Glow-worm Xtramax - Manual (Page 10)

10 4000116705-2
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.
1.1 Sheet Metal Parts
WARNING: When installing the appliance, care should be
taken to avoid any possibility of personal injury when handling
sheet metal parts.
1.2 Statutory Requirements
The installation of the boiler MUST be carried out by a competent
person in accordance with the relevant requirements of the
current issue of:
Manufacturer’s instructions, supplied.
The Gas Safety (Installation and Use) Regulations, The Building
Regulations, The Building Standards (Scotland) Regulations
(applicable in Scotland), local Water Company Bylaws, The
Health and Safety at Work Act, Control of Substances Hazardous
to Health, The Electricity at Work Regulations and any applicable
local regulations.
Detailed recommendations are contained in the current issue of
the following British Standards and Codes of Practice, BS4814,
BS5440 Part 1 and 2, BS5449, BS5546, BS6700, BS6798,
BS6891 and BS7074 Part 1 and 2, BS7478, BS7593, BS7671.
Manufacturer’s notes must not be taken as overriding statutory
obligations.
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 H
epworth 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.
1.3 Gas Supply
The gas installation must be in accordance with the current
issue of BS6891.
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.
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.
• The XTRAMAX is for use ONLY with sealed central heating
systems.
• Heating surfaces may consist of radiators, convectors or fan
assisted convectors.
• The appliance can be piped directly to an underfloor heating
system without the need for a mixing bottle. The maximum
central heating flow temperature can be set to 53°C on the boiler
printed circuit board during commissioning.
0
10
20
30
40
50
60
1200 1000 800 600 400 200 0
1
2
3
4
5
Pom 010 a
Flow rate through heating system (I/h)
(10 kPa = 1 m WG)
1
2
3
4
5
Bypass fully shut
Open 1/4 turn
Open 1/2 turn
Open 1 turn
Open 2 turns Available pressure (kPa) between
heating supply and return lines
Diagram 3.1
3 Heating System Design
• 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 400 l/h.