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3.2 - Air conditioner pressure switch -F129
Functions
◆ -> The low/high pressure switch (switch between contacts 1 and 2) deactivates the compressor in the event
of a vacuum or overpressure in the refrigerant circuit (via the operating and display unit -E87).
- Switching pressures (overpressure in bar):
- Switch open (compressor off):
Low pressure switch (opens at 1.2 bar and closes at 2.4 bar).
High pressure switch (opens at 32 bar and closes at 24 bar).
- Switch closed (compressor on):
between 1.2 (2.4) bar and 32 (24) bar.
◆ The high pressure switch (between contacts 3 and 4) switches radiator fan -V7 to speed 2.
- Switching pressures (overpressure in bar):
- Fan (speed 2) on (switch closes) at 16 bar.
- Fan (speed 2) off (switch opens) at 12.5 bar.
Removing and installing
- -> Detach connector.
- Remove pressure switch -B-.
Tightening torque: 5 Nm
- Replace O-ring seal -A- (10.8 mm; 1.8 mm) =>Page 137 .
Audi A3 1997 ➤
Heating, Air Conditioner - Edition 06.2000
3.2 - Air conditioner pressure switch -F129 135
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