Daikin R410A Split Series Installation Manual page 18

Refrigerant Piping Work
Cautions on piping handling
• Protect the open end of the pipe from dust and moisture.
• All pipe bends should be as gentle as possible. Use a pipe bender for
bending.
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 pipe only.
• Be sure to insulate both the gas and liquid piping and observe the insulation dimensions as below.
Piping size
O.D. 3/8 inch
O.D. 1/2 inch
Gas side
(12.7mm)
O.D. 5/8 inch
(15.9mm)
O.D. 1/4 inch
Liquid side
• Use separate thermal insulation pipes for gas and liquid refrigerant pipes.
• Make absolutely sure to execute thermal insulation works on the pipe-connecting section, after checking for gas leakage,
by thoroughly studying the following figures and using the included thermal insulating materials D fitting insulation and
E fitting insulation. Fasten both ends with the H clamps.
• Make sure to bring the seam of D fitting insulation and E fitting insulation to the top.
Piping insulation procedure
Gas piping
E Fitting insulation
(for gas pipe)
Gas
piping
H Clamps
(use 2 clamps per insulation)
Wrap over from the base of the unit
to the top of the flare nut connection
G Sealing pad (medium)
CAUTION
Be sure to insulate any field piping all the way to the piping connection inside the unit. Any exposed piping may cause
condensation or burns if touched.
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Minimum bend radius
1-3/16 inch (30mm)
(9.5mm) or more
1-9/16 inch (40mm)
or more
1-15/16 inch (50mm)
or more
1-3/16 inch (30mm)
(6.4mm) or more
Flare nut connection D
Main unit
H
Attach to base
Piping thickness
0.031 inch (0.8mm)
(C1220T-O)
0.039 inch (1.0mm)
(C1220T-O)
0.031 inch (0.8mm)
(C1220T-O)
Liquid piping
Fitting insulation Flare nut connection
(for liquid pipe)
Liquid
piping
Clamps
(use 2 clamps per insulation) Attach to base
Wrap over from the base of the unit
to the top of the flare nut connection
G Sealing pad (medium)
Be sure to
place a cap.
Rain
If no flare cap is
available, cover the
flare mouth with
tape to keep dirt
and water out.
Gas pipe
Gas pipe
insulation
Finishing tape
Thermal insulation size
I.D. 15/32-19/32 inch
(12-15mm)
I.D. 9/16-5/8 inch
(14-16mm)
I.D. 5/8-13/16 inch
(16-20mm)
I.D. 5/16-13/32 inch
(8-10mm)
H Clamps (use 2 clamps
per insulation)
Main unit
D Fitting insulation
(for liquid pipe)

Wall
Liquid pipe
Liquid pipe
insulation
Drain hose
Thermal insulation
thickness
13/32 inch
(10mm) Min.
E
Fitting insulation
(for gas pipe)
H
Clamps
(use 2 clamps
per insulation)
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