LG HMC030KD1 Service Manual - Page 44

refrigerant.

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1) Re-air purging (Re-installation) Indoor unit C Liquid side Closed 3-Way valve ti Outdoor unit Gas side Closed 3-Way valve oe Gas cylinder _u_ o L R22 OPEN.4D-7h.) \ CLOSE • Procedure (1) Confirm that both the liquid side valve and the gas side valve are set to the closed position. (2) Connect the charge set and a gas cylinder to the service port of the Gas side valve. - Leave the valve on the gas cylinder closed. (3) Air purging. Open the valves on the gas cylinder and the charge set. Purge the air by loosening the flare nut on the liquid side valve approximately 45° for 3 seconds then closing it for 1 minute; repeat 3 times. - After purging the air, use a torque wrench to tighten the flare nut on liquid side valve. (4) Check for gas leakage. - Check the flare connections for gas leakage. (5) Discharge the refrigerant. - Close the valve on the gas cylinder and discharge the refrigerant until the gauge indicates 3 to 5 kg/cm2g. (6) Disconnect the charge set and the gas cylinder, and set the Liquid side and Gas side valves to the open position. - Be sure to use a hexagonal wrench to operate the valve stems. (7) Mount the valve stem nuts and the service port nut. - Use torque wrench to tighten the service port nut to a torque of 1.8 kg.m. - Be sure to check for gas leakage. * CAUTION: Do not leak the gas in the air during Air Purging. - 44 -

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1)
Re
-air
purging
(Re
-installation)
Indoor
unit
C
Gas
cylinder
_u_
R22
Liquid
side
3
-Way
Closed
valve
Gas
side
oe
OPEN
.4D7h.)
—
3
-Way
valve
o
\
CLOSE
Closed
Outdoor
unit
L
ti
•
Procedure
(1)
Confirm
that
both
the
liquid
side
valve
and
the
gas
side
valve
are
set
to
the
closed
position.
(2)
Connect
the
charge
set
and
a
gas
cylinder
to
the
service
port
of
the
Gas
side
valve.
—
Leave
the
valve
on
the
gas
cylinder
closed.
(3)
Air
purging.
Open
the
valves
on
the
gas
cylinder
and
the
charge
set.
Purge
the
air
by
loosening
the
flare
nut
on
the
liquid
side
valve
approximately
45°
for
3
seconds
then
closing
it
for
1
minute;
repeat
3
times.
—
After
purging
the
air,
use
a
torque
wrench
to
tighten
the
flare
nut
on
liquid
side
valve.
(4)
Check
for
gas
leakage.
—
Check
the
flare
connections
for
gas
leakage.
(5)
Discharge
the
refrigerant.
—
Close
the
valve
on
the
gas
cylinder
and
dis-
charge
the
refrigerant
until
the
gauge
indicates
3
to
5
kg/cm
2
g.
-
44
-
(6)
Disconnect
the
charge
set
and
the
gas
cylin-
der,
and
set
the
Liquid
side
and
Gas
side
valves
to
the
open
position.
—
Be
sure
to
use
a
hexagonal
wrench
to
operate
the
valve
stems.
(7)
Mount
the
valve
stem
nuts
and
the
service
port
nut.
—
Use
torque
wrench
to
tighten
the
service
port
nut
to
a
torque
of
1.8
kg.m.
—
Be
sure
to
check
for
gas
leakage.
*
CAUTION:
Do
not
leak
the
gas
in
the
air
during
Air
Purging.