-------------
Rolls-Royce &
Bentley
-------
Air
Conditioning
System
Manual
fire. Under no circumstances must this be replaced
by
a solid
plug
.
THE
DRIER
The
drier
unit
is
mounted
below the right-hand
fr
o
nt
apron
and
in
the liquid line between the
refrigerant
receiver
and
the twin
solenoid
valves
(see
(F
ig. 14).
The
unit
consists
of
a steel
tubular
shell fitted
with flared connections
at
the inlet
and
outlet.
Screwed
into
the
inlet
port
is a metal gauze filter
to
prevent
the ingress
of
coarse impurities
and
to
protect
the
dehydration
charge, which is
granulated silica-gel.
At
the outlet end, a felt
pad,
retained by a perforated metal plate, prevents the
ingress
of
fine impurities.
The
drier
unit
and
the
dehydration
charge
s
hould
be
renewed
alternately
at
intervals
of
10,000
mile
s,
i.e. after
10,000
miles,
renew
the
unit
;
after
20,000 miles, renew
the
charge only.
The
charge
mu
st also be renewed
if
for any
reason
the
system
is
opened
to
remove
a faulty
unit.
1 DfllER
To
remove
the
unit,
release
the
pipe
union
at
each
end
of
the
shell.
To
renew the charge, remove the union situated
at
the
inlet
end,
clean
the
gauze
filter
and
check
to ensure
that
the felt filter is
not
obstructed.
Extract
the
spent
charge
and
replace
by a fresh
quantity
of
silica-gel.
THE EXPANSION VALVES
Two
expansion valves are used, each valve
controlling
the
atomisation
of
the
refrigerant
entering
its respective
evaporator
matrix.
The
valve body is a brass stamping and
basically
comprises
an
inlet
passage
, valve
chamber
and
an
outlet
bore
; the inlet
and
outlet
bores are fitted with flared connections. A
renewable gauze filter is provided
in
the inlet bore
to
prevent
the
ingress
of
coarse
impurities
which
could
obstruct
the
valve orifice.
The
valve is
operated
by the pressure difference
in a hermetically sealed
chamber
containing
a
·2 RECEIVER
3
FUS
I
BLE
PLUG
Fig.
14
Drier
aPd
r
eceive
r
Pog~
/9
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