Bosch RG8.0 Original Instructions Manual page 12

4. Connect the RG8.0 / RG4.0 to the system being ser-
viced according to Fig. 3. Follow the order outlined
below. Use only designated refrigerant hoses that
meet local regulations. It is strongly recommended
to use hoses with manual shutoff valves on one end,
and these instructions are written for such hoses.
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Always use a service manifold gauge set between
the A/C or refrigeration system, recovery unit and
auxiliary device(s).
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Ensure that air has been removed from the hoses
and the RG8.0 / RG4.0.
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Connect a hose with the shut-off valve end to the
low side (vapour) service port of the A/C or re-
frigeration system and the other end to the low
side port of the manifold gauge set.
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Connect a hose with the shut-off valve end to the
high side (liquid) service port of the A/C or refrig-
eration system and the other end to the high side
port of the manifold gauge set.
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Connect the utility port of the manifold gauge set
to the recovery unit inlet fitting, with the shut-off
valve end of the hose at the machine inlet, ensur-
ing that an inline filter drier is used.
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Connect an approved refrigerant recovery tank
to the outlet port of the RG8.0 / RG4.0 with the
shut-off valve end of the hose at the tank, and
place the tank on an appropriate weighing scale.
If the tank has two valves / ports, one for liquid
and one for vapour, connect to the liquid port.
5. Open the A/C or refrigeration system's low side
(vapour) and high side (liquid) service ports and the
shut-off valves on the hoses connected to the mani-
fold gauge set. Always open valves slowly to check
hoses and connections for leaks.
6. Open the manifold gauge set (blue) low side valve
and the shut-off valve on the hose to the inlet port of
the RG8.0 / RG4.0.
7. Open the inlet valve (blue) of the RG8.0 / RG4.0
fully, by rotating the knob counter-clockwise, that is
to the VAPOUR position.
8. Open the outlet valve (red) of the RG8.0 / RG4.0
fully.
9. Open the shut-off valve on the hose connected to
the recovery tank and then open the recovery tank
valve (only the one connected to the RG8.0 / RG4.0).
Bosch Automotive Service Solutions GmbH
Operation | RG8.0 / RG4.0 | 31
10. If there is pressure differential between the A/C
or refrigeration system and the tank, refrigerant
vapour will begin to flow.
11. Turn the recovery machine Inlet (blue) control valve
to the LIQUID marking on the front panel, refer to
Fig 2. Rotate the Master Switch to the ON position
to start the recovery.
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If you have trouble starting or re-starting the
RG8.0 / RG4.0 due to high head pressure, first
power off the unit. Close the inlet valve and then
slowly turn the inlet valve towards the PURGE posi-
tion until the inlet pressure rises. Close the inlet
valve again and re-start RG8.0 / RG4.0.
12. Slowly open the manifold gauge set high side (red)
valve, and close the manifold gauge set low side
(blue) valve.
13. Liquid refrigerant should begin to flow. If knock-
ing or hammering is heard, throttle back the blue
inlet valve (towards the closed position) of the
RG8.0 / RG4.0. Running the RG8.0 / RG4.0 with the
valve open too far during liquid recovery may cause
knocking / hammering and possible damage to the
RG8.0 / RG4.0.
14. Once all liquid has been transferred from the A/C
or refrigeration system to the recovery tank, and
only vapour is being recovered, the inlet (blue)
valve of the RG8.0 / RG4.0 may be opened fully,
and the blue low side valve of the manifold may be
opened again to speed the remaining recovery.
15. Continue recovery until satisfactory vacuum level
has been reached. The RG8.0 / RG4.0 will cut-off
automatically when inlet pressure reaches mini-
mum required vacuum.
16. Upon completion of recovery:
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Close the A/C or refrigeration system service
valves and shut-off valves on the connected
hoses.
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Close the manifold service valves.
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Close the inlet (blue) valve on the RG8.0 / RG4.0.
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Switch off the RG8.0 / RG4.0.
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Proceed to purge RG8.0 / RG4.0 as directed in
chapter 6.2.
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The RG8.0 / RG4.0 is equipped with a vacuum
switch which will cut-off the RG8.0 / RG4.0 auto-
matically when inlet valve is closed or inlet pressure
reaches minimum required vacuum.
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F 002 DG9 H00 2018-08-17