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Charnwood Country 16b - Multi-fuel Manual

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13
CENTRAL HEATING SYSTEM
SYSTEM CONTROLS
The central heating system must comply with BS:5449 part 1.
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:1556 part 1 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. 5 and 6. 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
heating. Where a common return is used an injector tee must
be incorporated into the system as shown in Fig. 7. This will
ensure that a good domestic hot water supply is maintained
when the central heating pump is operating.
The system must incorporate a gravity circuit which will
normally heat the domestic hot water and an unvalved
radiator with an output of at least 1 kW. When the appliance
is not connected to a domestic hot water system the unvalved
radiator(s) on the gravity circuit must have an output of at
least 1.25 kW. This is to prevent boiling in case of pump
failure. All pipework in the primary circuit must be 28 mm
diameter and the gravity flow pipe must rise continuously from
the boiler to the open vent. Two typical systems are shown in
Figures 5. and 6.
If the appliance is used to heat a small central heating system
then the heat output to the room from the fire will be
reduced.
Fitting a radiator in the same room as the fire is recommended
as it will allow greater flexibility in the way that the system is
operated as well as ensuring that there is sufficient heat.
Connect the heating system to the boiler ensuring that the
primary flow pipe rises continuously from the appliance to the
vent. Fill the system with water and check for leaks.
The circulating pump may be controlled by means of time
switches, room thermostats or outdoor thermostats.
Radiators may be either manually or thermostatically
controlled. These controls will all work in conjunction with
the thermostat on the appliance and the low limit pipe
thermostat.
®
INSTALLATION INSTRUCTIONS
Fig. 5. Typical Central Heating & Hot
Water System Using 4 Boiler Tapping
Central Heating Flow
Central Heating Return
Drain Cock at Lowest Point
Drain Cock
Gravity Return 28mm
Gravity Flow 28mm
Indirect Hot Water Cylinder
Cold Water Tank
Overflow
Feed and Expansion Tank
22mm Open Vents
Gravity Radiator
Circulating Pump
Central Heating Return
Drain Cock at Lowest Point
Drain Cock
Gravity Return 28mm
Gravity Flow 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
Gravity Return
(28mm Pipe)
Central Heating Return Common Return to Boiler
Central Heating Flow
Minimum Return
Thermostat
(28mm Pipe)
Overflow
Domestic Hot Water Draw Off
Fig. 7. Injector Tee.
Fig. 6. Typical Central Heating & Hot
Water System Using 3 Tappings
charnwood
… 13 …


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