Protherm Leopard 24 BOV Operating instructions

b c
Leopard
User and Installation
Instructions
24 BTV / v.17
24 BOV / v.17
XXXX
Wallhung gas boiler
DHW preparation
Power 9 - 24kW

d 1
Mandatory warning for CEE countries
Warning: This appliance is designed, approved and inspected to meet the
requirements of the market. The identificationplate located on the inside of the
appliance certifies the origin where the product was manufactured and the country
for which it is intended.
If you see any exception to this rule, please contact your nearest dealer.
Thank you in advance for your assistance.
CE Mark
This boiler meets the requirements of Statutory Instrument No. 3083 The boiler
(Efficiency) Regulations, and therefore is deemed to meet the requirements of Directive
92/42/EEC on the efficiency requirements for new hotwater boilers fired with liquid or
gaseous fuels.
Type test for purposes of Regulation 5 certified by: Notified body 1015.
Product/production certified by: Notified body 1015.
The CE mark on this appliance shows compliance with:
1. Directive 90/396/EEC on the approximation of the laws of the Member States
relating to appliances burning gaseous fuels.
2. Directive 73/23/EEC on the harmonization of the Laws of the Member States relating
to the electrical equipment designed for use within certain voltage limits.
3. Directive 89/336/EEC on the approximation of the Laws of the Member States
relating to electromagnetic compatibility.
24 BTV/BOV
Table of contents
Introduction ...........................................2
Important notes ......................................2
Safety of life and property ......................3
User instruction
Control and signaling .............................4
Boiler indication......................................5
Water temperature setting......................5
Fault messages ......................................6
Boiler Start and Switch-Off.....................7
Boiler Regulation....................................7
Protective features of the boiler..............8
Servicing and maintenance....................9
Note: The boiler serial number is marked on the data label attached to the fascia
behind the front panel. Refer to the ‘Introduction’ section for a description of the basic
functions of the boiler. The ‘User’ section describes how to safely operate the boiler.
The "Installation " is meant for workers of specialized companies..
Warranty conditions .............................10
Technical parameters ...........................11
Boiler schematic...................................13
Dimensions and pressure available .....14
Installation instruction
Introduction ..........................................15
Boiler installation..................................18
Flue gas and air ducts..........................22
Example of horizontal duct flue............25
Example of vertical duct flue ................22
Electrical part .......................................27
Electrical diagrams...............................28
Conversion to LPG ...............................30

2 3
workshops, offi c es, etc. and as a flow
heater of domestic hot water (DHW).
We believe it will serve you to your
full satisfaction – certain minimum
requirements must be fulfilled to that end.
That is why we are asking you to study and
follow these instructions carefully.
You have become an owner of a wall-
hung combination boiler, for natural gas
or LPG. The boiler 24BTV 17 with forced
flue gas removal and 24BOV 17 with flue
gas removal by means open chimney
draught are designed for heating up
the heating circuit water (CH) in central
heating systems in flats, family houses,
Please, keep the following rules in
mind:
• The boiler and all accessories must be
installed and used in compliance with
the design, the applicable laws, technical
regulations and the manufacturer’s
instructions.
• The boiler can only be installed in the type
of environment for which it is designed.
• Only service centers authorized by the
manufacturer are allowed to put the boiler
into operation after installation.
• In case of defects, call a service
centre authorised by the manufacturer
– incompetent intervention can damage
the boiler (and/or the accessories)!
• The service centre’s employee who initiates
the boiler operation after installation shall
instruct the user about the boiler, its parts
and operation.
• Check completeness of the delivery.
• Check to make sure the supplied boiler
type complies with the expected manner
of use.
• If you feel uncertain about any activities
related to the boiler operation, look up
and study all relevant information in these
instructions, and follow the recommended
procedure.
• Do not remove or damage any labels or
markings on the boiler.
• It is not allowed to tamper with inner fitting
and wiring or make changes. In case of
reparation, all parts must be approved by
producer of boiler.
