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1.4
A/C System, Operating After Filling Re‐
frigerant Circuit
Note
♦
Only start engine after refrigerant circuit has been assembled.
♦
If possible start engine only with a filled refrigerant circuit.
♦
Do not start the engine while evacuating the refrigerant circuit
or when the circuit is already evacuated (the A/C compressor
could be damaged). Refer to ⇒ Refrigerant R134a Servicing;
Rep. Gr. 00 ; Description and Operation (A/C Service Station).
♦
The A/C compressor is always driven by the pulley or by the
driveshaft (there is no magnetic clutch). To prevent damage
when the compressor is idling, it is lubricated by an “internal
oil circuit“.
♦
The compressor has an “internal oil circuit“ to ensure the A/C
compressor is not damaged when refrigerant circuit is empty.
Prerequisite for the internal lubrication is residual refrigerant
oil in A/C compressor.
♦
The engine may only be started when the refrigerant circuit is
installed correctly. For example; if the refrigerant lines are not
connected to A/C compressor, when the engine is running the
A/C compressor may heat up (via internal heat generation) so
much that the A/C compressor will be damaged.
♦
A/C Compressor Regulator Valve -N280- is not activated
when the refrigerant circuit is empty and the A/C compressor
idles with the engine. If there is no refrigerant, then the refrig‐
erant oil, which is needed to lubricate the A/C compressor, will
be not be transported (the A/C compressor will be lubricated
by an “internal oil circuit“).
If it is necessary to start the engine with a discharged refrigerant
circuit
♦ Refrigerant circuit must be fully assembled.
♦ There must be no vacuum in the refrigerant circuit.
♦ At least 1/4 of the prescribed refrigerant oil must be in the A/
C compressor.
♦ Do not rev engine higher than 2500 rpm.
♦ The engine should only run as long as is absolutely necessary.
Note the following when starting engine for first time after filling
refrigerant circuit
♦ All removed parts are installed once again.
♦ The refrigerant circuit is filled with refrigerant. Refer to ⇒ Re‐
frigerant R134a Servicing; Rep. Gr. 00 ; Specifications .
♦ Follow the information on servicing the A/C system after in‐
stalling the compressor. Refer to⇒ Refrigerant R134a Serv‐
icing; Rep. Gr. 00 ; Description and Operation (A/C Service
Station).
– Start engine with the A/C compressor switched off (“Econ“ op‐
erating mode set, indicator light in
AC
button does not light up),
and wait until engine idle speed has stabilized.
– Open all instrument panel vents.
– Set the temperature preset on the Climatronic control module
-J255- to “cold“.
Audi TT 2007 ➤
Heating, Ventilation and Air Conditioning - Edition 01.2011
28
Rep. Gr.87 - Air Conditioning