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Air conditioning systems with refrigerant R1234yf - General information - Edition 07.2017
1.2.20
Connections with valve for switches in
refrigerant circuit
Note
Refer to vehicle-specific refrigerant circuit for switching pres‐
sures, removing and installing switches and location/design of
switches ⇒ Heating, air conditioning; Rep. gr. 87 ; Refrigerant
circuit (vehicle-specific workshop manual).
•
•
The switches on the high pressure and low pressure sides
have different threads.
Only valves and seals resistant to R1234yf refrigerant and the
related refrigerant oils may be used ⇒ Electronic parts cata‐
logue .
A - Connection (brazed)
B - Seal
C - Valve (with seal)
lk
Note
♦ To remove and install the valve -C- with the refrigerant circuit
empty, use e.g. an adapter from socket set - T10364- (speci‐
fied torque ⇒ page 55 ).
♦ There are different versions of these valves; therefore tight‐
ening torques vary. For a valve insert -C- with a VG5 thread
(5.2 x 0.7 mm, tyre valve) the tightening torque is 0.4 Nm
± 0.1 Nm; for a valve insert with an M6 x 0.75 mm thread the
tightening torque is 0.9 Nm ± 0.1 Nm, and for a valve insert
with an M8 x 1.0 mm thread the tightening torque is
2.0 Nm ± 0.2 Nm.
1.2.21
Pressure senders and switches in refrig‐
erant circuit
Note
♦ Pressure senders and switches come in different versions,
with different functions and different designations ⇒ Heating,
air conditioning; Rep. gr. 87 ; Refrigerant circuit (vehicle-spe‐
cific workshop manual).
♦ Switching pressures, removing and installing switches and
switch layout and type ⇒ Heating, air conditioning; Rep. gr.
87 ; Refrigerant circuit (vehicle-specific workshop manual).
1. Refrigerant circuit
59
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