Selection Of Copper And Heat Insulation Materials - Daikin FTXG25EV1BS 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.
25/35 class
O.D. 9.5mm
Thickness 0.8mm
Gas pipe thermal insulation
25/35 class
I.D. 12-15mm
3) Use separate thermal insulation pipes for gas and liquid refrigerant pipes.
11
Gas side
50 class
O.D. 12.7mm
50 class
I.D. 14-16mm
Thickness 10mm Min.
Liquid side
25/35/50 class
O.D. 6.4mm
Thickness 0.8mm
Liquid pipe thermal insulation
25/35/50 class
I.D. 8-10mm
Inter-unit wiring
Gas pipe
Liquid pipe
Gas pipe Liquid pipe
insulation insulation
Finishing tape
Drain hose
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