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BSI 23/30445277 DC 2023

BSI 23/30445277 DC 2023

$13.70

BS 8635-1. Hydraulic interface units for heat network applications – Part 1. Specification

Published By Publication Date Number of Pages
BSI 2023 43
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PDF Catalog

PDF Pages PDF Title
1 30445277 form 36
3 30445277
6 1 Scope
2 Normative references
7 3 Terms, definitions and abbreviations
3.1 Terms and definitions
3.1.1 differential pressure
3.1.2 Filter and strainer
3.1.2.1 filter
3.1.2.2 strainer
3.1.3 HIU
3.1.4 heat network supply
3.1.5 keep-warm
3.1.6 manufacturer
3.1.7 Pipework
3.1.7.1 primary
8 3.1.7.2 secondary
3.1.7.3 tertiary
3.1.8 pressure relief valve
3.1.9 return temperature limiter
3.1.10 static pressure
3.1.11 substation
3.1.12 terminal device
3.2 Abbreviations
9 4 Design
4.1 General
4.1.1 General
4.1.2 Use and servicing
4.1.2.1 Use
4.1.2.2 Servicing
4.1.2.3 Isolation
If a flushing bypass is supplied with the HIU, it shall be possible to unambiguously identify the bypass state (open/closed) with a simple visual check. The bypass valve shall only be opened by means of a tool.
4.1.3 Water connections
10 4.1.4 Draining and venting
4.2 HIU design for operation: Pressure
4.2.1 General pressure conditions
4.2.2 Pressure test points
4.2.3 Differential pressure
4.2.4 Water expansion
4.2.4.1 Tertiary heating expansion vessel
4.2.4.2 Tertiary heating safety relief valve
4.2.4.3 DHW circuit: protection against excess pressure
11 4.2.4.4 DHW protection against excess pressure with DHW recirculation
12 4.3 HIU design for operation – Temperature
4.3.1 Ambient temperature conditions
4.3.2 Temperature control
4.3.3 Temperature control
4.3.4 Tertiary heating control
4.3.6 DHW recirculation
13 4.3.7 Control of decentralized thermal storage
4.3.8 Temperature control of storage medium
14 4.3.9 Temperature and time control for stored DHW systems
4.3.10 Keep-warm
4.4 Heating and cooling meters installed in the HIU
4.5 Protection of externally installed HIUs
5 Construction and materials
5.1 General
15 5.2 Materials
5.2.1 General
5.2.2 Materials use restrictions
5.2.3 Materials specification
5.2.4 Domestic water connections
5.2.5 Thermal insulation
5.2.5.1 General
5.2.5.2 Insulation of cooling interface units (CIUs)
16 6 Manufacture: End of line testing
7 Connections to a tertiary system
8 Safety
8.1 Fire
8.2 Scalding
17 8.3 Pressure explosion
8.4 Electrocution
8.5 Burns
8.6 Sharp edges
8.7 Lifting
8.8 Remote-control device
18 9 Electrical and electromagnetic safety
9.1 General
9.2 Operational safety in the event of failure of the auxiliary energy
10 Packaging
11 Documentation (marking and instructions)
11.1 Data plate: Identification
19 11.2 Warnings on the HIU and the packaging
11.2.1 General
11.2.2 Heat meter
11.3 Instructions
11.3.1 Installation instructions
21 11.3.2 User instructions
11.4 Presentation
22 Annex A (informative) Example of a risk assessment method and realization of protective measures
A.1 Introduction
A.2 Risk identification
A.3 Identification of the sources and sub sources of the basic risk
Basic risks can have various sources, each of their own and individual origin. Furthermore, each of these sources can have various sub sources.
A.4 Identification of the condition of the source or sub-source
The condition of the source can be normal or abnormal.
23 A.5 Identification of the classification of the necessary protective measure
The classification of the necessary protective measure is identified, making use of the described safety philosophy.
A.6 Overall classification of a basic risk
25 A.7 Example risk assessment
26 A.8 Protective measures
27 Annex B (informative) Classification of HIU types
39 Annex C (informative) Declaration of conformity
40 Annex D (informative) Example calculation of expansion volume

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BSI 23/30445277 DC 2023
$13.70