MCZ HYDRO User Manual
Introduction
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8901137200
EN
USE AND MAINTENANCE
MANUAL
PART 1 - REGULATIONS AND ASSEMBLY
PELLET STOVES
Chapter 1
INSTALLATION AND USE MANUAL
page 2
Introduction
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INTRODUCTION .................................................................................................................................... 3
1. WARNINGS AND GUARANTEE CONDITIONS ..................................................................................... 4
1.1. SAFETY INSTRUCTIONS .................................................................................................................... 4
1.2. OPERATING WARNINGS .................................................................................................................... 5
1.3. WARNINGS FOR THE CORRECT DISPOSAL OF THE PRODUCT ............................................................. 6
1.4. GUARANTEE CONDITIONS ................................................................................................................ 7
1.4.1. Limitations ................................................................................................................................. 7
1.4.2. Exclusions .................................................................................................................................. 7
2. THEORETICAL NOTIONS FOR INSTALLATION ................................................................................... 9
2.1. Pellets .............................................................................................................................................. 9
2.2. PRECAUTIONS FOR INSTALLATION ................................................................................................. 10
2.3. OPERATING AREA ........................................................................................................................... 11
2.4. CONNECTION TO THE EXTERNAL AIR INTAKE ................................................................................. 11
2.5. CONNECTION OF SMOKE DISCHARGE PIPE ...................................................................................... 12
2.6. CONNECTION TO THE FLUE PIPE .................................................................................................... 14
2.7. CONNECTION TO AN EXTERNAL FLUE WITH INSULATED OR DOUBLE-WALL PIPE .............................. 14
2.8. OPERATING PROBLEMS CAUSED BY DRAUGHT DEFECTS IN THE FLUE .............................................. 15
2.9. PLUMBING CONNECTION ................................................................................................................ 16
3. INSTALLATION AND ASSEMBLY ...................................................................................................... 17
3.1. DRAWINGS AND TECHNICAL CHARACTERISTICS.............................................................................. 17
3.1.1. EGO HYDRO Dimensions .......................................................................................................... 17
3.1.2. STAR HYDRO Dimensions ......................................................................................................... 17
3.1.3. Dimensions of the HYDRO 15-22 version CLUB without domestic hot water production kit ............ 18
3.1.4. Dimensions of the HYDRO 22 version CLUB equipped with kit for domestic hot water production. . 18
3.1.5. Dimensions of the HYDRO 15-22 version SUITE without domestic hot water production kit ........... 19
3.1.6. Dimensions of the HYDRO 22 version SUITE equipped with kit for domestic hot water production. 19
3.1.7. Dimensions of the HYDRO 15-22 version MUSA without domestic hot water production kit ........... 20
3.1.8. Dimensions of the HYDRO 22 version MUSA equipped with kit for domestic hot water production. 20
3.1.9. Technical characteristics ........................................................................................................... 21
3.2. PREPARATION AND UNPACK ING .................................................................................................... 24
3.3. LATERAL CLADDING ASSEMBLY ....................................................................................................... 27
3.3.1. Assembly of profiles for inserting the steel sides-EGO ................................................................. 27
3.3.2. Assembly of profiles for inserting the ceramic and soapstone sides-STAR ..................................... 28
3.3.3. Assembly of the lower panel – Suite and Club Stoves ................................................................. 29
3.3.4. Installation of side tiles - Suite and Club Stoves ......................................................................... 30
3.3.5. Installation of ceramic top - Suite and Club Stoves ..................................................................... 30
3.3.6. Assembly of sides on the MUSA stove ........................................................................................ 31
3.4. PLUMBING SYSTEM CONNECTION ................................................................................................... 32
3.4.1. Connections to the system ........................................................................................................ 34
3.4.2. System filling ........................................................................................................................... 35
3.4.3. Water characteristics ................................................................................................................ 35
3.5. KIT FOR DOMESTIC HOT WATER PRODUCTION (Optional) Only for Suite/Club/Musa stoves ............... 36
3.6. EXAMPLE INSTALLATION DIAGRAMS ............................................................................................... 37
3.6.1. Installation diagram for heating system without domestic hot water kit
(EGO/STAR/SUITE/CLUB/MUSA) ............................................................................................................. 37
3.6.2. Installation diagram for heating system with domestic hot water kit (SUITE/CLUB/MUSA) ............ 38
3.6.3. Heating installation diagram in combination with a boiler ............................................................ 39
3.6.4. Heating installation in combination with a storage tank............................................................... 39
3.7. INSTALLATION OF AIR FILTER ........................................................................................................ 44
3.8. OPENING/CLOSING THE DOOR ....................................................................................................... 44
3.9. MAKING THE ELECTRICAL CONNECTIONS ....................................................................................... 44
PELLET STOVES
Chapter 1
INSTALLATION AND USE MANUAL
page 3
Introduction
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ATTENTION
This warning sign indicates that the message to which it
refers should be carefully read and understood, because
failure to comply with what these notices say can cause
serious damage to the stove and put the user's safety at
risk.
