Protherm Gepard 23 MOV v.19 User manual

23 MOV v.19
23 MTV v.19
Wall-hang non-condensing boiler
Power 8,5 - 23,3 kW
Flow heating HW
Gepard
version
User manual
EN

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CONTENTS
STUDY THIS MANUAL CAREFULLY
Read me1 ..................................................................................................... 3
Welcome1.1 ........................................................................................... 3
User’s quick start manual1.2 ................................................................. 3
Commissioning the boiler2 ........................................................................... 3
Description of the device2.1 .................................................................. 3
Commissioning the boiler2.2 ................................................................. 5
Shutting down the boiler2.3 ................................................................... 5
Manufacturer’s documentation3 ................................................................... 5
Storing of documents3.1 ........................................................................ 5
Explanation of symbols3.2 ..................................................................... 6
Safety regulations4 ....................................................................................... 6
What to do if you smell gas?4.1 ............................................................ 6
Safety regulations4.2 ............................................................................. 6
Warranty / Obligations5 ................................................................................ 7
Warranty details5.1 ................................................................................ 7
Using the device / Obligations of the manufacturer5.2 .......................... 7
Recycling6 .................................................................................................... 7
Packing list7 ................................................................................................. 8
HOW TO USE THE BOILER
Using the equipment8 .................................................................................. 9
Overview8.1 ........................................................................................... 9
Turning on and off8.2 ............................................................................. 9
User settings8.3 ..................................................................................... 9
Regulation of the boiler8.4 …............................................................... 10
Boiler connection parameters8.5 ..........................................................11
Connecting the boiler to the CH, HW and gas piping8.6 ......................11
Operating pressure in the heating circuit8.7 ........................................ 12
Admitting water into the heating circuit8.8 ........................................... 12
Discharging water from the boiler8.9 ................................................... 12
Expansion tank8.10 ............................................................................... 12
Safety valve8.11 .................................................................................... 13
Hooking up gas8.12 ............................................................................... 13
Operating sketch of 23 MOV8.13 .......................................................... 14
Operating sketch of 23 MTV8.14 ........................................................... 15
Air and exhaust lines8.15 ...................................................................... 16

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CONTENTS
Connecting the boiler to the electricity supply8.16 ................................ 21
Boiler wiring diagram8.17 ...................................................................... 23
NEED HELP?
Troubleshooting9 ........................................................................................ 24
Safety regulations10 ..................................................................................... 26
Servicing and maintenance of the boiler11 .................................................. 26
Cleaning11.1 ......................................................................................... 26
Regular servicing11.2 ............................................................................ 26
Replacement parts11.3 ......................................................................... 26
Regulations12 .............................................................................................. 26
Converting to different fuel13 ....................................................................... 27
Contact your sales service centre14 ............................................................ 27
Available system pressure15 ....................................................................... 27
Technical parameters16 ............................................................................... 28

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STUDY THIS MANUAL CAREFULLY
Read me1
Welcome1.1
This manual is part of the equipment and
following installation it must be provided
to the user in compliance with valid
regulations.
Study the handbook carefully to ensure
a safe installation, safe use and proper
service. We are not responsible for any
damage resulting from failure to follow the
instructions presented in this handbook.
mode –+
Gepard
3
5
2
4
6
1
reset
User’s quick start manual1.2
We have prepared this User’s manual to
help you start to use your equipment right
away.
It is assumed in this manual that the
equipment has been installed and
commissioned by a qualified technician.
iStudy closely the “Safety”
and “Warranty” chapters,
which contain important safety
information.
1 RESET key
2 MODE key
3 Display
4 " - " key
5 " + " key
6 Main switch
Commissioning the boiler2
Description of the device2.1
GEPARD boilers are compatible with
the usual types of hot water circuits and
radiators.
A network of service providers who
meet the mentioned requirements work
under contract to the manufacturer to
commission the boilers and to provide
warranty and after-warranty service.

