Refrigerant Piping - Daikin 4MXL36TVJU 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.
O.D. φ3/8 inch (9.5mm)
O.D. φ1/2 inch (12.7mm)
Gas pipe
O.D. φ5/8 inch (15.9mm)
O.D. φ1/4 inch (6.4mm)
Liquid pipe
Width across flats
Valve cap tightening torque
Service port cap tightening torque
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.
• 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.
9
Apply oil
Piping size
24-1/8 – 29-1/2ft • Ibf (32.7-39.9N • m)
36-1/2 – 44-1/2ft • lbf (49.5-60.3N • m)
45-5/8 – 55-5/8ft • lbf (61.8-75.4N • m)
10-1/2 – 12-3/4ft • lbf (14.2-17.2N • m)
3/4 inch (19mm)
12-5/8 – 15-3/8ft • lbf
(17.0-21.0N • m)
8 – 10-7/8ft • lbf
(10.7-14.7N • m)
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
Apply refrigeration
oil only to the inner
surface of the flare.
Flare nut tightening torque
7/8 inch (22mm)
16-1/4– 19-7/8ft • lbf
(22.0-27.0N • 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
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)
13/32 inch
(10mm) Min.
I.D. 5/8-13/16 inch
(16-20mm)
I.D. 5/16-13/32 inch
(8-10mm)
Wall
Liquid pipe
Liquid pipe
insulation
Drain hose
thickness
■
English