User`s manual

INSTALLERUSERTECHNICIAN
1313
• Temperature loss in insulated ducting. To avoid the
problem of flue condensation in insulated exhaust
Ø 80 pipes, due to cooling via the wall, the ex-
haust pipe length must be restricted to 12 metres.
The figure above illustrates a typical insulation ap-
plication in which the intake pipe is short and the
exhaust pipe very long (over 5 m). The entire in-
take pipe is insulated to prevent condensation of
humid air in the boiler environment in contact with
the cooled pipe conveying cool outdoor air. The
entire exhaust pipe is insulated with the exception
of the elbow on output of the splitter, to reduce heat
dispersion from the duct and prevent formation of
flue condensate.
N.W.: when installing the insulated ducts, a sec-
tion clamp with pin must be installed every 2 me-
tres.
• Snap fit extension pipe fittings and elbows. To in-
stall snap-fit extensions with other elements of the
boiler assembly, proceed as follows: fit the con-
centric pipe or elbow with the male section (smooth)
on the female section (with lip seal) to the end stop
on the previously installed to ensure sealing effi-
ciency of the couplings.
• Insulation of separator terminal. In the event of
problems of condensation of flues inside the ex-
haust pipes or on the outside surface of the intake
pipes, on request Immergas supplies insulated in-
take and exhaust pipes. Insulation may be neces-
sary on exhaust pipes due to excessive drops in
temperature of flues during conveyance from the
boiler and on the intake pipes as air on input (cold)
may cause the external pipe temperature lower
than the dew point of the ambient air. The figures
below illustrate different applications of insulated
pipes.
Insulated pipes comprise an internal Ø 80 concen-
tric pipe and a Ø 125 external pipe with static air
jacket. Technically it is not possible to start with
both Ø 80 elbows insulated as clearances will not
allow this type of installation. However an insulated
elbow can be used by selecting either the intake
or exhaust pipe. If an insulated intake pipe is used,
the flange must be inserted to the end stop on the
flue extraction flange to ensure that the height of
the two intake and exhaust outlets is aligned.
1.5 Flue exhaust via flues.
Flue exhaust does not necessarily have to be
connected a branched type traditional flue. Flue
exhaust can be connected to a special LAS type
multiple flue. Flues must be specially designed
according to specifications in the standard UNI-CIG
10641 by qualified professional personnel.
Chimney or flue sections for connection of the
exhaust pipe must comply with requirements as laid
down in standards UNI-CIG 7129 and UNI-CIG
10641.