Caution On Piping Handling; Selection Of Copper And Heat Insulation Materials; Checking For Gas Leakage; Attaching The Connection Pipe - Daikin FTX-N/U Manual

FTX-N/U, FVXS-N, FDMQ-R Series
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.

6-2. Selection of copper and heat insulation materials

When using commercial copper pipes and fittings, 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.
• Be sure to insulate both the gas and liquid piping and observe the insulation dimensions as below.
Gas side
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.
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
insulation tape, making sure there are no
D
gaps.
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.
13
01_EN_3P379970-7B.indd 13
Piping size Minimum bend radius
O.D. 3/8 inch 1-3/16 inch (30mm)
(9.5mm) or more
O.D. 1/2 inch 1-9/16 inch (40mm)
(12.7mm) or more
O.D. 1/4 inch 1-3/16 inch (30mm)
(6.4mm) or more
1)
105
Be sure to
place a cap.
Rain
If no flare cap is
available, cover
the flare mouth
with tape to keep
dirt or water out.
Inter-unit wiring
Gas pipe
Gas pipe
insulation
Piping thickness Thermal insulation size
I.D. 15/32-19/32 inch
(12-15mm)
0.031 inch (0.8mm) I.D. 9/16-5/8 inch
(C1220T-O) (14-16mm)
I.D. 5/16-13/32 inch
(8-10mm)
Check for leakage here.
• Apply soapy water and
• Wipe soapy water off after
2)
Refrigerant Refrigerant
pipe pipe
Slit
Slit
Tape
EDUS091558E
Wall
Liquid pipe
Liquid pipe
Finishing tape
insulation
Thermal insulation
thickness
13/32 inch
(10mm) Min.
check carefully for leaking
gas.
the check is complete.
3)
Refrigerant
pipe
D Insulation
tape
Auxiliary pipe
C: 3P379970-7B
11/12/2015 13:29:58