Purging Residual Refrigerant; Purging Non-Condensable Gases (Ncgs) - Bosch RG8.0 Originalbetriebsanleitung

en 34 | RG8.0 / RG4.0 | Operation
6.2

Purging residual refrigerant

Upon completion of recovery as defined in
chapter 6.1.2, the RG8.0 / RG4.0 must be purged.
IN
Fig. 5: Valve positions for purging residual refrigerant
1. Ensure that the ports of the system being serviced
are closed.
2. Ensure that the inlet control valve of the
RG8.0 / RG4.0 is in the CLOSED position.
3. Ensure that the RG8.0 / RG4.0 is powered off.
4. Turn the recovery / purge (Black) knob of
RG8.0 / RG4.0 to PURGE position (pointed down-
wards) as shown in Fig. 5.
5. Start the RG8.0 / RG4.0 and slowly turn the inlet
(Blue) control valve of the RG8.0 / RG4.0 to PURGE
position as shown in Fig. 5.
 The RG8.0 / RG4.0 starts purging automatically.
6. Run until desired vacuum is achieved or until low
pressure switch cuts off the RG8.0 / RG4.0.
7. Close the valve on the recovery tank, then the outlet
control valve of the RG8.0 / RG4.0.
8. Power off the RG8.0 / RG4.0.
9. Turn the inlet control valve to the closed position.
10. Close all hose shut-off valves, then disconnect and
store the hoses.
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F 002 DG9 H00 2018-08-17
6.3 Purging Non-Condensable Gases
(NCGs)
!
This procedure may be prohibited in certain locali-
ties. Check local regulations and guidelines to deter-
mine if your location allows purging of NCGs before
performing any such procedure.
1. Keep the tank in a steady state for 24 hours which
allows NCGs to rise to top of the tank.
2. Connect a manifold gauge set to the tank.
3. Open the tank valve to which the gauge is connected
OUT
and read the pressure.
4. Determine the ambient temperature.
5. Refer to a refrigerant pressure / temperature chart.
Find the temperature on the chart and look across
to the corresponding pressure for the type of refrig-
erant in the tank. Compare how that relates to the
reading on the gauge.
6. If the pressure reading is higher than the pressure
shown on the chart, slowly open the vapour port
valve. Ensure the pressure on the pressure gauge de-
creases. To prevent venting, add 0.3 - 0.35 bar to the
pressure shown on the chart. When the gauge corre-
sponds to that pressure, close the vapour port valve.
7. Keep the tank in a steady state for 10 minutes and
check the pressure again.
8. Repeat the process if necessary.
Bosch Automotive Service Solutions GmbH