Audi A4 2001 - Page 13

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Corrective action
– Vessels must never be completely filled with liquid refrigerant.
Without sufficient room for expansion (gas cushion), vessels
will rupture with devastating effect in the event of an increase
in temperature. Refer to
⇒ “1.1.2 Refrigerant R134a Characteristics“, page 2 .
Refrigerant is never to be transferred to systems or vessels in
which air is present.
Corrective action
– Evacuate systems and vessels before charging with refriger‐
ant.
♦ As per VBG 20, German industrial liability insurance associa‐
tion.
♦ Pay attention to the workshop-specific instructions. Refer to
Audi ServiceNet, HSO Environment Protection.It should be
kept in the workshop.
1.1.8 Safety Precautions for Working with Ex‐
traction and Charging System
• Make sure the shut-off valves are closed before connecting
the charging system to the air conditioning system.
• Before disconnecting the charging system from the air condi‐
tioning system, make sure the charging process has been
completed to stop refrigerant escaping into the atmosphere.
• Once the purified refrigerant from the charging system has
been transferred to an external compressed-gas cylinder,
close the hand shut-off valves at the cylinder and charging
system.
• Do not expose charging system to moisture or use it in a wet
environment.
• Disconnect from power supply before performing service work
on the charging system.
• Never use an extension cable on account of the fire hazard. If
the use of an extension cable is unavoidable, the minimum
cross-section should be 2.5 mm
2
.
• In case of fire, remove external cylinder.
• Entrained oil from the air conditioning system drawn by the
suction unit into the measurement vessel supplied is subse‐
quently to be transferred to a sealed container as it contains
a small quantity of refrigerant. It must not be released into the
environment.
• Following shutdown, service station is to be secured to stop it
rolling away.
1.1.9 Handling Pressure Vessels
Secure vessels to prevent them falling over!
Secure upright cylinders to stop them falling over and cylinders
lying flat to stop them rolling away.
Do not throw vessels!
If dropped, the vessels could be so severely deformed that they
rupture. The refrigerant evaporates immediately, liberating con‐
siderable force. Flying fragments of cylinders can cause severe
injuries.
Audi 100 1991 ➤ , Audi 80 1992 ➤ , Audi A1 2011 ➤ , Audi A2 2001 ➤ , A ...
Refrigerant R134a Servicing - Edition 01.2011
1. General Information 9