ACS 553, ACS 563 Service Manual
1 689 975 295 2021-04-13Robert Bosch GmbH
69
Plumbing and Mechanical
The plumbing and mechanical system
is controlled by electrical impulses from
the electrical system. There are four main
components to the plumbing system:
• Compressor
• Vacuum Pump
• Internal Storage Vessel (ISV)
• Manifold Assembly
Along with these components are several
ancillary components:
•
• Oil Drain Bottle
• High- and Low-Side Gauges
• High- (red) and Low-Side (blue) Service
Hoses
All components are interconnected with various
copper tubing. The copper tubing connects
the compressor discharge port to the manifold
assembly. All lines connected to the compressor
are high-pressure lines.
Every time the circuit under pressure is
opens or one component (hoses, compressor,
gauges) is replaced, perform a pressure leak
When replacing the compressor, heed all
warnings, cautions, and any other related safety
The vacuum pump is used in this unit for the
recovery and vacuum processes. For vacuum
chapter of this manual.
tank. Sensor and solenoid on the ISV include:
• Air Purge (S6)
• ISV Temperature (TT) sensor
• Vapor and liquid valves
The manifold assembly consists of solenoids:
• Low-Side Inlet 1 (S4-1)
• Low-Side Inlet 2 (S4-2)
• High-Side Inlet 1 (S5-1)
• High-Side Inlet 2 (S5-2)
• Tank liquid (S7)
•
• Vacuum (S9)
• Recover (S11)
• Oil Return (S13)
• Oil inject (S14).
Also included are transducers:
• Low Side Pressure (LSP) transducer
• Accumulator Pressure (AP) transducer
The manifold assembly permits efficient,
reliable operation of the unit. The oil separator
attached below the manifold. This manifold
assembly is not interchangeable with any other
manifold assembly.
Repair or replacement of the manifold should
be performed under clean conditions so
particulates do not enter the assembly from
any open ports. Particulates can clog the small
chambers and cause solenoid and check valve
malfunctions, as well as contaminate a vehicle
air conditioning system.
Ancillary components and assemblies included are:
The fan is necessary to keep
operation temperature of 50°C (122°F) or less.
This bottle provides a reservoir
for used oil and must be drained when the user is
instructed to do so by the control panel. Operators
should drain this bottle prior to each use of the
unit to make sure unit operation is not interrupted.
These gauges
monitor the high- and low-side pressures when
the unit is operating.
These hoses connect the unit to the
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