Hamworthy Wessex 100 M100, Installation, Commissioning And Servicing Instructions

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HAMWORTHY HEATING LTD
1
WESSEX 100 M 500001080/F
1.0 INTRODUCTION
1.1
This boiler must be installed by a competent
person holding ' CORGI ' registration or equivalent. 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 This boiler is intended for use on Group H Natural
Gas (2nd Family) and LPG-Propane (3rd Family). The
information relating to propane firing is to be found in
Appendix ‘A’ (p30). Boilers
MUST NOT use gas other
than that for which they are designed and adjusted.
1.3 The Wessex 100 M is a gas fired, high-low, fan
assisted, open flued central heating/hot water boiler
comprising a burner and water tube bank assembly
(Module). A maximum of three vertically stacked
modules can be arranged into a single unit sharing a
common flue
1.3.1 The burner fitted to each module is of the fan
assisted pre-mix type. Operation is initiated by a full
sequence ignition control that incorporates a Hot
Surface Ignition system and rectification supervision
of the flame at both high and low output.
1.3.2 Each of the boiler variations is designed for
direct connection to a flue system. The Technical
Data for the various arrangements is given in
Section
2. 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
1.3.3 The Wessex 100 M 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.
1.3.4
The Wessex 100 M has a low water content and
water flow rates MUST be maintained at or above the
recommended levels shown in
Section 8 (p9) and
Figure 2.2 (p4).
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 satisfied and
that the relevant interlocks will shut the boiler(s) off
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 (p4). Consult Hamworthy Heating
Technical Department for help or assistance if in
doubt.
1.5 The Wessex 100 M boiler is not suitable for
direct connection to domestic hot water supplies or
gravity fed heating systems.
1.6 The Wessex 100 M boiler can be installed with
either reverse return water flow, (optional kits
available) or with single pipe headers, (not HHL
supply)
. See Figure 1.1 (p2) for typical schematic
layout.
BOILER VARIATIONS
Wessex 100 M100
- Single 100kW unit.
Wessex 100 M200 - Single 200kW unit created by
stacking 2 - 100kW modules vertically.
Wessex 100 M300 - Single 300kW unit created by
stacking 3 - 100kW modules vertically.
1.7 The fully assembled unit is supplied covered
with a protective sleeve. The flue assemblies for the
M200 and M300 models are supplied in a separate
pack.
1.8 Options
1.8.1
The Wessex 100 M has an optional kit for
remote indication of the following volt free contact
signals:
a) Normal Run
b) Overheat
c) Lockout
1.8.2 The Wessex 100 M has an optional kit for the
indication of hours run at both high and total firing.
Refer to individual kit instructions for details.
1.8.3
Milton boiler sequence control system for timed
remote control of single and multiple on/off and high/low
boilers, with outside temperature compensation and
optimum start.
Note: Optional Hamworthy Heating Ltd Sequencing
Interface Modules will be required, to be installed within
the control panel of each boiler, to enable sequence
control of the boilers by the Milton boiler sequence
control.
Refer to Milton and Sequence Interface Module kit
instructions for details.
1.8.4 Optional reverse return header kits are
available for models M200 and M300 in both single
and double and triple bank configuration. These kits
are free-standing allowing installation to the system
prior to installing the boiler and can incorporate all
necessary valves, inter connecting pipework, and
flexible flow and return connections. Refer to
individual kit instructions for details.
1.8.5 A high temperature option is available where
flow temperatures up to a maximum of 120
o
C are
required - see Section 8.10.1.2 (p10).