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Grillon - Buchère
Figure 3
Flue draught control box For top flue outlet only
1 - Spinner air wheel.
2.3. Connection to chimney
¤ TOP FLUE OUTLET
Use the draught control box (ill. 3).
The draught control box can be dismantled to give access
for flue cleaning.
¤ REAR FLUE OUTLET.
It is not possible to use the draught control box in this
position. Provision should therefore be made to fit a
draught regulator.
Important !
Don't forget to fit with an airtight seal the flue
collar and the blanking plate which are supplied and
packed in the firebox.
Caution : Sufficient access must always be left for chimney
sweeping and appliance cleaning.
2.4. Connecting the central heating circuit
In any installation relevant building codes of practices
must be observed.
¤ The appliance is not designed as a pressure vessel, so
the circuit must be left open to the atmosphere and must
not be constructed to allow any pressure build-up to occur.
¤ A gravity circuit MUST be provided, as a fail safe heat
loss in the event of a circulating pump failure or a power
cut. To achieve this, ensure that large diameter pipes
leading to upstairs radiators have a direct flow from the
boiler, or install a large indirect domestic hot water cylin-
der.
Fig. 4, 5 and 6
1 - Expansion tank
2 - Water cylinder
3 - Franco Belge appliance
4 - Flow control valve
5 - Radiators circuit
6 - Sweep tee
7 - Circulating pump
8 - Pipe thermostat
9 - Oil or gas boiler
10 - Four way mixing valve
11 - Eventual minimal flow by-pass
Technical manual
1
2
2 - Damper control.
Document n° 343-4EN ~ 10/11/1998
Fig. 4 - Example of installation 1
Gravity hot water tank, pumped central heating.
Fig. 5 - Example of installation 2
Gravity hot water tank, pumped central heating linked
to existing oil or gas boiler, pipe thermostat fitted onto
return pipe from the tank.
Fig. 6 - Example of installation 3
Pumped central heating gravity hot water tank four
way mixing valve.
Solid fuel boilers 921 series
21
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