REFRIGERANT PIPING & REFRIGERANT CHARGE
19
Operation of stop valve should be performed according to the figure below:
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.
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.
Piping Length specification:
RAS-2/2.5HVRN1
Height
difference
(m)
Total length between
Outdoor Unit and
each Indoor Unit
L(m)
When the Outdoor
unit is installed
heigher than
Indoor Unit
When the Outdoor
unit is installed
lower than Indoor
Unit
Stop valve
(Liquid)
Stop valve
(Gas)
Check joint
(Only charging hose can be
connected)
Tighten the cap with 16 N.m
torque.
Spindle valve
Tighten the spindle with 8 N.m torque
Counterclockwise…. Open
Clockwise …. Close
Closed before shipment
Ref. pressure
Refrigerant piping
Hexagonal Wrench
(field supplied
Size: 4 mm)
Cap
Tighten the cap with a torque
below.
(Attach this after work)
Gas Valve: 49 N.m
Liquid Valve: 37 N.m
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