Daikin VRV II Series, Design, Installation & Testing Instructions, Page: 34 / 242

Installation Si39-303
28 General Information
3.2.4 Thermal Insulation Work (Refrigerant Piping)
!
Operational steps
Materials
The thermal insulation materials which are used must be well able to withstand the heat from the pipes.
Example:
Heat pump type: Heat resistant polyethylene foam (heat resistance of at least 120°C)
Cooling only: Polyethylene foam (heat resistance of 100°C or more)
Essential Points
of Thermal
Insulation
The insulation of jointed areas such as the soldered, flared or flanged sections should only be carried out
after the successful completion of the air tight test.
Attention should be paid to the unit model and its operating conditions since there are occasions when the
gas and liquid pipes also need to be thermally insulated.
!
Important points
1. The thickness of the thermal insulation material must be determined in the light of the pipe sizes.
2. It will be necessary to increase the values in the above table for top floors or where conditions are hot
and humid.
3. Where a customer supplies his own specifications then these must be adhered to.
4. Where it is anticipated that the air conditioning unit will be operated at external air temperatures of 10°C
or less then thermal insulation will also be required for the liquid pipes.
Refrigerant pipe
work Insulation
(jointed areas)
Insulation (with
the exception of
the jointed
areas)
Air tight test
(V0985)
Pipe size Thickness of insulation material
6.4mm~25.4mm 10mm or more
28.6mm~38.1mm 15mm or more