Section 22: HEATING AND AIR CONDITIONING
PA1553
38
FIGURE 37: SELTEC TM-16HD COMPRESSOR
10.3 MAINTENANCE PRECAUTIONS
10.3.1 Work Area
Because the components of air conditioning
systems are especially sensitive to moisture, dirt
and dust, always observe the following
procedures:
* Work indoors whenever possible.
* Select a level work area.
* Keep work area clean.
* Select a work area with adequate ventilation.
DANGER
Refrigerant itself is not harmful, but excessive
accumulation in a closed area can cause
oxygen deficiency.
* Keep open flame and flammables away from
the vehicle in which the air conditioning
system is being serviced. Open flame is
especially dangerous during Freon leak
testing.
DANGER
Contact with flame and high temperatures can
generate toxic gases.
10.3.2 Refrigerant Handling
Never directly heat refrigerant cylinder or put in
hot water heated above 40°C (104°F) since it
may cause release of the safety plug or the
cylinder may burst. When it is necessary to heat
refrigerant cylinder for charging in cold weather,
use warm water at a temperature below 40°C
(104°F).
DANGER
Do not put the charge valve in warm water.
* Never store refrigerant cylinder in direct
sunlight, near flame, or where the
temperature exceeds 40°C (104°F). Always
store refrigerant cylinder in a cool dry place.
* Never throw or strike refrigerant cylinder and
never handle roughly.
10.3.3 PAG Oil Handling
Whenever a part replacement has to be done on
the system, additional task about PAG oil will
have to be performed.
The compressor has little reserve and is
lubricated by the oil refrigerant mixture. To
perform correctly, the compressor needs the
mixture to be from 3% to 6% of Poly Alkaline
Glycol (PAG) oil.
When a compressor has to be top off due to a
severe lost, the amount of oil to be added should
be evaluated with the refrigerant charge or a
compressor oil change should be performed to
rise up the compressor oil charge to 180 ml or
the written charge on the nameplate.
* The oil should be free from moisture, dust,
metal shavings, etc.
* Do not mix with other oils.
* The moisture content of the oil increases
when exposed to the air for prolonged period.
Therefore, after use, seal the container
immediately.
DO NOT MIX PAG AND POE OR MINERAL
OILS!
10.3.4 Refrigerant Recovery
Some air conditioning system refrigerant
compounds are chlorofluorocarbons, and
therefore may be damaging the earth’s ozone
layer. Consequently, the release of refrigerant
into the atmosphere must be avoided.
Whenever refrigerant is to be released from the
air conditioning system, a refrigerant recovery
unit must be used to recover the refrigerant.
This refrigerant can then be recycled and
reused, which is both environmentally safe and
economical.
Approximately 7.0 lbs (3,2 kg) (W0) or 7.5 lbs
(3,4 kg) (W5 and WE) are used in the system.
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