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:
Seam seals, body of CNG-powered vehicles
Note
Seam seals made during repair work must be identical in
appearance and thickness to the original seam seals.
To avoid damage or faulty operation, brush seam seals smooth
near attachments which must be attached.
...
Removing and installing intermediate padding, backrest with through-loading
aperture
Removing
–
Fold down lid for through-loading aperture.
–
Release locking lugs -1- using
a screwdriver and at the same time push down intermediate
padding -2- as far as stop
-arrow A-.
...
Air duct
Assembly overview - air duct and air
distribution in passenger compartment
The assembly overview for air duct and air distribution is
identical with the respective assembly overview for vehicles
with air conditioning system
→ ...
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Pressures and temperatures in the refrigerant circuit
Refrigerant circuit with restrictor and reservoir