Switch And Sender On The Refrigerant Circuit - Skoda Citigo 2012 Workshop Manual

Citigo 2012 ➤ , Fabia 2000 ➤ , Fabia II 2007 ➤ , Fabia II 2009 ➤ , Fab ...
Air conditioning system with refrigerant R134a - Edition 10.2014
2.4 Switch and sender on the refrigerant cir‐
cuit
⇒ "2.4.1 Outside temperature switch F38 ", page 28
⇒ "2.4.2 Air conditioner pressure switch F129 ", page 28
⇒ "2.4.3 High-pressure sender G65 ", page 28
⇒ "2.4.4 Regulating valve for compressor of air conditioning sys‐
tem N280 ", page 29
2.4.1 Outside temperature switch - F38-
Switches off the magnetic coupling at a temperature of 2°C and
switches it on again at 5°C (evaporator icing protection).
2.4.2 Air conditioner pressure switch - F129-
This pressure switch has 3 functions:
1 - Switches the radiator fan to the next speed in the event of a
pressure rise [approx. 1.6 MPa (16 bar) overpressure] in the
refrigerant circuit.
2 - Disconnects the air conditioning system in the event of ex‐
cessive pressure (approx. 3.2 MPa/32 bar overpressure) -
insufficient engine cooling -.
3 - Disconnects the air conditioning system if the pressure is
too low (0.2 MPa/2 bar overpressure) (e.g. during loss of
refrigerant).
2.4.3 High-pressure sender - G65-
Note
The high pressure sender - G65- (specifically designed for vehi‐
cles) can be installed instead of the pressure switch for the air
conditioning system - F129- .
The high-pressure sender - G65- determines the pressure in the
refrigerant circuit and transmits the values to the Air conditioning
system control unit - J301- or to the Climatronic control unit -
J255- .
The following are shifted via these control units:
♦ The radiator fan - V7- switches to the next speed in the event
of a pressure rise in the refrigerant circuit
♦ Reduction of the A/C compressor output if the pressure is too
high, 3.2 MPa (32 bar), e.g. too little engine cooling
♦ Reduction of the A/C compressor output if the pressure is too
low, 0.2 MPa (2 bar), e.g. refrigerant loss
28
Rep. gr.00 - Technical data