Daikin REYQ168 Installation Manual download pdf (Page 37)

SiUS39-506 Installation

General Information 31

3.2.4 Thermal Insulation Work (Refrigerant Piping)

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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.

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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. (Refer to Installation manual "6-5 Pipe insulation" for more detail)

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 in. (mm) Thickness of insulation material

φ1/4~φ1 (6.4mm~25.4mm) φ1/2 or more (12.5mm or more)

1 2 ... 32 33 34 35 36 37 38 39 40 41 42 ... 247 248

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Daikin REYQ168 Installation Manual Page 37