Hitachi FSG Series, Технический каталог

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13
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REFRIGERANT PIPING AND REFRIGERANT CHARGE
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).
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
Heavies
For Piping Along The
Wall
For Instant Installation
Work
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.
Nominal
Dia.
Tube Dia.
Ød
Dimension
A
1/4 6.35 9.00
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.
The required tightening torque is as follows:
§
Indoor Units and CH Unit
Pipe Size Tightening Torque (Nm)
Ø 6.35 mm 20
Ø 9.53 mm 40
Ø 12.7 mm 60
Ø 15.88 mm 80
Ø 19.5 mm 100
§
Outdoor Units
Operation of the stop valve should be performed according
to the below figure.
B RAS-FSG(1) A
Flare Screw of Flange
C
Liquid 16 40 - 9
5HP
Gas 44 100 - 9
Liquid 29.5 40 - 9
8HP
Gas 49 - 40 to 60 9
Liquid 29.5 40 - 9
10HP
Gas 49 - 40 to 60 9
Liquid 29.5 80 - 9
16HP
Gas 49 - 83 to 120 9
Liquid 29.5 80 - 9
20HP
Gas 49 - 83 to 120 9
Liquid 44 100 - 9
24HP
Gas 49 - 83 to 120 9
Liquid 44 100 - 9
30HP
Gas 49 - 83 to 120 9
B
RAS-FXG(1)
A
Flare Screw of Flange
C
Liquid 29.5 40 - 9
Gas High 49 100 - 9 8HP
Gas Low 59 41 to 60 9
Liquid 29.5 40 - 9
Gas High 49 100 - 9 10HP
Gas Low 59 41 to 60 9
Liquid 44 80 - 9
Gas High 49 - 83 to 120 9 24HP
Gas Low 59 84 to 120 9
Liquid 44 100 - 9
Gas High 49 - 83 to 120 9 30HP
Gas Low 59 84 to 120 9
1~15m
Fire-Proof
Section
Treatment
Indoor Unit
+0.0
–0.4
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
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)