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Air conditioning systems with refrigerant R1234yf - General information - Edition 07.2017
1.2.13
Refrigerant line with internal heat ex‐
changer
♦ In this refrigerant line, the warm liquid refrigerant flowing on
the high pressure side supplies energy to the cold refrigerant
gas or vapour flowing on the low pressure side, thus enhanc‐
ing the efficiency of the air conditioner.
Note
This illustration shows a refrigerant line with inner heat exchanger
as fitted e.g. on the Golf 7, Audi A4 2008 > and Audi A5 Coupé
2008 > ⇒ Heating, air conditioning; Rep. gr. 87 ; Refrigerant
circuit .
A - Refrigerant line with internal heat exchanger
B - Channels in the refrigerant line along which hot liquid refrig‐
erant flows to the evaporator (high pressure side of refrigerant
circuit).
C - Channel in the refrigerant line through which the cold gaseous
or vaporous refrigerant flows to the air conditioner compressor
(low pressure side of refrigerant circuit).
1.2.14
Quick release couplings of refrigerant
lines
Note
♦ This illustration shows the quick-release couplings with a re‐
frigerant line with internal heat exchanger as fitted e.g. on the
Audi A4 2008 > and the Audi A5 Coupé 2008 > ⇒ Heating, air
conditioning; Rep. gr. 87 ; Refrigerant circuit (vehicle-specific
workshop manual).
♦ Removal of the refrigerant line -D- involves opening the re‐
taining ring -A- e.g. with the refrigerant line release tool ( re‐
lease tool - T40149- or removal tool - T40232- ) ⇒ Heating,
air conditioning; Rep. gr. 87 ; Refrigerant circuit (vehicle-spe‐
cific workshop manual).
♦ After removing the respective refrigerant line, the quick re‐
lease couplings -B- and -G- are to be renewed along with the
associated support ring -E- or -H- and the associated seal
-F- or -J- ⇒ Heating, air conditioning; Rep. gr. 87 ; Refrigerant
circuit (vehicle-specific workshop manual) and ⇒ Electronic
parts catalogue .
A - Retaining ring (in quick release coupling on high pressure
side)
B - Quick release coupling with retaining ring “high pressure side”
C - Refrigerant line with internal heat exchanger
D - Refrigerant line “high pressure side”
E - Support ring “high pressure side”
F - Seal “high pressure side”
G - Quick release coupling with retaining ring “low pressure side”
H - Support ring “low pressure side”
J - Seal “low pressure side”
1. Refrigerant circuit
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