A
PD MANUAL
IOM-39
18 of 36
Aug 99 R1
1 1/2" (40mm)
22.
Measure
and
record
the
suction
and
discharge
pressures.
On
compressors
equipped
with
an
oil
pump,
measure
and
record
net
oil
pressure.
(net
oil
pressure
is
oil
pressure
minus
suction
pressure.).
Check
and
record
the
oil
level
on
compressors
that
are
equipped
with
oil
level
sight
glasses.
23.
Check
system
charge:
When
thermostatic
expansion
valves
(TX
valves)
are
provided,
the
charge
can
be
checked
with
the
liquid
line
sight
glass.
Under
normal
operating
conditions
the
sight
glass
is
clear
of
bubbles.
Refer
to
Charging
Instructions.
NOTE:
It
is
possible
for
conditions
other
than
low
refrigerant
charge
to
cause
the
sight
glass
to
bubble.
Bubbling
may
occur
when
condenser
fans
cycles
on,
superheat
setting
is
too
low
or
filter
‐
drier
is
plugged
etc.
The
TX
valve
superheat
was
checked
and
adjusted
at
the
factory
to
maintain
a
superheat
of
18°F
(10°C)
plus
or
minus
3°F
(2°C)
measured
on
the
suction
line
10
inches
(250mm)
from
the
compressor.
This
setting
rarely
requires
readjustment.
Should
adjustment
be
necessary,
refer
to
the
TX
valve
manufacturers
recommendations
.
24.
Condenser
fan
blades:
Fan
blades
must
be
correctly
positioned
within
the
orifice
for
proper
air
flow.
25.
Set
all
controls
to
the
settings
indicated
on
the
wiring
diagram.
26.
Re
‐
install
all
access
panels.
27.
Remove
any
packing
material
or
debris
and
dispose
appropriately.
