When Handling Refrigerant
| 1. |
R-134a liquid refrigerant is highly volatile.
A drop on the skin of your hand could result in localized frostbite.
When handling the refrigerant, be sure to wear
gloves. |
| 2. |
It is standard practice to wear goggles or
glasses to protect your eyes, and gloves to protect your hands. If
the refrigerant splashes into your eyes, wash them with clean water
immediately. |
| 3. |
The R-134a container is highly pressurized.
Never leave it in a hot place, and check storage temperature is
below 52°C (126°F). |
| 4. |
An electronic leak detector should be used to
check the system for refrigerant leakage. Bear in mind that the
R-134a, upon coming into contact with flame, produces phosgene, a
highly toxic gas. |
| 5. |
Use only recommended lubricant for R-134a
systems. If lubricants other than the recommended one used, system
failure may occur. |
| 6. |
PAG lubricant absorbs moisture from the
atmosphere at a rapid rate, therefore the following precautions must
be observed:
| A. |
When removing refrigerant components
from a vehicle, cap the components immediately to prevent
entry of moisture. |
| B. |
When installing refrigerant components
to a vehicle, do not remove the cap until just before
connecting the components. |
| C. |
Complete the connection of all
refrigerant tubes and hoses without delay to prevent the A/C
system from taking on
moisture. |
| D. |
Use the recommended lubricant from a
sealed container
only. | |
| 7. |
If an accidental discharge in the system
occurs, ventilate the work area before resume of service.
|
When replacing parts ON A/C system
| 1. |
Never open or loosen a connection before
discharging the system. |
| 2. |
Seal the open fittings of components with a
cap or plug immediately to prevent intrusion of moisture or
dust. |
| 3. |
Do not remove the sealing caps from a
Replacement component until it is ready to be
installed. |
| 4. |
Before connecting an open fitting, always
install a new sealing ring. Coat the fitting and seal with
refrigerant oil before making the connection.
|
When Installing Connecting Parts
Flange With Guide Pin
Check the new O-ring for
damage (use only the specified) and lubricate by using compressor oil.
Tighten the nut to specified torque.
Size
|
Tightening torque [ N.m (kg.m,
lbf.ft) ]
|
General bolt,
nut
|
4T
|
7T
|
M6
|
5 -
6
(0.5 - 0.6, 3.6 - 4.3)
|
9 -
11
(0.9 - 1.1, 6.5 -
7.9)
|
M8
|
12 -
15
(1.2 - 1.5, 8.7 - 10.8)
|
20 -
25
(2.0 - 2.5, 14 -
18.0)
|
M10
|
25 -
30
(2.5 - 3.0, 18 - 21.6)
|
45 -
50
(4.5 - 5.0, 32 -
36.1)
|
Size
|
Flange bolt,
nut
|
4T
|
7T
|
M6
|
5 -
7
(0.5 - 0.7, 3.6 - 5.0)
|
8 -
12
(0.8 - 1.2, 5.8 -
8.6)
|
M8
|
10 -
15
(1.0 - 1.5, 7 - 10)
|
19 -
28
(1.9 - 2.8, 14 - 20)
|
M10
|
21 -
31
(2.1 - 3.1, 15 - 22)
|
39 -
60
(3.9 - 6.0, 28 -
43)
|
| •
|
T means tensile intensity, which is
stamped on the head of bolt only
numeral. | |
Handling tubing and fittings
The internal parts of
the refrigeration system will remain in a state of chemical stability as
long as pure moisture-free refrigerant and refrigerant oil are used.
Abnormal amounts of dirt, moisture or air can upset the chemical stability
and cause problems or serious damage.
The Following precautions must be
observed
| 1. |
When it is necessary to open the refrigeration
system, have everything you will need to service the system ready so
the system will not be left open any longer than
necessary. |
| 2. |
Cap or plug all lines and fittings as soon as
they are opened to prevent the entrance of dirt and
moisture. |
| 3. |
All lines and components in parts stock should
be capped or sealed until they are ready to be
used. |
| 4. |
Never attempt to rebind formed lines to fit.
Use the correct line for the installation you are
servicing. |
| 5. |
All tools, including the refrigerant
dispensing manifold, the gauge set manifold and test hoses, should
be kept clean and
dry. |
