Pressures And Temperatures In The Refrigerant Circuit; Refrigerant Circuit With Expansion Valve - Volkswagen Amarok 2011 Workshop Manual

Amarok 2011 ➤ , Beetle 2012 ➤ , Bora 1999 ➤ , CC 2010 ➤ , CC 2012 ➤ , ...
Air conditioning system with refrigerant R134a - Edition 10.2014
2.5.5 Evaporator output temperature sender -
G263- or evaporator temperature sen‐
sor - G308-
Function:
The evaporator output temperature sender - G263- or evaporator
temperature sensor - G308- reads the temperature downstream
from the evaporator. This value is transmitted to the air condi‐
tioning system control unit and serves as a reference signal for
regulating the air conditioner compressor. This prevents icing of
the evaporator.
2.6 Pressures and temperatures in the re‐
frigerant circuit
WARNING
When working on the refrigerant circuit, observe generally ap‐
plicable safety rules and the Regulations for Pressure Tanks.
The pressures and temperatures in the refrigerant circuit depend
on the momentary operating conditions (e.g. engine speed, speed
1, 2, or 3 of radiator fan, engine temperature, whether air condi‐
tioner compressor is on or off) as well as environmental influences
(e.g. ambient temperature, humidity, required cooling output).
In vehicles with air conditioner compressor regulating valve -
N280- , the pressure on the low-pressure side is varied by acti‐
vating the valve.
Therefore, the values given in the following tables may only be
considered as guidelines. They occur at an engine speed of 1,500
to 2,000 rpm and an ambient temperature of 20°C after about 20
minutes.
The locations of connections provided for pressure measure‐
ments can be found in the vehicle-specific coolant circuits.
⇒ Rep. gr. 87
At 20°C and with the engine stopped, the refrigerant circuit will
adjust itself to a pressure of 4.7 bar positive pressure
2.7

Refrigerant circuit with expansion valve

A- low-pressure side of the refrigerant circuit.
B- high-pressure side of the refrigerant circuit.
32
Rep. gr.00 - Technical data
⇒ page 3 .