Bosch RG8.0 - Internal Leak Test

F 002 DG9 H00 2018-08-17| Bosch Automotive Service Solutions GmbH
36 | RG8.0 / RG4.0 | Troubleshootingen
Symptom /
Problem
Checklist
Cause/Action
Poor
recovery rate
Check inlet (A/Corre-
frigeration sys-
tem) pressure
Observe pressure on
inlet gauge (Blue).
If A/Correfrigeration
system has
normal pressure,
proceed to the
next step.
Check basic operation
Close the
RG8.0 / RG4.0
inlet valve. If the
RG8.0 / RG4.0
pulls into vacuum
and shuts-off, pro-
ceed to next step.
Check for leaks
in hoses and con-
nections
Open the
RG8.0 / RG4.0
inlet valve, close on-
ly A/C or refrigeration
system service valves.
If RG8.0 / RG4.0 pulls
down to Vacuum pro-
ceed to next step.
Check Internal sys-
tem leakage.
Perform internal leak
test as
described in the
section7.2
The internal leak
test fails.
Contact Bosch cus-
tomer service.
Symptom /
Problem
Checklist
Cause/Action
The
RG8.0 / RG4.0
does not re-
cover refriger-
ant even though
it is running
Make sure that
black knob on the
RG8.0 / RG4.0 is in
RECOVER posi-
tion (pointing up).
If not, close the
RG8.0 / RG4.0
inlet valve, and when
RG8.0 / RG4.0 shuts
off (LP cut-out), slow-
ly move knob to
RECOVER position.
Check for obstruc-
tions and / or freeze
up in inlet line.
Close the
RG8.0 / RG4.0
inlet valve and allow
the RG8.0 / RG4.0
to shut-off (LP cut-
out activation). Fol-
low the instructions
in chapter 6.2 for
purging refrigerant
Check pressure differ-
ential between inlet
gauge and
manifold gauge.
If there is a pressure
differential, the inlet
filter is blocked or the
inlet mesh screen is
blocked. Could be ice
or dirt. Follow instruc-
tions for purging the
RG8.0 / RG4.0, then
proceed to next step
Visually inspect
inlet filter
adapter and
filter drier for
obstructions
Replace and re-
assemble filters.
Test basic opera-
tion as described
in the section 7.1.
The hoses connecte-
to the RG8.0 / RG4.0
have no obstruc-
tions - the basic op-
eration test fails
Contact Bosch cus-
tomer service.
7.2 Internal leak test
In the event that internal leakage is suspected the fol-
lowing test can be performed to confirm or deny.
1. With nothing connected to the RG8.0 / RG4.0, en-
sure the recovery / purge valve is in the RECOVER
position.
2. Open the inlet valve and close the outlet valve.
3. Start the RG8.0 / RG4.0 and allow it to run until it
shuts off due to HP cut-out.
4. Close the inlet valve. Blue gauge should indicate zero
bar and high approximately 38.5bar.
5. Slowly turn the recovery / purge valve from
RECOVER to PURGE position.
 The pressure should drop on the red gauge and
rise on the blue gauge, settling at approximately
equal values.
 Note the values and watch the gauges for change
over the next 30 seconds. If there is no significant
pressure drop on either side, the internal
integrity is confirmed.