MAHLE RTI TC640 - Manual (Page 8)

RTI Technologies, Inc.
September 15, 1997 Page 7
... NOTE ...
As refrigerant is processed by the TC640, temperature variations can
cause vapor to change to liquid which may temporarily settle in
various internal components.
If a known amount of refrigerant has been introduced into the TC640
it may not all be seen in the Charging Cylinder Sight Glass.
This is normal and nothing to be concerned about. Refrigerant has not
been lost.
The sight glass does not indicate the amount of refrigerant
recovered. It is only accurate for determining the amount of
refrigerant charged out to the vehicle A/C System while in the Charge
Mode of operation.
A small quantity of Liquid refrigerant will probably still remain in the A/C
System. This can be detected by observing an increasing pressure reading on
the Low Side Gauge.
The Low Side Gauge should remain at a stable vacuum level for at least 2
minutes before removing the hoses from the A/C system.
Turn the TC640 back on again if the Low Side Gauge goes above 0 bar. Repeat
this process until a stable vacuum is reached.
5. Close Red and Blue Hose Valves.
6. Close High and Low Gauge Valves.
7. Press bottom (OFF) of rocker switch marked RECOVER/RECYCLE.
PURGE REQUIRED OR CYLINDER FULL LIGHT:
This Light will illuminate if either...
1) The Charging Cylinder has filled to capacity: Go to Page 12.
OR
2) Pressure on the Purge Gauge approaches 17 bar: Go to Page 9.