Hitachi RPC-3.0FSN3 - Piping Connection

P5416543
17
Do not apply
the refrigerant
oil to the
outside of the
aring part.
(3) Use specic are nut.
(4) Check that there are no scratch, chip,
deformation, gap or at the aring part.
(5) Apply the refrigerant oil in a thin layer to the
inside of the aring part of the pipe before
tightening the are nut. And the are nut
must be tightened using two spanners
according to the tightening torque as shown
in the gure below. The tightening work will
be easier if tightening the are pipe in order
of the liquid pipe, the gas pipe.
Check the leakage of the refrigerant after the
tightening work.
* If the refrigerant oil attaches to the air panel,
it may cause a crack. Pay attention not to
attach.
NOTE:
Refrigerant oil is eld-supplied.
[ Ethereal Oil FVC50K, FVC68D
(Idemitsu Kousan Co. Ltd.) ]
Fig. 5.1 Tightening Work of Flare Nut
Required Tightening Torque (JIS B8607)
Pipe Size Tightening Torque
f
6.35 mm (1/4) 14 - 18 (N-m)
f
9.52 mm (3/8) 34 - 42 (N-m)
f
12.7 mm (1/2) 49 - 61 (N-m)
f
15.88 mm (5/8) 68 - 82 (N-m)
Tighten the are nuts according to the
specied torque. If not, it may cause the
refrigerant leakage.
mm (in.)
Diameter
(
f
d)
A
+0
-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
(2) Perform the aring work as shown below.
5.2.2 Piping Connection
(1) Open the air inlet grille and perform the
connecting work from lower side.
(a) Press and slide the cover of the air inlet
grille in the direction of the arrow with
ngers in the holes on the cover.
(b) Remove the supporting string from the
side plate.
(c) While the air inlet grille is being opened,
depress the knobs of hinge (
1
), push the
air inlet grille toward arrow direction (
2
)
and remove the air inlet grille.
Apply Refrigerant Oil.
0.4 ~ 0.8R
fA
fd
90
o
+
2
o
45
o
+
2
o
Holes
(2 or 3 Portions
)
Air Inlet Grille
Side Plate
Supporting
String
Hinge
Depress the knob of
hinge and push the ai
r
inlet grille forward.
Depress
Push
1
2