Filling of A/C System In Car With Refrigerant From RHS 850

Before commencing work, read and observe Safety Precautions when working on A/C systems. Service Precautions Also read General Information on repair and replacement of A/C system components. General Information On Repair





Check specifications for details of A/C system refrigerant capacity. Also check that drainage unit reservoir (13) contains sufficient refrigerant.


NOTE: High-pressure connection (9) must be used when filling the RHS 850 with R134a from an external gas bottle. This may be carried out while the A/C system in the car is being drained through low-pressure connection.


Use rubber ring on gauge glass (13) to indicate amount of refrigerant to be transferred to A/C system in car.

NOTE: 50 ml (0.052 US qt.) must be added to the quantity indicated on the gauge glass to allow for the unit piping and the filler hose between the unit and filling connection in the car.





Set selector switch (2) to CHARGING (filling).
Upper cock (7) should be closed and lower cock (8) open. Monitor level in gauge glass (13). Close service valve cock (by turning counterclockwise) when marked level has been reached.

This means that valve is released and will not activate Schraeder valve in car.




Set selector switch (2) to RECOVERY.
Close cock (8). Open cock (7).
Wait until lamp (4) is extinguished. Hose is now clear of refrigerant.


NOTE: Gauge glass may indicate more than 50 ml (0.052 US qt.) when selector switch is set to RECOVERY. This is normal since refrigerant will normally enter the glass from the unit condenser.


Close cock (7).
Set selector switch (2) to TEST
Disconnect hose from service valve.
Open MAIN SWITCH (1).


NOTE: Use leak detector 951 1207 to carry out additional leakage test on the connections of components which have been replaced.


WARNING: Mixtures of R134a and compressed air must not be used for troubleshooting due to the risk of explosion at high pressures and temperatures.