Hitachi UTOPIA R32 Series User Manual

16
PMEN0654 rev.0 - 12/2023
5
FLARED PIPES
REFRIGERANT PIPING AND REFRIGERANT CHARGE
Before ghtening the are nut, apply the refrigerant oil (eld-supplied) of the same type and brand
that the compressor installed in the outdoor unit is using in thin layer over the aring part. Do not
apply the oil on other porons. Tighten the are nut for the liquid pipe to the specied torque with
two spanners. Then, ghten the are nut for the gas pipe in the same way. Aer ghtening work,
check that there is no refrigerant leakage.
Do not apply the refrigerant
oil to the outside of the
aring part.
Apply Refrigerant Oil.
Apply refrigerant oil
! 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 ared pipe
Perform the widening operaons in accordance with the measurements shown below.
Diameters (mm)
A
+0
-0.4
(mm)
Ø6.35 9.1
Ø9.52 13.2
Ø12.7 16.6
Ø15.88 19.7
Ø19.05 –
(1)
0.4-0.8R
45º ± 2º
øA
ø
d
90º±2
(1)
Not possible to perform the widening using pipe. In this case, use a connection with are tting.
5.3.3 Flared connecon mounng
Apply a thin layer of oil to the cone opening
for refrigeraon systems. Line up the end of
the ared pipe to face the ng 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 connecon lined up with one hand
and gently thread on the are nut with the
other.
Tighten the connecon to the corresponding
ghtening torque indicated in the table.
Nominal diameter
Tightening
torque
mm
Inches
Ø6.35 1/4 20 N·m
Ø9.52
3/8
40 N·m
Ø12.7 1/2 60 N·m
Ø15.88
5/8
80 N·m
Ø19.05 3/4 100 N·m
Ø22.2
7/8
–
Ø25.4 1 –
Ø28.6
1-1/8
–

Hitachi UTOPIA R32 Series Specifications

General

Brand	Hitachi
Model	UTOPIA R32 Series
Category	Air Conditioner
Language	English