Piping Connection - Hitachi RPC-2.0FSR Installation & Maintenance Manual

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
fingers 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 (
air inlet grille toward arrow direction (
and remove the air inlet grille.
Hinge
Push
2
Depress
1
16
Holes
(2 or 3 Portions)
Air Inlet Grille
Side Plate
Supporting
String
), push the
1
Depress the knob of
hinge and push the air
inlet grille forward.
(2) Perform the flaring work as shown below.
+ 2
90
o
fA
fd
(3) Use specific flare nut.
(4) Check that there are no scratch, chip,
deformation, gap or 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.
* If the refrigerant oil attaches to the service
cover, it may cause a crack. Pay attention
not to attach.
NOTE:
Refrigerant oil is field-supplied.
[ Ethereal Oil FVC50K, FVC68D, FW68H
(Idemitsu Kousan Co. Ltd.) ]
Apply Refrigerant Oil.
)
2
Required Tightening Torque
Pipe Size
f6.35 mm (1/4)
f9.52 mm (3/8)
f12.7 mm (1/2)
f15.88 mm (5/8)
Fig. 5.1 Tightening Work of Flare Nut
Tighten the flare nuts according to the
specified torque. If not, it may cause the
refrigerant leakage.
o
Diameter
(d)
6.35 (1/4)
9.52 (3/8)
0.4 ~ 0.8R
12.7 (1/2)
15.88 (5/8)
Do not apply
the refrigerant
oil to the
outside of the
flaring part.
Tightening Torque
14 - 18 (N-m)
34 - 42 (N-m)
49 - 61 (N-m)
68 - 82 (N-m)
A10762300A-rev.1
mm (in.)
+0
A
-0.4
9.1
13.2
16.6
19.7
(JIS B8607)