Bosch ACS 753 Repair Instructions page 107

ACS 753, ACS 763, ACS 863 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 (S1), AIR PURGE— Energized
to allow excessive air to escape from the ISV.
SOLENOID (S2), OIL INJECT 1 (PAG) —
Energized during the PAG Oil Inject process to
allow A/C system oil to be replenished.
SOLENOID (S3), OIL DRAIN— Energized at
the end of the Recover process to drain oil.
SOLENOID (S4), LOW-SIDE INLET— Allows
an open pathway for refrigerant flow and vacuum
between the A/C system low side and the unit.
This solenoid is powered during the Recover,
Vacuum and Flush process.
SOLENOID (S5), HIGH-SIDE INLET— Allows
an open pathway for refrigerant flow and vacuum
between the A/C system high side and the unit.
This solenoid is powered during the Recover,
Vacuum, and Leak Check process.
SOLENOID (S6), HIGH-SIDE CHARGE—
When energized, allows refrigerant from ISV
to enter high side of system being serviced.
SOLENOID (S7), LOW-SIDE CHARGE— When
energized, allows refrigerant from ISV to enter
low side of system being serviced.
SOLENOID (S8), RECYCLE— When energized,
increases tank pressure to assist the charging
function.
SOLENOID (S9), VACUUM — 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 (S12), DEEP RECOVER— When
energized, uses vacuum pump to perform deep
recovery of refrigerant from the system being
serviced.
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 2 (POE) —
Energized during the POE Oil Inject process to
allow A/C system oil to be replenished.
SOLENOID (S15), UV DYE— Energized during
the UV dye Inject process to allow the UV dye
to enter in the A/C system.
SOLENOID (S17), IDENTIFIER—Energized
during the refrigerant identifier process, allows
to analyse the A/C system refrigerant.
SOLENOID (S18), N2H2 INLET—When
energized, allows to inlet the N2H2 or N2 in
the A/C system.
SOLENOID (S20), N2H2 VENTING—When
energized, allows to venting the N2H2 or N2
from the A/C system.
SOLENOID (S22), TANK LIQUID—When
energized, allows refrigerant from ISV to enter
of system being serviced.
SWITCH ON/OFF — Allows the unit to be turned
ON and OFF.
S Y S T E M O I L
EXCHANGER— Heat exchanger with high-side
coils that provide internal heat to the canister
causing saturated vapor and accumulated liquid
refrigerants to evaporate. This process prevents
liquid refrigerant from entering the compressor
and separates the refrigerant oil.
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S E PA R AT O R / H E AT
SP00D00609 2018-03-26