Refrigerant Piping Length - Hitachi RCIM-2.0FSN Installation And Operation Manual

Operation of stop valve should be performed according to the figure below:
Spindle valve
Tighten the spindle with 8 N.m torque
Counterclockwise.... Open
Clockwise .... Close
Closed before shipment
Check joint
(Only charging hose can be
connected)
Tighten the cap with 16 N.m
torque.
Cap
Tighten the cap with a torque
below.
(Attach this after work)
Gas Valve: 49 N.m
Liquid Valve: 37 N.m

11.2. REFRIGERANT PIPING LENGTH

The refrigerant piping between the indoor unit and the
outdoor unit should be designed using the beside chart.
Keep the design point within the dark area of the chart,
which is showing the applicable height difference according
to piping length.
In case that a piping length is shorter than 5 meters,
contact the Hitachi dealer.
Stop valve
(Liquid)
Stop valve
(Gas)
REFRIGERANT PIPING & REFRIGERANT CHARGE
Ref. pressure
Refrigerant piping
Hexagonal Wrench
(field supplied
Size: 4 mm)
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.
Piping Length specification:
Height
difference
(m)
When the Outdoor
unit is installed
heigher than
Indoor Unit
When the Outdoor
unit is installed
lower than Indoor
Unit
RAS-2/2.5HVRN1
Total length between
Outdoor Unit and
each Indoor Unit L(m)
19