The programmer will often contain vacuum solenoids and the temperature blend door control motor. The programmer/amplifier is usually located under the dash, most often directly on the case/duct assembly. In systems that use dumb heads, the ATC controller is often located in the programmer or amplifier. Often, all of the vacuum control solenoids will be packaged together in a “solenoid box,” but sometimes they may be mounted individually in the appropriate locations on the case/duct assembly. In systems that use smart heads, all system operational decisions originate directly within the control head, and in most cases, all of the controlled devices, such as vacuum solenoids and electric motor actuators will be remotely mounted. In cases where the ATC controller is located in the control head, it is often referred to by the industry slang term as being a “smart head.” In situations when the control head serves only as an interface between the occupants and a remotely mounted controller, it is referred to as a “dumb head.” The control head is the “control panel” mounted in the dashboard, that allows selection of the various system functions. Where this is the case, there will be no separate “stand alone” ATC system controller. Sometimes, control of ATC system operation is also a function of the BCM. The list of components and systems that can be controlled by a BCM can be quite lengthy. Some vehicles are equipped with an electronic device called a “Body Control Module” or “BCM.” BCMs can control many different functions, such as power window and seat operation, audio systems, in some applications, even windshield wiper and instrument panel illumination. In these cases, it is strictly a simple electronic device that more or less only controls compressor clutch, cooling fan and engine idle-up functions, somewhat of a “helper” to the PCM or ECM.) In many domestic vehicles, ATC controllers are often referred to as “Programmers.” In many imported vehicles, ATC controllers are often referred to as “Amplifiers” or “A/C Amplifiers.” (Note: Many non-ATC equipped imports also use a module commonly referred to as the amplifier or A/C amplifier. Sometimes, controllers issue electrical commands to other components, such as blower motor power modules.ĪTC controllers go under a variety of different names. The result of a controller command may not always be motion, however. Examples of this could be a heater control valve opening or closing, a vacuum control solenoid passing vacuum through to a vacuum actuator, an electric motor moving a temperature blend door, etc. They gather input data from sensors, make decisions based on the sensor data, then issue appropriate commands to controlled devices, with the end result usually some type of mechanical motion. Really, it has only one job: to do whatever it takes to keep the interior of the vehicle at a stable set temperature as selected by the vehicle occupants.ĪTC controllers are essentially microprocessor devices, mini-computers very similar to the type that control electronic fuel injection systems. It processes the data it receives from its sensors and issues output commands to the various devices it controls.
#Atc vehicle manual
These components essentially work the same way in an ATC system that they do in a manual temperature control (MTC) system.Īs noted, the ATC controller is the “brains” of the system. Of course, an ATC system contains many other components, such as the refrigeration system, the blower motor, ductwork, wiring, etc.
that eventually turn electrical signals into mechanical motion. The Controlled or Output Devices – Vacuum solenoids, electric motors, etc.
The Sensors – Supply the controller with pertinent input data The Controller – The “brains” of the system
ATC systems contain what we’ll refer to as three major component groups.
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