40
…
box
continued
from
previous
page
Step
3
·
Loosen
the
connection
port
which
connected
with
yellow
pipeline
and
the
pressure
gauge,
and
open
the
refrigerant
tank
slightly
to
let
the
refrigerant
eliminate
the
air.
Caution:
open
the
tank
slowly
to
avoid
freezing
your
hand.
·
Set
the
weighing
scale
to
zero.
Step
4
·
Open
the
three
valves
on
the
pressure
gauge
to
begin
charging
refrigerant.
·
When
the
amount
charged
reaches
R
(kg),
close
the
three
valves.
If
the
amount
charged
has
not
reached
R
(kg)
but
no
additional
refrigerant
can
be
charged,
close
the
three
valves
on
the
pressure
gauge,
run
the
outdoor
units
in
cooling
mode,
and
then
open
the
yellow
and
blue
valves.
Continue
charging
until
the
full
R
(kg)
of
refrigerant
has
been
charged,
then
close
the
yellow
and
blue
valves.
Note:
Before
running
the
system,
be
sure
to
complete
all
the
pre
‐
commissioning
checks
as
listed
in
Installation
Manual,
11.3
“Pre
‐
commissioning
Checks”
and
be
sure
to
open
all
stop
valves
as
running
the
system
with
the
stop
valves
closed
would
damage
the
compressor.
Figure
3
‐
8.1:
Charging
refrigerant
Master
unit
Slave
unit
Slave
unit
R410A
refrigerant
tank
Yellow
hose
Gas
pipe
stop
valve
Liquid
pipe
stop
valve
Field
piping
Stop
valve
service
port
Pressure
gauge
Blue
hose
1
2
Red
hose
1
2
Weighing
scale
Pressure
gauge
