Bosch ACS 553 Service Manual page 95

ACS 553, ACS 563 Service Manual
POWER CORD— Supplies main power to the
unit.
PRESSURE RELIEF VALVE — Spring-loaded
safety valve to release pressure from internal
storage vessel if pressure exceeds 25 bar
(362 psi).
POWER BOARD— Controls power to all
electrical components.
SCALE ASSEMBLY— Measures the amount
of refrigerant in the ISV being charged into or
recovered from the vehicle A/C system.
SIGHTGLASS— Used to view vacuum pump
oil level.
SOLENOID (S4), LOW-SIDE INLET— Allows
an open pathway for refrigerant flow and vacuum
between the A/C system low side and the unit.
SOLENOID (S5), HIGH-SIDE INLET— Allows
an open pathway for refrigerant flow and vacuum
between the A/C system high side and the unit.
SOLENOID (S6), AIR PURGE— Energized
to allow excessive air to escape from the ISV.
SOLENOID (S7), TANK LIQUID—When
energized, allows refrigerant from ISV to enter
of system being serviced.
SOLENOID (S8), OIL DRAIN— Energized
at the end of the Recover process to drain oil.
S O L E N O I D (S9), VA C U U M — When
energized, allows a vacuum or deep recovery
to be pulled on the A/C system being serviced.
Robert Bosch GmbH
Parts and Components
SOLENOID (S11), RECOVER— When
energized, provides the primary pathway of
removing refrigerant from the system being
serviced. This solenoid is also powered during
the Flush process.
SOLENOID (S13), OIL RETURN— When
energized, it returns compressor oil from the
compressor oil separator to the compressor
and equalizes the pressure on the high and low
side of the compressor.
SOLENOID (S14), OIL INJECT (PAG/POE)
— Energized during the PAG/POE Oil Inject
process to allow A/C system oil to be replenished.
SWITCH ON/OFF — Allows the unit to be turned
ON and OFF.
TANK TEMPERATURE SENSOR— Monitors
the temperature inside the ISV.
TRANSDUCER, ACCUMULATOR (SYSTEM
OIL SEPARATOR) — Measures the pressure
within the system oil separator.
TRANSDUCER, LOW-SIDE— Measures the
pressure of incoming refrigerant from the A/C
system. Pressure readings are then relayed to
the control board.
VACUUM PUMP— Pump designed to removed
moisture and air from an A/C system. Also aids
in the recovery process by performing a deep
recovery of A/C system.
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1 689 975 295 2021-04-13