1
1-11-2-1-17
Ensure not to scratch the inner surface of the valve or the end of the valve shaft.
•
Once adjustments to the valve are completed, ensure to tighten the valve cap according to
•
the prescribed torque.
Precautions for handling the valve cap
Caulking treatment, etc.
Insulation
material
Piping
Use a push-rod with a charge hose.
•
Once adjustments to the valve are completed, ensure to tighten the valve cap according to
•
the prescribed torque.
Precautions for handling the service ports
For proper connection, align the union and
fl
are straight with each other.
Ensure that the pipes do not come into contact with the compressor’s bolts or exterior panel.
There is a risk of condensation from the 3-way valve coming out between the insulation material and the indoor unit’s piping when you install the outdoor unit above then the
indoor unit. Ensure to caulk the connection parts.
Precautions for connecting the pipes
Use materials with good heat-resistant properties as the heat insulator for the pipes. Ensure to insulate both the gas side and liquid side pipes.
If the pipes are not adequately insulated, condensation and water leakages may occur.
Ensure that the current insulation covers the pipes up to the unit’s connecting part.
If the piping is exposed, it may cause condensation or burn (when touch the pipe).
Precautions for insulation installation
Maximum temperature limit of gas or liquid piping is 120 °C
Precautions for flare nut installation
Dimensions when adding
fl
are nuts and the tightening torque
A
s
n
o
is
n
e
m
i
d
n
o
it
c
e
s
e
r
a
l
F
).
x
o
r
p
p
a
(
e
u
q
r
o
t
g
n
i
n
e
t
h
g
i
T
e
zi
s
g
n
i
p
i
P
fi
n
o
c
e
r
a
l
F
guration
ø 6.35
18.0 N•m (180 f•cm
)
8.7 ~ 9.1 mm
90° ± 2°
45° ±1°
ø 9.52
42.0 N•m (420 f•cm
)
12.8 ~ 13.2 mm
ø 12.7
55.0 N•m (550 f•cm
)
16.2 ~ 16.6 mm
ø 15.88
65.0 N•m (650 f•cm
)
19.3 ~ 19.7 mm
After piping connection has completed, ensure there is no gas leakage.
When tightening the
fl
are nut, coat the
fl
ares (inner surface only) with refrigerant oil on the
fl
ares
Firstly, screw in 3-4 turns by hand.
Ensure not to get oil on the screw part.
Refrigerant oil used is ether-based.
Once the piping connections are completed, perform leakage inspection using nitrogen gas.
When
fl
ared joints are reused, the
fl
are part shall be re-fabricated.
Application for ether-based oil
Tightening torque (approx.)
Val
ve cap
(V
al
ve si
ze)
ø6.35 (1/4")
14N•m~18N•m
(140
f•cm~180 f•cm)
ø12.7 (1/2")
49N•m~55N•m
(490
f•cm~550 f•cm)
ø15.88
48.0N•m~59.8N•m
(480
f•cm~598 f•cm)
Service port
10.7N•m~14.7N•m
(107
f•cm~147 f•cm)
[3-way valve operation method]
•
Use an Allen wrench.
Direction to open
Opening : Open the cover and turn the
Allen wrench counter-clockwise
until it stops.
Closing : Open the cover and turn the
Allen wrench clockwise until it
stops.
Ensure to do the re-fl
aring of pipes before connecting to units to avoid leaking.
To prevent the ingress of moisture into the joint which could have the potential to freeze and
then cause leakage, the joint must be sealed with suitable silicone and insulation material.
The joint should be sealed on both liquid and gas side.
Insulation material and silicone sealant. Please ensure
there are no gaps where moisture can enter the joint.
Silicone Sealant must be neutral cure and ammonia free. Use of
silicon containing ammonia can lead to stress corrosion on the
joint and cause leakage.
Observe the followings to decide reusing the existing refrigerant piping.
Poor refrigerant piping could result in product failure.
In the circumstances listed below, do not reuse any refrigerant piping. Instead, make sure to install a new piping.
Heat insulation is not provided for either liquid-side or gas-side piping or both.
The existing refrigerant pipe has been left in an open condition.
The diameter and thickness of the existing refrigerant piping does not meet the requirement. (Refer to above tables)
The piping length and elevation does not meet the requirement. (Refer to above tables)
Use only R32 or R410A genuine branch pipe.
Perform proper pump down for operated product before reuse piping.
In the circumstances listed below, clean it throughly before reuse.
Pump down operation cannot be performed for the existing air conditioner.
The compressor has a failure history.
Oil color is darken. (ASTM 4.0 and above)
The existing air conditioner is gas/oil heat pump type.
Do not reuse the
fl
are to prevent gas leak. Make sure to install a new
fl
are.
If there is a welded part on the existing refrigerant piping, conduct a gas leak check on the welded part.
Replace deteriorated heat insulating material with a new one. Heat insulating material is required for both liquid-side and ga
s-side piping.
INCASE OF REUSING EXISTING REFRIGERANT PIPING
In high humidity environment, reinforce the insulation material for the refrigerant piping. Failure to do so may result in condensation on the surface of the
insulation material.
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