HAMWORTHY HEATING LTD
1
SHAFTESBURY HE
500001049/N
1.0 INTRODUCTION
1.1
The Shaftesbury HE boiler range consists of
10 gas or oil fired cast iron sectional boilers with
outputs ranging from 110kW to 400kW. Refer to
Technical Data in Section 16.0 for details on Natural
gas, Appendix A for Propane and Appendix B for Oil
firing.
Shaftesbury HE boilers can be used individually, or
in a multi-boiler configuration, and are suitable for
use on either open-vented or sealed low
temperature hot water heating systems. For hot
water production they can be used in conjunction
with calorifiers or indirect hot water cylinders.
Stacking kits are available for pairs of Shaftesbury
HE boilers and are assembled on site to HHL
instructions 500005091 in combination with this
manual.
Portland and Weymouth pressurisation units are
available from Hamworthy Heating Ltd for sealed
systems.
1.2
Shaftesbury HE sectional boilers are supplied
unassembled ready for on-site assembly.
The heat exchanger consists of:
a.
A
front
section
b.
Plain intermediate sections which can be
adapted to form the 3 types of intermediate
sections.
c.
A rear section
These sections are connected to each other using
guide rings and 'O' ring gaskets and are held
together by short lacing bolts. The complete
assembly is held together by four M14 threaded tie
rods running the length of the heat exchanger.
The section to section flue gas seal is made by:
d.
A mastic strip around the outer perimeter of
each
section.
e.
A mastic strip around the perimeter of the
combustion chamber of each section.
The sections are cast with extended surface fins to
increase the heat exchange area and thus enhance
thermal efficiency in use.
Shaftesbury HE boilers have an operating efficiency
of over 80% based on gross CV.
The heat exchanger assembly is completed by cast
iron front and rear combustion chamber plates and
access plates for the cleaning and inspection of the
heat exchanger flue ways (on front and rear), all of
which are internally lined with a ceramic fibre
insulation board. The smoke box/flue connector is
bolted to the upper part of the rear section and
sealed with a ceramic fibre gasket.
The heat exchanger is mounted on a steel cradle
which in turn stands on legs, leaving access for
cleaning beneath the heat exchanger. The flow and
return water connections are located at the rear of
the boiler. Refer to Section 8 for details.
The Shaftesbury HE boiler can be fitted with either
an on/off, high/low or modulating burner for
operation on Natural Gas I
2H
(Second Family) or
Propane I
3p
(Third Family) or an on/off or high/low
burner for operation on Class D (35 second) fuel oil.
The boiler is supplied with a pre-wired control panel
which contains:
a
. A
fuse
b
.
An illuminated mains on/off switch
c
.
A boiler thermostat
d
.
A boiler run lamp
e
.
A temperature limiter (overheat thermostat) to
shut down the boiler should the water
temperature in the heat exchanger exceed
110
o
C - with manual reset.
f
.
An overheat lamp
g
.
An hours run meter
h
. A water temperature thermometer
(temperature
gauge)
i
.
A flying lead and plug to connect to the burner
j
.
An additional thermostat, boiler run lamp,
hours run meter and flying lead/plug for high/
low
burners
(optional).
k.
A volt free relay kit for normal run, overheat
and lockout can be supplied as an optional
extra.
The boiler is housed in a powder coated sheet steel
casing which is supplied flat-packed for on-site
assembly. Refer to Section 10 for casing assembly
procedure.
1.3
All Shaftesbury HE boiler sections are
hydraulically tested to 10 bar (145 psi), ensuring the
Shaftesbury HE boiler is suitable for use on systems
with maximum working pressures of up to 5 bar (73
psi).
