ACS 653, ACS 663 Service Manual
SP00D00624 2021-04-08 Robert Bosch GmbH
96
Plumbing and Mechanical
These instructions outline the steps to replace
main manifold and injection manifold check
valves.
1. Depressurize the unit (select “AC unit
emptying” function in the service menu).
2. Disconnect the unit from the power source.
3. Remove the front plastic cover and service
hoses.
4. Open the service rear door.
5. Remove the rear cover (above the service
door) by pushing it up and extract it by
pulling it out.
6. Remove the faulty check valve.
1. Lubricate the O-rings on the new check
valve.
2. Install the new check valve and hand-
tighten.
3. Torque the check valve to 8-9 Nm
(70-80 in-lb).
4. Insert the rear cover so that the 4 holes on
the sides the cover t into the 4 clips on the
machine. Push down to hook the rear cover.
5. Close the service rear door.
6. Reinstall the plastic frontal cover.
7. Attach the outside high- (red) and low-side
(blue) service hoses. Tighten at 7.9 Nm
torque.
8. Connect the unit to the power source,
perform a function test, and check for leaks.
1. Depressurize the unit (select “AC unit
emptying” function in the service menu).
2. Disconnect the unit from the power source.
3. Remove the front plastic cover and service
hoses.
4. Open the service rear door.
5. Remove the rear cover (above the service
door) by pushing it up and extract it by
pulling it out.
6. Refer to Removing Solenoid on the previous
page.
7. Remove the check valve from the manifold
after removing the solenoid.
1. Lubricate the O-rings on the new check
valve.
2. Install the new check valve and hand-
tighten.
3. Torque the check valve to 17 Nm ± 1.
4. Perform the Installing Solenoid procedures
on the previous page.
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