Refrigerant Piping - Daikin 2MXS18WMVJU9 Installation Manual

Outdoor Unit Installation
4.

Refrigerant piping

CAUTION
• Use the flare nut fixed to the main unit. (This is to prevent the flare nut from cracking as a result of deterioration over time.)
• To prevent gas leakage, apply refrigeration oil only to the inner surface of the flare. (Use refrigeration oil for R410A.)
• Use a torque wrench when tightening the flare nuts to prevent damage to the flare nuts and gas leakage.
• Align the centers of both flares and tighten the flare nuts 3 or 4 turns by hand, then tighten them fully with a spanner and a
torque wrench.
Do not apply refrigeration
oil to the outer surface.
Flare nut
Do not apply refrigeration oil to
the flare nut to avoid tightening
with excessive torque.
Tightening torque
Piping connection
Gas side
3/8 inch (9.5mm) 1/2 inch (12.7mm)
24-1/8 – 29-1/2lbf • ft 36-1/2– 44-1/2lbf • ft
(32.7-39.9N • m) (49.5-60.3N • m)
Cautions on pipe 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 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.
• Using finishing tape, bundle and wrap the indoor unit piping and drain hose together so that the drain hose is below
the other piping.
9
Apply oil
Flare nut
5/8 inch (15.9mm)
45-5/8– 55-5/8lbf • ft
(61.8-75.4N • m)
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. 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
Apply refrigeration
oil only to the inner
surface of the flare.
Valve cap
Liquid side 3/4 inch (19mm)
1/4 inch (6.4mm)
12-5/8 – 15-3/8lbf • ft
(17.0-20.9N • m)
10-1/2 – 12-3/4lbf • ft
(14.2-17.2N • m)
Piping thickness
0.031 inch (0.8mm)
(C1220T-O)
0.039 inch (1.0mm)
(C1220T-O)
0.031 inch (0.8mm)
(C1220T-O)
Tighten
Torque wrench
Spanner
Piping union
Flare nut
Width across flats
7/8 inch (22mm)
16– 20-1/4lbf • ft
(21.6-27.4N • m)
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 Thermal insulation
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)
Service port cap
8 – 10-7/8lbf • ft
(10.7-14.7N • m)
Wall
Liquid pipe
Liquid pipe
insulation
Drain hose
thickness
13/32 inch
(10mm) Min.
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English