system, in an effort to minimise black oxide,
sludge and scale build-up, which effects efficiency.
In hard water areas the use of a suitable limescale
preventer / remover is advised.
Use only quantities specified by the water treat-
ment product manufacturer. Only add to the heat-
ing system after flushing and finally refilling. Refer
to BS 7953.
DRAINING
Key - operated drain taps to B.S. 2879 should be
provided in accessible positions in all low parts of
the system. However it should be noted that there
may be short sections of pipework e.g. when pass-
ing under doorways that may be possible to drain.
GENERAL MAINTENANCE
It is important that the user is familiar with their
heating system and that they ensure regular
checks and maintenance which can limit unneces-
sary breakdowns.
We recommend that you evaluate the overall insu-
lation in your house, i.e. attic, external walls, win-
dows, external doors. Insulation and draught proof-
ing can greatly reduce running costs, while equally
enhancing living conditions.
DRAUGHT REQUIREMENTS
Remember a proper flue is necessary for the effi-
cient operation of your solid fuel Cooker to provide
a steady Draught of
0.06 INS. to 0.10 INS. W.G.
1.52 MM to 2.54 MM W.G.
0.15 M BARS to 2.5 M.BARS
Where a draught recorded is over 0.10 ins. :
2.54cm W.G. a draught stabiliser should be fitted.
2. Non-ferrous materials
I.S. 238: Copper tubes
B.S. 4127: Stainless steel tubes
EN 29453:Solder
I.S. 239: Compression tube fittings
B.S. 1552: Manual shut-off valves
FUELS
The cooker output levels are assessed on standard
House Coal of good quality. Reduced outputs will
result when fuels of low calorific values are used.
Wood logs up to 35cm (13”) long are suitable. All
fuel should be stored under cover and kept as dry
as possible prior to use.
WATER CIRCUIT TEMPERATURE
The return water temperature must be maintained
at not less than 50°C so as to avoid condensation
on the boiler and return piping. Fitting a pipe ther-
mostat to the return from the gravity circuit and
wiring it into the pump control will ensure that no
cold water will be returned from the central heat-
ing circuit before the water from the gravity circuit
has warmed up the common return pipe and boil-
er. If this is not sufficient to keep the boiler tem-
peratures above the required minimum, a three-
way mixing valve may be fitted to the flow pipe to
divert some hot water straight back into the return.
Such a valve can be operated either manually or
electrically in conjunction with a return pipe ther-
mostat. See Fig.7
INJECTOR TEE (Central Heating)
Where the gravity and central heating circuits join
together to return to the Cooker we recommend the
use of an injector tee connection, situated as close
to the unit as possible. This type of tee encourages
a stable flow of hot water through both circuits and
helps to prevent priority being given to the stronger
flow, which is most commonly the pumped central
cheating circuit, this way there will be no shortage
of hot water to the taps when the heating is on.
CARE FOR YOUR CENTRAL HEATING
SYSTEM
We strongly recommend the use of suitable corro-
sion inhibitors and anti-freeze solution in your heat-
ing.
Fig.7
Fig.8
8
Drain Off Cock
Pipe Thermostat
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