INFORMATION
This symbol is used to highlight information which is
important for proper stove operation. Failure to comply with
these provisions will compromise use of the stove and its
operation will not be satisfactory.
OPERATING SEQUENCES:
Indicates a sequence of buttons to be pushed to access
menus or to make adjustments.
MANUAL
Indicates that you should carefully read this manual or the
related instructions.
INTRODUCTION
Dear Customer,
We wish to thank you for choosing an MCZ product, specifically a stove
of the MCZ pellet line.
In order to get the best performance from your stove and to
enjoy to the full the warmth and the sense of well-being which
the flame will diffuse through the home, we recommend that
you read this booklet carefully before lighting the stove for the
first time.
While thanking you again, may we remind you that the stove MUST
NOT be used by children, and that they must always be kept at a safe
distance from it!
Revisions to the publication
In order to improve the product, to keep this publication up to date the
manufacturer reserves the right to make modifications without any
advance notice. Any reproduction, even in part, of this manual without
the consent of the manufacturer is prohibited.
Care of the manual and how to consult it
Take good care of this manual and keep it in a place which can
easily and quickly be reached.
If this manual should be lost or destroyed, or if it is in poor
condition, ask for a copy from your retailer or directly from the
manufacturer, providing product identification data.
Information which is essential or that requires special attention is
shown in bold text.
Italic text
is used to call your attention to other paragraphs in the
manual or for any additional clarifications.
SYMBOLS USED IN THE MANUAL
PELLET STOVES
Chapter 1
INSTALLATION AND USE MANUAL
page 4
Warnings and guarantee conciliations
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Installation of the stove, making the electrical
connections, checking its operation, and
maintenance are all tasks which should be carried
out by qualified and authorised personnel.
Install the stove in accordance with the
regulations in force in your local area, region and
country.
This apparatus cannot be used by people
(including children with limited physical, sensorial
or mental abilities or with little experience and
know-how unless they have been viewed or
instructed on the use of the apparatus by the
person responsible for its safety.
A bad use or unproper maintainance of the product
can bring to a serious risk of explosion in the
combustion chamber.
For the correct use of the stove and of the electronic
apparatus connected to it, and to prevent accidents, the
instructions given in this booklet must always be
followed.
Use, adjustment and programming must be carried out
by adults. Errors or incorrect settings may cause
hazardous conditions and/or poor operation.
Before beginning any operation, the user, or whoever is
preparing to operate on the stove, must have read and
understood the entire contents of this instruction booklet.
The stove is to be used only for its intended purpose. Any
other use is to be considered improper and therefore
hazardous.
Do not use the stove for standing on or as any kind of
support.
Do not put clothes to dry on the stove, any clothes
hangers and suchlike must be kept a suitable distance
from the stove. Danger of fire.
All responsibility for improper use is taken entirely by the
user and such use relieves MCZ of any civil or criminal
responsibility.
Any kind of tampering or unauthorised substitution of
non-original spare parts can be hazardous for the safety
of the operator and relieves MCZ of any civil or criminal
responsibility.
