LG GR-B197GVQ Service Manual page 97

TROUBLE DIAGNOSIS
-97-
Items Precautions
4.Vacuum
degassing.
Pipe
Connection
Connect
a
red hose
to
the
high
pressure side and
a
blue hose
to
the
low pressure side.
Vacuum
Sequence
Open
valves and and
evacuate
for 40 minutes. Close valve .
5.Refrigerant charging.
Charging
sequence
1)
Check the
amount
of
refrigerant supplied to
each model after
completing
vacuum
degassing.
2)
Evacuate
charging
cannister with
a vacuum pump.
3) Measure the amount of refrigerant charged.
-
Measure the
weight
of
an
evacuated
charging
cannister with
an
electronic scale.
-
Charge refrigerant
into
a
charging
cannister and
measure
the
weight.
Calculate the
weight
of
refrigerant charged
into the
charging
cannister
by subtracting
the
weight
of
an
evacuated charging cannister.
KEYPOINTING
-
If power is
applied
during
vacuum
degassing,
vacuum
degassing shall be
more
effective.
-
Operate
compressor
while charging
refrigerant. (It
is
easier and
more
certain
to
do like
this.)
KEYPOINTING
-
Be
sure
to charge
the
refrigerant at
around 25°C.
-
Be
sure
to keep -5g
in the winter and
+5g
in
summer
the
amount
of
refrigerant charged=
a
weight
after
charging
-
a
weight
before
charging (weight
of
an
evacuated
cylinder)
Calculation of
amount
of
refrigerant charged
2
1
3
Compressor
Low
pressure
Condenser
High
pressure
Drier
Evaporator
Red
Yellow
Blue
Vaccum
Pump
Suction
pipe
R134a
Indicate the
weight
of
an
evacuated
charging
cannister