Repairing Or Replacing A Solenoid - Bosch ACS 553 Service Manual

ACS 553, ACS 563 Service Manual

Repairing or Replacing a Solenoid

WARNING: Disconnect the unit from
the power source before beginning
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 repair
solenoids found throughout the unit.
Removing Solenoid
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.
4. Remove the four screws under the control
panel.
5. Tilt the control panel upwards the front of
the unit.
6. Disconnect the two wires connected to the
solenoid being repaired or replaced.
7. Remove the fastener holding the coil on the
solenoid, and remove the coil.
NOTE: Once the nut and coil on top has been
remove, a special tool (14 mm stud remover)
has to be used to dismount the plunger.
8. Remove the solenoid assembly.
9. Check the manifold block for any debris
before installing a repaired or replacement
solenoid.
Robert Bosch GmbH
Plumbing and Mechanical
Installing Solenoid
1. Lubricate the O-rings and threads on the
new solenoid assembly.
2. Install the repaired or replacement solenoid
assembly and hand tighten.
NOTE: Once the nut and coil on top has been
remove, a special tool (14 mm stud remover)
has to be used to dismount the plunger.
3. Using a torque wrench, torque the solenoid
assembly to 8.5 Nm.
4. Install the coil on the solenoid assembly,
and secure with the fastener holding the
coil in place.
5. Using a torque wrench, torque the coil
retaining bolt to 3.5 ±0.5 Nm.
6. Reconnect the wires that were disconnected
earlier when removing the faulty solenoid
assembly.
7. Tilt the control panel down and secure with
four screws.
8. Reinstall the front plastic cover.
9. Attach the outside high- (red) and low-side
(blue) service hoses. Tighten at 7.9 Nm
torque.
10. Connect the unit to the power source,
perform a function test, and check for any
leaks.
NOTE: To remove S7, S11 and S14 solenoid
valves you must loosen the 2 rear screws and
remove the 2 lateral and 2 vertical screws
(see Figure 4-4).
77
1 689 975 295 2021-04-13