Hitachi Primairy Series Installation & Maintenance Manual page 17

INSTALLATION INSTRUCTIONS
When installing pipe through the wall,
secure a cap at the end of the pipe.
Correct
Attach a cap or
vinyl tape.
3 Processing of refrigerant piping
1. Pipe cutting
Cut the copper pipe correctly with a pipe cutter.
2. Burrs removal
Completely remove all burrs from the 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 burrs removed pipe.
(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.
Burr Copper pipe
Spare
reamer
13 HO2019292HA
Do not place the pipe directly on the
Incorrect Correct
Attach a cap or
No good
Good
Tilted Uneven Burred
o
90
Flare nut
Pipe
Copper pipe
cutter
! CAUTION
ground.
Incorrect
vinyl tape.
Flaring tool
Clutch type
Die
Flare
Copper pipe
nut
Correct Incorrect
Rain water
can enter
Attach a cap or vinyl
bag with rubber band.
Diameter ∅d
6.35
9.52
12.7
15.88
Wing nut type
Inside is shining without any scratches
Smooth all
around
Yoke
Die
Copper
pipe
(Unit: mm)
A +0
-0.4
9.1
13.2
16.6
19.7