Hitachi UTOPIA RASC Series Installation And Operation Manual page 29

REFRIGERANT PIPING &
REFRIGERANT CHARGE
11.3. PIPING CONNECTION FOR RASC UNIT
1. Stop Valve are located on rear cover side of unit. Before
connecting refrigerant piping, the stop valve protection cover
shall be removed.
RASC-3/5HVRNE
−
RASC-10HRNE
−
2. It is recommended to use a tube bender for pipe bending work.
Gas valve
Liquid valve
Gas valve
Liquid valve
3. For gas pipe connection, use the factory supplied Flange Pipe
(Only for RASC-10HRNE).
Tightening Torque
¡
See tighten torque in the next table:
Valve
Pipe
size
9.53
RASC-3/5HVRNE Fig. a
(3/8")
12.7
RASC-10HRNE Fig. a
(1/2")
15.88
RASC-3/5HVRNE Fig. a
(5/8")
25.4
RASC-10HRNE Fig. b
(1")
(*) Flange connection, check specific instruction on flange piping connection
paragraph.
(Fig. a)
For opening and
closing the Spindle
Valve
O-Ring (Rubber)
Seat Surface
(When fully closed)
Plug of
check
joint only
charging
hose can be
connected.
Tighten the
cap with the
indicated
torque
PMML0140A rev.1 - 07/2009
96
Ø25.4ID(1")
Size Tightening torque (N.m)
Allen
Wrench A B C
size
4 mm 8 16.5 40
5 mm 8 38 40
5 mm 10 30 80
10 mm 25 49 55~75(*)
Allen Wrench
Cap. Tighten with the
indicated torque
Closing screw
(Spindle Valve)
Flare. Tighten with the
indicated torque
Refrigerant
pressure
29
D
14~18
9.8
14~18
9.8