Dimensions Of Flared Pipe; Flared Connection Mounting - Hitachi UTOPIA R32 Series Installation And Operation Manual
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- Technical catalogue (132 pages) ,
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- Installation & operation manual (50 pages)
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Before tightening the flare nut, apply the refrigerant oil (field-supplied) of the same type and brand
that the compressor installed in the outdoor unit is using in thin layer over the flaring part. Do not
apply the oil on other portions. Tighten the flare nut for the liquid pipe to the specified torque with
two spanners. Then, tighten the flare nut for the gas pipe in the same way. After tightening work,
check that there is no refrigerant leakage.
!
CAUTION
For units with air panel be careful that the refrigerant oil does not contact the air panel because it
may cause a crack.
5.3.2 Dimensions of flared pipe
Perform the widening operations in accordance with the measurements shown below.
Diameters (mm)
Ø6.35
Ø9.52
Ø12.7
Ø15.88
Ø19.05
Not possible to perform the widening using pipe. In this case, use a connection with flare fitting.
(1)
5.3.3 Flared connection mounting
Apply a thin layer of oil to the cone opening
for refrigeration systems. Line up the end of
the flared pipe to face the fitting to which it is
to be threaded.
Gently rest the female cone on the male cone
and check that the measurement is correct.
Keep the connection lined up with one hand
and gently thread on the flare nut with the
other.
Tighten the connection to the corresponding
tightening torque indicated in the table.
PMEN0654 rev.0 - 12/2023
Apply refrigerant oil
Apply Refrigerant Oil.
Do not apply the refrigerant
oil to the outside of the
flaring part.
A
(mm)
+0
-0.4
9.1
13.2
16.6
19.7
–
(1)
Nominal diameter
mm
Inches
Ø6.35
1/4
Ø9.52
3/8
Ø12.7
1/2
Ø15.88
5/8
Ø19.05
3/4
Ø22.2
7/8
Ø25.4
1
Ø28.6
1-1/8
90º±2
øA
0.4-0.8R
ø d
Tightening
torque
20 N·m
40 N·m
60 N·m
80 N·m
100 N·m
–
–
–
5
16
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