and fittings for dam-
age before using equipment. Replace worn or dam-
aged components. Failure to insure that hoses, o-
rings and fittings are in working order can increase a
build-up of NCG's in the recovered refrigerant.
6
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