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Air conditioner with refrigerant R134a - Edition 11.2018
Sealing empty vessels
Empty refrigerant vessels must always be sealed to prevent mois‐
ture from entering. Moisture can cause steel vessels to rust. This
weakens the vessel walls. In addition, any rust particles which
enter refrigeration systems from storage vessels will cause mal‐
functioning.
2.14
Safety regulations for working with ex‐
traction and charging systems
•
•
Before connecting the charging system to the air conditioning
system, ensure that the shut-off valves are closed.
Before disconnecting the charging system from the air condi‐
tioning system, make sure the charging process has been
completed to prevent refrigerant escaping into the atmos‐
phere.
•
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 the charging system to moisture or use it in a
wet environment.
Disconnect from power supply before performing service work
on the charging system.
An extension cable should not normally be used because it
can increase the fire hazard. If the use of an extension cable
is unavoidable, the minimum cross-section should be 2.5
2
mm .
•
•
In case of fire, remove external cylinder.
If any oil from the air conditioning system is drawn off by the
suction unit into the measuring container provided, it must be
subsequently transferred to a sealable container, as it con‐
tains a small quantity of refrigerant, which must not escape
into the environment.
•
Following shutdown, the air conditioner service station must
be secured to stop it rolling away.
2.15
Safety measures for working on vehi‐
cles with air conditioning system and for
handling refrigerant R134a
Vehicles with high-voltage system (hybrid vehicles)
High voltage! Danger to life!
The voltage levels in the high-voltage system constitute a safety
hazard. Danger of severe or fatal injuries from electric shock if
high-voltage components or high-voltage wiring are damaged.
– Carry out visual check of high-voltage components and high-
voltage wiring.
– Never use cutting/forming tools or other sharp-edged imple‐
ments.
– Never perform work using welding, brazing, thermal bonding
or hot air.
18
Rep. gr.87 - Air conditioning system
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