MAHLE RTI RHS900 - Manual (Page 18)

- 5.4 -
Operating RHS 900
C:\RHS Computer Files\Instructions\RHS\GB\642-40\0012B-01.doc 1997.09.11
RHS 900
- The recovery and recycling time can be read from the FLOW CONTROL
display.
-
If the A/C unit requires oil charging, the process sequence must be
EVACUATION, OIL CHARGING and REFRIGERANT CHARGING. If
oil replenishment is not necessary, AUTOMATIC PROCESS (page 5.8) can
be selected.
Evacuation
-
Set the evacuation time on the timer (pos. 25).
-
Press process switch (pos. 24) EVACUATION.
-
If overpressure remains in the A/C unit, the vacuum pump will not start. If
this is the case, press RESET/TEST and then the RECOVERY switch. Now
wait until the compressor has created underpressure. The RECOVERY lamp
(pos. 15) will go out and EVACUATION must be pressed again.
-
After evacuation is complete, a vacuum test follows automatically (leakage
test). If for a period of 3 minutes the vacuum remains lower than -0.8 bar,
the white lamp VACUUM OK lights up.
If the vacuum rises above -0.8 bar, the yellow lamp (pos. 19) lights up to
indicate VACUUM FAULT. If this is the case the leakage must be located
and repaired.
IMPORTANT! If the evacuation time selected is too short, the oil in the A/C
unit may still contain a small quantity of refrigerant. During vacuum test
such refrigerant might cause a vacuum fault even though no leakage exists.
Thus always evacuate minimum 30 minutes.