Table of Contents
Advertisement
HEATER AND AIR CONDITIONING 1A-28
providing a protective film to reduce the possibility
of infection.
3. As soon as possible, call or consult an eye specialist
for immediate and future treatment.
REMEMBER -
pound of cure."
"An ounce of prevention is worth a
PRECAUTIONS IN HANDLING REFRIGERANT LINES
•
All metal tubing lines should be free of kinks, be-
cause of the restriction that kinks will offer to the
flow of refrigerant. The refrigeration capacity of the
entire system can be greatly reduced by a single
kink.
•
The flexible hose lines should never be bent to a
radius of less than 10 times the diameter of the hose.
•
The flexible hose lines should never be allowed to
come within a distance of 2-1/2" of the exhaust
manifold.
•
Flexible hose lines should be inspected at least once
a year for leaks or brittleness. If found brittle or
leaking they should be replaced with new lines.
•
Use only sealed lines from parts stock.
•
When disconnecting any fitting in the refrigeration
system, the system must first be discharged of all
refrigerant. However, proceed very cautiously re-
gardless of gauge readings. Open very slowly, keep-
ing face and hands away so that no injury can occur
if there happens to be liquid refrigerant in the line.
If pressure is noticed when fitting is loosened, allow
it to bleed off very slowly.
CAUTION: Always wear safety goggles when
opening refrigerant lines.
•
In the event any line is opened to atmosphere, it
should be immediately capped to prevent entrance
of moisture and dirt.
•
The use of the proper wrenches when making con-
nections on "O" ring fittings is important. The use
of improper wrenches may damage the connection.
The opposing fitting should always be backed up with
a wrench to prevent distortion of connecting lines or
components. When connecting the flexible hose con-
nections it is important that the swagged fitting and
the flare nut, as well as the coupling to which it is
attached, be held at the same time using three dif-
ferent wrenches to prevent turning the fitting and
damaging the ground seat.
•
"O" rings and seats must be in perfect condition.
The slightest burr or piece of dirt may cause a leak.
•
Sealing beads on hose clamp connections must be
free of nicks and scratches to assure a perfect seal.
MAINTAINING CHEMICAL STABILITY IN THE
REFRIGERATION SYSTEM
The metal internal parts of the Chevrolet refrigeration
system and the refrigerant and oil contained in the sys-
tem are designed to remain in a state of chemical
stability as long as pure R-12 and uncontaminated re-
frigeration oil is used in the system.
However, when abnormal amounts of foreign materials,
such as dirt, air or moisture are allowed to enter the
system, the chemical stability may be upset. When ac-
celerated by heat, these contaminates may form acids
Fig. 40-^-System Contaminants
and sludge and eventually cause the breakdown of com-
ponents within, the system. In addition, contaminates may
affect the temperature-pressure relationship of R-12,
resulting in improper operating temperature and pres-
sures and decreased efficiency of the system.
The following general practices should be observed to
insure chemical stability in the system.
•
Whenever it becomes necessary to disconnect a
refrigerant or gauge line, it should be immediately
capped. Capping the tubing will also prevent dirt and
foreign matter from entering.
•
Tools should be kept clean and dry. This also in-
cludes the gauge set and replacement parts.
•
When adding oil, the container should be exception-
ally clean and dry due to the fact that the refrigera-
tion oil in the container is as moisture-free as it is
possible to make it. Therefore, it will quickly absorb
any moisture with which it comes in contact. For
. this same reason the oil container should not be
opened until ready for use and then it should be
capped immediately after use.
•
When it is necessary to open a system, have every-
thing you will need ready and handy so that as little
Fig. 41—Gauge Set
CHEVROLET CHASSIS SERVICE MANUAL
Advertisement
Table of Contents
