3.3 Installation of the throttle (
f
or some models)
Precautions
-
To
ensur
e
throttle efficiency, mount the throttle
as
horizontally as possible.
-
Wrap the supplied anti-shock rubber
on the outside
of the
throttle
to limit
noise.
1 Anti-shock rubber
2 Throttle
Indoor
Indoor
Indoor
Outdoor
Outdoor
Outdoor
√
×
×
3.4 Purging air and checking gas leakage
When piping work is completed, purge the
air and check for
gas leakage.
WARNING
Do not mix any substance other than the specified refrigerant
into the refrigeration cycle.
When refrigerant gas leaks, ventilate the room as soon as
possible.
The specified refrigerant should always be recovered and
should
never be released directly into the environment.
Use a vacuum pump for the specified refrigerant. Using the
same vacuum pump for different refrigerants may damage
t
he vacuum pump or the unit.
If using additional refrigerant, perform air purging from the
refrigerant pipes and
the
indoor unit using a vacuum pump, th
e
n
charge
the
additional refrigerant.
Use a hexagonal wrench
(4
mm/0.2
in) to operate the stop
valve rod.
All refrigerant pipe joints should be tightened with a torque
wrench at the specified tightening torque.
1) Connect
the
projection side of
the
charging hose (which comes from
the
gauge manifold) to
the
gas stop valve's service port.
2)
3)
4)
Full
y
open
the
gauge manifold's low-pressure valve (Lo) and
completely close its high-pressure valve (Hi)
.
(The h
igh-pressure valve requires no operation.)
Perform
vacuum pumping and make sure that the compound
pressure gauge reads -0.1
MPa (-76
cmHg).*1
Close
the
gauge manifold's low-pressure valve (Lo) and s
t
op
the
vacuum pump.
(
Maintain
this state for a few minutes to make sure the
compound pressure gauge pointer does not swing back.)*2
5)
Remove
the
caps from
the l
iquid and gas stop valve
s
.
6)
Turn the liquid stop valve's rod 90 degrees counterclockwise
w
ith a hexagonal wrench to open
the
valve.
Close it after 5
seconds and check for gas leakage.
Using soapy water,
check for gas leakage from
the
indoor unit's
flare and
the
outdoor unit's flare and valve rods.
After the check is
complete, wipe
off
all soapy water.
7)
Disconnect
the
charging hose from
the
gas stop valve's
service port
,
then fully open
the
liquid and gas stop
valves. (Do not attempt to turn
the
valve rod b
e
yond its
stop.)
8)
Tighten
the
valve and
service port caps for the liquid and
gas
stop valves with a torque wrench at the specified torques.
*1. Pipe length vs. Vacuum pump run time
10
1 Throttle
2 Liquid pipe
3 Gas pipe
≥
500m
m/19.
7in
1
2
3
