HAMWORTHY HEATING LTD
19
MILBORNE
500001130/J
Water Systems
Connecting pipework must be self-supporting to avoid stress on the boiler connections. Local unions are
recommended in the pipework to facilitate future servicing requirements.
Each module is fitted with safety valve rated at 6bar. The valve discharge pipe is routed to the base of the boiler,
where it must be piped to discharge via a tundish (not HHL supply) suitably located for ease of visibility.
It is strongly recommended that the boiler is fitted to a primary circuit configuration, whereby the primary pump
ensures correct flow through all boilers at all times. The Milborne is designed to operate at 20°C
∆
T across the
flow and return. Should the flow rate drop, the boiler controls will modulate the burner to maintain 20°C
∆
T. As a
safety precaution, a differential pressure switch is fitted to the boiler heat exchanger to shut the system down in
the event of sudden adverse flow conditions.
Where using Hamworthy Heating Ltd frame set and pipework kits, assembly of these is detailed in Operation and
Maintenance manual 500001156
supplied with kit.
5.3 Water Connections
The following connections are provided on each boiler module;
Flow G2½” Male thread.
Return G1
” Male thread.
Condense 18mm dia.
Plastic tail
Flow G1
” Male thread.
Safety valve - 22mm
copper tail.
●
Milborne 381 / 501
501
Pump specification 70kPa @1980l/hr
Flat curve performance, or equivalent to
HHL selected Biral pump - see figure E 1.6
●
381
Pump specification 30kPa @1500l/hr
Flat curve performance, or equivalent to
HHL selected Biral pump - see figure E 1.6
Figure 5.3.2 - Pump performance curve
Figure 5.3.1 - Water Connections - view on base
