Hitachi UTOPIA RASC Series Installation And Operation Manual page 30

REFRIGERANT PIPING &
REFRIGERANT CHARGE
(Fig. b)
Refrigerant Pressure
For opening and
closing the Spindle
Valve
Closing screw
(Spindle Valve)
Plug of
check
joint only
charging
hose can be
connected.
Tighten the
cap with the
indicated
torque

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.
Flange Piping Connection
¡
(Only for RASC-10HRNE)
- Confirm that the valve is closed.
Prepare a field-supplied bend pipe for liquid line. Connect it to
the liquid valve by flare nut through the square hole of bottom
base.
Cap. Tighten with
the indicated
torque
O-Ring
(rubber)
Flange. Tighten the
bolts with indicated
torque
Field-Supplied
Pipe
Factory-supplied
Pipe flange with
silencer
Field-supplied pipe
- Prepare a field-supplied pipe for gas line. Solder it and the
factory-supplied pipe flange at the outside of the unit.
Connect the pipe flange to gas valve with the factory-supplied
gasket through the square hole of Bottom Base. Do not use
the gasket that had been attached to the unit.
Gas Valve
Remove
Gasket
Flange
11.4. PIPING AND REFRIGERANT CHARGE
11.4.1. REFRIGERANT PIPING LENGTH
The refrigerant piping between the indoor unit and the RASC
unit should be designed using the following chart. Keep the
design point within the dark area of the chart, wich is showing
the applicable height difference according to piping length.
Chart for piping design:
•
RASC-3HVRNE
H(m)
30
20
10
0
-10
-20
20
0 10 30
RASC-5/10H(V)RNE
H(m)
30
20
10
0
-10
-20
20 40
0 10 30
PMML0140A rev.1 - 07/2009
Nut (x2)
Washer (x2)
Gasket
Pipe Flange
Bolts (x2)
L(m)
50
L(m)
30