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Maintenance
&
RepairSorvall®
CentrifugesIf
the
oil
is
contaminated,
a
running
burnout
is
indicated.
Refer
to
paragraph
6-16
forcleaning
procedure.c.
Triple
Sweep
Evacuation
of
Refrigerant
and
Charge1.
Connect
a
System
Analyzer
to
the
HIGH
and
LOW
service
valves;
then
connect
tovacuum
pump,
and
evacuate
the
system
at
30
inches
vacuum
pressure.CAUTIONDo
not
mix
refrigerant
F12
and
F502.
Chemical
reaction
may
cause
re¬frigerants
to
mix
with
oil
and
produce
contamination
in
the
system.2.
Break
the
vacuum
with
the
refrigerant
to
be
used
for
charging
the
system,
thenvapor
charge
to
3-5
psi
gauge
pressure.
Evacuate
the
system
to
30
in
vacuum.3.
Repeat
step
2
twice
prior
to
a
final
charge
of
32
oz
of
refrigerant.LOW
SERVICEVALVESYSTEMANALYZERVACUUMPUMP7
79RCS
109Figure
6-61.
Cleaning
and
Charging
the
Refrigeration
System6-44
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