Hamworthy PUREWELL VariHeat he, Инструкция по установке, пусконаладке и обслуживанию

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HAMWORTHY HEATING LTD
1
PUREWELL VariHeat he 500001155/F
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) only. The information relating to Natural
Gas firing is to be found in Appendix ‘A’. Boilers
MUST
NOT use gas other than that for which they were
designed and made.
1.3 The Purewell Vari Heat he is a fully modulating,
pre-mix, gas fired boiler manufactured from horizontal
cast iron sections.
The boiler is floor mounted and is intended for the
heating of Commercial and Industrial premises. It
may also be used to supply hot water for these
premises via an indirect cylinder.
1.3.1 Each boiler module has a dedicated
microprocessor based boiler management system,
controlling and monitoring all safety and functional
aspects of the boiler performance and it’s integration
with external system controls.
1.3.2
The Purewell Vari Heat he boiler is delivered to
site fully assembled fitted with it’s casing and
controls. Care should be taken when manoeuvring
the boiler into position to avoid damage.
1.3.3
Each of the boiler models is designed for direct
connection to a flue system. The flue outlets from
more than one unit may be connected to a single
chimney. No draught diverter is fitted to the boiler nor
is a fixed diverter required in the flue system.
However a draught stabiliser is recommended for
some installations—see Appendix ‘C’ (Page 43).
1.3.4 The Purewell Vari Heat he has a low water
content and minimum flow rates MUST be maintained
above the recommended levels shown in Appendix
‘E’ (Page 47)
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 Appendix
‘E’. Consult Hamworthy Heating Technical
Department for help or assistance if in doubt.
1.5 The Purewell Vari Heat he boiler is not suitable for
direct connection to domestic hot water supplies or
gravity fed heating systems.
1.6 The Purewell Vari Heat he boiler can be installed
with either reverse return water flow layout or with
single pipe header layout (non HHL supply). See
Appendix E for typical schematic layout.
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
Vari Heat he Boiler can easily be reduced by lime
scale formation. If a pressurisation 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 scale build up within the boiler's
waterways.
1.8
Each Purewell Variheat he module is supplied
with volt free contact outputs for Normal Run,
Overheat and General Fault, and 0~10v analogue
control input compatibility. In addition, the control
system allows the connection of multiple boilers on
an RS485 bus connection to enable Cascade control
of up to 8 multiple boilers by the selection of Master/
Slave configuration.
1.9 Options
1.9.1
Optional reverse return header kits are
available in 2, 3 & 4 boiler configuration covering
models 65he - 85he & 105he - 125he. These kits
incorporate all necessary valves and interconnecting
pipework. Refer to individual kit instructions for
details.
1.9.2 Controls peripherals
1.9.2.1 External Sensor - For single boiler
installations, an external air temperature sensor is
available to allow direct weather compensation on the
boiler.
For multiple boiler installations under Cascade control
from the boiler controls, the same sensor may be
connected to the Master to provide direct
compensation on the Cascade.
1.9.2.2
Cascade Control kit - For multiple boiler
installations under Cascade control, a mixed flow
sensor is supplied to influence the modulation of the
Cascade against the setpoint.