• If the boiler is going to be switched off
for a longer time, it is recommended to
disconnect boiler from the electricity source
and close gas valve.This recommendation
is valid with reference to condition in these
Instruction (e.g. the anti-freeze protection
is inactivated then)
• When the life cycle of the boiler, or its parts,
has expired, they should be disposed of in
an environmentally friendly manner.
• Producer do not provide warranty
and do not answer for damage due to
infringement of:
- conditions mentioned in these
Instructions
- valid Regulations and Standards
- correct installation and use
- conditions mentioned in Guarantee
Certificate and Service Booklet
Dear Customer
Important notes
• Boilers as products are checked for
compliance with the following documents:
EN 483, EN 437, EN 625, EN 50 165, EN
60 335-1:1997.
• The installation of this boiler must be
carried out by a competent person in
accordance with the relevant requirements
of the current issue of:
- the Gas Safety (Installation and Use)
Regulations,
- the Building Regulations,
- the local water company Bylaws,
- the Building Standards Regulation,
- the Health and Safety at Work Act
• Besides the requirements as expressed
in the above-cited documents, these
Instructions for Use and the boiler
documentation provided by the
manufacturer are to be followed. During
use, no children, drug-intoxicated or
legally irresponsible persons should be
allowed to tamper with the boiler.
Abbreviations used:
CH – heating circuit water,
DHW – domestic hot water.
Safety of life and property
In practice, situations may occur
in which the users must apply
necessary precautions:
• Preventing the boiler from switching on
(also accidental) when inspecting the
chimney, flue-gas duct, water and gas
piping – i.e., electricity supply to the boiler
must be stopped (e.g., by unplugging) in
addition to using the boiler switch;
• Stopping the boiler whenever flammable
or explosive vapours appear (even if
temporarily) – such as vapours of flooring
glue, paints when surface finishing, gas
leaks, etc.);
• If it is necessary to discharge water
from the heating system, it must not be
dangerously hot;
• If water has leaked from the boiler
exchanger, or if the exchanger is filled
with ice, no attempts to start the boiler
should be made until normal operating
conditions prevail.
• If there is a (whether confirmed or
suspected) gas leak or stoppage in the gas
supply, switching off the boiler, shutting
down the gas supply and calling gasworks
or a specialised service centre

4 5
Main on/of switch
The main on/off switch (see fig.1) is on
the bottom of the boiler, below the control
panel.
Caution: Commencing and first start of the
boiler operation may only be carried out by
a specialised service centre! Only turned on
boiler has activated all protective function
(e.g. anti-freeze protection).
Control panel
It serves for indication of actual parameters
and for setting or changing required values
this parameters.
1- heating system pressure LED
(indication of the heating water
pressure)
2- domestic hot water LED
(indication DHW taking or domestic hot
water temperature setting)
3- central heating LED
(indication of the heat requirement or
heating temperature setting
4- fault message LED
(indication of faults in boiler operation)
5- decrease button (-)
(decrease the setting value of
parameters)
6- increasing button (+)
(increase the setting value of
parameters)
7- display
(showing of pressure, temperatures,
service parameters and fault
messages)
8- MODE button
(switches between setting modes and
corfirms setting value of parameters)
Control and Signaling
USER INSTRUCTONS
fig. 1
fig. 2
Actual circuit heating water tem-
perature indication in °C.
LED 3 under symbol
lights continuously. The
actual temperature of he-
ating water flowing from
boiler is displayed.
Domestic hot water temperature
indication in °C (required value).
Domestic hot water tap
is open. LED 2 under
symbol lights continu-
ously. DHW temperature
corresponds with requi-
red value in certain DHW
flow range.
Water pressure in central heating
system in Bar.
LED 1 under symbol
lights continuously. Re-
commended range is
1 - 2 Bar. Pressure is
displayed for 30 sec.
after one pressing
button.
Domestic hot water temperature
setting in °C.
Temperature is displayed
for 30 second after two
pressing button,
LED 2 under symbol
flash.
