Cl+
Air
Conditioning
System
Manual
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------
Rolls-Royce & Bentley
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Fig.
13
Filler
Plug-York
Compressor
New compres!'.ors
are
supplied dehydrated
and
containing
the correct
quantity
of
oil. When a new
compressor
is
in!>taHed,
it
is possible
that
some oil
will remain
in
the system, therefore the oil level
must
be checked
and
if
necessary adjusted.
The
oil level must also be checked when
any
refrigerant is extracted from the system.
The
correct oil depth
in
the Tecumseh compressor,
when checked by a dipstick,
is
between
Ii
in. and
It
in.
The
correct oil
depth
in the
York
A.209
is
1-±
in.
Oil
Level-to
Check
Run
the engine at fast idle with the refrigeration
system operating, until the
compressor
is
fully warmed
(approximately
10
minutes)
to
ensure
that
no liquid
refrigerant remains
in
the compressor crankcase.
Forward-seat
the low pressure service valve, run the
engine for a further minute
and
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
cap
nut
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 rdeasing gas pressures, protecrive goggles
must
be
11·orn
to
pre\'ent any possibility
of
refrigerant
coming into contat:t
11·ith
the eyes.
Section C4
Measure the oil
depth
usrng a dry, clean rod
approximately
i in. 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 Compressor
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 cap nut.
Back-seat both service valves and refit the protective
caps.
Fig. 14 Condenser Matrix
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