HAMWORTHY HEATING LTD. PUREWELL PERMANENT IGNITION 500001090/B
1
1.0 INTRODUCTION
1.1 A competent person holding ‘CORGI’ registration
or equivalent must install this boiler. All installations
MUST conform to the relevant Gas Safety and
Building Regulations. Health & Safety requirements
must also be taken into account when installing any
equipment. Failure to comply with the above may lead
to Prosecution.
1.2 These instructions are for Group H Natural Gas
(2nd Family) and LPG-Propane (3rd Family). The
information relative to propane firing is to be found in
Appendix ‘A’. Boilers MUST NOT use gas other than
that for which they were designed and made for.
1.3 The Purewell is an Atmospheric, Gas Fired boiler
manufactured from horizontal cast iron sections,
nippled at alternate ends. These sections are
mounted on a fabricated mild steel basket assembly,
which houses the burner bar and igniter assemblies.
A unique radiant baffle is fitted beneath the burner
bars, protecting the floor below by reducing heat lost
from the boiler.
The ‘Classic’ version of the Purewell boiler is
designed to be connected to the flue via a specifically
designed draught diverter. The draught diverter
MUST be fitted into the spigot on top of the heat
exchanger as supplied. NO modification or variance is
permitted as this may change operational
characteristics.
An optional On/Off Primary Flue Damper kit is
available for ‘Classic’ models only. This damper
MUST be fitted into the spigot on top of the heat
exchanger as supplied. NO modification or variance is
permitted as this may change operational
characteristics. Flue outlets from more than one boiler
may be connected together to form a header.
‘Integra’ versions have an in-built draught diverter and
can therefore be connected direct to a header
assembly via a suitable flue pipe.
1.4 The Purewell boiler is available with an optional
Flame Failure kit, allowing a signal to be generated
should the pilot drop out. NOTE! There is no facility to
electrically interface any input/output with the boiler
controls. Refer to Section 9.0 ELECTRICAL SUPPLY
for details.
1.5 If the boiler is to be connected to an un-vented
(pressurised) heating system, care must be taken to
ensure all extra safety requirements are met and that
the relevant interlocks will shut down the boiler(s)
should a high or low pressure fault occur.
The Pressurisation unit must also incorporate a low
level water switch, which protects the water pumps,
and will directly or indirectly shut down the boiler plant
should a low water condition occur.
Consideration should also be given to the maximum
working pressure of the boiler as given in Section
2:TECHNICAL DATA. Consult Hamworthy Heating
Technical Department for help or assistance if in
doubt.
1.6 The Purewell boiler is not suitable for direct
connection to domestic hot water supplies or gravity
fed heating systems.
1.7 The Purewell boiler can be installed with either
reverse return water flow layout or with single pipe
header layout. See Figure No. 8 for typical schematic
layout.
Hamworthy Heating can supply a pre-designed
arrangement of components, which will produce a
"reverse-return" assembly. Please contact
Hamworthy Heating for information.
1.8 It is good practice in all heating installations to use
some form of water treatment to reduce formation of
lime scale and black iron oxide sludge. The high
efficiencies produced by the Purewell Boiler can easily
be reduced by lime scale formation. If a Pressurised
unit is used, it is prudent to include an hours run meter
to give an indication of pump running time and hence
raw water make up. Any leaks should be attended to
as soon as possible to avoid calcium salt build up
within the boiler's waterways.
2.0 TECHNICAL DATA
2.1 Overall dimensions are shown in Figure No. 9.
Both single and multi boiler arrangements are shown.
The Purewell boiler can be installed as a single unit or
in modular form where a 'multi' casing reduces
required floor area. Each boiler has an independent
door for access to the controls and other working
components.
It is recommended that a maximum of 6 boilers can be
positioned on 533mm (21") centres if required. Larger
numbers should be split into two or more banks with
150mm (6") between each bank. NOTE! When
installing modular units on 533mm (21") centres, the
casing support rail or spacing plates should be fitted
between each boiler before bolting together. See
Section 10.1:General Installation of Boilers Ref.: -
spacing plates for further information.
2.2 General Information and Technical Data relating to
Natural Gas is shown in Figure No. 1. Technical data
relating to propane firing can be found in Appendix ‘A’.
2.3 Screw threads: All screw threads used in the
Purewell boiler conform to the following: -
ISO 7/1 or ISO 228/1 for pipe threads where
applicable.
ISO 262 for all general screw threads.
