Hitachi YUTAKI S Serie Manuel D'installation page 26

(b) Bottom Side Piping Work
After removing bottom of the piping cover, perform piping
and wiring works.
Liquid Piping
Screw

NOTE:
Prevent the cables from coming into direct contact
(c) Rear Piping Work
After removing rear piping cover, punch out the "C" holes
along the guide line.
Operation of stop valve should be performed according to the figure below.
Unit
RAS-8.0HRNME-AF
RAS-10.0HRNME-AF
(*) Select the piping size of the Ø12.7 (1/2") when the length is more than 70m (Only RAS-8)
Fig. A
CAP
Tighten the cap with
a torque of (C)
Check joint
(Only the Charging those
can be connected)
Refrigerant
Pressure
Seat surface
(Fully closed
position)
CAP Tighten the cap
with a torque of (A)

CAUTION:
Confirm that there is no refrigerant leakage of the piping connections.
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.
28
PMML0215A rev.1 - 02/2012
Conduit
Gas Piping
Bottom Side Piping Hole
Bottom Base
Piping Cover
Rear cover
C
Valve
Type Pipe
Liquid Fig. A Ø9.53 (3/8")*
Gas Fig. B Ø25.4 (1")
Liquid Fig. A Ø12.7 (1/2")
Gas Fig. B Ø25.4 (1")
Closed before shipment
Spindle Valve
Counterclockwise - Open
Clockwise - Close
→
Hex 1
(To open or
close spindle
valve)
O-Ring
CAP
(rubber)
Tighten the cap with
a torque of (B)
Refrigerant Piping
(Field supplied)
Stem
Ring
Pin
Stopper
Stem position at open

NOTES:
To avoid damage protect cables and pipes with adequate
insulation (Field-Supplied).
After connecting the refrigerant piping, seal the open space
−
between knockout hole and refrigerant pipes by using
insulation material.
Confirm that the valve is closed.
−
Prepare a field-supplied bend pipe for liquid and gas line.
−
Connect it to the liquid valve by flare nut through the square
hole of bottom base.
10.1.4. TIGHENING
Tightening work on the flare nut
Flate nut
connection
of indoor
unit slide.
Two spanners work
Size (mm)
Hexagonal Wrench
(Hex1)
4
10
4
10
Fig. B
Tighten the cap with
the torque of (B)
O-Ring
(rubber)
Check Joint
Only the charging hose can
be connected. Tighten the
cap with the torque of (C)
Flare Nut
Connection Ø19.05
Accessory
pipe
Field Refrigerant
piping brazing
connection
Attaching Detail for ring
Ring
Stem position
Stopper
Pin
at close
PIPING AND
REFRIGERANT CHARGE
Stop valve of Outdoor unit
Never apply
a force here
by spanner. If
not, refrigerant
leakage may
occur
Tightening torque (N.m)
A B
40 37
53 to 75 30
60 37
53 to 75 30
Refrigerant
Do not apply two
Pressure
spanners at this
Tighten the
portion. If applied,
flare nut with
leakage will occur.
the torque
of (A)
Use two
spanners here to
squeeze flare nut
Use this accessory pipe for the regrigerant
piping work. If not, the operation sound
of the indoor units may be increased
depending on the installation conditions
and field-supplied refrigerant piping can
not connect to the outdoor unit gas valve.
Stop valve
Flare nut
C
16
13
16
13