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ACS 561 Service Manual
Sensors and Transducers
The sensors and transducers provide the input
and feedback data needed to control the opera-
tion of unit.
Sensors include:
1. Airflow Sensor (AF); senses whether the
unit cooling fan is operating.
2. Scale Assembly; weighs the refrigerant in
the ISV as a baseline for determining the
amount of refrigerant withdrawn from the
vehicle A/C system, the amount of refriger-
ant added to the system, and how much
refrigerant is available in the ISV for use.
Transducers include:
1. Low-side Pressure (LST); measures the
pressure in the low side of the vehicle A/C
system.
2. Accumulator Pressure (AT); measures
the pressure in the oil separator to ensure
proper oil separation from the refrigerant.
Robert Bosch GmbH
Electrical
Memory Expansion
Two types of memory expansion are available:
1. SDIO: An SD expansion card port for up
or downloading vehicle information and for
updating the unit software.
2. USB Host: Standard USB port to connect
external refrigerant identifier (plug and play).
The external identifier is detected only
when a recovery is launched (not in
stand-by mode).
49
SP00D00517
2018-07-11
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