Most of the surfaces of the stove are extremely hot (the
door, the handle, the glass, smoke discharge pipes etc.).
Avoid coming into contact with these parts, therefore,
without adequate protective clothing or suitable
implements, such as gloves with thermal protection or
implements which keep the hands cool.
Under no circumstances should the stove be run
with the door open or the glass broken.
Do not touch the stove with wet hands, in view of the
fact that it is an electrical appliance. Always disconnect
the supply cable before doing anything to the unit.
Before carrying out any cleaning or maintenance
operation, make sure in advance that the stove is
1. WARNINGS AND GUARANTEE CONDITIONS
1.1. SAFETY INSTRUCTIONS
PELLET STOVES
Chapter 1
INSTALLATION AND USE MANUAL
page 5
Warnings and guarantee conciliations
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disconnected from the mains electricity supply, by turning
off the main switch located on the back of the stove, or
by unplugging the supply cable.
The stove must be connected to an electrical system
which is equipped with an earth conductor.
The system must be of adequate rated capacity for the
stated electrical power of the stove.
Incorrect installation or faulty maintenance (not
conforming to the requirements set out in this booklet)
can cause harm to people, animals or property. In such
cases MCZ is absolved from any civil or criminal
responsibility.
Live electrical parts: only power the product after
completing assembly.
Disconnect the product from the 230V power supply
before performing any maintenance operation.
IF ANY SMOKE SPILLAGE IS SEEN WITHIN THE
ROOM OR THE APPLIANCE SUFFERS FROM AN
EXPLOSIVE IGNITION PLEASE TURN OFF THE
APPLIANCE, VENTILATE THE ROOM AND CONTACT
THE INSTALLER/ SERVICE ENGINEER
IMMEDIATELY.
Shut the stove down in the event of a breakdown
or bad running and contact the engineer
immediately.
Pellets must not be fed manually into the burner
– this wrong behaviour can generate an
abnormal amount of unburned gas, with a risk of
explosion in the chamber.
Accumulated unburnt pellets in the burner after a
failed ignitions must be removed before lighting.
Failure too clean and maintain the brazier can result in
improper running and explosions within the stove. Make
sure you remove and clear the holes in the brazier and
any loose encrustations every time you empty the ash
from the stove or every time you have a failed
ignition.Make sure that the holes in the brazier are
never reduced in size as this will affect the safe
performance of the stove if not maintained.
Do not wash the inside of the stove with water.
Do not wash the stove with water. The water could get
inside the unit and damage the electrical insulation and
cause electric shocks.
A carbon monoxide alarm must be fitted in the
room where the appliance is sited Refer too ADJ
part 2.34 through too 2.36 page 41
Do not expose your own body to hot air for extended
periods. Do not overheat the room you are in and
where the stove is installed. This could cause injuries
and health problems.
Do not expose plants or animals directly to a current of
hot air. Both plants and animals could be harmed by it.
Do not put any fuels in the hopper but wood pellets.
Install the stove in a location which is suitable for
firefighting, and equipped with all services such as air
ONLY FOR UK
1.2. OPERATING WARNINGS
PELLET STOVES
Chapter 1
INSTALLATION AND USE MANUAL
page 6
Warnings and guarantee conciliations
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and electricity supply and provision for discharging
combustion gases.
If there is a fire in the flue pipe, extinguish the
stove, disconnect it from the power supply and
never open the door. Then contact the competent
authorities.
If the stove and the ceramic cladding are in storage, it
should be in a place that is free of damp, and they
should not be exposed to extremes of temperature.
It is inadvisable to base the stove directly on the floor,
and if the floor is made of flammable material, it must
be suitably insulated.
Do not light the stove with flammable materials
if the ignition system breaks down.
INFORMATION
In case of any problems, get in touch with your
dealer, or a qualified engineer authorised by
MCZ, and if a repair is necessary, insist on the
use of original spare parts.
Use only the fuel recommended by MCZ (for Italy
pellets with a diameter of 6 mm and for other
European countries with a diameter of 6-8 mm) and
provided only with an automatic supply system.