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The boiler (as well as all its optional
accessories) complies with the
requirements of European Directive
90/396/EEC on gas-fuelled appliances
and European Directive 92/42/EEC
on efficiency, the European Directive
2006/95/EC on electrical means of
operation for use in certain voltage ranges
and the European Directive 89/336/EEC
on electromagnetic compatibility.
The appliance is also approved according
to the European norms EN 677, EN 625,
EN 60335-01, EN 50165, EN 55014, EN
61000-3-2 and EN 61000-3-3.
In order to operate and handle the boiler
in accordance with the purpose for which
it is designed in actual conditions of use
(hereafter referred to only as use), it is
necessary to abide also by additional
conditions – the most essential of which
(i.e. those which must not be omitted)
are found in the following regulatory
documents:
- in the design area: STN 06 0310 and
STN 06 0830;
- in the fire safety area: STN 92 0300;
- for installation and fitting (and repairs):
STN EN 1755 or STN 38 6460, as
applicable STN 38 6462, Decree no.
48/1982 Coll. (as amended by the
later prescriptions) and the binding
occupational health regulations;
- in time of running and operation: STN 38
6405;
- in the area of discharge of combustion
gases and air inflow STN EN 483,
company material – “catalogue of dual
piping for discharge of combustion gases
and inflow of combustion air designated
for type C gas appliances, i.e. in closed
“TURBO” version.
The boiler is designated for operation
within the normal AA5/AB5 environment in
compliance with STN 33 2000-3 and STN
33 2000-5-51 (i.e. a temperature range of
5 – 40°C, temperature-dependent humidity
to a max. of 85%).
GEPARD boilers are suitable for the
conditions of zones 1, 2 and 3, in rooms
with a bath or shower and in washing
areas as set out in STN 33 2000-7-701;
they may not be installed in zone 0 (Fig.8).
Before installation in the areas mentioned,
protection against electric shocks must be
provided for according to the same norms.
The boiler complies with Ministry of Health
Decree No 13/1977 Coll., i.e. on noise, for
installation in residential and public areas.
The boilers are built to operate with
heating water, in compliance with STN 07
7401. (Above all, the water must never
be acidic, i.e. its pH must be higher than
7 and it should have minimal carbonate
hardness.)
The requirements regarding the
characteristics of domestic water are
set out in STN 83 0616 (potable water
STN 75 7111). With regards to water with
total material concentrations of calcium
and magnesium greater than 1.8 mmol/l,
further “non-chemical“ measures against
scale deposits (e.g. operation of magnetic
water treatments in combination with
settling equipment) are advisable.
Silting up of the boiler with contaminants
from the heating system or the settling of
boiler scale on these disturbances, or on
induced disturbances (e.g. silting up of the
exchanger, pump breakdowns) are not
covered by the boiler warranty.
The distance from flammable materials
(e.g. PVC, fibreboard, polyurethane,
synthetic fibres, rubber etc.) must be

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sufficient to keep the surface temperature
of these materials below 80°C.
The minimum working (unhindered) space
in close proximity to the boiler must be
such that the boiler can be worked with
easily and safely with bare hands and with
the usual hand tools; we recommend a
minimum distance of 300 mm from up and
under, 10 mm from side and a minimum of
600 mm in front of the boiler.
CH (heating) + HW (hot water)-
The GEPARD boilers supplies both central
heating and hot water for the home.
Non-condensing boiler with exhaust-
vented to a chimney
Model MOV must be fitted to a ventilation
system (chimney). The boiler comes
equipped with a safety device that shuts
off the gas feed if the chimney becomes
blocked.
Non-condensing boiler with forced-
extraction of exhaust.
The MTV model is gas model fitted with
a ventilation system for the intake of air
and the venting of exhaust. Thanks to
this ventilation system, the heater can be
installed in any space.
If the ventilator fails or if the chimney
becomes blocked, the pressure switch
shuts down the heater.
The boiler must be installed and
commissioned by a qualified technician.
This ensures proper installation and
operation in compliance with valid norms.
If any maintenance, repair or adjustments
concerning the gas are needed, a qualified
technician must be called.
PROTHERM has developed tailor-made
accessories that will help you use your
heater with maximum efficiency.
Commissioning the boiler2.2
Installation of the boiler and its first start-
up must be carried out by authorised
service personnel only!
If you wish to start the boiler after it has
been commissioned, ensure that:
It is hooked up to the electricity supply-
All the shut-offs and valves (CH, HW,-
gas) under the boiler are open
The CH pressure is within the-
recommended range of 1 – 2 bar.
Shutting down the boiler2.3
Turn off the master switch.
If the boiler is to be shut down for an
extended time, close all the valves
(CH, HW, gas) underneath it. The shut-
down must take into account the water
temperature in the boiler and the outside
temperature in the given season. If there
is a danger of frost, drain all water from
the boiler, the heating system and the hot
water piping (see the paragraph 8.9 on
page 12).
Manufacturer’s documentation3
Storing of documents3.1
This manual must be stored near the•
equipment to allow it to be accessed
when needed. If you should move
house, you must leave this manual
near the device in order to allow the
new owners to find it.
To ensure safe and efficient use of•
your boiler, study the instructions and
observe them carefully
We bear no responsibility for damages
resulting from failure to observe the
instructions.

