Glow-worm 30ci Plus - Manual (Page 11)

11 4000123944-2
3 Heating System Design
• The 30ci plus is for use with sealed central heating systems.
• Heating surfaces may consist of radiators, convectors or fan
assisted convectors.
• The safety valves are an integral part of the boiler and cannot
be adjusted.
• The circulation pump is integral with the boiler.
• Pipe sectional areas shall be determined in accordance with
normal practices, using the output/pressure curve
(diagram 3.1). The distribution system shall be calculated in
accordance with the output requirements of the actual system,
not the maximum output of the boiler. However, provision shall
be made to ensure sufficient flow so that the temperature
difference between the flow and return pipes be less than or
equal to 20
°
C. The minimum flow is shown in Table 1.
The system can be fitted with a lockable balancing valve if
necessary in the main flow or return pipes shown as valve 'A'
in diagram 3.2.
• The piping system shall be routed so as to avoid any air
pockets and facilitate permanent venting of the installation.
Bleed fittings must be provided at every high point of the
system and on all radiators.
• The total volume of water permitted for the heating system
depends, amongst other things, on the static head in the cold
condition. The expansion vessel on the boiler is pressurised at
0.5 bar and allows a maximum system volume of 156 litres for
an average temperature of 75
°
C and a maximum service
pressure of 3 bar. This pressure setting can be modified at
commissioning stage if the static head differs. An additional
expansion vessel can be fitted to the system if required, see
diagram 3.2.
• Provision shall be made for a drain valve at the lowest point of
the system.
• Where thermostatic radiator valves are fitted, not all radiators
must be fitted with this type of valve, and in particular, where
a room thermostat is installed.
• In the case of an existing installation, it is ESSENTIAL that the
system is thoroughly flushed prior to installing the new boiler,
Using a proprietary product such as Fernox or Sentinel. Contact
the product manufacturers for specific details.
2 General Information
IMPORTANT NOTICE.
Where no British Standards exists, materials and equipment
should be fit for their purpose and of suitable quality and
workmanship.
Refer to Manual Handling Operations, 1992 regulations.
The installation of this boiler must be carried out by a competent
person in accordance with the rules in force in the countries of
destination.
Manufacturer’s instructions must not be taken as overriding
statutory requirements.
2.1 Sheet Metal Parts
WARNING: When installing the appliance, care should be
taken to avoid any possibility of personal injury when handling
sheet metal parts.
2.2 Statutory Requirements
The appliance is suitable only for installation in GB and IE and
should be installed in accordance with the rules in force.
In GB the installation of the boiler MUST be carried out by a
competent person as discribed in the following regulations:
Manufacturer’s instructions, supplied.
The Gas Safety (Installation and Use) Regulations.
The appropriate Building Regulations, either The Building
Regulations, The Building Regulations (Scotland), The building
Regulations (Nothern Ireland).
The Water Fittings Regulations or Water Bylaws in Scotland.
The Health and Safety at Work Act, Control of Substances
Hazardous to Health (COSHH).
The Current I.E.E. Wiring Regulations.
Where no specific instructions are given, reference should be
made to the relevant British Standard Code of Practice.
In I.E the installation must be carried out by a competent person
and installed in accordance with the current edition of I.S. 813
"Domestic Gas Installations", the current Building Regulations
and reference should be made to the current ETCI rules for
electrical installation.
In GB the following Codes of Practice apply:
BS4814, BS5440 Part 1 and 2, BS5449, BS5546 Part 1, BS6700,
BS6798, BS6891 and BS7074 Part 1 and 2, BS7478, BS7593,
BS7671.
In IE: I.S.813, BS5546, BS5449, BS7074, BS7593.
Manufacturer’s notes must not be taken as overriding statutory
requirements.
BSI Certification
This boiler certificated to the current issue of EN 483 for
performance and safety.
It is important that no alteration is made to the boiler, without
permission, in writing, from Hepworth Heating Ltd.
Any alteration that is not approved by Hepworth Heating Ltd.,
could invalidate the warranty and could also infringe the current
issue of the Statutory Requirements.
2.3 Gas Supply
The gas installation must be in accordance with the relevant
standards.
In GB this is BS 6891.
In IE this is the current edition of I.S.813 "Domestic gas
installation".
The supply from the governed meter must be of adequate size
to provide a steady inlet working pressure of 20mbar (8in wg) at
the boiler.
Important Notice
If your boiler has been converted to use L.P.G. Propane the
following note applies:
Propane cylinders are under pressure and should never be
stored or used indoors residentially.
They should only be kept outside.
Under no circumstances should L.P.G. Propane cylinders be
fitted or stored in basement areas or boiler houses.
On completion, test the gas installation for soundness using the
pressure drop method and suitable leak detection fluid, purge in
accordance with the above standard.