Volkswagen Amarok 2011 Workshop Manual page 155

Amarok 2011 ➤ , Beetle 2012 ➤ , Bora 1999 ➤ , CC 2010 ➤ , CC 2012 ➤ , ...
Low-pressure side:
Falling from starting pressure (when pressure gauge is connec‐
ted) to diagram value.
A - Low pressure (measured at the service connection) in bar ab‐
solute pressure.
B - Control current for the air conditioner compressor regulating
valve - N280- .
C - Permitted tolerance range.
Note
Under unfavourable conditions (very high ambient tempera‐
♦
tures, high atmospheric humidity), the pressure on the high-
pressure side can increase to a maximum of 29 bar.
The control current -B- is indicated in the measured values
♦
block.
The high-pressure value measured by the high-pressure
♦
sender - G65- is indicated in the measured values block ⇒
Rep. gr. 87 .
The low pressure is adjusted to within tolerances within the
♦
output range for the air conditioner compressor depending on
the control current for the air conditioner compressor regulat‐
ing valve - N280- .
Under unfavourable conditions (very high ambient tempera‐
♦
tures, high atmospheric humidity), the output may be insuffi‐
cient to achieve the specification in every case.
The set working current for the regulating valve must be great‐
♦
er than 0.3 A to ensure that the regulating valve is reliably
activated.
At the setting "maximum cooling power", the control current
♦
should be approx. 0.65 A to 0.8 A (vehicle-specific, indicated
in the measured values block) ⇒ Rep. gr. 87 .
Absolute pressure means that 0 bar corresponds to an abso‐
♦
lute vacuum. The normal ambient pressure corresponds to 1
bar absolute pressure. On most pressure gauges, a reading
of 0 bar corresponds to an absolute pressure of one bar (which
is confirmed by the existence of - 1 bar marking beneath the
0 scale marking).
Air conditioning system with refrigerant R134a - Edition 10.2014
10. Checking pressures on vehicles
149