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Explanation of symbols3.2
aDANGER: Risk of injury.
eDANGER: Risk of electric
shock.
bPCAUTION: Risk of damage
to the equipment or its edge
parts.
iIMPORTANT: Useful
information.
Safety regulations4
What to do if you smell gas?4.1
If you smell gas:
Do not search for the leak with an open-
flame.
Do not turn on any electrical switches,-
telephones or any other devices that
could spark an explosion.
Immediately open all windows and-
doors to ventilate the area.
Shut off the flow of gas at the safety-
valve.
Alert all other persons in the building.-
Call from outside from your house the-
emergency assistance services of your
gas supplier.
Safety regulations4.2
The following regulations and safety
instructions must be observed:
Never tamper with the safety devices.•
Do not modify the equipment or its•
immediate surroundings, as this could
affect the safe use of the boiler.
Do not under any circumstances•
destroy or remove the sealing from any
of the parts.
Never carry out alone any maintenance•
or repairs to the equipment. Only
qualified technicians may work with the
equipment.
Be careful not to allow children to play•
with the boiler.
Do not plug or obstruct the ventilation•
system.
Some home “improvements” may
significantly affect the functioning of
the boiler. Before carrying out any such
intervention you must consult with the
installer.
Do not site the equipment in excessive•
dampness.
Do not use and do not store explosive•
or flammable materials (e.g. gasoline/
petrol, aerosols, thinners, chlorine-
based cleaning agents, paints, glues
etc.) in the same space as the boiler.
Under certain conditions these
materials may be corrosive.
Do not touch the equipment surfaces•
- e.g. the ventilation pipes, hydraulic
connectors and so on — even after the
boiler has been turned off, as these
surfaces may be hot. Touching these
surfaces may lead to burns or scalding.
Be prudent when using the hot water•
tap. Water coming out of this tap may
be scalding.
This equipment contains metal parts
(components). In working with it and in

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cleaning it, particularly its corners, you
must be careful.
If water leaks from the unit you must•
immediately turn off the cold water
intake and the leak must be repaired by
a qualified technician.
Do not store any objects on top of the•
equipment.
Warranty / Obligations5
Warranty details5.1
PROTHERM’s Gepard boiler is covered
by warranty as set out by the Warranty,
Service log and other conditions listed in
the service and installation manuals.
Using the device / Obligations of5.2
the manufacturer
The above-specified warranty is valid if:
The equipment was installed by a-
qualified technician in accordance with
the installation guidelines.
The equipment is used for domestic-
purposes and in compliance with the
operation and maintenance instructions
of the manufacturer.
All servicing, maintenance, repairs,-
dismantling of or working with the
equipment during the warranty period
is carried out by a qualified technician
only.
Repairs or replacement of parts during-
the warranty period do not extend that
period.
The manufacturer bears no responsibility
whatsoever for any damages resulting
from:
Any type of damage arising from-
incorrect or incomplete installation,
inadequate servicing or incorrect hook
up of gas or water.
Any type of damage to a system to-
which the equipment is connected.
Any type of damage caused by-
incorrect protection against freezing.
Any type of damage or faulty set-up-
caused by changes of character or
pressure of gas or water or changes in
electric voltage.
For further information please study the•
Conditions.
aThis equipment may be
installed only in countries
listed in the descriptive
plaque.
Recycling6
Most of the boiler is comprised of
recyclable materials.
The equipment packaging must be
properly recycled.

