Robinair 34134-2K Refrigerant Recovery, Recycle, Recharge Unit - Manual (Page 12)

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© 2000 Robinair, SPX Corporation
Operating Instructions
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RECHARGING THE A/C SYSTEM
To recharge A/C system:
1. Connect the high side and low side hoses to the A/C system according to its
manufacturer's recommendations for charging. Open appropriate service
coupler and manifold valve(s).
2. Verify both tank valves are open.
3. Press TARE button until “00.00” weight is displayed.
4. Determine the amount of charge needed from the vehicle nameplate. Press
and hold the CHARGE button until the desired weight charge is indicated on
the display. Release the CHARGE button.
5. Close both manifold valves.
6. Start the vehicle's engine and turn on the A/C system for maximum cooling.
Let it run until the gauge pressure readings stabilize. Compare the gauge
readings with the system manufacturer's specifications.
7. Check the evaporator outlet temperature to be sure that the A/C system is
operating correctly. Refer to the system manufacturer's specifications for the
correct temperature.
8. Turn off the vehicle's engine.
9. Close the high side coupler valve, then disconnect the high side hose from the
A/C system.
10. Restart the vehicle, then open both valves on the manifold. Refrigerant from
both hoses will be drawn quickly into the A/C system through the low side
hose.
11. Close the low side coupler valve, then disconnect the low side hose from the
A/C system.
12. Turn off the vehicle engine.
13. Close both manifold valves.
NOTE: If using the optional heating blanket, make sure the blanket is far enough away
from the temperature probe not to interfere with temperature probe accuracy.
AIR PURGE
The gauge on the control panel shows when to purge air from the tank. To purge
non-condensables:
1. Check the TEMPERATURE display (see page 4) to find the temperature of
the refrigerant in the unit tank.
2. Use this temperature to find the correct pressure for the refrigerant on the
appropriate pressure/temperature chart on the control panel.
3. Compare the pressure from the chart to the reading on the tank pressure
gauge.
4. If the pressure exceeds the target pressure by more than 10 psi (0.7 Bar), press
the air purge button for approximately 30 seconds.
5. Check tank pressure and repeat steps as necessary.