Hitachi RPC-1.5FSN3 Installation And Operation Manual page 32

rEFrIGErANT PIPING WOrK
15.2.2 Piping connection
1 Open the air inlet grille.
Press and slide the cover of the air inlet grille in the direction of
the arrow with fingers in the holes on the cover.
remove the supporting string from the side plate.
While the air inlet grille is being opened, depress the knobs of
hinge (), push the air inlet grille toward arrow direction () and
remove the air inlet grille.
Hinge
 Push
 Depress
30 PMML0254A rev.4 - 12/2018
Holes
(2 or 3 portions)
Air inlet grille
Side plate
Supporting
string
Depress the knob of
hinge and push the air
inlet grille forward.
2 Perform the flaring work as shown below.
+ 2
90
o o
φA
0.4 ~ 0.8R
φd
3 Use specific flare nut.
4 Check that there are no scratch, chip, deformation, gap, etc.
at the flaring part.
5 Apply the refrigerant oil in a thin layer to the inside of the
flaring part of the pipe before tightening the flare nut. And the
flare nut must be tightened using two spanners according
to the tightening torque as shown in the figure below. The
tightening work will be easier if tightening the flare pipe in
order of the liquid pipe, the gas pipe. Check the leakage of
the refrigerant after the tightening work.
?
n o t e
• If the refrigerant oil attaches to the air panel, it may cause a crack.
Pay attention not to attach.
• Refrigerant oil is field-supplied: [Ethereal Oil FVC50K, FVC68D
(Idemitsu Kousan Co. Ltd.)]
Apply refrigerant oil
Do not apply the
refrigerant oil to the
outside of the flaring
required tightening torque
Pipe size
Ø6.35 (1/4)
Ø9.52 (3/8)
Ø12.7 (1/2)
Ø15.88 (5/8)
!
c a u t i o n
Tighten the flare nuts according to the specified torque. If not, it may
cause the refrigerant leakage.
mm (in.)
+0
diameter (Ød) a
-0.4
6.35 (1/4) 9.1
9.52 (3/8) 13.2
12.7 (1/2) 16.6
15.88 (5/8) 19.7
part.
(JIS B8607)
tightening torque
14 - 18 (N-m)
34 - 42 (N-m)
49 - 61 (N-m)
68 - 82 (N-m)