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Packing list7
1
2
3
6
7
4
5
8
9
Legend
1 Boiler
2 Draw bar
3 Exhaust gas diffuser (only for MTV)
4 Sealing
5 Template
6 Butt-end of water intake
7 Butt-end of outlet valve
8 Service manual
9 Warranty

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HOW TO USE THE BOILER
HOW TO USE THE BOILER
Using the equipment8
Overview8.1
Turning on and off8.2
The boiler is turned on and off at the main
switch, which is located on the control
panel of the boiler.
Display icons8.2.1
When you turn on the boiler, the display
shows the current status of the boiler:
if the boiler is not lit (do not heat HW-
eighter CH) - so called ˝stand-by˝
mode, the display shows the current
water pressure in the heating system
and tap symbol and radiator symbol on
the left side of the display
while heating CH, the symbol flame is-
light in bottom left side and the radiator
icon will begin to flash; the display
will show the real-time CH water
temperature
while heating HW, the upper right-
corner will show the flame icon and the
water tap icon will begin to flash. The
display will show the real-time water
pressure in the system
if the pressure of the heating water-
in the system falls below 0.5 bar, the
radiator symbol and current water
pressure value begins flash together. If
the pressure in the system falls furthest,
then when pressure falls below 0.3 bar
the radiator symbol and water pressure
value 0.0 bar begins flash together. In
this situation the system pressure must
be topped up by letting in water. Once
the pressure in the system reaches a
value of 0.5 bar, display shows real-
time status of the boiler again
if pressure rises above 2.4 bar, the-
real-time pressure reading begins to
flash. In this case the water pressure
in the heating system must be lowered
by draining water. Once the system
pressure falls below 2.4 bar the display
will again portray the real-time status of
the boiler.
User settings8.3
Choice of heating mode8.3.1
The GEPARD boiler can work in various
modes:
heating mode - press the MODE key-
once. The display will portray the real-
time pressure in the system and the
radiator icon. In this mode the boiler
heats only CH water; HW heating is
locked out
SUMMER mode - press the MODE key-
twice. The display will portray the water
tap icon and the real-time pressure in
the system. In this mode, the boiler
responds only to requests for hot water;
the central heating is locked out
VACATION mode - press the MODE-
key three times. The display will show
only the real-time pressure in the
system and OFF symbol. In this mode,
both hot water and the central heating
are locked out. All the protective
functions of the boiler are active.
Setting the hot water8.3.2
temperature
Press the (+) or (-) key, and the tap
icon will begin to flash and °C. Pressing
the (+) or (-) keys sets the desired HW
temperature anywhere in the range of 38 -
60°C, at one-degree increments.

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HOW TO USE THE BOILER
Setting the temperature of the8.3.3
central heating water
Press the (+) or (-) key, followed by the
MODE key, and the radiator icon and °C
will begin to flash. Pressing the (+) or (-)
keys sets the desired CH temperature
anywhere in the range of 38 - 80°C, also
at one-degree increments.
Regulation of the boiler8.4
Operating the boiler without a8.4.1
room regulator
In this mode the boiler will maintain the
chosen CH temperature. A room regulator
is not connected; connection terminals
have to be interconnected (supplied by the
manufacturer).
Set-up:
Press the main On/Off switch-
Set the desired CH temperature on the-
control panel
Operating the boiler with a8.4.2
room regulator
If a room regulator is used, the CH
temperature must be restricted at the
boiler control panel to the maximum
recommended for your heating system
(to avoid damage to your system), and
which can also cover the thermal losses of
the property at low outside temperatures.
Heating of the central heating water
can then be managed by the regulator,
which will permit only that maximum CH
temperature you have set at the control
panel.
Note: In spaces with a regulator there
should be no thermostatic valves on the
radiators.
Caution: The manufacturer assumes
no responsibility for damages resulting
from faulty setting of the boiler or room
regulator.
On/OFF regulator8.4.3
The boiler will maintain the selected
CH temperature. Boiler operation is
interrupted (turned on and off) according
to the internal temperature in the room in
which the room regulator is located.
Regulator with output8.4.4
modulation function selected
The room regulator continuously regulates
the boiler output into the heating circuit
based on the indoors temperature.
Boiler operation with8.4.5
isothermal regulation
The boiler regulates the CH temperature
based on changes in the outside
temperature. For this type of regulation
it is necessary to use a regulator with an
isothermal regulation function (Protherm
Thermolink B, Thermolink P or Thermolink
RC) and to connect it to the outside
temperature sensor.
Caution: Setting the maximum CH water
temperature on the boiler control panel
may influence the isothermal regulation.
The CH water temperature selected at
the boiler control panel is also the limiting
temperature; The room regulator setting
cannot override the heat limit temperature
set at the boiler control panel. Setting
an appropriate CH water temperature
at the boiler control panel is one way to
guard against exceeding the maximum
allowed temperatures into the heating
system (floor heating). Despite this, we
recommend placing into the heating
system a supplementary safety armature
that will guard against a harmful increase
in temperature.
Caution: The room regulator and external
sensor may be connected by authorized
service personnel only.

