Replacing Check Valve - Bosch ACS 553 Service Manual

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
manifold check valves.
Removing Check Valve
1. Close red and blue tank valves and
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 (if needed).
4. Remove the four screws under the control
panel.
5. Tilt the control panel upwards the front of
the unit.
6. Remove the faulty check valve.
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ACS 553, ACS 563 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. Torque the check valve to 8.5 Nm.
4. Tilt the control panel down and secure with
four screws.
5. Reinstall the front plastic cover.
6. Connect the unit to the power source,
perform a function test, and check for leaks.
Removing Solenoid Check Valve
1. Close red and blue tank valves and
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.
4. Remove the four screws under the control
panel.
5. Tilt the control panel upwards the front of
the unit.
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 ± 1 Nm.
4. Perform the Installing Solenoid procedures
on the previous page.
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Robert Bosch GmbH