Buttons set domestic water tem-
perature to following values: 35, 37, 38,
39, 40, 41, 44, 47, 50, 55, 60°C. Setting
symbol means no preparation do-
mestic hot water.
Setting value are saved into memory
after next pressing button (if it's
not confirmed until 30 sec., the previous
setting is saved again)
Circuit heating water temperature
setting in °C.
Temperature is displayed
for 30 sec. after three
pressing button,
LED 3 under symbol
flash.
Buttons set central heating water
temperature to following values: 38, 40,
42, 45, 50, 55, 60, 65, 70, 75, 80°C. Set-
ting symbol switches central heating
off (SUMMER adjustment).
Setting value are saved into memory
after next pressing button (if it's
not confirmed until 30 sec., the previous
setting is saved again).
Boiler indication during ordinary operation (display mode)
Water temperature setting
Warning on wrong pressure in he-
ating system under value 1 Bar (or
over 2,5 Bar).
Boiler still works. LED 1
under symbol flash.
It is necessary to fill up
(or drain) the heating
system to pressure 1- 2
Bar soon.

6 7
No flame - F1
Boiler is switched off, for
example by reason of
gas supply failure. LED 4
under symbol flash.
Boiler can be restarted by
switching off and on ( from position „I” to
position „0“ and again to position „I“ by
mains on/off switch). If fault is frequent,
call service centre.
Loss of circuit heating water - F0
Pressure is under 0,7
Bar. Boiler is switched off,
LED 1 and LED 4 under
symbols and flashes.
After filling system up to
1- 2 Bar the boiler automatically starts.
For filling can be used refilling valve at
the bottom of boiler (see fig. 4). If fault is
frequent, call service centre.
Other boiler faults (from F2 to F8)
Boiler switched off itself.
LED 4 under symbol
flash. It is necessary to
call service centre.
Fault messages
fig. 3
Operation diagram
Boiler memory fault - F9
Boiler works, but possi-
bility changes in setting
exists. LED 3 under sym-
bol lights continuously.
Switch the boiler off and
on ( from position „I” to position „0“ and
again to position „I“ by mains on/off
switch). Then check boiler parameters
(see Water temperature setting). Let
check the boiler setting by service centre
occasionally.
Factory setting:
- DHW temperature 60°C
- CH temperature 50°C
- max. heating power 15 kW
Note: The preparation for and commencing
of the boiler operation may only be carried
out by a specialised service centre!
Before starting the boiler when it
has been put into operation, check
the following facts:
• The power cord must be plugged into the
socket.
• The gas valve that feeds the boiler must
be open.
• The water pressure in the heating system
should be between 1 and 2 bar
Now the boiler is ready to be started.
Boiler start
Set the mains on/off switch to the “on”
position (“I”). Display light up.
Note: In case of safety switch-off due to
extinction of flame or the flue thermostat
reaction (version 24 BOV) LED 4 under
symbol starts flash.
Boiler can be un-
blocking by switching the boiler off and on
( from position „I” to position „0“ and again
to position „I“ by mains on/off switch).
In case of safety switch-off due to overheat
thermostat Led 4 under symbol flash
too, but boiler can be unblocking only by
service centre and this act is not guarantee
repair.
Warning: The boiler must not be operated
if the safety elements (e.g. overheat
thermostat, flue termostat) are disabled
or replaced with elements different from
those specified by the manufacturer.
Boiler switch-off
Set the mains on/off switch to the “off”
position (“0”).
If the boiler is going to be switched off
for a longer time, it is recommended to
disconnect boiler from the electricity source
and close gas valve. This must be done
with reference to ambient temperature,
because there is the risk of freezing boiler
and system in frost weather.
Setting SUMMER mode (only DHW)
• Start the boiler;
• Select “– –” for CH temperature as
described under Control and Signalling
(CH temperature setting);
• Activate the basic state by MODE button.
