Mazda CT-L1005, Руководство по обучению

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A/C System Basic Climate Control
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To move the compressor oil accumulating in the accumulator / drier further along in the
system it uses a small orifice in the bottom of the pick up tube. As the gaseous
refrigerant moves past this opening, the oil is drawn through the small oil pick up orifice.
At the same time the oil is atomised ensuring that it enters the stream of the refrigerant,
and is carried along to the rest of the system.
NOTE: Refer to the workshop manual when replacing an accumulator / drier. Depending on
the model there may be special procedures required to determine the amount of
compressor oil to be added to the new accumulator / drier, such as draining the
compressor oil from the old accumulator / drier.
Control
A/C Cycling Switch
•
The A/C cycling switch is located on the low-pressure side of the A/C system and
detects the discharge pressure of the evaporator. The PCM processes the signal of the
A/C cycling switch and controls the operation of the A/C compressor accordingly, so that
the evaporator surface temperature is maintained slightly above freezing. This
compensates for the fact that the system has no evaporator temperature sensor.
•
In addition, the A/C cycling switch prevents operation of the A/C compressor when the
pressure in the system is abnormally low.
L1005_059
03-28 Curriculum Training