installing the unit _15
ENGLISH
installing the unit
REFRIGERANT PIPING WORKS
• The piping length between the outdoor unit and the indoor unit may not exceed the allowable piping length.
• The pressure of the R410A is high. Use only certified refrigerant pipe and follow the installation method.
• Use clean refrigerant pipe which there is no harmful ion, oxide, dust, iron content or moisture inside pipe.
•
Use tools and accessories fit on R410A.
Selecting the refrigerant pipe
Tool Work If compatible with conventional tool
Pipe cutter
Refrigerant pipe work
Pipe cutting
Compatible
Flaring tool Pipe flaring
Refrigerant oil
Apply refrigerant oil on flared
part
Ester series oil, alkali
benzene oil or synthetic oil
Torque wrench Connect flare joint with pipe
Compatible
Pipe bender Pipe bending
Nitrogen gas
Air tightening test
Inhibition of oxidization
Brazing tool Pipe brazing
Gauge manifold
Air tightening test ~ additional
refrigerant charging
Vacuuming, charging and
checking operation
Exclusive
Refrigerant charging hose
Vacuum pump Vacuuming unit
Use one which has a check
valve and 5 torr degree of
vacuum.
Electronic scale Compatible
Gas leak detector Gas leak test Exclusive
Flare joint Use indoor unit’s only
Main pipe Equivalent pipe length between outdoor
unit and the farthest indoor unit
Main pipe : from outdoor unit to the first branch joint.
First branch
joint
Outdoor unit Pipe size (O.D) Oil
balancing
pipe size
Ton
HP
Liquid Gas
mm inches mm inches
mm(inches)
6 7.5
Ø9.52 Ø3/8
Ø19.05 Ø3/4
-8 10.0 Ø22.23 Ø7/8
10 12.5
Ø12.70 Ø1/2
Ø28.58 Ø1-1/8
12 15.0
Ø6.35
14 17.5
Ø15.88 Ø5/816 20.0
18 22.5
20 25.0
Ø19.05 Ø3/4 Ø34.93 Ø1-3/8
22 27.5
24 30.0
26 32.5
28 35.0
30 37.5
Select the main pipe of outdoor units with the following
table.
Outdoor unit Pipe size (O.D) Oil
balancing
pipe size
Ton
HP
Liquid Gas
mm inches mm inches
mm(inches)
6 7.5
Ø12.70 Ø1/2
Ø22.23 Ø7/8
-8 10.0
Ø28.58 Ø1-1/8
10 12.5
Ø15.88 Ø5/8
12 15.0
Ø34.93 Ø1-3/8
Ø6.35
14 17.5
Ø19.05 Ø3/416 20.0
18 22.5
20 25.0
Ø22.23 Ø7/8
22 27.5
24 30.0
26 32.5
28 35.0
Ø41.28 Ø1-5/8
30 37.5
Select the main pipe of outdoor units with the following table
when if the farthest indoor unit’s length is over 90m(295´).
• When installing, make sure there is no leakage. When recovering the refrigerant, ground the compressor first before removing the
connection pipe. If the refrigerant pipe is not properly connected and the compressor works with the service valve open, the pipe inhales
the air and it makes the pressure inside of the refrigerant cycle abnormally high. It may cause explosion and injury.
CAUTION
DVM PLUS3_IM_E_31180-1.indd 15 2009-10-16 ｿﾀﾈﾄ 2:10:19
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