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HOW TO USE THE BOILER
Boiler connection parameters8.5
Gepard 23 MOV8.5.1
311
410
742
179
205
Ø125
Gepard 23 MTV8.5.2
311
410
Ø39
742
184
205
82 65 116 65 82
205
26
160
134
Connecting the boiler to the CH,8.6
HW and gas piping
The boiler connection terminals may not
be placed under undue pressure from
the piping system for the CH circuit,
the HW circuit or from the gas intake.
This assumes a precise observance
of the dimensions of the endings of all
connecting pipes, with regard to height as
well as distance from walls and separation
distances of the interconnected individual
intakes and outlets.
The heating system circuit should be
connected to the boiler in such a way that
during repairs to the boiler the heating
water need be released only from the
boiler.
During reconstructions, in adverse building
arrangements and so on, the boiler may
be connected to the CH heating system,
the HW system and the gas inlet with
flexible elements (hoses), but only those
designated for this purpose. If flexible
elements are used, these should be as
short as possible and must be protected
from mechanical and chemical stresses
and damages. It must also be ensured
that before the end of their life cycle or
reliability in maintaining their parameters
(according to their manufacturers’ data)
they are always replaced by new ones.

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HOW TO USE THE BOILER
Note: The boiler includes filter which is
situated below the HW flow sensor. You
have to take out the HW flow sensor with
filter to clean up the filter.
Operating pressure in the heating8.7
circuit
The heating system (measured at the
boiler) must be filled to a hydraulic
pressure of at least 1 bar (corresponding
to a hydrostatic height of water of 10 m.)
The recommended pressure range is
between 1 - 2 bar.
Admitting water into the heating8.8
circuit
Bringing water into the heating system
(small quantities only) can be done via the
inlet valve on the boiler.
When filling the boiler the following
conditions must be observed:
The water pressure on entry into the-
boiler must always be higher than the
water pressure in the CH circuit.
Water is drawn into the boiler strictly-
in a cold state (CH temperature in the
boiler up to 30°C).
The recommended water pressure in-
the cold boiler (up to 30°C) is between
1 – 2 bar.
The pressure in the expansion tank-
is checked and if necessary adjusted
to the correct value (see technical
parameters on end of this manual).
Discharging water from the boiler8.9
The outlet valve is designated primarily for
lowering the water pressure in the boiler
during repairs. Only a partial discharge of
water from the boiler is possible through
this outlet.
A complete draining of water from only
the boiler or the heating circuit and repeat
filling must be carried out at inlet/outlet
valves at appropriate locations in the
heating circuit.
Discharging and filling of water into
the heating circuit and the subsequent
operations (air venting, regulating the
expansion tank) are not covered by the
boiler warranty.
If the HW in the boiler and piping is
threatened with freezing, appropriate
measures must be taken to avoid this
entirely.
Note: The release valve is located on the
right side of the boiler at the pump.
Expansion vessel8.10
Before filling the CH system, check the
pressure in the expansion chamber. The
initial pressure in the expansion chamber
should be greater by 0.2 bar than the
static height of the water column of the
heating circuit.
Water may then be released into the CH
system. Filling water pressure should be
0,2 – 0,3 bar higher than the pressure in
the expansion chamber. Filling pressure is
controlled from the cold state by the gauge
on the water side after bleeding.