Periodically check and clean the smoke outlet ducts
(connection to the flue pipe).
Accumulated unburnt pellets in the burner after
repeated failed ignitions must be removed before
lighting.
The pellet stove is not a cooking appliance.
Always keep the cover of the fuel hopper closed.
Keep this instruction manual carefully because it
must stay with the stove throughout its working life.
If the stove is sold or transferred to another user,
always make sure that the booklet goes with the
product.
If it gets lost, ask MCZ or your authorised dealer for
another copy.
1.3. WARNINGS FOR THE CORRECT DISPOSAL OF
THE PRODUCT
The owner is the sole party responsible for demolishing and disposing of
the product. This must be performed in compliance with laws related to
safety and environmental protection in force in his/her country.
At the end of its working life, the product must not be disposed of as
urban waste.
It must be taken to a special differentiated waste collection centre set
up by the local authorities or to a retailer that provides this service.
Separating and recycling prevents potential negative effects on the
environment and health (often caused by inappropriately disposing of
product parts). It also allows materials to be recovered in order to
obtain significant savings in energy and resources.
PELLET STOVES
Chapter 1
INSTALLATION AND USE MANUAL
page 7
Warnings and guarantee conciliations
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MCZ guarantees the stove, excluding the components
which are subject to normal wear and tear, for a
period of two years from the date of purchase, as proved by
a supporting document which gives the name of the vendor
and the date on which the sale took place. The guarantee is
conditional on the guarantee certificate being filled in and
returned within 8 days, and requires that the product be
installed and tested by a specialised installer, according to
the detailed instructions given in the instruction booklet
supplied with the product.
The term 'guarantee' is to be understood to denote the freeof-charge replacement or repair of parts recognised to
have been defective at the start by reason of
manufacturing defects.
In order to activate the product warranty the
commissioning document which is supplied with the
appliance and also is available as a download from
the Specflue website must be filled in correctlty and
returned within 14 days.
ONLY FOR UK
1.4. GUARANTEE CONDITIONS
1.4.1. Limitations
The above guarantee does not cover components relating to electrical
and electronic parts, or fans, on which the guarantee period is 1 year
from the purchase of the product, documented as specified above. The
guarantee does not cover parts subject to normal wear such as gaskets,
glass, and any parts with can be removed from the firebox.
The replacement parts will be guaranteed for the remainder of the
guarantee period starting from the date of purchase of the product.
1.4.2. Exclusions
Variations in colour in the painted or ceramic parts, and crackling of the
glaze on the ceramics, do not constitute grounds for a claim under the
guarantee, as they are natural characteristics of the material and of the
use of the product.
The guarantee does not cover any parts which may be found to be
faulty as a result of negligence or carelessness in use, or of incorrect
maintenance, or of installation not complying with MCZ's specification
(see the relevant chapters in this user manual).
MCZ refuses to accept any responsibility for any damage which may be
caused, directly or indirectly, by persons, animals or things in
consequence of the failure to observe all the prescriptions laid down in
the instruction booklet, especially those concerning warnings on the
subject of installation, use and maintenance of the appliance.
If the product does not perform correctly, contact your local retailer
and/or importer.
Damage caused by transport and/or handling is excluded from the
guarantee.
For installation and use of the product, reference must be made
exclusively to the booklet supplied.
The guarantee will be invalidated in the event of damage caused by
tampering with the appliance, atmospheric agents, natural disasters,
electrical discharges, fire, defects in the electrical system, and caused
PELLET STOVES
Chapter 1
INSTALLATION AND USE MANUAL
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Warnings and guarantee conciliations
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CLAIMS UNDER THE GUARANTEE
the request for action under the guarantee must be
addressed to the retailer, who will forward the claim
to MCZ's technical assistance service.
MCZ refuses to accept any responsibility in the event
that the stove or any other accessory have been
improperly used or modified without authorisation.
For all replacement of parts, only original MCZ spare
parts must be used.
by lack of, or incorrect, maintenance in terms of the manufacturer's
instructions.
