Introduction; Boiler Variations; Options; Controls Peripherals - Hamworthy Wessex Modumax 100 series Installation, Comissioning And Servicing Instructions

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) 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 are designed
and adjusted.
1.3 The Wessex ModuMax is a gas fired, fully
modulating, condensing or high efficiency, fan assisted,
open flued or room sealed central heating / hot water
boiler. Using the latest gas / air ratio control technology it
is able to provide clean efficient operation across a large
output range. The boiler can be supplied in a modular
format, a maximum of three vertically stacked modules
being arranged into a single unit sharing a common flue.
1.3.1 Each boiler module utilises a metal fibre, fan
assisted, pre-mix burner. Operation is initiated and
controlled by a LMU boiler management system with a
user interface lcd screen for accessing and changing
boiler parameters.
1.3.2 Each of the boiler models is designed for direct
connection to a flue system. The Technical Data for the
various arrangements is given in Appendix 'C'. 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 ModuMax is floor mounted and is
intended for the heating of Commercial and Industriall
premises. It may also be used to supply hot water for
these premises via an indirect cylinder.
1.3.4 The Wessex ModuMax has a low water content
and water flow rates MUST be maintained at or above
the recommended levels shown in Appendix 'E'.
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 Appendix 'E'. Consult Hamworthy Heating
Technical Department for help or assistance if in doubt.
HAMWORTHY HEATING LTD
1.5 The Wessex ModuMax boiler is not suitable for direct
connection to domestic hot water supplies.
1.6 The Wessex ModuMax boiler can be installed with
either reverse return water flow, (optional kits available)
or with single pipe headers, (non HHL supply). See
Appendix 'E', figure E1.1.1 for typical schematic layout.

BOILER VARIATIONS

Wessex ModuMax 110/110 - Single 110 kW unit.
Wessex ModuMax 110/220 - Single 220 kW unit
created by stacking 2 – 110 kW modules vertically.
Wessex ModuMax 110/330 - Single 330 kW unit
created by stacking 3 – 110 kW modules vertically.
Wessex ModuMax 120/120c - Single 120 kW unit.
Wessex ModuMax 120/240c - Single 240 kW unit
created by stacking 2 – 120 kW modules vertically.
Wessex ModuMax 120/360c - Single 360 kW unit
created by stacking 3 – 120 kW modules vertically.
1.7 The fully assembled unit is supplied covered with a
protective sleeve. The flue assemblies for the 110/220,
110/330, 120/240c and 120/360c models are supplied in
a separate pack.
1.8 Each Wessex ModuMax module is supplied with vfc
contact outputs for Normal Run and General Fault
outputs, and 0~10v analogue control input compatibility.

1.9 Options

1.9.1 Optional reverse return header kits are available for
models 110/220, 110/330, 120/240c and 120/360c.
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.

1.9.2 Controls peripherals

The LMU boiler management system has the potential to
accept the following control options:
1.9.2.1
compensation on an individual boiler. Not to be used for
multiple boiler systems.
1.9.2.2 Clip in module (LPB Bus) - allows communication
with multiple boilers under the control of an RVA47
cascade control.
1.9.2.3 RVA47 cascade control - allows cascade
management of up to 12 boilers, and interface with a
BMS system.
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WESSEX MODUMAX 100 SERIES
External sensor—allows direct weather
500001123/C