Fig 6
Recommended indirect cylinder 135 - 180 litres, depending on domestic requirements with a 2.5 cm (1”)
flow and return pipes not exceeding 7.8m(25’ 6”) each in length. Cylinder and pipework should be lagged to
minimise heat losses.
Diagrams illustrate the basic principles of water systems and are not to be regarded as working drawings.
NOTE: We strongly advise the
use of pipe lagging and also the
use of a frost thermostat of the
installation is likely to be
exposed to situations where the
temperatures will drop to a level
consistent with frost.
HEATING SYSTEM
The system must include a gravity circuit with
expansion pipe, open to the atmosphere. The
central heating will normally be pump-driven as
with other types of boilers. The primary air valve
behind the fire door controls heating rate of the boil-
er, closed = minimum, open = maximum output.
See Operating Instructions.
BOILER OUTPUT
High output cannot be maintained unless fuel is
being burned at a rate of 2.7 Kg. per hour of coal.
When burning wood reduced outputs will apply
because of the lower calorific value of the fuels.
GRAVITY CIRCUIT
The gravity circuit consists of the domestic hot
water tank of 135-180 litres Indirect Cylinder for
Central Heating Unit and 135 litre Direct Cylinder
for Domestic Hot Water Unit fixed in an upright
position, recommended for hot water storage and it
should be connected to the boiler by 25mm (1”)
diameter flow and return piping. The pipes should
not exceed 7.8m (25’ 6”) each in length and any-
thing in excess of 4.6m (15’) must be fully lagged.
The shorter the run of pipe work the more effective
the water heating efficiency and to this end, the
cylinder should be fully lagged. The use of valves
on the circuit is not recommended.
HEATING
Care should be taken to ensure that the heating
installation is correctly installed and that it complies
with all relevant codes of practice. If this appliance
is being connected to an existing system, it is
strongly recommended to check the following:
(a) The system is sound
(b) That the pipework is adequately insulated
(where applicable).
(c) Check all controls e.g. pump, radiator valves
etc, are operating satisfactorily and are com-
patible with the requirements of the cooker.
(d) Are any modifications necessary to make
the heating system more efficient?
(e) Cleanse the system and add suitable inhibitor.
Only competent personnel should be employed to
carry out your heating installation.
PIPE FITTINGS
Materials used for installation work should be fire
resistant, sound and should conform to the current
editions of the following or their equivalent:
1. Ferrous Materials
B.S. 1387: Steel tubes
B.S. 1740: Steel pipe fittings
B.S. 5295 & jointing materials
7
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