PELLET STOVES
Chapter 2
INSTALLATION AND USE MANUAL
page 9
Theoretical notions for installation
Technical service - Rights reserved MCZ GROUP S.p.A. - Reproduction prohibited
The poorer the quality of the fuel, the more often the
internal parts of the brazier and combustion chamber
must be cleaned.
The company strongly recommends using certified
fuel for its products (ENplus, DINplus, Ö-Norm
M7135).
Poor quality pellets or others that do not comply with
the characteristics specified previously may
compromise the operation of your product and can
therefore render the guarantee and product liability
invalid.
Fuel pellets
15 Kg sack of fuel
2. Theoretical notions for installation
The instructions contained in this chapter explicitly refer to the
regulations of the Italian installation Standard UNI 10683. In
any case, always comply with the regulations in force in the
country of installation.
2.1. Pellets
Wood pellets are manufactured by hot-extruding compressed sawdust
which is produced during the working of natural dried wood. The
compactness of the material is guaranteed by the lignin contained in
the wood itself and allows pellets to be produced without glue or
binders.
The market offers different types of pellets with characteristics that vary
according to the wood mixtures used. The most common diameter on
the market is 6 mm (although 8 mm diameter is available too) with a
length, on average, of between 3 and 40 mm. A good quality pellet has
a density of between 600 and 750 or more kg/metres cubed and a
water content that accounts for 5 to 8% of its weight.
Pellets have technical advantages besides being an ecological fuel, as
the wood residue is used completely, thereby achieving cleaner
combustion than that of fossil fuels.
Good-quality wood has a calorific value of 4.4 kW/kg (15% moisture,
after about 18 months of seasoning), whereas that of pellets is 4.9
kW/kg. To ensure good combustion, the pellets must be stored in a dry
place and protected from dirt. Pellets are usually supplied in 15 kg bags,
therefore, storing them is very convenient.
Good quality pellets guarantee good combustion, thereby decreasing
harmful emissions into the atmosphere.
The main quality certifications for pellets currently available on the
European market guarantee that the fuel complies with class A1/A2
according to ISO 17225-2. (formerly EN 14961). These certifications
include, for example, ENPlus, DINplus, Ö-Norm M7135, and in
particular, guarantee the following characteristics:
calorific value: 4.6 ÷ 5.3 kWh/kg.
Moisture content: ≤ 10% of the weight.
Percentage of ash: max 1.2% of the weight (A1 less than
0.7%).
Diameter: 6±1/8±1 mm.
Length: 3÷40 mm.
Content: 100% untreated wood without the addition of binding
substances (max 5% bark).
Packaging: in sacks made from ecologically compatible or
biologically decomposing material.
PELLET STOVES
Chapter 2
INSTALLATION AND USE MANUAL
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Theoretical notions for installation
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IMPORTANT!
Installation and assembly of the stove must be
carried out by qualified personnel.
IMPORTANT!
The stove must be connected to a flue pipe or a
vertical duct which can discharge the fumes at the
highest point of the building.
The fumes are however derived from the combustion
of wood products, and if they come into contact with
or close to walls, they can make dirty marks.
Also take care because the fumes are very hot but
almost invisible, and can cause burns on contact.
The holes for the passage of the smoke pipe and for
the intake of air from outside should be made before
positioning the stove unit.
2.2. PRECAUTIONS FOR INSTALLATION
The stove must be installed in a suitable position to allow the normal
operations of opening and ordinary maintenance.
The site must be:
capable of providing the environmental conditions for operation
equipped with power supply 230V 50 Hz
capable of taking an adequate system for smoke discharge
provided with external ventilation
provided with an earth connection complying with CEI
The stove must be connected to a flue pipe or an internal or
external vertical duct conforming to EN 1856-1-2 to suit the
appliance and types of fuels to be burnt – refer to detailed
guidance in sections 2, 3 and 4 in ADJ (ONLY FOR UK).
The stove must be positioned in such a way that the electrical
plug is accessible.
