Refrigerant Recovery

Important
^ Use only the 23 kg (50-pound) unit refrigerant tank (J 39500-50) designed for the (ACR4). The unit overfill limitation mechanism has been calibrated specifically for use with this tank, and the tank valving is set up specifically for use with the unit.
^ Connect battery charger to vehicle battery to prevent battery drain.

1. Attach the high-side (red) hose with the quick disconnect coupler to the high-side refrigerant service valve fitting of the vehicle A/C system. This valve is located in the receiver dehydrator tube, between the receiver and dehydrator and the condenser. Open the coupler valve after attachment.
2. Attach the low-side (blue) hose with the quick disconnect coupler to the low-side refrigerant charge valve fitting of the vehicle A/C system. This valve is located in the compressor and condenser hose, between the compressor and the expansion (orifice) tube. Open the coupler valve after attachment.
3. Check the high-side and low-side gages on the unit control panel to be sure the A/C system has pressure. If there is no pressure, there is no refrigerant in the system to recover.

Important
^ If there is no refrigerant in the A/C system, do not continue with the recovery operation. Air will be drawn into the recovery tank.

4. Open both the high-side and the low-side valves on the control panel.
5. Open both the red "LIQUID" and the blue "GAS" (vapor) valves on the tank.
6. Slowly open the oil drain valve to see if the oil separator contains oil.
^ If any oil drains into the catch bottle at the bottom of the unit, allow it to drain until there is no more oil in the separator.
7. Close the oil drain valve.
^ Dispose of the oil in the catch bottle in an appropriate manner and return the bottle to its place on the unit.
8. Plug the unit into the proper voltage outlet and turn on the "MAIN POWER" switch.
9. Start engine and run for one minute with A/C system "ON" in order to stabilize system.
10. Turn ignition switch "OFF" then back to "RUN" and blower motor to "HIGH." A battery charger should be connected to prevent battery drain.

Important
^ Blower motor setting to "HIGH" will increase the rate at which refrigerant can be recovered.

11. Press "RECOVER" on the keypad. Before recovery begins, the unit will clear itself of refrigerant. "CL-L" will appear on the display. The cleaning process takes from thirty seconds to three minutes to complete.

Important
^ Maintain A/C blower motor on "HIGH" during recovery operation.

12. When cleaning is complete. The unit will automatically start recovery, and the control panel display will show the unit is in the "RECOVER" mode of the "AUTOMATIC" cycle. Also, the weight of refrigerant being recovered will be displayed.
13. The compressor shuts off automatically when initial recovery has occurred, at approximately 57 kPa (17 inches Hg) vacuum.
14. At the end of the initial recovery process, the display shows "CPL" and then alternately flashes the weight of refrigerant recovered and "OIL/OZ" ("OIL/GMS").

Important
^ A small amount of A/C system lubricating oil polyalkylene glycol (PAG) might be removed with the refrigerant during recovery. The amount of oil removed (often there will be none) will vary greatly depending on a variety of conditions of the vehicle being serviced. The (ACR4) separates the oil from the refrigerant.
^ The "OIL/OZ" ("OIL/GMS") flashing is a reminder to always drain the recovered oil at this time. The same amount of oil must be replaced in to the A/C system later when the system is recharged with refrigerant.

15. Slowly open the oil drain valve and drain the oil into the calibrated oil catch bottle at the bottom of the unit.
16. After the oil is completely drained, close the valve.
17. Read and record the amount of oil removed in the catch bottle.
18. Dispose of the recovered oil in an appropriate manner Never reuse this oil.
19. Check the control panel "LOW-SIDE GAGE."
^ If the A/C system has maintained a vacuum, the recovery is complete.
20. If the "LOW-SIDE GAGE" pressure rises above "0" this indicates the presence of more refrigerant in the system. In this case, press the "HOLD/CONT" key on the keypad to recover the additional refrigerant. Repeat this step as needed until the system maintains vacuum for two minutes.

Important
^ If the display flashes "FULL" during the recovery process, and the unit shuts off, the unit tank is full.
^ An empty unit tank (J 39500-50) must be installed to accommodate additional refrigerant, before proceeding to the next step in the recovery operation. Do not use any other kind of tank.
^ it is possible to lower the amount of refrigerant in the unit tank by charging other vehicles.

Evacuation

Make sure the unit tank has sufficient R-134a refrigerant for charging. Simultaneously press "RESET" and "ENTER" to enter the diagnostic mode. Then press "6" The display must show 16 kg (36 pounds) or more. If less than 16 kg (36 pounds) is displayed, add new refrigerant to the tank. See the manufacturer instructions for this procedure.

1. With the high side and low side hoses connected to the vehicle A/C system, open both the high-side (red) and the low-side (blue) valves on the unit control panel.
2. Open both the (red) "LIQUID" and the (blue) "GAS" vapor valves on the tank.

Important
^ To remove all the air and properly dry the A/C system, the unit automatically goes to a preprogrammed evacuation time.
^ It is possible to evacuate longer. Press keys to enter time desired. New entry will show on the display. Press "ENTER" the display will blink indicating input of data.

3. Press "VACUUM" to start the vacuum pump. The display counts down the vacuum time to zero to indicate operation time remaining. The display reads "RECYCLE" five seconds after the vacuum pump starts and continues while the process takes place.

Important
^ Automatic refrigerant recycling during each evacuation is a feature of the (ACR4). No action is required by the technician.
^ The control panel "MOISTURE INDICATOR" must be green during recycling verifying refrigerant moisture content is within specifications. Yellow indicates a set condition requiring a filter/drier cartridge change. See the manufacturer instructions for this procedure.
^ Noncondensable gases (mostly air) are automatically vented from the tank during the recycling process. An audible sound of pressure release may be heard as this happens. This is a normal function.

4. At approximately the 12-minute mark on the display (pump has run for three minutes), press "HOLD/CONT" key to stop vacuum pump.
A. A "0" vacuum reading indicates a major system leak. Repair leak and restart evacuation procedure.
B. If a vacuum reading of 91-101 kPa (27-30 inches of Hg) is indicated, close the low-side and high-side valves. Observe the vacuum level for a few minutes as a leak check of the A/C system. If vacuum is not maintained, find and repair the A/C system leak before continuing.
C. If a vacuum reading of 91-101 kPa (27-30 inches of Hg) is maintained, open the high-side and low-side valves and press the "HOLD/CONT" key to restart the vacuum pump.

5. When the vacuum sequence has run the programmed time, the display shows "CPL" to indicate that evacuation is complete.

Important
^ The vacuum pump oil must be changed frequently.
^ When the pump has run for a total time of ten hours, the message "OIL" will flash on the control panel display as a reminder to change the oil.
^ If the "OIL" warning flashes during operation, press "CONT" and change the oil before the next operation. See the manufacturer instructions for this procedure.