Volkswagen Golf Service & Repair Manual: Refrigerant circuit with expansion valve
| A- low-pressure side of the refrigerant circuit. |
| B- high-pressure side of the refrigerant circuit. |
|
Component |
Overall
state of the refrigerant |
Pressure (in bar) |
Temperature
in degrees Celsius |
| -1-
evaporator, from inlet to outlet |
Vapour |
approx. 1.2 bar
→ Remark |
approx. -7°C
→ Remark |
| |
|
(approx. 1.8 bar)
→ Remark |
approx. -1°C
→ Remark |
| -2-
Air conditioning system compressor A-side |
Gas |
approx. 1.2 bar
→ Remark |
approx. -1°C |
| |
|
(approx. 1.8 bar)
→ Remark |
(approx. +1°C)
→ Remark |
| -3-
Air conditioning system compressor B-side |
Gas |
approx. 14 bar |
approx. +65°C |
| -4-
Condenser |
Gas, vapour, liquid |
approx. 14 bar |
at outlet approx. + 55°C |
| -5-
Receiver |
Liquid |
approx. 14 bar |
approx. +55°C |
| -6-
Extraction and charging valve, B side |
Liquid |
approx. 14 bar |
approx. +55°C |
| -7-Expansion
valve |
Liquid, released into
vapour |
approx. 14 bar |
approx. +55°C, reduced to -7°C |
| -8-
Extraction and charging valve, A side |
Gas |
approx. 1.2 bar
→ Remark |
approx. -7°C
→ Remark |
| |
|
(approx. 1.8 bar)
→ Remark |
approx. -1°C
→ Remark |
| 1) |
The pressure in refrigerant circuits with regulating air
conditioner compressor is held to approx. 2 bar despite changing heat
transport and differing engine speeds. This applies however only within
the rated range of the air conditioner compressor; if the rated range of
the air conditioner compressor is exceeded, the pressure will increase
→ Chapter. |
| 2) |
The temperature in refrigerant circuits with regulating
air conditioner compressor is held within the regulation range of the
air conditioner compressor despite changing heat transport and differing
engine speeds. This applies however only within the rated range of the
air conditioner compressor; if the rated range of the air conditioner
compressor is exceeded, the temperature will increase.
→ Chapter |
| 3) |
Measured values for air conditioning systems with two
evaporators |
 Note
| Air conditioning system compressors that do not
self-regulate their load are switched off by the respective
control unit via the air conditioner compressor regulating valve
-N280- when an evaporator temperature less than 0°C is sensed. |
| In vehicles with air conditioner compressor regulating valve
-N280-, the pressure on the low-pressure side is varied by
activating the valve. |
|
|
|
WARNING
When working on the refrigerant circuit, observe
generally applicable safety rules and the Regulations
for ...
Arrows show the direction of refrigerant flow.
A- low-pressure side of the refrigerant circuit.
B- high-pressure side of the refrigerant circuit.
...
Other materials:
Instructions for work on underbody and stone chip protection
Note
The structure of the underbody and stone chip protection is
to be reconstructed to conform to the original condition in
appearance and thickness.
Water drainage holes must remain clear.
...
EU tyre label, objectives
Reducing fuel consumption
Increasing road safety
Reducing traffic noise
The EU tyre label provides the end-user with important
information on the properties of the tyre. It does not
ill ...
Removing and installing coolant pipes at heat exchanger (Valeo)
Note
There are different designs and makes of heater and air
conditioning unit. The individual components of the various
heaters and air conditioning units are similar but not identical
(distinguishing features
→ Chapter). The c ...
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Pressures and temperatures in the refrigerant circuit
Refrigerant circuit with restrictor and reservoir