P5417054
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6. Refrigerant Piping Work
Table 6.1 Piping Size
inch (mm)
Model
Gas Piping
Liquid Piping
(H,Y,C)IC4008B21S
(H,Y,C)IC4012B21S
(H,Y,C)IC4015B21S
1/2 (12.7)
1/4 (6.35)
(H,Y,C)IC4018B21S
(H,Y,C)IC4024B21S
(H,Y,C)IC4030B21S
(H,Y,C)IC4036B21S
(H,Y,C)IC4048B21S
5/8 (15.88)
3/8 (9.52)
3.
Prepare field-supplied copper pipes.
4. Select clean copper pipes. Make sure there is no dust and moisture inside.
5. The refrigerant lubricating oil used in these units is Polyvinylether (PVE), a chemically stable, resilient,
synthetic lubricant that, when combined with refrigerant R410A, maintains its compatibility, lubricity,
and viscosity over extended periods of time and is impervious to heat, oxidation, moisture absorption
and breakdown as long as it remains in a sealed system. Its chemical properties will remain intact only
so long as moisture is not introduced into the system.
The gaseous element, PVE is a moisture magnet that, once exposed to open air and can
quickly become saturated with moisture, lose its lubricity, and become useless. Minimize
exposure to the open air, over the summer months, and in southern or tropical climates.
6. When cutting piping, do not use conventional tools such as saws or grinding wheel cutting disks that
produce harmful metallic filings and burrs that can damage a refrigerant system. Use a copper tube
cutter to eliminate metal filings produced by the cutting operation. After the cut is made, blow out each
pipe with dry compressed air or nitrogen to remove this residue before making pipe connections.
6.1 Piping Materials
1. Tolerances of refrigerant piping lengths depend on the combination with the outdoor unit.
Refer to the "Installation and Maintenance Manual" for the outdoor unit.
2. Select the piping size from the following table.
For details of refrigerant piping work, vacuum pump and refrigerant charging, refer to the "Installation and
Maintenance Manual" for the outdoor unit.
inch (mm)
Diameter
(d)
A +0
-0.02 (-0.4)
1/4 (6.35)
0.36 (9.1)
3/8 (9.52)
0.52 (13.2)
1/2 (12.7)
0.65 (16.6)
5/8 (15.88)
0.78 (19.7)
1.
Perform the flaring work as shown below.
6.2 Piping Connection
Use the specified non-flammable refrigerant (HFC R410A) for the outdoor unit refrigerant cycle. Do
not charge the unit with anything other than HFC R410A, such as hydrocarbon refrigerants (propane
and Isobutene), oxygen, and other flammable gases (acetylene, ammonia, and so forth), or any
poisonous gases when installing, maintaining and moving the unit. These substances are volatile
and dangerous and can result in fire, explosion, and serious or fatal injuries.
In Case of Getting the Pipe
Through a Hole in the Wall
Correct
Correct
Incorrect
Incorrect
Correct
Incorrect
Hole
Hole
Attach a cap or put a plastic bag
over the pipe end.
Attach a cap or put a plastic
bag over the pipe end.
Attach a cap or put a plastic
bag over the pipe end.
Rubber Band
Do not lay the pipe
directly on the ground.
Rain water
can come in.
In Case of Rain
0.4 ~ 0.8R
f
A
f
d
90
o
+ 2
o
45
o
+ 2
o