Setting WINTER mode (CH + DHW)
• Start the boiler;
• Select the CH temperature instead of “– –”
as described under Control and Signalling
(CH temperature setting);
• Activate the basic state by MODE button
Boiler Start and Switch-Off
Operation without a room
thermostat
Boiler keeps CH temperature on
setting value. The room thermostat is
not connected; its contacts must be
interconnected (by utilizing a jumper).
• Set the desired temperature value as
described under Control and Signalling
(CH temperature setting);
Operation with a room thermostat
Boiler keeps CH temperature on setting
value, with breaks in operation dependent
upon the temperature in the room in which
the thermostat is installed. The radiator in
that room must not be equipped with a
thermostatic valve head. The settings are
the same as the operation without the room
thermostat, but the jumper is removed and
the room thermostat is connected to the
contacts.
Boiler Regulation
Pressure in system DHW temperature CH temperature
Pressing MODE button
Keep the pressure CH
on 1 - 2 Bar by filling
or draining system
Confirm by MODE Confirm by MODE

8 9
Anti-freeze protection of the system
The boiler has build-in protection against
freezing water in boiler (no in whole heating
system or DHW pipes).The boiler is always
started if the CH temperature is below 4°C
and works until CH temperature reaches
8°C. This protection is independent on
room thermostat or SUMMER mode (CH
water temperature setting – – )
Pump protection
The pump is automatically switched on for
a short time (approximately 30 sec.) if it
has not been operated for 24 hours – thus
clogging by sludge sedimentation in the
pump’s bearings is prevented.
Anti-cycling function
This function restrict too repeated starts
of boiler to heating system and it is useful
especially in smaller heating system, when
required heating power is smaller than
minimal boiler's thermal power output.
Next start is delayed in range from 1min
30 sec to 5 min.
Overheating protection
If the CH temperature is higher than the
pre-set value of 80°C, the pump is always
switched on and continuously operated.
If temperature further increases, safety
thermostat shut boiler down, and
thermostat must be unblocked by service
centre.
In case water loss the boiler shut down too,
but it will be reactivated automatically when
the pressure increases again.
Disconnected boiler from el. source
Should the boiler be disconnected from
the electricity source for a long time
(continuously for one month or longer),
it should be regularly reconnected and
switched on (at least once a month). If the
pump is blocked, always call a specialised
service centre. Repairs of the pump caused
by impurities in the heating system are not
covered by the boiler’s warranty.
Warning: The protective functions are
only active if the boiler is plugged into the
electrical grid socket and the main switch
is on (in the “I” position).
Stoppage and recovery of electricity
supply
If there is a stoppage in electricity
supply, the boiler is switched off. When
the electricity supply is recovered, the
boiler will switch on, without a loss of the
parameters.
If the F1 fault message is shown on the
display after the electricity supply recovery,
turn mains on/off switch from position „I” to
position „0“ and again to position „I“ (see
Control and Signalling).
If the boiler does not restart, the overheat
device may need resetting by a specialised
service centre.
Protective features of the boiler
Note: Circuit heating water temperature
must be set on value, that ensure sufficient
heat suply to heated space in case of low
outside temperature.
Heating power setting
Boiler's power factory setting is 15 kW to
heating system.The maximal power 23 kW
is always available for preparing DHW. Only
service centre authorized by manufacturer
can change heating power in accordance
with requirement of heating system.
Servicing and maintenance
Refilling water to heating system
Caution: The boiler is installed as part
of a sealed system which must only be
drained and filled by a competent person.
Common user can fill and drain boiler in
order to keep the heating water pressure
in recommended range 1-2 bar.
When refilling, follow these conditions:
• The pressure of the water source must be
higher than that of the water in the heating
system;
• The temperature in CH has to be lower
than 30°C.
• Recommended water pressure in cold boiler
(to 30°C) is in range from 1 to 2 bar.
Pump after-running
The pump after-running is standardly set
from factory on 45 sec after shutdown
of boiler by room termostat. If no room
thermostat is used, the pump runs
contuniously.
