Hitachi RPC-3.0FSR - 13.2.2 Piping connection

13.2.2 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 ngers in the holes on the cover.
Air inlet grille
Holes
(2 or 3 portions)
Remove the supporting string from the side plate.
Side plate
Supporting
string
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.
 Push
 Depress
Hinge
Depress the knob of
hinge and push the air
inlet grille forward.
2 Perform the aring work as shown below.
0.4 ~ 0.8R
A
d
90
o
+
2
o
45
o
+
2
o
mm (in.)
Diameter (Ød)
+0
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
3 Use specic are nut.
4 Check that there are no scratch, chip, deformation, gap, etc.
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.
? NOTE
• If the refrigerant oil attaches to the air panel, it may cause a crack.
Pay attention not to attach.
• Refrigerant oil is eld-supplied: [Ethereal Oil FVC50K, FVC68D
(Idemitsu Kousan Co. Ltd.)]
Do not apply the
refrigerant oil to the
outside of the aring
part.
Apply refrigerant oil
Required tightening torque (JIS B8607)
Pipe size Tightening torque
Ø6.35 (1/4) 14 - 18 (Nm)
Ø9.52 (3/8) 34 - 42 (Nm)
Ø12.7 (1/2) 49 - 61 (Nm)
Ø15.88 (5/8) 68 - 82 (Nm)
! CAUTION
Tighten the are nuts according to the specied torque. If not, it may
cause the refrigerant leakage.
REFRIGERANT PIPING WORK
PMML0551 rev.4 - 07/2023 - A10762310A
19
EN