MAHLE RTI RRC770 - Manual (Page 12)

RTI Technologies, Inc.
11 September 28, 1999 Page 11
Figure 5 Charge/High Side
CHARGE/HIGH SIDE
To Charge Refrigerant, refer to Figure 5 and follow these steps:
1. Perform Hose Evacuation described previously.
2. Connect Red and Blue Hoses to the A/C System per the vehicle
manufacturer's instructions.
3. Determine the refrigerant capacity of the A/C system to be charged. This
data is usually printed on a tag located on the accumulator or under the
hood of the vehicle. Convert this quantity to tenths of a pound for setting
the RRC770 charge indicator.
The following will determine where to set the indicator prior to starting
the charge mode:
(RRC770 Liquid Level) - (A/C System Capacity) = Indicator Setting
EXAMPLE: The level of liquid visible in the RRC770 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 Glasses on the Charging Cylinders have markings for
both R12 and R134a. Always use the correct scale for accurate
charging.