Hitachi RAS-1.0PNNBDH1 Installation & Maintenance Manual page 9

Installation instructions
When installing pipe through
the wall, secure a cap at the
end of the pipe.
Incorrect
Correct
Hole Hole
Attach a cap
or vinyl tape.
3.Processing of Refrigerant Piping
(1) Pipe Cutting
·Cut the cooper pipe correctly with pipe cutter.
(2) Burrs Removal
·Completely remove all burrs from the cut cross section of the pipe.
·Put the end of the copper pipe downward to prevent burrs from
dropping in the pipe.
(3) Putting Nut on
·Remove flare nuts attached to indoor and outdoor units, then put
them on pipe having completed burr removal.
(Not possible to put them on after flaring work).
·Flare nut for pipe depends on the diameter of pipe.
(4) Flaring Work
· Perform flaring work with flaring tool as shown below.
(5) Check
· Compare the flared work with the figure below.
· If flare is noted to be defective, cut off the flared section and perform flaring work again.
o
90
Copper pipe
Burr
Spare
reamer
Pipe cutter
4. Piping Connection
(1) Confirm that the valve is closed.
(2) Connect the indoor unit and the outdoor unit with field-supplied
refrigerant piping. Suspend the refrigerant piping at certain points
and prevent the refrigerant piping from touching the weak part of
the building such as wall, ceiling, etc.
(If touched, abnormal sound may occur due to the vibration of the
piping. Pay special attention in case of short piping length.)
(3) Tighten the flare nut with two spanners as shown in the right figure.
(4) Apply the refrigerant oil (field-supplied) thinly at the seat surface of
the flare nut and pipe before connecting and tightening.
And when tightening the flare nut, use two spanners.
(5) Outdoor refrigerant piping should connect with stop valve.
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危 险
C A U T I O N
Do not place the pipe
directly on the ground.
Correct Incorrect
Attach a cap
or vinyl tape.
No good
Good
Tilted Uneven Burred
Flare nut
Copper pipe
Correct Incorrect
Rain water can
enter.
Attach a cap
or vinyl bag with
rubber band.
Flaring tool
Clutch type
Die
Copper pipe
Flare nut
Copper pipe
7
5/8 (15.88)
Wing nut type
Inside is shining without any scratches
Smooth all around
York
Die
Double Spanner
Torque [ lbf ft. (N m)]
Pipe Size [in. (mm)]
1/4 (6.35)
ø
3/8 (9.52)
ø
1/2 (12.7)
ø
5/8 (15.88)
ø
3/4 (19.05)
ø
Tightening Torque for Flare Nut
[Unit: in. (mm)]
Diameter
( )
ø d 1/64 0.4
1/4 (6.35) 11/32 (9.1)
3/8 (9.52) 1/2 (13.2)
1/2 (12.7) 10/16 (16.6)
3/4 (19.7)
ork
W
. .
14.8 (20)
29.5 (40)
44.3 (60)
59.0 (80)
73.8 (100)