Air
Conditioning
Sy.stem Manual
-------
Rolls-Royce & Bentley
------------
The
main
advantage
of
this feature is that
although recirculation enables the air conditioning
system to operate more effectively, the
simultaneous introduction
of
fresh
air
provides
adequate
ventilation, permitting the
car
to
be
driven with
the
windows closed.
In
countries where humidity
is
high, the unit
will
extract
a large
proportion
of
moisture from
the air;
if
necessary,
the
heater may
be
used
in conjunction with the refrigeration system to
provide warm,
dry air when the atmosphere is
cool
and
damp
.
Fine
gauze .filters incorporated in the recircula-
tion
and
fresh air intakes (see Fig.
1)
, prevent
the ingress
of
grit
and
other foreign particle
s.
The
refrigeration
sys
tem
operates
on
a cyclic
principle: after being compressed
in
the com-
pressor, the refrigerant passes
to
a condenser and
then
in
liquid
form
to
a valve where
it
expands
and
then evaporates in a matrix before returning
to the compressor.
During evaporation,
the
gas absorbs heat from
the air
passing
over
the
matrix surface.
The
air
thus enters the
car
at
a reduced temperature, also
at
reduced humidity, since a proportion
of
the
water va
pour
in
the air will condense during the
cooling process
and
drain away through drain
holes provided.
The system
is
charged with Freon
12
refrigerant
(Dichlorodifluoromethane) circulated
by
the com-
pressor.
The
compressor is driven
via
a magnetic
clutch by Vee belts from the coolant pump pulley.
The
compressor
delivers refrigerant
to
the
condenser mounted in front
of
the engine radiator
matrix,
where
the
gas is condensed to liquid.
A series
of
pipes incorporating
re
ceiver, drier,
solenoid valves
and
expansion valves connects the
condenser to the evaporator unit
s.
Page2
H
IGH
PRESSURE SER.VICE V
AL
VE
2
LOW
PR
ESS
UR
E SERVICE
VALVE
CO
MPRESSOR
OIL
Fl
ll
ER
PLUG
IMPORTANT:
Ref
er
to co
mpr
essor
deta
ilr
for
instructions regarding the
removal
of
this
plug
.
Fig.
3 Compre&&or
in
po@ition
The
refrigerant
is
atomised in the expansion
valves before entering
the
evaporators, where the
resultant pressure
drop
permits
the
liquid to
vaporise
ar;id
so absorb
heat
from
the
air
passing
through
the matrices.
Air
is ducted to the evaporators by two systems:
From
the air
intake
situated
at
the
front
of
the
right-hand
wing, fresh air is ducted along inside
"'
0
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