Hitachi FSG1 Series Technical Catalogue page 298

REFRIGERANT PIPING AND REFRIGERANT CHARGE
13
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13.3.3. SUSPENSION OF REFRIGERANT PIPING
Suspend the refrigerant piping at certain points and prevent
the refrigerant piping from touching the weak part of the
building such as wall, ceiling, etc...
(If touched, abnormal sound may occur due to the vibration
of the piping. Pay special attention in case of short piping
length).
1~15m
Indoor Unit
Do not fix the refrigerant piping directly with the metal fittings
(The refrigerant piping may expand and contract).
Some examples for suspension method are shown below.
For Suspending For Piping Along The
Heavies Wall
13.3.4. TIGHTENING TORQUE
1. Flaring connections (smaller than a diameter of Ø19.05)
are generally used. However, if incorrect flaring is
performed, it will cause serious refrigerant leakage.
2 Shape after Flaring, it should be rectangular and flat, and
no uneven thickness, cracks and scratches should exist.
Dimension
Nominal Tube Dia.
Dia. Ød
1/4 6.35
3/8 9.52 13.00
1/2 12.70 16.20
5/8 15.88 19.40
3/4 19.05 23.30
When tightening the flare nuts, use two spanners, as shown
in the figure.
Fire-Proof
Section
Treatment
For Instant Installation
Work
+0.0
A
–0.4
9.00
The required tightening torque is as follows:
§ Indoor Units and CH Unit
Pipe Size Tightening Torque (Nm)
Ø 6.35 mm
Ø 9.53 mm
Ø 12.7 mm
Ø 15.88 mm
Ø 19.5 mm
§ Outdoor Units
Operation of the stop valve should be performed according
to the below figure.
Allen key
(To open or close
the Spindle valve)
C
Check Joint
(Only the charging
hose can be
connected. Tighten
the cap with a
torque of C Nm)
A
RAS-FSG(1)
Flare
Liquid 16 40
5HP
Gas 44 100
Liquid 29.5 40
8HP
Gas 49 -
Liquid 29.5 40
10HP
Gas 49 -
Liquid 29.5 80
16HP
Gas 49 -
Liquid 29.5 80
20HP
Gas 49 -
Liquid 44 100
24HP
Gas 49 -
Liquid 44 100
30HP
Gas 49 -
RAS-FXG(1) A
Flare
Liquid 29.5 40
8HP Gas High 49 100
Gas Low 59
Liquid 29.5 40
10HP Gas High 49 100
Gas Low 59
Liquid 44 80
24HP Gas High 49 -
Gas Low 59
Liquid 44 100
30HP Gas High 49 -
Gas Low 59
20
40
60
80
100
A
CAP
(Tighten the cap with a
torque A Nm
B
CAP
(Tighten the cap with a
torque B Nm when it is Flare
Nut, or apply B Nm torque to
screw of flange)
B C
Screw of Flange
- 9
- 9
- 9
40 to 60 9
- 9
40 to 60 9
- 9
83 to 120 9
- 9
83 to 120 9
- 9
83 to 120 9
- 9
83 to 120 9
B C
Screw of Flange
- 9
- 9
41 to 60 9
- 9
- 9
41 to 60 9
- 9
83 to 120 9
84 to 120 9
- 9
83 to 120 9
84 to 120 9