MAHLE RTI RHS700 - Manual (Page 12)

- 6.1 -
Recovery/recycling
C:\RHS Computer Files\Instructions\RHS\GB\645-40\0009A-01.doc 1997.03.26
RHS 700
When an A/C unit is to be repaired or serviced, the RECOVERY/RECYCLING
process must be used in order to drain refrigerant from the A/C unit.
1. Make sure that all valves are closed, then connect high and low-pressure hoses
to the A/C unit and open the service couplings.
1. Switch on the main switch
and the RECOVERY/RECYCLING
process switch
2. Open valves 1 and 2. Provided there is pressure/refrigerant in the A/C unit, it
will be automatically emptied by RHS 700. The green lamp in the RE-
COVERY/RECYCLING process switch remains on until the process is
complete.
3. When the green lamp goes out for the first time, wait 5 minutes to ensure that
the A/C unit is completely empty.
1. As soon as the charging cylinder becomes full during the RECOVERY/RE-
CYCLING process, RHS 700 stops and the yellow CYLINDER
FULL lamp lights up. The charging cylinder must then be emptied
into an A/C unit or a refrigerant cylinder before the process can be continued.
See description in the section CHARGING.
2. During the RECOVERY/RECYCLING process, oil might be drained from
the A/C unit. This oil can be tapped from oil drain valve (23) into the
accompanying measuring beaker. The A/C unit must be replenished with a
corresponding amount of oil. Follow the supplier’s instructions and use only
the specified oil type.
3. The internal cylinder is charged by connecting the service hose between
refrigerant cylinder and low-pressure stub (blue). Open the gas valve on the
refrigerant cylinder (charge only on the gas phase). Follow the instructions,
points 1, 2 and 3, until the required amount of refrigerant in the internal
cylinder has been reached. Close the gas valve on the cylinder again. When the
green RECOVERY/RECYCLING lamp goes out the process has been
completed. Close valves 1 and 2 and disconnect service hose.
Note:
Sometimes it can be an advantage to recover from the low-pressure side only, for
then no oil is drained from the A/C unit. However, if this method is used make
sure that valve 2 is kept closed.