HAMWORTHY HEATING LTD
1
MILBORNE
500001130/J
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
firing information 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 Milborne is a gas fired, fully modulating, pre-
mix, condensing, room sealed central heating / hot
water boiler, comprising of 1 or 2 - 37.5 or 50kW
modules within a single casing.
Where the application requires more than 75 or 100kW,
the boiler can be supplied in a modular format, with a
maximum of six modules sharing a common flue and
water pipework - optional HHL supply. See figures 2.3 -
2.6 for typical schematic layout.
1.3.1
Using the latest gas / air ratio control technology
it is able to provide clean efficient operation across a
large output range via a built in controls package ideally
suited to installations that do not have a dedicated
controls installation.
The integrated controls provide cascade management
for multiple boilers and simultaneous management of
three different circuits operating at different
temperatures. (radiators, dhw & under-floor heating)
1.3.2
Each of the boiler models is designed for direct
connection to a plastic flue system - HHL supply. The
Technical Data for the various arrangements is given in
section 5.2
.
The flue outlets from more than one unit may be
connected to a single chimney.
Individual modules can be room sealed using 50mm
plastic flue pipe (HHL supply) up to a maximum length
of 30 metres.
No draught diverter is fitted to the boiler nor is a fixed
diverter required in the flue system.
1.3.3
The Milborne is intended for the heating of
Commercial and Industrial premises, or large residential
properties. It may also be used to supply hot water for
these premises via an indirect cylinder.
1.3.4
The Milborne has a low water content and water
flow rates
MUST
be maintained at or above the
recommended levels shown in Appendix ’E’.
It is recommended by Hamworthy Heating, that the
primary pump MUST be controlled from the Master
boiler
to ensure synchronised operation - refer to fig.
4.6.
1.4
The boiler is only suitable for connection 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.
1.5
The Milborne boiler is not suitable for direct connection
to domestic hot water supplies.
1.6 BOILER VARIATIONS
Milborne 381 -
single 37.5kW c/w Master control
Milborne 382M
- two 37.5kW modules c/w Master control
Milborne 382S
- two 37.5kW modules c/w Slave control
Milborne 501 -
single 50kW c/w Master control
Milborne 502M
- two 50kW modules c/w Master control
Milborne 502S
- two 50kW modules c/w Slave control
Note -
when installing multiple boilers, one of the boilers
must have Master control.
1.7
Each Milborne boiler is supplied with a vfc contact
output for a General Fault and 0~10v analogue control
input compatibility.
1.8
Options -
refer to individual kit instructions for details
1.8.1
Optional frame set and water pipework kits are
available for up to 4 boilers. These kits are free-standing
allowing installation to the system prior to installing the
boiler and incorporate all necessary valves, inter
connecting pipework, and flow and return headers. Refer
to individual kit instructions for details.
1.8.2
Optional Primary Circuit kit - In addition to the frame
and pipework kit, the primary circuit kit includes a matched
pump, low loss header and associated fittings to complete
a packaged primary circuit.
It is recommended by Hamworthy Heating, that the
primary pump MUST be controlled from the Master
boiler
to ensure synchronised operationoperation - refer
to fig. 4.6.
1.8.3
Optional low temperature heating circuit sensor,
used to provide temperature information to the Master
control for modulation of a 3-port valve and pump (HHL
supply part no. 573407126)
1.8.4
Optional Programmable room thermostat used to
provide air temperature and timed control. (HHL supply
part no. 573407127)
1.8.5
Optional DHW sensor used to control a DHW
cylinder (HHL supply part no. 573407126)