Bosch ACS 653 Repair Instruction page 96

Plumbing and Mechanical
Replacing Check Valve
WARNING: Disconnect the unit from
the power source before performing
service work. Incorrect use or
connections can cause electrical
shock.
WARNING: Wear safety goggles
when working with refrigerants.
Refrigerants can cause eye injury.
WARNING: Use extreme caution when
disconnecting hoses. Pressurized
refrigerant may be present in hoses.
Point hoses away from you and
anyone nearby.
Instructions
These instructions outline the steps to replace
main manifold and injection manifold check
valves.
Removing Check Valve
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.
SP00D00624 2021-04-08
ACS 653, ACS 663 Service Manual
Installing Replacement Check Valve
1. Lubricate the O-rings on the new check
valve.
2. Install the new check valve and hand-
tighten.
3. To r q u e t h e c h e c k v a l v e t o 8 - 9 N m
(70-80 in-lb).
4. Insert the rear cover so that the 4 holes on
the sides the cover fit 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.
Removing Solenoid Check Valve
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.
Installing Replacement Solenoid 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 17 Nm ± 1.
4. Perform the Installing Solenoid procedures
on the previous page.
96
Robert Bosch GmbH