Above-mentioned adjustment can be
changed on the 45 second pump running
after burner stop. This is recommended in
case regulation without room thermostat
Caution: The chages of the pump affter-
running can makes only competent person
autorised by the manufacturer.
Safety valve
The boiler is equipped with a safety valve.
DO NOT TOUCH THE SAFETY VALVE! If
water is leaking from the valve, switch the
boiler off, unplug it and call a specialised
service centre. Only qualified persons
are allowed to fill the boiler with water or
discharge water from the boiler. If there is
a repeated drop of pressure, discuss the
defect with your service centre.
Air flow rate safety device (for version
24BTV with forced flue gas removal)
If an obstruction, even partial, of the flue
occurs, the built in safety system of the
boiler will turn the boiler off. The boiler will
be ready to operate when the fault has
been cleared.
Chimney draft control system (for
version 24BOV with flue gas removal
by means open chimney draught)
If the chimney draught is impaired or
blocked, gas supply is stopped and the
boiler is automatically shut down and it
will light up fault F1 display on the control
panel. The boiler can be start after cooling
up the flue-gas safety thermostat by turning
the mains on/off switch from position „I” to
position „0“ and again to position „I“.
Note: If the pressure in the water mains
were the same or lower than that in the
heating system, there would be a risk of
heating water entering the water mains,
which must not be allowed. The risk is
lowered by installing a backflow valve on
the water-supply pipe in boiler.
The manufacturer is not liable for any
damages caused by tampering with the
refilling or draining valve or failures to
adhere to the above conditions. No dam-
ages or defects so caused are covered
by the boiler’s warranty.

10 11
The warranty on boilers is provided as
specified in the Guarantee Certificate,
Service Booklet and under conditions
specified in these Instructions for Use
and Instructions for Installation (in chapters
Introduction, Boiler installation).
Warranty conditions
Too high pressure in central heating
system:
If it's necessary to reduce pressure in
CH or drain the boiler, can be used the
tap at the bottom of boiler (see fig. 12 in
Installation instruction) Water in CH has
to be cold (max. 30°C), DHW setting and
heating setting have to be ´– –´. Be careful
during draining to prevent damages caused
by water flowing from boiler.
Caution: The frequent water loss indicates
the water escape from system. Too small
pressure in cold system together with too
high pressure in warm system indicates
too much water in system or little air in
expansion vessel. Call service centre
soon.
Cleaning
The boiler can be cleaned with a wet
cloth and then dried and polished with
a dry cloth. Never use any abrasives or
thinners.
Caution: Before cleaning switch the boiler
off by mains on/off switch (to position „0“)
Maintenance and inspections
Checks and maintenance on the boiler
should be regular, at least once a year.
Such inspections are not covered by the
warranty. The Service Booklet contains a
checklist for such inspections, that can
provide only service centre authorised by
manufacturer.
Refilling procedure:
• Check if the power cord is plugged into the
socket and the gas valve that feeds the
boiler is open. The main on/of switch is in
position „I“.
• Press MODE button to display pressure in
heating system. If the pressure is under 0,7
bar, LED under symbol flash.
• Slowly open the refilling valve and
simultaneously watch the pressure increase
on the display. Pressure is displayed only
30 second after pressing MODE button.
The valve is opened counter-clockwise,
closed clockwise.
• Fill the system to pressure 1 - 2 bar.
• When the desired pressure is achieved,
shut the valve (without applying excessive
force) and check that the water pressure is
not growing (which would occur if the valve
were not closed properly).
