Hitachi HRNM Serie Installations- Und Betriebshandbuch Seite 35

12.1.4. TIGHTENING
Tightening work on the flare nut
Operation of stop valve should be performed according to the figure below.
Valve
Unit
Type
Liquid Fig.A
RAS-8
Gas Fig.B
Liquid Fig.A
RAS-10
Gas Fig.B
Liquid Fig.A
RAS-12
Gas Fig.B
(*) Select the piping size of the Ø12.7 (1/2") when the length is more than 70m (Only RAS-8)
CAP
Fig.A
Tighten the cap with a
torque of (C)
Check joint
(Only the Charging those
can be connected)
Refrigerant
Pressure
Seat surface
(Fully closed
position)
CAP Tighten the cap
with a torque of (A)
CAUTION:
Do not apply force to the spindle valve at the end of opening (5 N.m or smaller). The back seat construction is not
provided.
At the test run, fully open the spindle. If not fully opened, the devices will be damaged.
Do not apply two spanners at
this position
Use two spanners
here to squeeze
flare nut
Stop Valve
Size
(mm)
Hexagonal
Pipe Wrench
(Hex1)
Ø9.53 (3/8")* 4
Ø25.4 (1") 10
Ø12.7 (1/2") 4
Ø25.4 (1") 10
Ø12.7 (1/2") 4
Ø25.4 (1") 10
Closed before
shipment
Spindle Valve
Counterclockwise - Open
Clockwise - Close
Hex 1
(To open or
close spindle
valve)
O-Ring
(rubber)
CAP
Tighten the cap with
(Only the charging hose can be connected).
a torque of (B)
Refrigerant Piping
(Field supplied)
PIPING AND REFRIGERANT CHARGE
Tightening torque
(N.m)
A B
40 37
53 to 75 49
60 37
53 to 75 49
60 37
53 to 75 49
Ref. Pressure
Cap
Tighten the cap with a torque of (B)
(Attach this after work
)
Hex1
(To open or close
spindle
valve)
Spindle Valve
Counterclockwise - open
Clockwise.-.closed
Closed before shipment
Check Joint
Tighten the cap with a torque of (C
)
C
16
9.8
16
9.8
16
9.8
Fig.B
O-Ring
(rubber)
Flange
Tighten the bolts for flange with a
tightening torque of (A)
Refrigerant Piping
(Field supply
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