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6. INSTALL THE CONNECTING PIPE
6.1
The Procedure of Connecting Pipes
Al l fiel d pipin g mus t b e provide d b y a license d
refr ig erat io n tec hni c i a n a n d m u s t c o m pl y wi t h t h e
relevant local and national codes.
Do not let ai r , dust, or other impurities fall in the pipe
system during the time of installation.
The connecting pipe should not be installed until the
indoor and outdoor units have been fixed alread y .
Keep the connecting pipe dr y , and do not let moisture in
during installation.
Execute heat insulation work completely on both sides
of the gas piping and the liquid piping. Otherwise, this
can sometimes result in water leakage.
Follow the condensing unit piping recommendations.
1
Be sure to with insulating materials cover all the exposed
parts of the flare pipe joints and refrigerant pipe on the
liquid-side and the gas-side. Ensure that there is no gap
between them.
Incomplete insulation may cause water condensation.
How to Connect the pipes
Flaring
1
Cut a pipe with a pipe cutte r . (Refer to Fig.6-1)
90
Insert a flare nut into a pipe and flare the pipe.
Refer to T able 4-2 for the dimension of flare nut spaces.
T able 6-1
Pipe gauge
T ightening
15 ～ 16 N.m
Ø 6.4
(153 ～ 163 kgf.cm)
25 ～ 26N.m
Ø 9.5
(255 ～ 265 kgf.cm)
35 ～ 36 N.m
Ø 12.7
(357 ～ 367 kgf.cm)
45 ～ 47 N.m
Ø 15.9
(459 ～ 480 kgf.cm)
65 ～ 67N.m
Ø 19.1
(663 ～ 684 kgf.cm)
installation manual
6
CAUTION
CAUTION
Lean
crude
burr
Fig.6-1
Flare dimensin A
Flare
torque
min
(mm)
max
8.3
8.7
12.0
12.4
15.4
15.8
18.6
19.0
22.9
23.3
2
Connect the indoor unit first, then the outdoor
unit.
Bend the tubing in proper wa y . Do not harm to them.
The bending angle should not exceed 90.
Bendin g positio n i s preferabl y i n th e middl e o f th e
bendable pipe. The larger the bending radius the better it
is.
Do not bend the pipe more than three times.
When connecting the flare nut, coat the flare both inside
and outside with either oil or ester oil and initially tighten
by hand 3 or 4 turns before tighting firml y .
B e sur e t o us e bot h a spanne r an d torqu e wrenc h
together when connecting or discon n ecting pipes to /from
the unit.
T oo large torque will harm the bellm o uthing and too small
wil l caus e leakage . Pleas e de t ermin e th e torqu e
according to T able 6-2.
After the connecting work is finish e d, be sure to check
that there is no gas leak.
VACUUMING SYSTEM
Stop valve operation introduction
1.
Opening stop valve
1.
2.
3.
shape
2.
Closing stop valve
1.
90 ° ± 4
A
2.
R0.4~0.8
Bend the pipe with thumb
min-radius 100mm
CAUTION
Remove the cap and turn the valve
counterclock-wise with the hexagon wrench.
T urn it until the shaft stops.Do not apply excessive force
to the stop valve. Doing so may breakthe valve bod y , as
the valve is not a backseat type. Always use the special
tool.
Make sure to tighten the cap securel y .
Remove the cap and turn the valve clockwise with the
hexagon wrench.
Securely tighten the valve until the shaft contacts the
main bodyseal.
Fig.6-2
Fig.6-3
Fig.6-4
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