Description Of The Air Conditioning System; Operation Of The Air Conditioning System; Structure Of The Refrigerant Circuit - Skoda Citigo 2012 Workshop Manual

Fabia II 2007 ➤ , Fabia II 2009 ➤ , Fabia II 2011 ➤
Heating, Air conditioning - Edition 06.2013
2 Description of the air conditioning
system
Note
Detailed description of the function of the air conditioning system
can be found in the Workshop Manual "Air conditioning system
with refrigerant R134a" ⇒ Air conditioning system with refrigerant
R134a; Rep. gr. 00 technical data.
⇒ "2.1 Operation of the air conditioning system", page 26
⇒ "2.2 Structure of the refrigerant circuit", page 26
⇒ "2.3 Parts of the refrigerant circuit", page 28
⇒ "2.4 Extractor, filler and measurement valves for quick cou‐
plings of the AC service station on the refrigerant circuit",
page 30
⇒ "2.5 Parts of the protection and control of the refrigerant circuit",
page 32
2.1

Operation of the air conditioning system

The temperature in the passenger compartment is influenced by
radiant heat through the window and by the contact heat emitted
by metallic parts. In order to provide agreeable temperatures for
the passengers on very hot days, some of the ambient heat must
be evacuated.
As it is a well known fact that heat spreads towards colder tem‐
peratures, an aggregate that generates lower temperatures has
been fitted to the vehicle, i.e. the evaporator. Liquid refrigerant is
continuously evaporated in this aggregate. The heat required for
this operation is drawn from the air flowing through the evapora‐
tor.
The refrigerant gas together with the absorbed heat is pumped
out of the evaporator by the AC compressor. The AC compres‐
sor's compression work increases the heat content and the tem‐
perature of the refrigerant.
The high-temperature refrigerant and its heat content flow to the
condenser. There, because of the temperature difference be‐
tween the refrigerant and the ambient air, the refrigerant releases
heat into the ambient air via the condenser. The evaporated re‐
frigerant is therefore liquified.
The refrigerant is also a heat conveyor. As it will be re-used, it is
again pumped to the evaporator.
2.2

Structure of the refrigerant circuit

Note
All air conditioning components marked * as well as all refrigerant hoses and refrigerant lines must be repaired
or replaced in service centres, as the refrigerant must first be drained off at an A/C service station.
HP = High-pressure side
LP = Low-pressure side
26
Rep. gr.87 - Air conditioning system