Hitachi FSG Série Manuel D'installation page 21

NOTE:
-
Do not install piping in front of the screw of the service
panel. If not, the screw or the service panel can not be
removed.
-
After piping and wiring work are completed, remove two
yellow shipping washers for compressor(s). Fix the pipes
not to apply a force to stop valves and to minimize
vibration.
Piping Connection
For RAS-8FXN(E),10/16/20/24/30 HP
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.
Factory-Supplied Pipe Flange
Solder by Bottom Side up
Prepare a field-supplied bend 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.
13. PIPING AND REFRIGERANT CHARGE
Tightening
Apply the required tightening torque according to the pipe
size or bolt size (see table)
Pipe Size
Torque (N.m)
Ø 6.35mm (1/4)
Ø 9.53mm (3/8)
Ø 12.70mm (1/2)
Ø 15.88mm (1/2)
Ø 19.05mm (3/8)
Bolt for flange 53 to 75 N.m
Tightening work on the flare nut: (use always two
spanners):
Field-Supplied Bend Pipe
Tightening
20 N.m
40 N.m
60 N.m
80 N.m
100 N.m
PIPING AND REFRIGERANT CHARGE
Gas Valve
Remove
Gasket
Flange
Solder the bend pipes and field piping.
For RAS-16FSN/FXN~30FSN/FXN
1 Remove the two shipping washer (yellow-painted)
2 Securely tighten the nuts again
Compressor
Frame
Nut
Evacuation and Refrigerant Charge
Evacuation and refrigerant charging procedure should be
performed according to the following instructions.
-
The stop valve has been closed before shipment.
However, make sure that the stop valves are closed
completely.
-
Connect the indoor unit and the outdoor unit with field-
supplied refrigerant piping.
-
Connect the gauge manifold using charging hoses
with a vacuum pump or a nitrogen cylinder to the
check joints of the liquid line and the gas line stop
valve.
-
Check for any gas leakage at the flare nut connection,
by using nitrogen gas to increase the pressure at
4.15MPa for FSN outdoor units inside of the field-
supplied piping.
-
Operate the vacuum pump for 1 to 2 hours until the
pressure decreases lower than a pressure of 756
mmHg in vacuum.
-
For charging refrigerant, connect the gauge manifold
using charging hoses with a refrigerant charging
cylinder to the check joint of the liquid line stop valve.
-
Charge the proper quantity of refrigerant according to
the piping length (Calculate the quantity of the
refrigerant charge).
17
Gasket
Pipe Flange
Shipping Washer
(Yellow Painted)
Rubber
Isolator 2
Rubber
Isolator 1