ACS 753, ACS 763, ACS 863 Service Manual
SP00D00609
2018-03-26
Robert Bosch GmbH
19
Introduction
Pressure Decay Leak Test
This function is available on Function menu.
To ensure a safe, environmentally friendly,
and economic operation, the unit performs a
software-controlled self-test in regular intervals
every 10 days (for R1234yf only).
1. Follow the on-screen prompts to connect
the hose service couplers to the storage
connectors on the side of the machine.
Open the hose couplers by turning the col-
lars clockwise.
2. Select
OK
icon to start the test.
3. The machine performs a self-recovery and
displays:
RECOVER IN PROGRESS
4. The machine performs a 30-second vacuum
test and displays:
VACUUM CHECK IN PROGRESS
• If the vacuum test fails, the machine will
prompt to check for leaks.
5. Once the machine passes the vacuum test,
a controlled pressure is applied to its internal
components. The machine displays:
PRESSURE CHECK IN PROGRESS
6.
Pressure is held for five minutes and moni
-
tored for decay. Minutes and seconds count
down on the display.
• If an acceptable pressure decay is de-
tected, the machine recovers refrigerant
and returns to the Functions Menu, ready
for normal operation.
• If an unacceptable pressure decay is de-
tected, the machine will prompt to check for
leaks. Take the machine to an authorized
service center for repair.
NOTE:
Leak Check may also be selected at
any time from the Functions Menu. If you de-
cline to run the Leak Check when prompted,
the machine will continue to prompt for the test
at each power-up until the test is completed
(for R1234yf only).
Lockout
Never leave the machine live if an immediate
use is not scheduled. To ensure that unauthor-
ized personnel cannot run the machine, use the
Lockout as shown in Figure 1-10.
1. Turn the Lockout lever (1) counterclockwise
(CCW).
2. Insert a padlock or other item through the
aligned holes so the lever cannot be turned
clockwise (CW) to start the machine.
1
abc
def
jkl
mno
tuv
wxyz
ghi
pqrs
Figure 1-10. Lockout
