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English
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 dimen-
sions as below.
3) Use separate thermal insulation pipes for gas and liquid refrigerant pipes.
Gas side
Liquid side
Gas pipe thermal insulation
Liquid pipe
thermal
insulation
20/25/35 class
50/60 class
20/25/35 class
50/60 class
O.D. 9.5mm
O.D. 12.7mm
O.D. 6.4mm
I.D. 12-15mm
I.D. 14-16mm
I.D. 8-10mm
Minimum bend radius
Thickness 10mm Min.
30mm or more 40mm or more 30mm or more
Thickness 0.8mm (C1220T-O)
Gas pipe
Liquid pipe
Gas pipe
insulation
Liquid pipe
insulation
Finishing tape
Drain hose
Inter-unit wiring
01_EN_3P171284-2D.fm Page 11 Monday, August 23, 2010 2:33 PM
