Piper PA-32RT-300T User Manual

LANCE
II SERVICE
MANUAL
NOTE
A
table at the end of these
instructions will assist in locating
and correcting malfunctions
which may arise in
this system.
NOTE
The air conditioning system
should be operated
at least once
a month
to prevent
sticking
valves and
keep the system
lubricated.
14-4.
MALFUNCTION
DETECTION.
The detection of
system malfunction
largely
depends on
the mechanic's
ability to interpret
the gauge pressure
readings into system
problems.
A system
operating
normally
will have a
low side gauge
pressure reading
that will
correspond with
the temperature
of the refrigerant
evaporating in the
evaporator, allowing
for a few
degrees temperature
rise
due to loss
in the tube walls
and fins.
The high side
will
have
a gauge pressure
that
will correspond
with
the temperature
of the
refrigerant
condensing in the
condenser, allowing
for a few degrees
temperature drop
due to loss in the
tube walls and fins.
Any deviation
from
that which
is normal indicates
a malfunction
within
the system
due
to a faulty control
device, obstruction,
defective
part, or improper
installation.
Detection
of system
malfunction
is
made easier
with the
knowledge
that the
temperature and
pressure of Refrigerant
12 is in close
proximity between
the pressures of
twenty and
eighty pounds
per square
inch (psi).
A glance at the
temperature-pressure
chart
will show that there
is only a slight
variation between
the temperature and
pressure of the
refrigerant in the lower range.
It is correct
to assume
that for every
pound
of pressure
added to
the low side,
a
temperature
increase
of about one
degree Fahrenheit
takes
place. For instance,
a pressure
of
23.8 on the
chart indicates
a temperature
of 24°F.
A change
of pressure
of almost
one
pound to 24.6
psi gives us a temperature
increase to 25 0 F.
NOTE
For
each
1,000
feet of
elevation
above
sea level,
the
gauge
readings
will be
about
one
inch
of mercury
or
1/2
psi higher
than the chart indicates.
It must be
pointed out
that the actual
temperature
of the
air passing over
the coils
of
the evaporator
will
be several degrees
warmer
allowing for
a temperature
rise caused
by the
loss in the fins and
tubing of the evaporator.
The importance
of
a seasonal check
up of the
air conditioning
system
should be
brought
to the
attention
of the
customer
whenever
possible.
A thorough
check
of the
system
performed
in a methodical
manner
will
reveal trouble
the
customer
is often
not aware
of.
Issued: 1/3/78
ACCESSORIES
AND
UTILITIES
2J20

Piper PA-32RT-300T Specifications

General

Brand	Piper
Model	PA-32RT-300T
Category	Aircrafts
Language	English