1A-8
1967
PONTIAC
SERVICE
MANUAL
not
have a temperature exceeding
125°F.
on
scales,
place refrigerant drum In pan containing water,
note weight, and
only
open low
pressure
valve on
gauge
set.
(2)
Start engine, move temperature
control
knob
to
full
cold
position, and place blower
control
for
high
speed.
Operate engine for ten minutes at
2000 rpm to stabilize system.
(3)
With
compressor operating,
slowly
open
valve
on refrigerant drum and
allow
refrigerant to
flow
into
system (through
manifold
gauge
set)
until
liquid
indicator clears up and immediately shut off
valve
at
gauge
set or on refrigerant drum. Check
weight
of refrigerant drum and
pail
of water. Then
slowly
open valve on
gauge
set (or refrigerant
drum)
and add one more pound of refrigerant. Note
total
amount of refrigerant added.
b.
Refrigerant-12 Disposable Can Method (15
oz.
per can).
(1)
Make
sure
the outlet valve on the J 6271
Fitz-All
valve is
fully
clockwise and attach the
J
6271 to a "one pound" can of refrigerant as
follows:
back off the valve
from
the top of the
retainer,
slip
the valve onto the can and
turn
the
valve
into
the retainer
until
tight.
DO NOT ac-
cidentally
open outlet valve
during
this operation
as
turning
the valve
into
the retainer punctures the
top
of the can to make it ready for charging.
(2)
Connect center
flexible
line
of
gauge
set
to
the
fitting
on the valve.
(3)
Start engine, move temperature
control
knob
to
full
cold
position and blower
control
for
high
speed
A/C mode. Operate engine for ten
minutes at 2000 rpm to stabilize system.
(4)
With
compressor operating,
slowly
open
valve
on refrigerant can and
allow
refrigerant to
flow
into
system (through
manifold
gauge
set)
until
liquid
indicator clears up and immediately shut off
valve
at
gauge
set and on refrigerant can. Check
weight
of can and valve assembly and record.
(5)
Add an additional one pound of refriger-
ant by adding refrigerant
from
the can just weighed
until
can is empty.
Attach
another can and add
refrigerant
until
can and valve assembly
weigh
the
same
as recorded,
6. Close valves at refrigerant drum or can.
7. Test for leaks and make operational check of
system as
outlined
under
OPERATIONAL
TEST.
CHECKING
COMPRESSOR
OIL
LEVEL
AND
ADDING
OIL
The refrigeration system
with
the six-cylinder
axial
compressor requires 11
fluid
ozs. of 525
viscosity
oil.
After
the system has been operated,
oil
circulates throughout the system
with
the re-
frigerant.
Hence,
while
the system is running, oil
is
leaving the compressor
with
the
high
pressure
gas
and is returning to the compressor
with
the suction
gas.
To
enhance
return of oil to the compressor, under
partially
depleted refrigerant charge conditions on
the custom air
conditioning
system, an oil bleed
line
from
the bottom of the evaporator to the suction
line
at the P.O.A. valve has been provided. The core in
the bleed
line
fitting
at the P.O.A. valve has a special
low
force spring in it
which
allows the core to open
a 5 to 12 psi
pressure
difference. It is important
that this core not be replaced
with
a standard
tire
core.
NOTE:
The oil level in the compressor should not
be checked as a
matter
of course, such as is done
in the car engine crankcase.
In
general, the compressor oil
level
should be
questioned
only
in
cases
where there is evidence of
a major loss of system oil such as:
a. Broken
hose
or
severe
hose
fitting
leak.
b.
Oil sprayed in large amounts under the hood
due to a badly leaking compressor seal(s).
c.
Collision
damage to refrigeration system
components.
REPLACING
REFRIGERATION
SYSTEM
COMPONENTS
OTHER
THAN
COMPRESSOR
When
refrigerant system components other than
the compressor are replaced, the compressor must
also be removed and oil drained
from
the compres-
sor. The amount of oil to put back
into
the com-
pressor is
found
as
follows:
DO NOT add any more
oil
than is
necessary,
or maximum
cooling
will
be
reduced.
1. Remove the compressor and place in a
hori-
zontal
position
with
the compressor drain
plug
down-
ward,
drain compressor in an empty graduated
bottle,
measure
the amount of oil and discard this
oil.
2.
If the quantity of oil measured is more than 4
fluid
ozs., replace
into
the compressor the
same
amount of clean oil as the oil drained, plus the
fol-
lowing
amount for the refrigeration system com-
ponent being changed.
a. Evaporator-
3
fluid
ozs.
b.
Condenser-1
fluid
oz,
c. Receiver-dehydrator assembly-1
fluid
oz.
To Next Page
Loading...
