Piper PA-32RT-300T User Manual

LANCE II SERVICE
MANUAL
SECTION
XIV
ACCESSORIES
AND
UTILITIES
14-1.
AIR CONDITIONING
INSTALLATION.
14-2.
DESCRIPTION.
Components
used
for
this
installation
consist
of
a two
cylinder,
piston
type
compressor
supported
by
special
bracketry
located
on
the
front
of
the
engine.
The
compressor
is
driven
by
a V-belt
connected
to
the
engine
ring
gear
which
drives
the
compressor
through
a magnetic
clutch.
An
evaporator
mounted
in a
fabricated
housing
along
with
the
receiver-dehydrator,
circulating
fan,
thermal
expansion
valve
and
related
plumbing
is
mounted
in
the
rear
of
the
cabin
aft
of
the
baggage
area.
The
condenser
is
installed
in
the
bottom
portion
of
the fuselage
tail
section
and is
hinge
mounted
to
allow
its
extension
into
the
airstream
during
system
operation.
The
condenser
is electrically
operated
to
provide
two
positions
automatically,
as required
(system
on
- fully
extended
and
system
off
- fully
retracted).
The
system
is protected
by
a Ranco
type
pressure
switch
which
automatically
controls
the
condenser
maximum
head
pressures
by
temporarily
de-clutching
the
compressor
in
the
event
the
pressure
becomes
excessively
high.
The
controls
are
located
in
the
aircraft
instrument
panel
adjacent
to
the
heater
and
defroster
levers,
and
consist
of an
air
conditioning
ON-OFF
control,
a
three
position
fan
control
(LOW
- OFF
- HIGH)
to
govern
the
cold
air
velocity
and a
temperature
control.
The
system
design
is such
that
there
is
no
increase
in
drag
to
the
aircraft,
during
its
take-off
flight
conditions.
During
maximum
power
demands
the
compressor
is
de-clutched
and
the
condenser
door
is
automatically
retracted.
14-3.
AIR
CONDITIONING
SYSTEM
OPERATION.
The
air
conditioning
system
is
a recirculating,
independent
unit.
It
filters,
dehumidifies
and
cools
the
air
as it
cycles
through
the
evaporator.
The
unit
is
operated
from
controls
mounted
on
the
right
side
of
the
instrument
panel.
The
air
conditioning
master
switch
has
two
positions:
"OFF
and
ON
AIR
COND."
When
the
"AIR
COND"
position
is selected
the
compressor
clutch
engages,
and
the
condenser
scoop
opens.
The
temperature
is
controlled
by
a thermostat
operated
by
the
temperature
control
selector.
A
three
position
fan
switch
(LOW
-
OFF
- HIGH)
operates
the
blower.
The
fan
may
be
operated
to
circulate
air without
using
the
air conditioning
unit.
The
air
conditioning
system
uses
Refrigerant
12 as
the
refrigerant.
The
refrigerant
enters
the
compressor
as
a vapor.
The
compressor
pressurizes
the
heat-laden
vapor
until
its
pressure
and
heat
reach
a
point
that
is
much
hotter
than
the
outside
air
and
pumps
the
vapor
to
the
condenser
where
it cools
and
changes
to
a
liquid.
The
liquid
then
passes
to
the
receiver-dehydrator.
Its
function
is to
filter,
remove
any
moisture
and
insure
a steady
flow
of
liquid
refrigerant
into
the
evaporator
through
the
expansion
valve.
The
expansion
valve
is
a
temperature
controlled
metering
valve
which
regulates
the
flow
of
the
liquid
refrigerant
to
the
evaporator.
The
evaporator
absorbs
the
heat
from
the
air
passing
over
the
coils.
From
the
evaporator
the
refrigerant
vapor
returns
to
the
compressor
where
the
cycle
is
repeated.
Issued:
1/3/78
ACCESSORIES
AND
UTILITIES
2J18

Piper PA-32RT-300T Specifications

General

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