PELLET STOVES
Chapter 2
INSTALLATION AND USE MANUAL
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Theoretical notions for installation
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It is not permissible to install the stove in bedrooms,
bathrooms, or in a room where another heating
appliance is installed (fireplace, stove etc.) which
does not have its own independent air intake.
Locating the stove in a room with an explosive
atmosphere is prohibited.
The floor of the room where the stove is to be
installed must be strong enough to take its weight.
If the flooring is made of wood, provide a floor
protection surface in compliance with current
national standards.
Example of pellet stove installation
Example of pellet stove installation
2.3. OPERATING AREA
For proper functioning and a good temperature distribution, the stove
should be positioned in a location where it is able to take in the air
necessary for combustion of the pellets (about 40 m3/h must be
available), as laid down in the standard governing the installation and in
accordance with local national standards.
The volume of the room must not be less than 30 m3.
The air must come in through permanent openings made in walls (in
proximity to the stove) which give onto the outside, with a minimum
cross-section area of 100 cm2.
These openings must be made in such a way that it is not possible for
them to be obstructed in any way.
Alternatively, the air can be taken from rooms adjacent to the one
which needs ventilating, as long as they are provided with an air intake
from the outside, and are not used as bedrooms or bathrooms, and
provided there is no fire risk such as there is for example in garages,
woodsheds, and storerooms, with particular reference to what is laid
down in current standards.
If walls are flammable, maintain a minimum distance of 10cm at the
rear (A), 10cm at the side (B) and 100 cm at the front.
If the room contains objects which are believed to be particularly
delicate, such as drapes, sofas and other furniture, their distance from
the stove should be considerably increased.
2.4. CONNECTION TO THE EXTERNAL AIR INTAKE
It is essential that at least as much air must be able to flow into the
room where the stove is installed as is required for proper combustion
in the appliance and for the ventilation of the room. This can be
effected by means of permanent openings in the walls of the room to
be ventilated, which give onto the outside, or by single or collective
ventilation ducts.
For this purpose, on the external wall near the stove, a hole must be
made with a minimum free cross-section of 100 cm². (equivalent to a
round hole of 12 cm diameter or a square hole 10x10 cm), protected by
a grille on the inside and the outside.
The air intake must also:
communicate directly with the room where the stove is installed
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Chapter 2
INSTALLATION AND USE MANUAL
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Theoretical notions for installation
Technical service - Rights reserved MCZ GROUP S.p.A. - Reproduction prohibited
2
1
Pipes and unions with suitable gaskets must always
be used, to guarantee a hermetic seal.
All sections of the smoke duct must be inspectable and
removable to enable periodic internal cleaning. Tee
connectors with inspection caps should be used.
ONLY FOR UK
Example of pellet stove installation
Be protected by a grille, metal mesh or suitable guard, as long as
this does not reduce the area below the minimum.
be positioned in such a way as to be impossible to obstruct
2.5. CONNECTION OF SMOKE DISCHARGE PIPE
We recommend the use 100mm single wall connecting flue pipe.
All exterior flue or flue used internaly above 1.8m should be twin wall
insulated pipe installed in accordance with ADJ reference page 23
section 1.31 and 1.32 and 1.33 & Hetas regulations.
The combustion chamber works in low pressure. The smoke duct for
the discharge of fumes will also be under low pressure when connected
to an efficient flue pipe as directed.
Position the stove bearing in mind all the instructions and considerations
above.
PELLET STOVES
Chapter 2
INSTALLATION AND USE MANUAL
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Theoretical notions for installation
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IMPORTANT!
A 90 degree change of direction in the flue pipe must
be fitted with suitable tee connectors to allow the
possibility of inspection. (see accessories for pellet
stove)
It is absolutely prohibited to fit a grille on the end of
the discharge pipe, because it could lead to poor
running of the stove.
FOR CONNECTION TO THE FLUE PIPE, NOT MORE
THAN 150mm OF HORIZONTAL PIPE MUST BE USED
AND NOT MORE THAN 4 x 45° bends MUST BE USED.
I accordance with UK Building Regulations.