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HOW TO USE THE BOILER
The valve for topping up the pressure in
the expansion chamber is on the right
side.
Caution: Confirm that the expansion
chamber is sufficient for the given quantity
of water in the CH circuit (see the project
installation documentation).
Safety valve8.11
The safety valve is located the underside
of the boiler on the left of the hydraulic
block. Draining from the safety valve
may lead (if the maximum pressure in
the system is exceeded) to the outflow
of water or the escape of steam. For
overflow that may emerge through the
safety valve, it is therefore recommended
to install a bleeder that feeds into the
sewerage system of the property.
Caution: Do not under any circumstances
manipulate the safety valve during the
operation of the boiler. The safety valve
furthermore may not be used for releasing
water from the boiler or the heating
system. The settling in the valve of detritus
from the heating system is not covered by
the warranty.
Hooking up gas8.12
The GEPARD version of the boiler is
designated for operation with natural gas
with a rated pressure in the piping system
of 2 kPa, for which a heating value from 9
to 10 kWh/m3is most often specified. The
dimensions of the internal gas distribution
piping and gas meter must be adequate
to handle the other gas appliances of the
user.
Gas lines in buildings must be installed in
compliance with STN EN 1775.
Caution: It is recommended that the
gas inlet into the boiler be tightened by
fastening a union nut on the top face of
the socket through the corresponding
sealing (see the Packing list).
aAfter completing the
installation of the gas piping
into the boiler the gas-
tightness of the completed
connection must be checked
thoroughly.

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HOW TO USE THE BOILER
Operating sketch of 23 MOV8.13
1
ABCDE
1
2
3
4
5
6
7
8
9
10
20
19
17
18
16
14
13
12
15
11
Legend
1 Safety valve
2 Gas valve
3 HW exchanger
4 Discharge valve
5 Burner
6 Ignition electrodes
7 NTC CH water intake temperature
sensor
8 Combustion chamber
9 CH exchanger
10 Exhaust gas collector
11 Combustion thermostat
12 NTC CH return water temperature
sensor
13 Expansion tank
14 Ionising electrode
15 Pump
16 CH pressure sensor
17 3–way motor valve
18 HW flow sensor
19 HW filter
20 Inlet valve
A CH outlet
B HW outlet
C Gas inlet
D HW inlet
E CH inlet

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HOW TO USE THE BOILER
Operating sketch of 23 MTV8.14
1
2
3
4
5
6
7
8
9
10
11
ABCDE
21
20
18
19
17
15
14
13
16
12
Legend
1 Safety valve
2 Gas valve
3 HW exchanger
4 Discharge valve
5 Burner
6 Ignition electrodes
7 NTC CH water intake temperature sensor
8 Combustion chamber
9 CH exchanger
10 Exhaust gas collector
11 Ventilator
12 Air manostat
13 NTC CH return water temperature sensor
14 Expansion tank
15 Ionising electrode
16 Pump
17 CH pressure sensor
18 3–way motor valve
19 HW flow sensor
20 HW filter
21 Inlet valve
A CH outlet
B HW outlet
C Gas inlet
D HW inlet
E CH inlet

