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13 ■English
Indoor Unit Installation
6-1. Caution on piping handling
1) Protect the open end of the pipe against dust and moisture.
2) All pipe bends should be as gentle as possible. Use a pipe
bender for bending.
Wall
If no flare cap is
available, cover
the flare mouth
with tape to keep
dirt or water out.
Be sure to
place a cap.
Rain
6-2. Selection of copper and heat insulation materials
When using commercial copper pipes and ttings, observe the following:
• Insulation material: Polyethylene foam
Heat transfer rate: 0.041 to 0.052W/mK (0.024 to 0.030Btu/fth°F
(0.035 to 0.045kcal/mh°C))
Be sure to use insulation that is designed for use with HVAC Systems.
• ACR Copper only.
Liquid pipe
Gas pipe
Gas pipe
insulation
Liquid pipe
insulation
Finishing tape
Inter-unit wiring
• Be sure to insulate both the gas and liquid piping and observe the insulation dimensions as below.
Gas side
Piping size
O.D. 3/8 inch
(9.5mm)
O.D. 1/2 inch
(12.7mm)
O.D. 1/4 inch
(6.4mm)
1-3/16 inch (30mm)
or more
1-9/16 inch (40mm)
or more
1-3/16 inch (30mm)
or more
0.031 inch (0.8mm)
(C1220T-O)
I.D. 15/32-19/32 inch
(12-15mm)
I.D. 9/16-5/8 inch
(14-16mm)
I.D. 5/16-13/32 inch
(8-10mm)
13/32 inch
(10mm) Min.
Minimum bend radius Piping thickness Thermal insulation size
Thermal insulation
thickness
Liquid side
• Use separate thermal insulation pipes for gas and liquid refrigerant pipes.
7. Checking for gas leakage
1) Check for leakage of gas after air purging.
2) Refer to the section on pressure test and
evacuating system in the installation manual
for the outdoor unit.
Check for leakage here.
• Apply soapy water and
check carefully for leaking
gas.
• Wipe soapy water off after
the check is complete.
8. Attaching the connection pipe
• Attach the pipe after checking for gas leakage,
described above.
1) Cut the insulated portion of the on-site piping,
matching it up with the connecting portion.
2) Secure the slit on the refrigerant piping side
with the butt joint on the auxiliary piping using
the tape, making sure there are no gaps.
3) Wrap the slit and the butt joint with the
D
insulation tape, making sure there are no
gaps.
Refrigerant
pipe
Refrigerant
pipe
Refrigerant
pipe
2)1) 3)
Auxiliary pipe
Slit
Slit
Tape
Insulation
tape
D
CAUTION
• Insulate the joint of the pipes securely.
Incomplete insulation may lead to water leakage.
• Push the pipe inside so it does not place undue force on the front grille.
01_EN_3P379970-7B.indd 13 11/12/2015 13:29:58
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