Leak Check; Oil Inject Adjust - Bosch ACS 661 Manual Original

en 50 | ACS 661 | Maintenance
6.10

Leak Check

To ensure a safe, environmentally friendly, and econom-
ic operation, the unit performs a software-controlled
self-test in regular intervals (every 10 days). During this
test, the components containing refrigerant are pres-
surized and monitored for pressure decay, which could
indicate a leak.
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At startup, if a Leak Check is required, the ACS 661
displays Connect hoses to storage ports
and open valves
1. Connect the service hose couplings to the storage
ports at the rear of the ACS 661.
2. Open the couplings by turning the collars clockwise.
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Leak Check may also be selected at any time from
the Setup Menu. If you decline to run the Leak
Check when prompted, the ACS 661 will continue to
prompt for the test at each power-up until the test is
completed.
3. Open the high-side and low-side panel valves on the
ACS 661's control panel.
4. Press F1 to start.
 The ACS 661 performs a self-recovery and dis-
plays Recover in progress
 The ACS 661 performs a 30-second vacuum test
Vacuum check in progress
and displays
 If the vacuum test fails, the ACS 661 will prompt
to check for leaks.
 Once the ACS 661 passes the vacuum test, a con-
trolled pressure is applied to its internal compo-
nents. The ACS 661 displays
in progress
 Pressure is held for five minutes and monitored
for decay. Minutes and seconds count down on
the display.
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If an acceptable pressure decay is detected,
ACS 661 recovers refrigerant and returns to the
Setup Menu, ready for normal operation.
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If an unacceptable pressure decay is detected,
ACS 661 will prompt to check for leaks. Take the
ACS 661 to Bosch for repair.
WARNING: To prevent personal injury
should the ACS 661 require transport to a
local Bosch service center, follow local gov-
ernment regulations regarding transporta-
tion of equipment containing R1234yf.
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SP00D00171 2019-07-02
6.11
The oil inject functionality in this ACS 661 is automatic
and timing-based. Many variables can affect the accu-
racy.
If you are using very high or low viscosity oils, or if you
are operating at very high or low ambient temperatures,
an adjustment of the oil inject correction factor may
be necessary for the ACS 661 to produce accurate oil
injections.
!
!
Oil
PAG/POE 46
PAG/POE 100
PAG/POE 125
PAG/POE 150
Pressure check
The default correction is set at 0.38 and is based on a
PAG/POE 100 oil viscosity and a 25°C ambient tempera-
ture.
1. Select Oil Inject Adjust from the Setup Menu to
2. Enter in a desired correction factor.
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3. Press F1 to save the value.
4. Press F2 to return to the Setup Menu without saving

Oil Inject Adjust

Pay attention on using the proper fresh oil (PAG or
POE) depending on vehicle under service.
Oil injection is timed and not based on a scale
reading. To preserve accuracy, depending on oil
type to be injected and the ambient temperature the
ACS unit is operating, a correction factor has to be
entered referring to the following table.
10 15
0,50 0,31
1,17 0,69
1,34 0,79
1,50 0,89
CAUTION: To avoid chemical incompatibil-
ities with the internal components of the
ACS 661, use only oils approved by the
vehicle manufacturer. Problems resulting
from the use of non-approved oils will can-
cel the warranty.
adjust the correction factor of Oil Inject.
 The ACS 661 displays
X.XX increase to in-
ject more oil or decrease to inject
less oil
Acceptable values consist of any number between
0.01 and 1.00.
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A correction factor of 1.00 lengthens the oil
inject duration time, increasing the amount of oil
injected.
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A correction factor of 0.01 shortens the oil inject
duration time, decreasing the amount of oil
injected.
the value.
Temperature
20 25 30 35
0,23 0,19 0,15 0,13
0,49 0,38 0,30 0,25
0,55 0,42 0,33 0,28
0,62 0,46 0,37 0,30
Robert Bosch GmbH