Bomag BW 211 D-40 Service Manual page 12

1.2
Air conditioning system
Caution
!
Lines in the air conditioning system must only be
loosened by trained and explicitly instructed ex-
perts.
Wear safety goggles! Put on your safety goggles.
●
This will protect your eyes against coming into con-
tact with refrigerant, which could cause severe
damage by freezing.
Wear safety gloves and an apron! Refrigerant are
●
excellent solvents for greases and oils. In contact
with skin they will remove the protective grease film.
However, degreased skin is very sensitive against
cold temperatures and germs.
Do not allow liquid refrigerants to come into contact
●
with skin! Refrigerant takes the heat required for
evaporation from the environment. Very low tem-
peratures may be reached. The results may be local
frost injuries (boiling point of R134a -26.5°C at am-
bient pressure).
Do not inhale higher concentrations of refrigerant
●
vapours! Escaping refrigerant vapours will mix with
the ambient air and displace the oxygen required for
breathing.
Smoking is strictly prohibited! Refrigerants may be
●
decomposed by a glowing cigarette. The resulting
substances are highly toxic and must not be in-
haled.
Welding and soldering on refrigeration equipment!
●
Before starting welding or soldering work on vehi-
cles, (in the vicinity
of air conditioning components) all refrigerant must
be drawn out and the rests removed by blowing out
the system with nitrogen. The decomposition prod-
ucts created from the refrigerant under the influence
of heat not only are highly toxic, but also have a
strong corrosive effect, so that pipes and system
components may be attacked. The substance is
mainly fluorohydrogen.
Pungent smell! In case of a pungent smell the afore
●
mentioned decomposition products have already
been created. Extreme care must be exercised not
to inhale these substances, as otherwise the respi-
ratory system, the lungs and other organs may be
harmed.
When blowing out components with compressed air
●
and nitrogen the gas mixture escaping from the
components must be extracted via suitable exhaust
facilities (workshop exhaust systems).
Handling pressure vessels
Since the fluid container is pressurized, the manu-
●
facture and testing of these pressure vessels is gov-
erned by the pressure vessel directive. (New edition
12
from April 1989). Paragraph 10 of the pressure ves-
sel directive demands that these pressure contain-
ers must be periodically inspected and tested by a
specialist, according to paragraph 32. In this case
periodically recurring inspections consist of external
examinations, normally on containers in operation.
The refrigerant container must be visually inspected
two times per year, within the frame work of major
inspections. Special attention must thereby be paid
to signs of corrosion and mechanical damage. If the
container is in no good condition, it should be re-
placed for safety reasons, in order to protect the op-
erator or third parties against the dangers when
handling or operating pressure vessels.
Secure pressure vessels against tipping over or roll-
●
ing away.
Do not throw pressure vessels. Pressure vessels
●
may thereby be deformed to such an extent, that
they will crack. The sudden evaporation and escape
of refrigerant releases excessive forces. This ap-
plies also when snapping off valves on bottles. Bot-
tles must therefore only be transported with the
safety caps properly installed.
Refrigerant bottles must never be placed near heat-
●
ing radiators. Higher temperatures will cause higher
pressures, whereby the permissible pressure of the
vessel may be exceeded. The pressure vessel di-
rective therefore specifies that a pressure vessel
should not be warmed up to temperatures above 50
°C.
Do not heat up refrigerant bottles with an open
●
flame. Excessive temperatures can damage the
material and cause the decomposition of refriger-
ant.
Do not overfill refrigerant bottles, since any temper-
●
ature increase will cause enormous pressures.
Environment
In operation, during maintenance and repair work
and when taking refrigeration systems our of
service it is not permitted to let refrigerant escape
into the atmosphere, which would contradict the
current status of technology.
Battery
Wear goggles and face protection (acid).
●
Wear suitable clothes to protect face, hands and
●
body (acid).
Work and store accumulators only well ventilated
●
rooms. (Development of oxyhydrogen gas).
Do not lean over the battery while it is under load,
●
being charged or tested. (Danger of explosion).
Burning cigarettes, flames or sparks can cause ex-
●
plosion of the accumulator
Keep ignition sources away from the battery.
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BOMAG
Safety regulations
008 911 63