©
Euroheat
Distributors (H.B.S) Ltd. 2000 Instructions Part number IN10111 Edition C
12
5. Some Advice and Instructions
1) Question:
What happens if the chimney flue descends to a lower
floor (the cellar, for example)?
Answer:
The combustion gases involve some DEAD WEIGHT
when mixed with a pocket of cold air. This will have a
considerable detrimental effect on the drawing power
of the chimney.
Remedy:
It is necessary to block the chimney with a metal sheet
or concrete, etc. a few centimetres below the joint of
the connecting pipe. Sufficient depth for a debris trap
should be provided.
2) Question:
What happens if you wish to connect an appliance to a
chimney flue, to which another stove is already
connected?
Answer:
This is prohibited under the U.K. building regulations
and should not be allowed.
3) Question:
What happens when a chimney flue is excessively large?
Answer:
The combustion gases leaving the stove through a given
section expand suddenly, cool down and lose all
ascending force. The drawing power is, therefore, very
weak or non existent.
Remedy:
The chimney must be lined to give it a more suitable
size.
4) Question:
What happens if the flue draught is to low?
Answer:
The stove will be difficult to light, responding only slowly
to the demands of increased output and unable to reach
its full heating output.
Remedy:
a) Ensure there is enough free air to the stove.
b) The flue is of a suitable size and is not obstructed.
c) Consult installation instructions.
5) Question:
What happens if there is to much flue draught?
Answer:
This can seriously damage the stove. An environment
can be created akin to a Blacksmiths forge within the
body of the stove. Early signs of this is an uncontrolable
fire, the glass crazing on the inside. Later signs are burnt,
bent and buckelled cast iron internal stove parts.
Remedy:
Ensure the stove is installed and commissioned as per
the installation instructions so that a flue draught test is
carried out prior to use. A flue draught stabaliser can be
fitted to the flue and a flue draught reading again taken.
6) Question:
What do you do when a customer insists that the
appliance be fitted in poor conditions?
Answer:
Poor conditions can only arise mainly due to the chimney.
In this case the customer must be convinced that
modifications are necessary. It is always preferable to
abstain from taking action which will result in poor
installation and so poor stove operation.
7) Question:
Why must connecting flue pipes be inclined upwards?
Answer:
a) to prevent the gas from stagnating in the flue pipe;
b) to prevent condensation by cooling off the gas;
c) to prevent the sooting up of the pipes and the stove
itself.
8) Question:
What should the degree of incline be?
Answer:
Given that the ideal chimney is vertical, angles should
be avoided as far as possible and the incline should be as
close to vertical as is practicable. The further away from
the chimney the stove is placed, i.e., the more flue pipe
required, the greater their incline should be.
