MAHLE RTI RHS900 - Manual (Page 22)

- 5.8 -
Operating RHS 900
C:\RHS Computer Files\Instructions\RHS\GB\642-40\0012B-01.doc 1997.09.11
RHS 900
For further information on trouble shooting and GAS, BLOCK-ALARM etc., see
Section 7.
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It is now possible to check whether the A/C unit has been charged with the
correct quantity of refrigerant. To do this, start the unit and then read off
high and low pressure from the appropriate unit pressure gauges. The
correct pressures are given in the A/C unit supplier instructions.
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When charging is complete, wait 30 seconds before disconnecting quick-
coupling hoses from the A/C unit.
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As hoses will contain refrigerant residue, drain them by closing the service
hose valves and by pressing the process switch RECOVERY. The com-
pressor will then automatically empty refrigerant from the hoses.
NOTE:
To guarantie the charging accuracy, the charging amount lost in the service
hoses, must be compensated. The loses are depending on variables such as
length of the hoses and ambient temperature.
Automatic process
When it is not necessary to charge the A/C unit with oil, AUTOMATIC
PROCESS can be selected. Evacuation, vacuum test and refrigerant charging will
then be performed automatically:
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Set the evacuation time on the timer (pos. 25).
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Press process switch (pos. 23) AUTOMATIC.
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If pressure remains on the A/C unit, the vacuum pump will not start! If this
is the case, press RESET/TEST (pos. 26) and then RECOVERY SWITCH
(pos. 12) and wait until the compressor has built up underpressure (green
recovery lamp pos. 15 goes out). AUTOMATIC can then be reactivated.
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The required quantity of refrigerant must now be entered in the Flow Con-
trol (see description under process REFRIGERANT CHARGING).
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When evacuation is complete, a vacuum test follows automatically (leakage
test!). If within 3 minutes the vacuum stays below -0.8 bar the lamp
VACUUM OK lights up and REFRIGERANT CHARGING follows
automatically.