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HOW TO USE THE BOILER
Air and exhaust lines8.15
The type MOV is designed for combustion
gases to be removed and discharged into
a chimney (through a chimney inlet) with
a minimum stabilised thrust of 2 Pa. The
boiler is connected to the chimney inlet by
a flue of a diameter corresponding to the
size of the boiler’s gas exhaust outlet. It is
forbidden to place inside the combustion
gases exhaust ducting any objects which
impair the combustion gases flow (e.g.
various types of heat exchangers to utilise
their residual heat). The combustion gases
exhaust ducting is not part of the boiler
accessories.
Construction of the combustion gases
exhaust ducting as well as that of the
chimney must comply with relevant
requirements. Compliance with the
requirements specified by these standards
will prevent undesirable phenomena from
occurring, such as excessive cooling of
the combustion gases, penetration of
dampness into brickwork and fluctuations
in the chimney thrust, and thus prevent
undesirable effects on the boiler’s
functioning.
The boiler takes combustion air from
the space in which it is installed. Air
must be supplied in sufficient quantity in
accordance with applicable regulations.
Venting of exhaust and drawing in of
combustion air for the MTV type is done
only through designated pipes.
The level sections of the piping slope at a
gradient sufficient to let the condensation
drain towards an outside area or
towards a receptacle designed to draw
off condensation. To achieve this, the
elbow joint may be gently bent away
from the straight section. The upright
sections of the piping are always fitted
with devices to draw off condensate. The
devices for drawing off the condensate
are installed where possible close to the
passage where the exhaust exits the
boiler. Breakdowns caused by leaking
condensate are not covered by the boiler
warranty.
Methods of air and flue gas8.15.1
ducting (according to STN
EN 483) and permitted piping
lengths
If not described otherwise for the
individual following methods of placing
coaxial pipe routes and their drainages,
the piping lengths (from connection at the
boiler to the drainage) can be set as in the
following cases.
Note: One Em is considered as either a 1
m direct section or one 90° joint.
Caution: If the lengths described for
individual types are exceeded, the exhaust
diffuser (orifice) must be removed from the
ventilator drain.
The following methods of air intake and
exhaust venting are recommended for the
boiler:
The C8.15.2 12 method
Level routes and level venting into an
open area.
Length of fume ducting (23 MTV):
60 / 100: min. 0.3 m (with one 90°-
joint), max. 3 m (with one 90° joint).If
the total fume ducting length is more
than 0.5 m, the diffuser with a diameter
of 39 mm must be removed.
80 / 125: min. 0.5 m (with one 90°-
joint), max. 9 m (with one 90° joint).If
the total fume ducting length is more
than 1 m, the diffuser with a diameter of
39 mm must be removed.

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HOW TO USE THE BOILER
An example of a level coaxial pipe route:
version C12 (complies with STN EN 483)
The C8.15.3 32 method
Vertical routes and vertical venting into an
open space.
Length of fume ducting (23 MTV):
60 / 100: min. 1 m (with one 90° joint),-
max. 4 m (with one 90° joint). If the total
fume ducting length is more than 1.5 m,
the diffuser with a diameter of 39 mm
must be removed.
80 / 125: min. 1 m (with one 90° joint),-
max. 10 m (with one 90° joint). If the
total fume ducting length is more than
1.5 m, the diffuser with a diameter of 39
mm must be removed.
An example of a vertical coaxial pipe
route: version C32 (complies with STN EN
483)
The C8.15.4 42 method
Connecting to a double shared chimney.
Double piping from independent boilers
(independent routes) can feed into shared
chimneys; the transport capacity of
the chimney is judged according to the
manufacturer’s data on the chimney. If
the pipes are set into the chimney in two
directions and vertically aligned, there
must be a vertical separation between
the outlets of at least 0.45 m. Where two
outlets vent towards each other, they
must be separated by a minimum vertical
distance of 0.6 m. The exhaust piping into
the shared double chimney never has
terminal elements — the same as with
pipes that vent into open areas!
Both components of the route — external
(air) and internal (exhaust gas) — must
safely feed into the relevant chimney duct
but not protrude so deeply that they create
blockages in the exhaust or air ducts.
Length of fume ducting (23 MTV):
60 / 100: min. 0.3 m (with one 90°-
joint), max. 3 m (with one 90° joint). If
the total fume ducting length is more
than 0.5 m, the diffuser with a diameter
of 39 mm must be removed.

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HOW TO USE THE BOILER
The C8.15.5 52 method
Separate double piping and venting into
different areas (with different parameters,
mainly of pressure)
For venting exhaust and bringing in air for
combustion, separate piping may be used.
The separate piping may not be routed on
opposing walls of the building.
Length of fume ducting (23 MTV):
80 / 80: min. 2 x 0.5 m, max. 2 x 18-
m. If the total fume ducting length is
more than 2 x 2 m, the diffuser with a
diameter of 39 mm must be removed.
The C8.15.6 82 method
Using piping in cases where the air is
drawn in from an open area and the
exhaust vents into a shared chimney.
Length of fume ducting (23 MTV):
80 / 80: min. 2 x 0.5 m, max. 2 x 18-
m. If the total fume ducting length is
more than 2 x 2 m, the diffuser with a
diameter of 39 mm must be removed.
Air may in the same way be brought in
from an open space (or a space well