HAMWORTHY HEATING LTD
5
WESSEX 100 M
500001080/F
3.0
GENERAL REQUIREMENTS
3.1 Related Documents.
Gas Safety Installations and Use Regulations
1994- (As amended).
It is law that all gas
appliances are installed by competent persons, in
accordance with the above regulations. Failure to
install appliances correctly could lead to
prosecution. It is in your own interest, and that of
safety, to ensure that this law is complied with.
The installation of the boiler
MUST
be in accordance
with the relevant requirements of the Gas Safety
Regulations, Building Regulations, IEE Regulations
and the bylaws of the local water undertaking.
The installation should also be in accordance with
any relevant requirements of the local gas region
and local authority and the relevant
recommendations of the following documents :-
British Standards
BS 7074:
Application, selection and installation of
expansion vessels and ancillary equipment for
sealed water systems.
Part 2:
Code of practice for low and medium
temperature hot water systems.
BS 6644:
Installation of Gas Fired Hot Water
Boilers - 60 kW to 2MW.
BS 6700:
Design, installation, testing and
maintenance of services supplying water for
domestic use.
BS 6880: Part 1, 2 & 3:
Code of practice for low
temperature hot water heating systems of output
greater than 45 kW.
BS EN 60335, Part 1. Safety of Household & similar
electrical appliances. BS 3456, Part 201: Electrical
Standards.
CP 342:
Centralised hot water supply. Part 2:
Buildings other than individual dwellings.
I. Gas E. Publications
IGE/UP/1
Soundness testing and purging of
industrial and commercial gas installations.
IGE/UP/1A
Soundness testing and direct purging of
small low pressure industrial and commercial natural
gas installations.
IGE/UP/2
Gas installation pipework, boosters and
compressors in industrial and commercial premises.
IGE/UP/10
Installation of gas appliances in industrial
and commercial premises. Pt. 1 flued appliances.
Health and Safety Executive: -
Guidance note PM5
- Automatically controlled
steam and hot water boilers.
CIBSE Publications: -
"CIBSE Guide"
It is impractical in this document to specify all
relevant information, but the following extracts from
the above references are emphasized since failure
to comply with these requirements will almost
certainly result in an unsatisfactory installation.
3.2
Feed water Quality
If the boiler feed water has a high degree of
hardness, it is recommended that the water be
treated to prevent precipitation of scale or sludge in
the boiler water passageways. Details of additives
can be obtained from any reliable manufacturer of
water treatment products or the local water
authority.
It should be noted however, that even if the boiler
water is of average hardness, not requiring
treatment, subsequent draining of the system for
repair or constant make-up water due to an
undetected leak will cause additional deposits and
gradual build-up of scale. It is essential, therefore
that leaks are attended to promptly and draining is
kept to an absolute minimum.
It is recommended that the system is flushed out at
least twice with hot water before any treatment is
added. If any doubt exists regarding the internal
cleanliness of an old system, consideration should
be given to the fitting of a coarse filter in the return
pipework to the boilers.
3.3
Adequate Water Flow
The Hamworthy Wessex boiler is designed as a
quick response, low water content unit, to run
continuously with maximum reliability. Care should
be taken in the initial design and layout having due
regard for adequate water flow through the boilers
and the influence of the system controls.
The Wessex boiler is a high efficiency appliance
tested with flow/return temperatures of 80°C/65°C. It
is recommended that the system design should
ensure a minimum return temperature of 50°C.
If the temperature / flow rates of the application
cannot meet those given in Figure 2.2 (p4). it may
be necessary to incorporate mixing valves and
shunt pumps to ensure that the boiler will operate
satisfactorily.
Figure 2.2 (p4) shows recommended and minimum
water flows required with the associated pressure
Содержание Wessex 100 M100
Страница 39: ...Notes ...
