Selection Of Copper And Heat Insulation Materials - Daikin R410A Series Installation Manual

Refrigerant Piping Work

2-2. Selection of copper and heat insulation materials

• When using commercial copper pipes and fittings, observe the following:
1) Insulation material: Polyethylene foam
Heat transfer rate: 0.041 to 0.052W/mK (0.035 to 0.045kcal/mh°C)
Refrigerant gas pipe's surface temperature reaches 110°C max.
Choose heat insulation materials that will withstand this temperature.
2) Be sure to insulate both the gas and liquid piping and to provide insulation
dimensions as below.
20,25,35 class
O.D. 9.5mm
O.D. 9.5mm
I.D. 10-14mm
3) Use separate thermal insulation for gas and liquid refrigerant pipes.
15
Gas side
50,60 class 71 R410A class
O.D. 12.7mm O.D. 12.7mm
Minimum bend radius - 30mm or more
Thickness 0.8mm (C1220T-O)
Gas pipe thermal insulation
O.D. 12.7mm
I.D. 14-16mm
Thickness ≥13mm
71 R32 class
O.D. 15.9mm
Liquid pipe thermal
insulation
O.D. 15.9mm
I.D. 8-10mm
I.D. 17-21mm
Thickness ≥10mm
Inter-unit wire
Gas pipe
Gas pipe
insulation
Finishing tape
Drain hose
Liquid side
O.D. 6.4mm
Thickness 0.5mm
English
Liquid pipe
Liquid pipe
insulation