Sensors And Transducers; Control Board Software Updating Methods - Bosch ACS 553 Service Manual

Electrical

Sensors and Transducers

The sensors and transducers provide the
input and feedback data needed to control the
operation of unit.
Sensors include:
1. Air Flow Sensor (AF): the sensor is
integrated in the fan (disabled on R134a).
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the amount of refrigerant withdrawn from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
refrigerant added to the system, and how
much refrigerant is available in the ISV for
use.
3. ISV Tank Temperature (TT): supplies the
temperature of the refrigerant stored in
the ISV for adjusting fluid weight based on
density.
4. Refrigerant Identifier (ID): identifies
R1234yf refrigerant and tests refrigerant
for purity (external through the USB port).
Transducers include:
1. Low-side Pressure (LSP): measures the
pressure in the low side of the vehicle A/C
system.
2. Accumulator Pressure (AP): measures
the pressure in the oil separator to ensure
proper oil separation from the refrigerant.
NOTE: The tank pressure is read by low-side
pressure transducer.
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ACS 553, ACS 563 Service Manual

Control Board Software Updating Methods

To access the operational capability of the
unit, or to provide an interface to an external
computer (or network), or to update the
software as required occasionally to keep the
unit current. See "Firmware update" in the
Setup Menu section.
Refer to Figure 3-4 (Sheets 1 through 4), for a
graphical representation of the interconnection
of the electrical components.
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Robert Bosch GmbH