MAHLE RTI RHS680 - Manual (Page 4)

Page 2
INTRODUCTION TO THE RHS680
The RHS680 is a complete refrigerant management center featuring state-of-the-art electronic control
with digital weight scale measuring of refrigerant. Operation of the RHS680 is intuitive and very easy
to master.
Following is an overview of the operation and features of the RHS680:
RECOVER (RECYCLE)
Refrigerant is recovered from the A/C, impurities (particulates, oil, moisture and air) are removed
and the refrigerant is stored in the internal cylinder. The recovery process stops when the RHS680
senses an 8 InHg vacuum at the A/C. Wait for at least two minutes and watch the pressure gauges
to determine if there is an increasing pressure. If pressure in the A/C rises during this time period
due to vaporization of residual liquid refrigerant, the RHS680 will restart to recover this refrigerant.
When the RHS680 stays off continually for at least two minutes, the recovery procedure is
complete.
VACUUM
A deep vacuum should be drawn on the A/C to remove air, moisture and refrigerant dissolved in
the oil. A deep vacuum is especially important if the A/C was opened for replacement of
components.
PURGE AIR - DRAIN OIL
Excess air and recovered oil must be removed from the RHS680 after all refrigerant has been
recovered from the A/C. Temperature and pressure readings are examined and air is released
using the purge valve. Oil is drained into the oil drain cup for measuring to determine the need to
replenish the A/C.
CHARGE
Refrigerant is charged into the A/C by weight. The amount to be charged is entered and the
RHS680 automatically charges the refrigerant into the A/C.
1 Keypad
2 Function Valve
3 Purge Chart
4 Gauge Manifold
5 Tool Tray
6 Purge Gauge
7 Purge Valve