Du Pont SORVALL RC-5 Service Manual page 183

Sorvall®
Centrifuges
Maintenance
&
Repaird.
Checking
Refrigerant
Charge1.
Prepare
the
centrifuge by running
the
SS-34
rotor
at
20
000
rpm
for about 30
min¬utes
with the RUN
cycle temperature control
(blue set
pointer)
at
-3°C.
The
ambientroom
temperature
should be about
25°C.2.
Connect a System Analyzer
to the HIGH and LOW service
ports
and check
thecharge
at the
HIGH
and
LOW
pressure ports.
Gauge pressure should be in
the
fol¬lowing
ranges
for the RC-5
and
RC-5B:HIGH
Pressure Side:
195
to
240
psiLOW
Pressure
Side: 8 to 12
psiCompressorCurrent
Draw:
10
-
13Ae.
Leak
Detection1.
With the
system in operation, use an
electronic leak detector in accordance
withmanufacturer's
instructions.2.
If
necessary,
normal shop
techniques
using a
concentration of water and
soap
areeffective.f.
Evaporator Liner
Cleaning1.
After
removing the condensing assembly
(paragraph
6-13). remove
the filter
drierfrom
the HIGH
pressure
side
fitting.2.
Using liquid refrigerants
11
or 113, flush the
evaporator
liner through the
HIGHpressure
side fitting into
the
capillary tubing through
the
evaporator
and
out
theLOW
pressure
side suction tubing. Refrigerant 502
may
be
used as a
refrigerantpressure.3.
Use
a
white cloth
or
soft
paper
to monitor the
flushing.
When the
system
is
clean,flush
the
system
with
dry
refrigerant
502.6-45/6-46