MCZ Hydrotherm 70 - Manual (Page 11)

INSTALLATION AND USE MANUAL
Chapter 2
page
11
Theoretical notions for installation Technical service – MCZ GROUP S.p.A. all rights reserved - Reproduction prohibited
30°
2.4. CONNECTION TO THE FLUE PIPE
The connection to the flue pipe is a very important element. The
connection must be made with a great deal of care; in the event of
erroneous or anomalous construction, it is extremely difficult to remedy
without damaging the hood liner. In addition, the connection is made in
a part of the stove where temperatures are very high, and for this
reason it is important to use materials that are capable of resisting heat
and also the acidity of the fumes produced by combustion.
Before beginning work, please note the following:
 The connecting pipe must have a maximum slope of 45
degrees. This is to avoid excessive deposit of condensation
produced in the initial phases of lighting the fireplace stove,
and/or the excessive accumulation of creosote. It also keeps
the release of smoke from being slowed down.
 The unions must be made of metal and suitable for the
specific operating conditions of the product and marked
EC (EN1856-2). The use of flexible and extending metal
pipes is not permitted.
 The components making up the connecting pipe must be
perfectly sealed.
 The joint to the flue pipe must not be too long (to avoid
obstructions), nor too short (to avoid smoke leakage).
If metal connecting pipes are used, they must be
insulated with suitable material such as ceramic fibre
matting, to avoid deterioration of the masonry and of
the decorative hood liner.
IMPORTANT!
Any increase in the section of the connecting pipe
must start immediately above the hood of the
fireplace and not along the flue pipe section.
2.4.1.
Smoke valve (optional)
In case of excessive draught in the flue chimney, combustion may
become unbalanced and consequently less efficient. In this case, in
order to improve combustion efficiency, it is advisable to install the
smoke valve (optional) directly at the output of the fireplace stove. If
you wish to position the control knob (B in the figure) at the front of
the product, it is necessary to place a 25 cm extension of the smoke
duct between the fireplace stove and the valve.
2.5. FLUE PIPE
The flue pipe is a fundamental element in discharging smoke and
therefore must have the following requisites:
 It must be waterproof and thermally insulated.
 It must be made with heat resistant materials, resistant to
combustion products and any condensation.
 have a vertical arrangement with deviations from the axis of
no more than 45° and without kinks.
 must be suitable for the specific operating conditions of the
product and marked EC (EN1856-1, EN1443).
Example of fireplace stove connection in
flue chimney
Illustration of a correctly constructed
chimney flue with a chamber and sealed
door (A) for solid combustion product
collection and discharge at the foot of the
external ascending segment.
Smoke
connection
Flue pipe
Hood grille
45° max
Smoke valve
A
B
Ceramic fibre
insulation