ONLY FOR UK
PELLET STOVES
Chapter 2
INSTALLATION AND USE MANUAL
page 14
Theoretical notions for installation
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This type of connection ensures the evacuation of the
fumes even in the event of a temporary power cut.
This type of connection ensures the evacuation of the
fumes even in the event of a temporary power cut.
0,5 mt.
1
2
3
1) Windproof cowl
2) Flue pipe
3) Inspection
0,5 mt.
2
1
3
1) Windproof cowl
2) Flue pipe
3) Inspection
ONLY FOR UK
2.6. CONNECTION TO THE FLUE PIPE
. In the event of larger dimensions, or of the flue pipe being in poor
condition (for example cracks, poor insulation, etc.), it is advisable to fit
a stainless steel pipe of suitable diameter inside the flue pipe
throughout its length, right up to the top.
At the bottom of the flue pipe, provide an inspection cap to allow
periodic checking and cleaning, which must be done annually.
Make a gas-tight connection to the flue pipe, using pipes and
connectors as recommended by us.
You must ensure that a windproof cowl should be fitted which complies
with the standards in force.
2.7. CONNECTION TO AN EXTERNAL FLUE WITH
INSULATED OR DOUBLE-WALL PIPE
The external fluepipe must have internal dimensions of a minimum of
150mm, and maximum 180mm.
Check with suitable instruments that there is a minimum draught
of 5 Pa. on low fire and 10pa on high fire. The flue must always
run under negative pressure and a cold flue pull of – 2>3 pascals
must be secured.
The only type of pipe which is permissible is insulated (double-walled)
stainless steel, smooth on the inside, fixed to the wall. At the bottom of
the flue pipe, provide an inspection cap to allow periodic checking and
cleaning, which must be done annually. Make a gas-tight connection
to the flue pipe, using pipes and connectors as recommended by us.
You must ensure that a windproof cowl should be fitted which complies
with the standards in force.
PELLET STOVES
Chapter 2
INSTALLATION AND USE MANUAL
page 15
Theoretical notions for installation
Technical service - Rights reserved MCZ GROUP S.p.A. - Reproduction prohibited
IMPORTANT!
The operation of the pellet stove is noticeably
sensitive to the conformation and position of the flue
which is adopted.
Hazardous conditions can only be overcome by
suitable setting-up of the stove carried out by
qualified MCZ personnel.
1
2 3
4
E.g. Crosswind 2: 8 m/sec
Depression of 30Pa
E.g. Downdraft at 45° of
8m/sec. Overpressure of 17
Pa
1-2 = High-pressure zones
3-4 = Low-pressure zones
WIND
Least favourable points
Most favourable position
WIND
Downdraft
High-pressure zone
Low-pressure zone
2.8. OPERATING PROBLEMS CAUSED BY DRAUGHT
DEFECTS IN THE FLUE
Of all the weather and geographical conditions which affect the
operation of a flue pipe (rain, fog, snow, altitude a.s.l., exposure to
sunlight, direction of facing), the wind is unquestionably the most
decisive. In fact, along with thermal depression caused by the
difference in temperature inside and outside of the chimney, there is
another type of depression or over-pressure: dynamic pressure caused
by the wind. An updraft always increases depression and hence
draught. A crosswind increases depression provided the cowl has been
installed properly. A downdraft always decreases depression, at times
inverting it.
Besides the direction and force of the wind, the position of the flue and
the cowl with respect to the roof of the building and the surrounding
landscape is important.
The wind also influences the operation of the chimney indirectly by
creating high-pressure and low-pressure zones, not only outside the
building but inside as well. In rooms directly exposed to the wind (2),
an indoor high-pressure area can be created which can augment the
draught in stoves and fireplaces, but it can be counteracted by the
external high pressure if the cowl is situated on the side exposed to the
wind (1). On the other hand, in the rooms on the opposite side from
the direction of the wind (3), a dynamic depression can be created
which competes with the natural thermal depression developed by the
chimney, but this can be compensated for (sometimes) by locating the
flue on the opposite side from the direction of the wind (4).
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