Specifications

8.
lnstall
a new drier.
9.
Evacuate
and recharge the
system.
10. Leak test
all
tubing
joints
and test run
the refrigerator.
moved
without disturbing the refrigerant
charge.
When
using
gauges
to check
operating
pressures,
observe these
precautions.
1. Make
sure the
gauges
are
accurately
calibrated.
When not
connected into a
system, the
gauge pointers
should in-
dicate
0
pressure.
lf necessary,
turn
the recalibrating
screw on the
dial un-
til the
pointer
is
at 0.
a. HIGH
SIDE
-
near
normal
pressure
LOW
SIDE
-
lower
pressure
(pos-
sible vacuum)
WATTAGE
-
lower
than normal
The
evaporator
tube
or other low side
tubing
is
probably
restricted
(kinked
or
blocked with foreign
particle).
This
condition is
usually accompanied
with
a
frost
build-up
on the low
side of the
restriction,
and high
side
pressures
will
not unload
and balance with the
low
side within
the
prescribed
7 to
10
minutes
after the
compressor is
stopped.
b,
HIGH SIDE
-
lower
pressure
LOW SIDE
-
slightly lower
pressure
WATTAGE
-
lower
than normal
These results
usually
indicate a leak
in the high
side of
the
system. Both
gauges
will
show
progressively
less
pressure
as more refrigerant
escapes.
c. HIGH
SIDE
-
much higher
pressure
LOW
SIDE
-
slightly lower
pressure
WATTAGE
-
higher
than normal
These
gauge
readings
usually
indicate
a
leak
in the low
side
of
the
system.
High
side
pressures
will
continually
increase
since air
drawn in through
the
leak collects
and becomes trapped
in
the high
side tubing. The
low side
gauge
may
show a
slight
pressure
be-
cause
of the
air being drawn in
through
the leak.
Process
Tube
Discharge
Tube
Side-By-Side
Suction
Tube
11. Pinch the
process
tube and cut the
service valve
off the
tubing.
Solder
the
joint
and check
for leaks.
CHECKING PRESSURES
lf the
refrigeration
system is not
operating
properly,
check the operating
pressures.
Install
a
piercing
valve
on the compressor
process
tube.
NOTE: The
only time
you
should
use a
piercing
valve
is to
check
pressures.
lf
the
system is
operating
properly, pinch
off
between the valve
and
the
compressor.
The refrigerant
charge
will not
be dis-
turbed.
For high
side
pressures,
install
another
piercing
valve
about 6 inches
from the
compressor
on the
discharge line.
How-
ever,
you
will have
to
evacuate
and re-
charge the
system,
since the valve
must
not
be left
on the tubing
and cannot
be re-
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