Daikin H-Series, Engineering Data

Page: 40 / 108

EDUS04-924A Installation Manual
Room Air Conditioners H-Series 39
Outdoor Unit Installation (2)
4.
Refrigerant piping.
3.
Flaring the pipe end.
1) Cut the pipe end with a pipe cutter.
2) Remove burrs with the cut surface facing
downward so that the chips do not enter
the pipe.
3) Put the flare nut on the pipe.
4) Flare the pipe.
5) Check that the flaring is properly made.
1) Do not use mineral oil on flared part.
2) Prevent mineral oil from getting into the system as this would reduce the lifetime of the units.
3) Never use piping which has been used for previous installations. Only use parts which are delivered with
the unit.
4) Do never install a drier to this R410A unit in order to guarantee its lifetime.
5) The drying material may dissolve and damage the system.
6) Incomplete flaring may cause refrigerant gas leakage.
WARNING
Liquid side
3/8 inch(9.5mm)
24.1-29.4ft
•
lbf
(32.7-39.9N
•
m)
Gas side
5/8 inch(15.9mm)
45.6-55.6ft
•
lbf
(61.8-75.4N
•
m)
Flare nut tightening torque
Liquid side
3/8 inch(9.5mm)
15.9-20.2ft
•
lbf
(21.6-27.4N
•
m)
Gas side
5/8 inch(15.9mm)
35.5-44.0ft
•
lbf
(48.1-59.7N
•
m)
Valve cap tightening torque
Service port cap tightening torque
7.9-10.8ft
•
lbf (10.8-14.7N
•
m)
CAUTION
1) Use the flare nut fixed to the main unit. (To prevent cracking of the flare nut by aged deterioration.)
2) To prevent gas leakage, apply refrigeration oil only to the inner surface of the flare. (Use refrigeration oil
for R410A.)
3) Use torque wrenches when tightening the flare nuts to prevent damage to the flare nuts and gas
leakage.
Align the centers of both flares and tighten the flare nuts 3 or 4 turns by hand. Then tighten them fully
with the torque wrenches.
(Cut exactly at
right angles.) Remove burrs
Set exactly at the position shown below.
A
Flaring
Die
A
0-0.020 inch
(0-0.5mm)
Flare tool for R410A
0.039-0.059 inch
(1.0-1.5mm)
0.059-0.079 inch
(1.5-2.0mm)
Conventional flare tool
Check
Flare’s inner
surface must
be flaw-free.
The pipe end must
be evenly flared in a
perfect circle.
Make sure that the
flare nut is fitted.
Do not apply
refrigeration oil to the
outer surface.
Flare
Apply refrigeration
oil to the inner
surface of the flare.
Do not apply refrigeration
oil to the flare nut avoid
tightening with over torque.
[Apply oil]
Clutch-type
Clutch-type
(Rigid-type)
Wing-nut type
(Imperial-type)