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Verfügbare Sprachen
SPECIAL PRECAUTIONS WHEN DEALING WITH R410A UNIT
R410A
is
a
new HFC refrigerant
which does
not damage the
ozone
layer. The
working
pressure
of
tlils
new refrigerant
is
1.6
times
lilgher tllan
conventional
refrigerant
(R22),
thus
proper installation/servicing
is
essential.
Never
use refrigerant other than R410Ain
an
air
conditioner
which
is
designed to
operate witll
R41OA.
POE
or
PYE
oil
is
used
as
lubricant for R41
0Acompressor,
which
is
different
from
the mineral
oil
used
for
R22
compressor.
During installation
or
servicing,
extra
precaution
must
be
taken not to
expose
tile R410A
system
too
long
to
moist
air.
Residual POE
or
PVE oil in tile piping and
components can absorb
moisture from tile
air.
To
prevent
mischarging,
the diameter
of
tile
service port
on tile flare valve is
different
from that
of
R22.
Use
tools and materials
exclusively
for refrigerant R41OA.
Tools exclusively
for R410A are manifold
valve, charging
hose,
pressure
gauge, gas
leak
detector,
flare
tools,
torque
wrench, vacuum
pump
and
refrigerant
cylinder.
As
an
R410A
air conditioner
incurs higher pressure
than R22
units,
it is
essential
to
choose
the
copper
pipes
correctly.
If the refrigerant
gas
leakage
occurs
during
installation/
servicing,
be
sure to
ventilate
fully. If the refrigerant
gas
comes
into
contact with
fire
,
a poisonous gas
may
occur.
When
installing
or
removing an
air conditioner, do
not
allow air or
moisture to remain in the refrigerant
cycle.
VACUUMING AND CHARGING
Vacuuming
is necessary
to
eliminate all
moisture
and
air from the system.
Vacuuming The Piping And The Indoor
Unit
, - - - - - - - - - - - - - - - - - - - - - - ,
Except for the outdoor unit
which
is
pre-charged
with
refrigerant,
the indoor unit and tile refrigerant
connection
pipes
must
be air-purged because
tile
air containing
moisture
that
remains
in tile refrigerant
cycle
may
cause
malftmction
of
the
compressor.
Remove the
caps
from the
valve and
tile service
port.
Connect
the
center of
tile
charging gauge
to tile
vacuum
pump.
Connect
the
charging
gauge to tile
service port of
tile
3-way
valve.
Start tile
vacuum pump.
Evacuate for
approximately
30
nilnutes.
TIle
evacuation
time
varies with
different
vacuum
pump
capacity. Confmn
tllat the
charging gauge
needle
has
moved
towards
-760mmHg.
Caution
If tile
gauge
needle
does
not
move
to
-760mmHg,
be
sure
to
check
for leakage
at
flare
type
connection
of the indoor
and
outdoor
milt and repair the leak
before
proceeding to
tile next
step.
Close
the
valve of
tile
changing gauge and
stop the
vacuum
pump.
On tile
outdoor
milt,
open
tile suction
valve (3 way)
and
liquid
valve
(2
way)
(in
anti-clockwise
direction) with
4mm
key
for hexagon
sacked screw.
Charge Operation
TIils
operation
must
be
done
by
using
a gas cylinder
and
a
precise
weighing
machine. The
additional charge
is
topped-up
into the
outdoor
milt nsing the suction
valve via
tile service
port.
Remove the
service port cap.
Connect
tile low pressure side
of
the
charging gauge
to tile
suction
service
port
center of
the
cylinder
tank
and
close
tile lilgh pressure side of the gauge. Purge tile
air
from tile
service
hose.
Start tile air
conditioner
unit.
Open tile
gas cylinder
and low pressure
charging valve.
When the required refrigerant
quantity is
pumped into
tile
milt,
close
the
low pressure side
and
the
gas
cylinder
valve.
Disconnect the
service
hose
from
service
port. Put back
tile service
port cap.
1-13
LOW PRESSURE GAUGE
VALVE
lUGH
PRESSURE GAUGE
OIECKVALVE
CO!'.'HGURATION
OF
AIR
PURGE BY CHARGIXG
lUGH
PRESSURE GAUGE
HOSE
CHECK VALVE
CO!'.'HGURATIO:-.l OF AIR
PURGE BY CHARGL"G
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