PIPER
CHEROKEE
SIX
SERVICE
MANUAL
Locating and repairing
the trouble early will usually result
in savings to the customer both in
time and additional troubles that too often result from neglect.
A Performance
Test of the system is the only positive
way in which the complete system
can be checked for efficient operation. The air conditioning system should be given this test
before work is begun on the system whenever possible, however, if the system is completely
inoperative, repairs must be performed before the system can be properly tested. The test
can
uncover further work that must be performed
before the system is brought
to its full
operating efficiency.
The Performance Test should always
be performed after repair work
has been done and before the aircraft is released to the customer. The serviceman
performing
this test carefully
will insure that the
repairs have been
properly performed
and
that
the system will
operate satisfactorily.
The
Performance Test when properly performed
includes a thorough examination
of the
outside
of the system
as well as the inside.
Many related parts
are overlooked
because it is
felt
they are of no
bearing on the operating
efficiency
of the unit. For this
reason, a
thorough
visual inspection of the complete
system should be performed, followed
by an
operating inspection of the system.
13-5. SPECIAL SERVICING PROCEDURES. The air conditioning system should be
serviced by a qualified shop with
trained personnel. The following
procedures and
precautions
should
be observed.
The efficiency
of this
system depends
upon
the pressure-temperature
relationship
of
pure refrigerant. As long as the
system contains only pure refrigerant
plus a specified
amount
of compressor
oil (which is mixed
with the refrigerant),
it is considered
to be
chemically
stable. Foreign
materials within
the system will affect
the chemical
stability.
contaminate
the system, and
decrease its efficiency.
I. GENERAL
REFRIGERATION
SYSTEM
PROCEDURES.
A. REFRIGERANT
SAFETY
PRECAUTIONS.
1. Refrigerant
12 (commonly
known as R-12
or "Freon" 12)
is odorless and
colorless in either
the liquid or
gaseous state.
R-12 for charging
refrigeration
systems is
supplied
in pressurized
containers
(approx.
70 psi
at 70 F)
in
liquid form. Since
this material is essentially inert
at room temperatures the
dangers are primarily
associated with the pressure
and the refrigeration
effects
of the release
and subsequent
evaporation
of this pressurized
liquid.
2.
Wear suitable
eye protection when
handling R-12
due to the possibility
of
freezing
of the eye
if contacted by
escaping liquid
refrigerant. If
liquid R-12
does strike the
eye. the following actions
should be taken:
a. DO NOT RUB THE EYE.
b. Splash large
quantities
of cool water
into the eye
to raise the
temperature.
c.
Tape on an eye
patch to avoid
the possibility
of dirt entering
the eye.
d. Rush to a
physician or hospital for immediate
professional aid.
e. DO NOT
ATTEMPT TO TREAT
IT YOURSELF.
3. If liquid
R-12 strikes
the skin frostbite
can occur. Treat
with cool water
and
protect with
petroleum
jelly.
4. Do not discharge
large quantities of R-12 into
closed rooms. It may displace
most of the air
in the room and
this could cause
oxygen starvation.
Gaseous
R-l 2 is heavier than air
and flows to the bottom of
a container.
ACCESSORIES
AND
UTILITIES
Issued: 8/17/72
3G14
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