Vehicle Damage Warnings
RECOVERY/RECYCLING EQUIPMENTFollow the manufacturer's instructions for machine operation and machine maintenance. Never introduce any refrigerant other than that specified into the machine.
ELECTRONIC LEAK DETECTOR
Follow the manufacturer's instructions for tester operation and tester maintenance.
VACUUM PUMP
The lubricating oil contained inside the vacuum pump is not compatible with the specified lubricant for R-134a A/C systems. The vent side of the vacuum pump is exposed to atmospheric pressure. Therefore, if the pump is switched off after evacuation the lubricating oil may migrate into the hose. To prevent this, isolate the pump from the hose after evacuation (vacuuming).
This migration is avoided by placing a manual shut-off valve near the hose-to-pump connection, as follows:
^ Usually vacuum pumps have a manual isolator valve as part of the pump. Close this valve to isolate the service hose from the pump.
^ For pumps without an isolator valve, use a hose equipped with a manual shut-off valve near the pump end. Close the valve to isolate the hose from the pump.
^ If the hose has an automatic shut-off valve, disconnect the hose from the pump. As long as the hose is connected, the valve is open and lubricating oil may migrate.
Some one-way valves open when vacuum is applied and close under a no vacuum condition. Such valves may restrict the pump's ability to pull a deep vacuum and are not recommended.
MANIFOLD GAUGE SET
Be sure the gauge set has 1/2"-16 ACME threaded connections for service hoses. Confirm the set has been used only with refrigerant R-134a along with specified lubricants.
SERVICE HOSES
Be certain that the service hoses display the markings described (colored hose with black stripe). Be certain that all hoses include positive shut-off devices (either manual or automatic) near the end of the hoses opposite the manifold gauge.
SERVICE COUPLERS
Never attempt to connect R-134a service couplers to a CFC-12 (R-12) A/C system. The R-134a couplers will not properly connect to the CFC-12 (R-12) system. However, if an improper connection is attempted, discharging and contamination can occur.
REFRIGERANT WEIGHT SCALE
When using a scale which controls refrigerant flow electronically, assure the following:
^ Hose fitting size is 1/2"-16 ACME
^ No refrigerant other than R-1 34a (along with specified lubricant) has been used with the scale.
Calibration
Calibrate the scale every 3 months.
To calibrate the weight scale on the ACR4 (J-39500):
1. Press Shift/Reset and Enter at the same time.
2. Press 8787. "A1" will be displayed.
3. Remove all weight from the scale.
4. Press 0, then press Enter. "0.00" will be displayed and change to "A2."
5. Place a known weight (dumbbell or similar weight), between 10 and 80 lbs., on the center of the weight scale.
6. Enter the known weight using 4 digits. (Example 10 lbs=10.00,10.5 lbs=10.50)
7. Press Enter-the display returns to the vacuum mode.
8. Press Shift/Reset and Enter at the same time.
9. Press 6-the known weight on the scale is displayed.
10. Remove the known weight from the scale. "0.00" will be displayed.
11. Press Shift/Reset to return the ACR4 to the program mode.
CHARGING CYLINDER
Using a charging cylinder is not recommended. Refrigerant may be vented into the air through the cylinder's top valve when filling the cylinder.