Refrigerant Piping Work; Selection Of Copper And Heat Insulation Materials; Flaring The Pipe End - Daikin 2MXS18NMVJU Manuel D'installation

Outdoor Unit Installation
7.

Refrigerant piping work

7-1. Cautions on pipe handling
• Protect the open end of the pipe against dust and moisture.
• All pipe bends should be as gentle as possible. Use a pipe bender for
bending.

7-2. Selection of copper and heat insulation materials

When using commercial copper pipes and fittings, observe the following:
• Insulation material: Polyethylene foam
H eat 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.
• 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.
8.

Flaring the pipe end

1) Cut the pipe end with a pipe cutter.
2) Remove burrs with the cut surface facing downward
so that the chips do not enter the pipe.
3) Put the flare nut on the pipe.
4) Flare the pipe.
5) Check that the flaring is properly made.
WARNING
• Do not use mineral oil on flared part.
• Prevent mineral oil from getting into the system as this would reduce the lifetime of the units.
• Never use piping which has been used for previous installations. Only use parts which are delivered with the unit.
• Never install a drier to this R410A unit in order to guarantee its lifetime.
• The drying material may dissolve and damage the system.
• Incomplete flaring may cause refrigerant gas leakage.
11
Piping size Minimum bend radius
1-3/16 inch (30mm)
O.D. 3/8 inch
(9.5mm) or more
O.D. 1/2 inch 1-9/16 inch (40mm)
(12.7mm) or more
O.D. 5/8 inch 1-15/16 inch (50mm)
(15.9mm) or more
O.D. 1/4 inch 1-3/16 inch (30mm)
(6.4mm) or more
Rain
Thermal insulation size Thermal insulation
Piping thickness
I.D. 15/32-19/32 inch
(12-15mm)
0.031 inch (0.8mm)
(C1220T-O)
I.D. 9/16-5/8 inch
(14-16mm)
0.039 inch (1.0mm) I.D. 5/8-13/16 inch
(C1220T-O) (16-20mm)
0.031 inch (0.8mm) I.D. 5/16-13/32 inch
(C1220T-O) (8-10mm)
Cut exactly at
right angles. Remove burrs.
Set exactly at the position shown below.
Flare tool for R410A
A
Clutch-type
0-0.020 inch
Die A
(0-0.5mm)
Be sure to
place a cap.
If no flare cap is
available, cover
the flare mouth
with tape to keep
dirt and water out.
Inter-unit wire
Gas pipe
Liquid pipe
Gas pipe
Liquid pipe
insulation
insulation
Finishing tape
Drain hose
thickness
13/32 inch
(10mm) Min.
Check
The pipe end must
Flare's inner be evenly flared in
a perfect circle.
surface must
be flaw-free.
Make sure that the
flare nut is fitted.
Flaring
Conventional flare tool
Clutch-type (Rigid-type) Wing-nut type (Imperial-type)
0.039-0.059 inch 0.059-0.079 inch
(1.0-1.5mm) (1.5-2.0mm)
■
Wall
English