HAMWORTHY HEATING LTD. PUREWELL AUTOMATIC IGNITION 500001035/G
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
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 standard version of the Purewell boiler is designed
to be connected to the flue via a specifically designed
draught diverter. This 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. Flue outlets from
more than one boiler may be connected together to
form a header.
Low Line versions have an in-built draught diverter
and can therefore be connected direct to a header
assembly via a suitable flue pipe.
1.4
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.
1.5
The Purewell boiler is not suitable for direct
connection to domestic hot water supplies or gravity
fed heating systems.
1.6
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.
1.7
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.
