Chapter Ⅱ Installation（2. Preparation Before Installation）
9
installation personnel should seek confirmation from the designer and make a Design Alteration
Record in written form.
2.3 Selection of Installation Materials
2.3.1 Notices for Selecting Installation Materials
1）If the brand and dimension of installation materials are designated, users should purchase
the materials according to the requirements; if there are no designated installation materials, the
materials purchased by users must be in accordance with the local criterion and quality
requirement.
2）The materials, equipments and appliances for installation should have certificate of
qualification or inspection report;
3）Products with fire control requirement should have fire control inspection certificate and
should comply with local and related compulsory standards;
4）If it is required to use eco-friendly materials, all the materials must comply with the local
eco-friendly requirements and should provide related certificates.
2.3.2 Requirements for selecting Installation Materials
It is suggested to use PPR pipe as the hot water system pipelines. PPR pipes can be easily
installed and connected, the material and fittings can be expediently purchased; it will not produce
welding slag or other waste materials during the installation, and will not product rust and course
bad water quality during the using of unit.
The design pressure of polypropylene random copolymer pp-r (PP-R) pipeline system should
not be greater than 1.0 MPa, and design temperature should not be less than 0℃ and should not
be higher than 70℃.
1）Heat-insulating materials and their products must have product quality6 inspection report
and leave factory certificate of qualification.
2）Heat insulating material is suggested to use flexible close type foaming rubber and plastic
heat insulating material;
3）Burning rating of heat insulating material is required to be B1 level or A level;
4）Refractoriness of heat insulating should not be less than 120℃.
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