fig. 4
Refilling valve
Category . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . II2H3P
Design . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B11BS
Ignition . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . electronic
Gas . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . G20 . . . . . . . . . . . . G31
Max. thermal power input . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25.5 . . . . . . . . . . . . 25.5
Min thermal power input . . . . . . . . . . . . . . . . . . . .kW . . . . . 10.0 . . . . . . . . . . . . 10.0
Max. thermal power output . . . . . . . . . . . . . . . . . . .kW . . . . . 23,0 . . . . . . . . . . . . 23.0
Min. thermal power output . . . . . . . . . . . . . . . . . . .kW . . . . . .8.5 . . . . . . . . . . . . . 8.5
Efficiency . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . % . . . . . . . . . . . . . . 90
Gas consumption (Q max / Q min) . . . . . . . . . . . . . . . 2,72/1,08 m3/h . . . . 2,11/0.89 kg/h
Noise level (1m from boiler, at a height of 1.5 m) .dB(A) . . . . . . . . . . .up to 55
Nox class . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Gas pressure
Input pressure . . . . . . . . . . . . . . . . . . . . . . . . . . . . mbar . . . . . 20 . . . . . . . . . . . . . 37
Pressure on burner max/min . . . . . . . . . . . . . . . . mbar . . . 12/2,2 . . . . . . . . . . 35,5/6,9
Nozzle diameter . . . . . . . . . . . . . . . . . . . . . . . . . . mm . . . . . .1,2 . . . . . . . . . . . . . 0,7
Heating
Max. working pressure . . . . . . . . . . . . . . . . . . . . . .bar . . . . . . . . . . . . . . 3
Min. working pressure . . . . . . . . . . . . . . . . . . . . . . .bar . . . . . . . . . . . . . .0,8
Recommended working pressure . . . . . . . . . . . . . .bar . . . . . . . . . . . . . 1 - 2
Temperature range . . . . . . . . . . . . . . . . . . . . . . . . . °C . . . . . . . . . . . . 38 – 80
Expansion vessel . . . . . . . . . . . . . . . . . . . . . . . . . litre . . . . . . . . . . . . . . 5
Max. quantity of water in heating circuit . . . . . . . . litre . . . . . . . . . . . . . . 70
Max. pressure in expansion vessel . . . . . . . . . . . . .bar . . . . . . . . . . . . . . 3
Domestic hot water (DHW)
Max. input pressure . . . . . . . . . . . . . . . . . . . . . . . .bar . . . . . . . . . . . . . . 6
Min. input pressure . . . . . . . . . . . . . . . . . . . . . . . . .bar . . . . . . . . . . . . . . 1
Min. water flowrate . . . . . . . . . . . . . . . . . . . . . litre per min . . . . . . . . . .2.7
Adjustable temperature range . . . . . . . . . . . . . . . . °C . . . . . . . . . . . . 35 – 60
Flowrate at 25°C temperature increase . . . . . litre per min . . . . . . . . . 12.5
30°C temperature increase . . . . litre per min . . . . . . . . . 10.8
35°C temperature increase . . . . litre per min . . . . . . . . . .8.8
Electrical data
El. voltage / frequency . . . . . . . . . . . . . . . . . . . . . V/Hz . . . . . . . . . . .230 / 50
El. power input . . . . . . . . . . . . . . . . . . . . . . . . . . . . W . . . . . . . . . . . . . . 95
El. protection class . . . . . . . . . . . . . . . . . . . . . . . . . IP . . . . . . . . . . . . . . 45
El. current . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A . . . . . . . . . . . . . . .0.5
Connections
Heating water in/out . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . G 3/4"
DHW in/out . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . G 1/2"
Gas . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . G 1/2"
Flue
Flue diameter . . . . . . . . . . . . . . . . . . . . . . . . . . . . mm . . . . . . . . . . . . . 125
Flue gas temperature . . . . . . . . . . . . . . . . . . . . . . . °C . . . . . . . . . . . . 95-120
Required chimney draft . . . . . . . . . . . . . . . . . . . . . .Pa . . . . . . . . . . . . . . 2
Weight flowrate – flue gas . . . . . . . . . . . . . . . . . . .g/s . . . . . . . . . . . . . . 20
Dimensions
