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eLibrary > 23/30445277 DC BS 8635-1. Hydraulic interface units for heat network applications - Part 1. Specification >

23/30445277 DC BS 8635-1. Hydraulic interface units for heat network applications - Part 1. Specification, 2023

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23/30445277 DC BS 8635-1. Hydraulic interface units for heat network applications - Part 1. Specification, 2023

30445277 form 36
30445277 [Go to Page]
1 Scope
2 Normative references
3 Terms, definitions and abbreviations [Go to Page]
3.1 Terms and definitions [Go to Page]
3.1.1 differential pressure
3.1.2 Filter and strainer [Go to Page]
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 [Go to Page]
3.1.7.1 primary
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
4 Design [Go to Page]
4.1 General [Go to Page]
4.1.1 General
4.1.2 Use and servicing [Go to Page]
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
4.1.4 Draining and venting
4.2 HIU design for operation: Pressure [Go to Page]
4.2.1 General pressure conditions
4.2.2 Pressure test points
4.2.3 Differential pressure
4.2.4 Water expansion [Go to Page]
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
4.2.4.4 DHW protection against excess pressure with DHW recirculation
4.3 HIU design for operation – Temperature [Go to Page]
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
4.3.7 Control of decentralized thermal storage
4.3.8 Temperature control of storage medium
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
5.2 Materials [Go to Page]
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 [Go to Page]
5.2.5.1 General
5.2.5.2 Insulation of cooling interface units (CIUs) [Go to Page]
6 Manufacture: End of line testing
7 Connections to a tertiary system
8 Safety [Go to Page]
8.1 Fire
8.2 Scalding
8.3 Pressure explosion
8.4 Electrocution
8.5 Burns
8.6 Sharp edges
8.7 Lifting
8.8 Remote-control device
9 Electrical and electromagnetic safety [Go to Page]
9.1 General
9.2 Operational safety in the event of failure of the auxiliary energy
10 Packaging
11 Documentation (marking and instructions) [Go to Page]
11.1 Data plate: Identification
11.2 Warnings on the HIU and the packaging [Go to Page]
11.2.1 General
11.2.2 Heat meter
11.3 Instructions [Go to Page]
11.3.1 Installation instructions
11.3.2 User instructions
11.4 Presentation
Annex A (informative) Example of a risk assessment method and realization of protective measures [Go to Page]
A.1 Introduction
A.2 Risk identification
A.3 Identification of the sources and sub sources of the basic risk [Go to Page]
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 [Go to Page]
The condition of the source can be normal or abnormal.
A.5 Identification of the classification of the necessary protective measure [Go to Page]
The classification of the necessary protective measure is identified, making use of the described safety philosophy.
A.6 Overall classification of a basic risk
A.7 Example risk assessment
A.8 Protective measures
Annex B (informative) Classification of HIU types
Annex C (informative) Declaration of conformity
Annex D (informative) Example calculation of expansion volume [Go to Page]

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