2.5 The smoke pipe
The smoke pipe must be in compliance with the NF P 51-
201 (D.T.U. 24.1) standard.
Height of the smoke pipe stack (Fig. 3)
Canting of the smoke pipe (Fig. 4)
The current pipe :
- The pipe must be in good shape and must allow a
sufficient draught (optimum depression 15 to 20 Pa).
- The pipe must fit its use, if this is not the case it will be
necessary to proceed to a tubing or a jacketing of the
pipe.
- The pipe must be clean ; proceed with a sweeping with
a metallic flue brush to eliminate the deposits of soot and
remove wood tars.
- The pipe must have a sufficient thermal insulation ;
because when a pipe has cold linings it is impossible to
get a thermal draught and it leads to condensation.
- The smoke pipe must be waterproof and of normal
section and constant in its whole height (example 4dm2
to be used in an open fireplace and 2,5 dm² to be used in
a closed fireplace).
The thermal draught may become impossible because of
a too large pipe.
- The pipe must be joined up to one equipment only.
- It must be 6-7 meters high and must come out at least
40 cm above any constructed parts 8 meters away.
In the case of a flat roof or when the slope of the roof is
less than 15°, the stack must equal 1,20m (Fig. 3).
The chimney head must not stop the draught.
- If the chimney tends to have discharges, because of its
situation
regarding
surrounding
impediments,
we
recommend you to cap the chimney with a draught
diverter
or raise up the chimney.
- If the chimney’s depression exceeds 30 Pa, a draught
moderator must be installed on the chimney connector.
Chimney to be built / non-existent pipe.
- The chimney pipe must not lay on the fireplace.
- It must be kept away from any inflammable material
(framework, woodwork, light partition…)
- It must leave the possibility for a mechanical sweeping.
2.6 Joining up to the smoke pipe (Fig. 6)
- The equipment will be joined to the smoke pipe by
smoke pipes from the accepted trade to resist products of
wood combustion (for example : stainless steel,
enamelled sheet steel.
- The pipe’s diameter must not be inferior to the blast
pipe’s diameter of the equipment. If it is the case, the
reduction must be of an immediately inferior diameter of
the blast pipe and it must be located the farthest possible
from the connect to the equipment.
- The joining must vertically be done on a pipe leading
under the ceiling.
- The jointing of the joining pipe to the blast pipe of the
equipment as well as to smoke pipe will be tight. As far
as accommodation equipped with a CMV (Controlled
Mechanical Ventilation) to the blast pipe’s one and it must
be located as far as possible from the joining to the
equipment.
- The chimney connector and the draught moderator (if
necessary) must be visible, accessible and easily swept.
Allow for a maintenance door (500 x 350 mm) in the hood
to access the chimney connector as well as all pipes,
connectors, gate valves…
2.7 Chimney built around the fireplace
(Fig. 5)
- The chimney must conform to the current DTU 24.2.2
Standard.
- Respect the assembly instructions by the manufacturer
of the chimney.
- Do not wedge the appliance.
- Check the right operation of the mobile parts (valve,
door…) to avoid the sticking of the start up elements
(plaster, cement).
2.8 Connection to the central heating
2.8.1 Connection of the equipment Fig. 1
Return:
Connect the picking 26/34 plug located at the bottom of
the equipment at the return of the installation of the
central heating circuit.
Start:
Connect the 26/34 connector situated at the top of the
appliance to the starting point of the central heating
system circuit.
Do not block up any of these pickings.
The start and return piping must not be equipped
with any stop or severing valve.
2.8.2 Basic principle of joining
- In any case the heating engineer is liable for the
connecting to be done.
Expansion tank :
Installing an expansion pan on a closed or open circuit is
compulsory. Its sizing and positioning must be in
compliance with the DTU 65-1 1 standards.
Safety valve :
As well as the expansion pan, a safety valve complying
with the French Standard NF P 52-001 must be installed
(NF E 31-010 Standard). It must be directly connected to
the upper outlet of the appliance and its exhaust outlet
must be oriented in such a way that no bodily injury may
occur (see Fig. 8, 9 and 10).
In particular, there must be no connection tube or total or
partial blockage and control units between the apparatus
and the safety valve (§4.2.2.2 of standard NF P 52-203
DTU 65-11).
Thermal valve feed discharge :
When the system is fitted with an under pressure
expansion pan on a closed circuit, the appliance outlet
must be fitted with a thermal relief valve with its
temperature sensor.
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