Page 514 - The City and Guilds Textbook: Plumbing Book 1 for the Level 3 Apprenticeship (9189), Level 2 Technical Certificate (8202) and Level 2 Diploma (6035)

The City & Guilds Textbook: Plumbing Book 1

 Table 7.22 Key design and installation information: floating floor

Maximum heat output Approx. 70 W/m 2
Recommended design flow temp. 60°C
Maximum circuit length 80 m (15 mm pipe)
100 mm (18 mm pipe)
Maximum coverage per circuit using a 28.5 m 2 @ 300 mm centres (15 mm pipe)
double spreader plate 30 m 2 @ 300 mm centres (18 mm pipe)
Material requirements:
Pipe 3.1 m/m 2 @ 300 mm centres
Single heat spreader plates 3 plate/m 2
Floating floor panel 1 panel/1.4 m 2

Filling and venting systems

Features to allow for appropriate filling and venting
of systems
Open vented systems: positioning the open vent, cold feed and
feed and expansion cistern

The position of the open vent pipe, the cold feed pipe and the circulating pump
to a fully pumped system is an important part of the system design. If the open
vent pipe, the feed pipe and circulating pump are positioned onto the system
incorrectly, the system will not work properly and may even induce system
corrosion due to constant aeration of the system water.

150mm

The neutral point

p Figure 7.73 The position of the cold feed and open vent pipes

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