Safety Precautions - Case 580SR Service Manual

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By giving off heat to the outside air, the vapour is
condensed to a liquid which moves under high pres-
sure to the receiver dryer where it is stored until re-
leased to the evaporator by the temperature
sensing expansion valve.
As liquid refrigerant passes through the metered or-
ifice in the expansion valve the refrigerant changes
from a high pressure liquid to a low pressure atom-
ized liquid with a lower temperature.
This low pressure, low temperature, atomized liquid
enters the evaporator coils and absorbs heat from
3.2

SAFETY PRECAUTIONS

S WARNING
Before overhauling an air conditioning system read
and observe the following safety precautions. If a re-
pair or replacement becomes necessary, ensure
that only certified air conditioning technicians are
employed, using approved equipment to effect re-
pairs.
Do not attempt to disassemble the air conditioning
system. It is possible to be severely frostbitten or in-
jured by escaping refrigerant.
IMPORTANT: do not allow refrigerant to escape
into the atmosphere.
Refrigerant must be handled with care in order to
AVOID HAZARDS.
Undue direct contact with liquid refrigerant can pro-
duce freezing of skin and eyes.
Keep the refrigerant container and air conditioning
system away from flame or heat sources; the result-
ing pressure increase can cause the container or
system to explode.
If in direct contact with open flames or heated metal
surfaces, the refrigerant will decompose and pro-
duce products that are toxic and acidic.
SECTION 50 - CAB HEATING AND AIR CONDITIONING
the cab warm air blown across the coils and fins by
the cab blower motor. The refrigerant now changes
from a cold low pressure atomized liquid to a warm
low pressure vapour and leaves the evaporator out-
let, moving to the suction (low pressure) side of the
compressor to repeat the cycle.
As this heat loss is taking place, moisture (humidity)
in the cab air will condense on the outside of the
evaporator and drain off as water through the drain
hoses attached to the evaporator drain pan, thereby
reducing the humidity level of the cab.
Make sure to comply with the following indications
and simple precautions to avoid any risk of injury:
Z Never discharge refrigerant into the atmosphere.
When servicing air conditioning units a certified re-
frigerant recovery unit operated by a certified tech-
nician must be used.
Z When discharging the refrigerant in the system
make sure you are operating in well-ventilated
premises with good air circulation and far away
from open flames.
Z When charging and discharging the system always
wear goggles and take suitable precautions to pro-
tect the face in general and the eyes in particular,
from accidental spillage of the refrigerant fluid.
Z The oil and refrigerant mixture inside the air condi-
tioning system is pressurized. Consequently, nev-
er loosen fittings or tamper with lines unless the
system has been properly discharged.
Z Before loosening any connection, cover the fitting
in question with a cloth and wear gloves and gog-
gles in order to prevent refrigerant from reaching
the skin or eyes.
Z In the event of an accident, proceed as follows:
If the refrigerant has reached the eyes, wash them
immediately with copious amounts of sterilized wa-
ter or mains pressure tap water and transfer to
hospital for immediate medical help.
If the refrigerant has touched the skin, wash with
cold water and transfer to hospital for immediate
medical help.
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