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• COMBUSTION GAS REMOVAL
Flue: A draught diverter is fitted to the top of the water heater. The nominal flue
size is 90 mm. (D61B, D61E) and 110 mm. (G11E). In exposed situations, twin-
walled flue pipe should be used. A minimum length of vertically rising flue of 600
mm. must be provided to ensure the water heaters products of combustion are
completely evacuated. If single wall flue pipe is being used which has to pass
through combustible materials, provide a metal sleeve of 115 mm. diameter which
allows an air gap of 25 mm.
The flue shall not run into chimneys for removing combustion products from solid
or liquid fuels. Flue pipes and terminals should comply with BS 715. Terminals shall
not be sited within 300 mm. of a ventilator or open window. In the U.K. full details of
flueing requirements are given in BS 5440 Part 1.
The flow rate of the combustion gases is 14 m³/h (G-30 and G-31) and 14.54 m³/h
(G-20 and G-25). The temperature of the combustion gases at the exit draught
diverter hood is 137°C (Model D61E, D61B).
The flow rate of the combustion gases is 41.4 m³/h (G-30 and G-31) and 44.4 m³/h
(G-20 and G-25). The temperature of the combustion gases at the exit draught
diverter hood is 160°C. (Model G11E).
This appliance is fitted with a safety device to monitor the removal of combustion
gases, which cuts off the supply of gas to the burner, thereby turning off the appliance.
The function of this device is to detect (thermally) if products of combustion are not
being removed to the outside air by the flue, due to adverse weather conditions
causing a down draught down the flue, blockage in the flue or problems with the
ventilation supplying the air for combustion.
This device should never be deactivated or removed, as this would compromise the
safety of the occupants in the event of flue gas spillage.
Whenever any repairs are made to this device, only original parts should be fitted.
A check should always be made to ensure that the appliance works correctly. The
procedure is as follows:
a) Turn the appliance on.
b) If air does not blow back through the flueway due to bad weather conditions
(too much wind), the control device should not stop the appliance, at least
during 30 minutes of continuous operation.
If this test is carried out satisfactorily, the appliance is in perfect operating condition.
If the appliance repeatedly turns off, this means that the combustion gases are not
being removed correctly. The problem should be resolved by taking the
appropriate steps.
• AIR SUPPLY FOR COMBUSTION
Air requirements: Reference is made to BS 5482 BS EN 1949 and EN 721 covering
ventilation requirements for permanent dwellings, caravans and boats.
Fixed ventilation should be provided to avoid draughts as far as possible without
impairing the free area of ventilation, even in adverse weather conditions. If the heater
is positioned in location which may be subjected to strong draughts i.e. close to a
window or opening then strong draughts or gusts of wind may extinguish the pilot.
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