MAHLE RTI TC670V - Manual (Page 14)

RTI Technologies, Inc.
Page 13
EXAMPLE: The level of liquid visible in the TC670V Charging Cylinder Sight Glass is 7.4 lbs.
and the A/C system capacity is 3.2 lbs. The following calculation results...
(7.4) - (3.2) = 4.2
Therefore, the sliding indicator should be set at 4.2 lbs. in this example. When the
liquid level lowers to the 4.2 lb. mark, a charge of 3.2 lbs. 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 TC670V.
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.