Replacement Isv Assembly - Bosch ACS 553 Service Manual

Plumbing and Mechanical

Replacement ISV Assembly

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
w h e n d i s c o n n e c t i n g h o s e s .
Pressurized refrigerant may be
present in hoses. Point hoses away
from you and anyone nearby.
Instructions
These instructions outline the steps to replace
the ISV assembly.
Removing ISV Assembly
1. Remove the front plastic cover.
2. Close red and blue tank valves and
depressurize the unit (select "AC unit
emptying" function in the service menu).
3. Disconnect unit from the power source.
4. Disconnect the liquid hose and vapor hose
from the tank.
5. Disconnect the wires from the air purge
solenoid and tank temperature sensor.
6. Remove the two bolts securing the tank to
the scale.
7. Remove the tank from the scale.
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ACS 553, ACS 563 Service Manual
Installing Replacement ISV Assembly
1. Place the tank on the scale.
2. Secure the tank to the scale with two bolts.
3. Reconnect liquid and vapor hoses to tank
and open the tank valves.
4. Reconnect tank temperature sensor and air
purge solenoid wires.
5. Connect the unit to the power source.
6. Perform service vacuum (refer to "Service
Vacuum" in the Diagnostics and Testing
section).
7. Perform tank fill (refer to "Tank Fill" in the
Maintenance section).
NOTE: Every time the ISV is replaced, during
the tank fill, perform a test with external leak
detector.
8. Reinstall the front plastic cover.
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Robert Bosch GmbH