Charnwood FB100 Operating & Installation Instructions Manual - page 7
gravity flow pipe, which gives priority to the domestic hot water, but
brings the pump on to heat the radiators when the flow pipe
temperature exceeds the set temperature. A minimum return pipe
thermostat will prevent cold water being pumped around the circuit
The stove and flue boiler may be installed as part of a larger system,
to provide back up or additional heat whilst the main boiler is not
operating. There are many ways in which this “Link Up” may be
achieved, and a basic link up system is shown in Fig 4. This uses a
“Dual Coil”cylinder. In this way the Flue Boiler is able to input heat
into the system without affecting the circulation in the other primary
coil(s). Similarly, if the other heat source is operating and the stove is
not lit, then there will be very little effect on the circulation through
the flue boiler. Additional controls such as an electronic timer may be
added in the “Link up” case if required and in some instances the
controls of the main boiler may be extended to control a pump in the
flue boiler circuit.
Fig 4. Basic Link Up system. Flue Boiler provides
input to existing system via Dual Coil Tank
Gravity Return (28mm Pipe)
Central Heating
Return
Common
Return to Boiler
(28mm Pipe)
Fig 5. Injector Tee as used in Fig 3 .
Domestic Hot
Water Draw Off
Drain Cock at Lowest Point
Drain Cock
Gra
vity R
e
turn 28mm
Gra
vity Flo
w 28mm
Dual Coil Hot
Water Cylinder
Cold Water Tank
Overflow
Overflow
Feed and Expansion Tank
22mm Open Vents
Heat Leak
Gravity Radiator
Flue Boiler
Additional Heat
source, e.g. oil or
gas boiler, solar
heating panel etc.
Fig 6. Free standing Installation
Double Insulated
Flue Pipe
Flue Connector
Flue Boiler
Stove
Hearth
Water
Flow
Water
Return
Access Door
Support Bracket
Fig 7. Horizontal Register Plate Into Conventional Chimney
Flue Boiler
Stove
Hearth
Water
Flow
Water
Return
Access Door
Register Plate
Soot Door
With Soot Door
Alternative
Positions
®
INSTALLATION INSTRUCTIONS
7
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