Air
Conditioning
System
Manual
-------
Rolls-Royce
&
Bentley
-------------
switch off. Forward-seat the high pressure service
valve immediately.
Do
not
operate the compressor
with the high pressure valve closed.
Carefully slacken the gauge attachment capnut
on
each
service valve
to
release
the
gas pressure
from the head, then re-tighten. Thoroughly clean
and
dry the area around the oil filler plug and
slowly remove the plug so as to gradually release
the gas pressure from the crankcase.
When
releasing gas pressures, protective goggles
must
be worn to pre.,,ent any possibility
of
refrigerant
coming into contact with the eyes.
Measure
the oil
depth,
using a
dry
, clean rod
approximately
tin.
diameter.
It
may be found
necessary to rotate the compressor slowly by hand
to allow
the
'dipstick'
to
pass
the
crank
balance
weights.
Adjust the oil level by means
of
a syringe,
adding
or
drawing-off oil as necessary. Refit the
filler plug loosely; do not tighten the plug as
it
is
necessary to purge the air from the compressor.
Note:
It
is
recommended
that
oil be used only
from a sealed container.
To
purge
the
air
from
the
com
·
pressor
Slacken the protective cap
on
the high pressure
service valve.
Open
the low pressure service
valve very slightly and allow gas
to
pass through
the compressor for
about
ten seconds. Whilst the
gas
is
still passing,
tighten
the oil filler
plug
and
then the valve
capnut
.
Back-seat
both
service valves
and
refit the
protective caps.
THE CONDENSER
The
condenser
matrix: is situated
between
the
radiator matrix
and
the intake grille (see Fig.
13)
.
Its
purpose
is
to cool refrigerant gas delivered by
the compressor
and
condense it; the liquid
refrigerant
then
passes
into
the receiver.
The
matrix
comprises two banks,
each
of
sixteen horizontal tubes. A single inlet pipe con-
veys compressed refrigerant
to
a
'Tee'
junction
at
the
head
of
the matrix. This
junction
supplies the
Page
18
F'ig.
13
Condenser
01.a1rix
two
banks
independently. At the base
of
the
matrix another junction connects them to the single
outlet.
A by-pass pipe to the flow control valve permits
high
pressure
vapour
to
flow
back
to
the
side
of
the compressor when the valve
is
open
.
THE RECEIVER
The receiver
is
a steel container
of
welded
construction
, secured by three bolts to a bracket
forward
of
the frame front cross-
member
(see
Fig. 14).
The
inlet pipe union
is
situated
at
the top
of
the
container;
the
outlet
union
is
positioned
midway down the right-hand end-face. Inside the
receiver, a pipe attached to the outlet union bends
downward to
the
base
of
the unit in order to
ensure
that
liquid refrigerant only will pass to the
drier
.
A fusible
plug
, inserted
at
the base
of
the unit
(see Fig. 14),
prevents
explosion
in
the
event
of
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