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SINCLAIR
(5) Specifications:
Outside Diameter of Copper Pipe (mm)
6.35
9.52
12.7
2.3.2.2 Water Pipe Selection
(1) Selection of PPR water pipe
Generally, PPR pipes are adopted as hot water pipes for their various advantages such as light
weight, corrosion resistance, scaling-free, long service life, easy installation, heat preservation and
energy-saving and good heat resistance. PPR pipes are connected by hot melting. Common series and
specification are listed in the following table.
Nominal Outside
Diameter
Dn
20
25
NOTE: Generally, S4 series pipes are adopted for cool water and S2.5 series pipes are adopted for
hot water.
(2) Selection of condensate water pipe
1)
Rigid PVC pipes are recommended for water drainage as they are easy to purchase and
install.
2)
The certificate of quality and quality inspection report must be provided.
3)
Specifications and wall thickness:
Rigid PVC pipe (PVC-U pipe): dn 32 mm × 2 mm, dn 40 mm × 2 mm, dn 50 mm × 2 mm, where dn
indicates external diameter.
2.3.2.3 Selection of Thermal Insulation Materials
(1) The quality inspection report and certificate of quality must be provided for thermal insulation
materials and products. Technical specifications and performance of these materials and products
must comply with related technical standards and design regulations.
(2) Flexible closed foam rubber and plastic materials are recommended for thermal insulation.
(3) Fire-retardant grade of the thermal insulation materials must be B1 (nonflammable) or A
(noncombustible).
(4) The heat resisting capacity of the thermal insulation materials shall not be lower than 120°C.
(5) Wall thickness of the copper pipe thermal insulation materials shall not be less than 15 mm.
(6) Wall thickness of the PPR pipe thermal insulation materials shall not be less than 10 mm.
AIR SOURCE HEAT PUMP WATER HEATER SERVICE MANUAL
Average Outside Diameter
Maximum
Minimum
20.0
20.3
25.0
25.3
Refrigerant Type
R134a
R410A
R134a
R410A
R134a
R410A
S5
S4
Nominal Wall Thickness
-
2.3
2.3
2.8
22
Minimum Wall Thickness (mm)
0.5
0.8
0.71
0.8
0.8
0.8
Pipe Series
S3.2
S2.5
2.8
3.4
3.5
4.2
S2
4.1
5.1
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