Hitachi CH-Box - 5 Refrigerant Piping Work; Refrigerant Piping

When installing pipe through
the wall, secure a cap at the
end of the pipe.
Correct
CorrectIncorrect Incorrect
Correct Incorrect
HoleHole
Attach a cap
or vinyl tape.
Attach a cap
or vinyl tape.
Attach a cap
or vinyl bag with
rubber band.
Do not place the pipe
directly on the ground.
Rain water can
enter.
1/64 ~ 1/32R
fA
fd
90
o
+
2
o
45
o
+
2
o
P5417025-rev.1
11
Use the specied non-ammable refrigerant
(R410A) for the outdoor unit in the refrigerant
cycle. Do not charge material other than
R410A into the unit such as hydrocarbon
refrigerants (propane or something similar),
oxygen, ammable gases (acetylene or etc.) or
poisonous gases when installing, maintaining
and moving. These ammables are extremely
dangerous and may cause an explosion, a re,
and injury.
● FlaringDimension
Performthearingworkasshownbelow.
● JointSelection
Whenusing1/2Hmaterialandthearingwork
isnotavailable.Inthisinstance,useajoint
selectedfromthechartbelow.
(
T
)Itisimpossibletoperformthearing
workwith1/2Hmaterial.Inthiscase,
useanaccessorypipe(withaare).
5.1 RefrigerantPiping
● Cautions for Refrigerant Pipe Work (Example)
(1) Preparelocally-suppliedcopperpipes.
(2) Selectcleancoppertubesmakingsurethere
isnodustormoistureinsidethetubes.
Beforeconnectingpipes,blowtheinsideof
thetubeswithnitrogenordryair,toremove
anydustorforeignmaterials.
(3) Selectthepipingsizeasshowninthetables
below.Furthermore,checkfortheare
nutandaringdimensionaccordingtothe
followinggureandtable.
5. Refrigerant Piping Work
NOTE:
Donotuseajointotherthanthosespeciedin
thetableabove.
B
Flare Nut
MinimumThicknessofJoint
mm(inch)
Diameter R410A
6.35 (1/4) 0.5 (0.020)
9.52 (3/8) 0.6 (0.024)
12.7 (1/2) 0.7 (0.028)
15.88 (5/8) 0.8 (0.031)
19.05 (3/4) 0.8 (0.031)
22.2 (7/8) 0.9 (0.035)
25.4 (1) 0.95 (0.037)
28.58 (1-1/8) 1.0 (0.039)
31.75 (1-1/4) 1.1 (0.043)
38.1 (1-1/2) 1.35 (0.053)
41.28 (1-5/8) 1.45 (0.057)
FlareNutDimensionB mm(
inch)
Diameter R410A
6.35 (1/4) 17 (11/16)
9.52 (3/8) 22 (7/8)
12.7 (1/2) 26 (1)
15.88 (5/8) 29 (1-1/8)
19.05 (3/4) 36 (1-7/16)
mm(inch)
Diameter
(ɸd)
A
+0
-0.4(-0.02)
R410A
6.35 (1/4) 9.1 (0.36)
9.52 (3/8) 13.2 (0.52)
12.7 (1/2) 16.6 (0.65)
15.88 (5/8) 19.7 (0.78)
19.05 (3/4) (
T
)