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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.
3) Use separate thermal insulation for gas and liquid refrigerant pipes.
Gas side Liquid side
20,25,35 class 50,60 class 71 R410A class 71 R32 class
O.D. 6.4mm
O.D. 9.5mm O.D. 12.7mm O.D. 12.7mm O.D. 15.9mm
Minimum bend radius - 30mm or more
Thickness 0.8mm (C1220T-O) Thickness 0.5mm
Gas pipe thermal insulation
Liquid pipe thermal
insulation
O.D. 9.5mm O.D. 12.7mm O.D. 15.9mm
I.D. 8-10mm
I.D. 10-14mm I.D. 14-16mm I.D. 17-21mm
Thickness ≥13mm Thickness ≥10mm
Gas pipe
Inter-unit wire
Liquid pipe
Drain hose
Finishing tape
Gas pipe
insulation
Liquid pipe
insulation
3P393185-3W.book Page 15 Wednesday, January 25, 2017 5:50 PM
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