Volkswagen Polo Service & Repair Manual: Refrigerant Circuit with Expansion Valve
| A-Low pressure side of refrigerant circuit. |
| B-High pressure side of refrigerant circuit. |
|
Component |
Aggregate State of Refrigerant |
Pressure bar (psi) Positive Pressure |
Temperature
in Degrees Celsius (Fahrenheit) |
| -1-
Evaporator, from input to output |
Vapor |
Approximately 1.2 (17.4)
→ Note |
Approximately -7 (20)
→ Note |
| |
|
(Approximately 1.8
(26.1))
→ Note |
Approximately -1 (30)
→ Note |
| -2-
A/C compressor A-side |
Gas |
Approximately 1.2 (17.4)
→ Note |
Approximately -1 (30) |
| |
|
(Approximately 1.8
(26.1))
→ Note |
Approximately -1 (30)
→ Note |
| -3-
A/C compressor B-side |
Gas |
Approximately 14 (203.1) |
Approximately 65 (149) |
| -4-
Condenser |
Gas, vapor, fluid |
Approximately 14 (203.1) |
Approximately 55 (131) at
outlet |
| -5-
Receiver |
Fluid |
Approximately 14 (203.1) |
Approximately 55 (131) |
| -6-
Extraction and filling valve, B-side |
Fluid |
Approximately 14 (203.1) |
Approximately 55 (131) |
| -7-
Expansion valve |
Fluid, released as vapor |
Approximately 14 (203.1) |
Approximately 55 (131),
reduced to -7 (20) |
| -8-
Extraction and filling valve, A-side |
Gas |
Approximately 1.2 (17.4)
→ Note |
Approximately -7 (20)
→ Note |
| |
|
(Approximately 1.8 (26.1))
→ Note |
Approximately -1 (30)
→ Note |
| 1) |
Pressure in refrigerant circuits is maintained at
approximately 2 bar (29 psi), regulated by A/C compressor, even though
heat transfer changes and engine speeds vary. However, this applies only
within the performance range of the A/C compressor; if the performance
limits of the A/C compressor are exceeded, the pressure increases. Refer
to
→ Chapter „Pressures, Checking“. |
| 2) |
Within the control range of the A/C compressor,
temperature in the refrigerant circuits is maintained, regulated by A/C
compressor, even though heat transfer changes and engine speeds vary.
However, this applies only within the performance range of the A/C
compressor; if the performance limits of the A/C compressor are
exceeded, the temperature increases. Refer to
→ Chapter „Pressures, Checking“. |
| 3) |
Measured values for A/C systems with two evaporators |
 Note
| A/C compressors which do not regulate their performance are
switched off by the respective control module via the A/C
Compressor Regulator Valve -N280- at an evaporator temperature
below 0 °C (32 °F). |
| In vehicles with A/C Compressor Regulator Valve -N280-, the
pressure is modified on the low pressure side by the valve. |
|
|
|
WARNING
When performing work on refrigerant circuit, observe
all generally applicable safety precautions and pressure
...
Arrows point in direction of refrigerant flow.
A-Low pressure side of refrigerant circuit.
B-High pressure side of refrigerant circuit.
...
Other materials:
Two-Part HS Premium Filler
Definition:
Two-Part HS Premium Filler -LVM 013 171 A4-, dark gray
Two-Part HS Premium Filler -LGF 013 007 A4-, light gray
Two-Part HS Premium Filler -LGF 013 100 A4-, white
...
Checking
–
Turn off the ignition.
–
Connect pressure gauge battery (A/C service station).
–
Take pressure gauge readings. There are two possible results
A and B.
&nbs ...
Wax Underbody Protection -D 316 D38 A2-
Definition:
Wax Underbody Protection -D 316 D38 A2-
Edition 04/2009
Product Description
Wax Underbody Protection -D 316 D38 A2- is an
solvent-containing anti-corrosion agent ...
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Refrigerant Circuit Pressures and Temperatures
Refrigerant Circuit with Restrictor and Reservoir