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12
HEARTH AND FIRE SURROUND
The appliance must be installed on a fireproof hearth and must
be situated at least 300 mm (12 inches) from any combustible
material. The positioning of the appliance and the size of the
hearth are governed by building regulations for Class 1
appliances. These building regulations state that the hearth
must extend in front of the appliance by at least 300 mm (12
inches) and to the sides by at least 150 mm (6 inches). If in
doubt as to the positioning of the appliance expert advice
should be sought either from the supplier or the local building
inspector.
The fire surround area shown in Fig. 7 must be of non -
combustible material such as tile or brick. If marble is used it
must be slabbed on concrete. Resin based conglomerate
marble is NOT suitable: the resin may not stand the
temperature.
PREPARATION OF FIREPLACE
Before fitting the appliance into an existing fireplace remove
the fireback and any loose in-fill material.
The hearth, surround and opening for the appliance must
conform with Figs. 6 and 7. The flat area around the opening
must be a minimum of 750mm wide and 660mm high. Ensure
that the hearth and the base in the opening are flat, level, and
at right angles to the surround.
Make two holes in the chimney breast, one in the front to give
access for infilling and fixing the flue pipe, and one in the side
to give access for the pipework.
CENTRAL HEATING SYSTEM
The central heating system must comply with BSEN
12828:2003, BSEN 12831:2003, and BSEN 14336:2004. If
the system is to be a combined heating and domestic hot
water system then a double feed indirect hot water storage
cylinder to BS:1566-1:2002 should be used. In order to
prevent the build up of scale and corrosion a suitable inhibitor
should be used. The system must be correctly vented as
shown in Figs. 8 and 9. The height differential between the
header tank and the appliance must not exceed 15.2 metres
(50 feet).
If all four boiler tappings are used then, if possible, diagonal
pairs should be connected for domestic hot water and central
®
INSTALLATION INSTRUCTIONS charnwood
Central Heating Flow
Central Heating Return
Drain Cock at Lowest Point
Drain Cock
GravIty Return 28mm
Gravity F low 28mm
Indirect Hot Water Cylinder
Cold Water Tank
Overflow
Feed and Expansion Tank
22mm Open Vents
Gravity Radiator
Circulating Pump
Minimum Return
Thermostat
Overflow
Domestic Hot Water Draw Off
Fig. 8. Typical Central Heating & Hot
Water System Using 4 Boiler Tappings
Central Heating Return
Drain Cock at Lowest Point
Drain Cock
Gravity Return 28mm
Gravity F low 28mm
Indirect Hot Water Cylinder
Domestic Hot Water Draw Off
Cold Water Tank
Overflow
Overflow
Feed and Expansion Tank
22mm Open Vents
Gravity Radiator
Circulating Pump
Injector Tee
Minimum Return Thermostat
Central Heating Flow
Fig. 9. Typical Central Heating & Hot
Water System Using 3 Tappings
Gravity Return
(28mm Pipe)
Central Heating Return Common Return to Boiler
(28mm Pipe)
Fig. 10. Injector Tee.
12


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