MAHLE RTI TC640 - Manual (Page 13)

RTI Technologies, Inc.
September 15, 1997 Page 12
EXAMPLE: The level of liquid visible in the TC640 Charging Cylinder Sight
Glass is 3.4Kg and the A/C system capacity is 2.0Kg. The following
calculation results...
(3.4) - (2.0) = 1.4
Therefore, the sliding indicator should be set at 1.4Kg in this
example. When the liquid level lowers to the 1.4Kg mark, a
charge of 2.0Kg will have been delivered
NOTE... The Sight Glass on the Charging Cylinder has markings for
both R12 and R134a. Always use the correct scale for
accurate charging.
6. Open Red Hose Valve. Do not start the Vehicle's Engine. Refrigerant
will flow into the high side of the A/C System. Closely monitor the liquid
level as it lowers in the Charging Cylinder Sight Glass.
7. Close High Gauge Valve as soon as the refrigerant level drops to the
sliding indicator.
9. Press bottom (OFF) of rocker switch marked CHARGE/HIGH SIDE.
The vehicle can now be started and the A/C system checked by monitoring Gauge
pressures.
Evacuate the hoses per the preceding section "Hose Evacuation"
Always close all valves before disconnecting hoses.
NOTE: The preceding is the recommended method of charging with the
TC640.
Some vehicle manufacturers may specify connecting only to the
Low Side of the A/C System. Always follow the manufacturer’s
recommended procedures. The above instructions would have to
be modified accordingly.