Pre-charging the rrc770 – MAHLE RTI RRC770A User Manual
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PRE-CHARGING THE RRC770
A/C Systems requiring service often do not have a full charge of refrigerant. To avoid
unnecessary repositioning of hoses it is recommended that the RRC770 be pre-charged
until about 3 pounds of liquid refrigerant can be seen in the Internal Cylinder Sight Glass.
The Sight Glass is visible through a slotted opening on the right side of the RRC770.
Figure 1 - Pre-charging
To pre-charge the RRC770, refer to Figure 1 and follow these steps:
1. Turn the Main Power Switch to Off.
2. Connect the yellow hose from the VAPOR port of a cylinder of refrigerant to the
RRC770 Access Port on the rear of the machine.
Observe that the embossed marking on the cylinder knob says VAPOR or GAS. Do
not rely on color coding of valve knobs.
DO NOT TURN THE CYLINDER UP-SIDE-DOWN.
INTRODUCTION OF LIQUID INTO THE RRC770 MAY DAMAGE
THE COMPRESSOR AND VOID THE WARRANTY.