Daikin FLXS25BVMB Installation Manual page 13

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.
Gas side
20/25/35 class
O.D. 9.5mm
Minimum bend radius
30mm or more 40mm or more 30mm or more
Thickness 0.8mm (C1220T-O)
3) Use separate thermal insulation pipes for gas and liquid refrigerant pipes.
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Liquid side
50/60 class
O.D. 12.7mm O.D. 6.4mm
Gas pipe thermal insulation
20/25/35 class 50/60 class
I.D. 12-15mm I.D. 14-16mm
Thickness 10mm Min.
Inter-unit wiring
Gas pipe
Liquid pipe
Gas pipe
Liquid pipe
insulation
insulation
Finishing tape
Drain hose
Liquid pipe
thermal
insulation
I.D. 8-10mm
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