Height / Width / Depth . . . . . . . . . . . . . . . . . . . . . . mm . . . . . . . . . 740 /410 / 320
Weight . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . kg . . . . . . . . . . . . . . 33
fig. 6
Technical parameters 24 BOV

12 13
fig. 5
Technical parameters 24 BTV
Category . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . II2H3P
Design . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . C12 , C32, C42, C52, C62, C82
Ignition . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . electronic
Gas . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . G20 . . . . . . . . . . . . G31
Max. thermal power input . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25.0 . . . . . . . . . . . . 25.0
Min thermal power input . . . . . . . . . . . . . . . . . . . .kW . . . . . 10.5 . . . . . . . . . . . . 10.5
Max. thermal power output . . . . . . . . . . . . . . . . . . .kW . . . . . 23,0 . . . . . . . . . . . . 23.0
Min. thermal power output . . . . . . . . . . . . . . . . . . .kW . . . . . .8.5 . . . . . . . . . . . . . 8.5
Efficiency Qnom . . . . . . . . . . . . . . . . . . . . . . . . . . % . . . . . . . . . . . . . . 91
Gas consumption (Q max / Q min) . . . . . . . . . . . . . . . .2,64/1,1 m3/h . . . . . 2,1/0.89 kg/h
Noise level (1m from boiler, at a height of 1.5 m) .dB(A) . . . . . . . . . . .up to 55
Nox class . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Gas pressure
Input pressure . . . . . . . . . . . . . . . . . . . . . . . . . . . . mbar . . . . . 20 . . . . . . . . . . . . . 37
Pressure on burner max/min . . . . . . . . . . . . . . . . mbar . . . 12/2,2 . . . . . . . . . . 35,5/6,9
Nozzle diameter . . . . . . . . . . . . . . . . . . . . . . . . . . mm . . . . . .1,2 . . . . . . . . . . . . . 0,7
Heating
Max. working pressure . . . . . . . . . . . . . . . . . . . . . .bar . . . . . . . . . . . . . . 3
Min. working pressure . . . . . . . . . . . . . . . . . . . . . . .bar . . . . . . . . . . . . . .0,8
Recommended working pressure . . . . . . . . . . . . . .bar . . . . . . . . . . . . . 1 - 2
Temperature range . . . . . . . . . . . . . . . . . . . . . . . . . °C . . . . . . . . . . . . 38 – 80
Expansion vessel . . . . . . . . . . . . . . . . . . . . . . . . . litre . . . . . . . . . . . . . . 5
Max. quantity of water in heating circuit . . . . . . . . litre . . . . . . . . . . . . . . 70
Max. pressure in expansion vessel . . . . . . . . . . . . .bar . . . . . . . . . . . . . . 3
Domestic hot water (DHW)
Max. input pressure . . . . . . . . . . . . . . . . . . . . . . . .bar . . . . . . . . . . . . . . 6
Min. input pressure . . . . . . . . . . . . . . . . . . . . . . . . .bar . . . . . . . . . . . . . . 1
Min. water flowrate . . . . . . . . . . . . . . . . . . . . . litre per min . . . . . . . . . .2.7
Adjustable temperature range . . . . . . . . . . . . . . . . °C . . . . . . . . . . . . 35 – 60
Flowrate at 25°C temperature increase . . . . . litre per min . . . . . . . . . 12.5
30°C temperature increase . . . . litre per min . . . . . . . . . 10.8
35°C temperature increase . . . . litre per min . . . . . . . . . .8.8
Electrical data
El. voltage / frequency . . . . . . . . . . . . . . . . . . . . . V/Hz . . . . . . . . . . .230 / 50
El. power input . . . . . . . . . . . . . . . . . . . . . . . . . . . . W . . . . . . . . . . . . . 135
El. protection class . . . . . . . . . . . . . . . . . . . . . . . . . IP . . . . . . . . . . . . . . 45
El. current . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A . . . . . . . . . . . . . . .0.6
Connections
Heating water in/out . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . G 3/4"
DHW in/out . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . G 1/2"
Gas . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . G 1/2"
Flue gas and air ducts
Flue duct / air inlet . . . . . . . . . . . . . . . . . . . . . . . . mm . . . . . . . . . 100/60 (80/80)
Max length of coaxial ducts 100/60 . . . . . . . . equivalent m . . . . . . . . . . 4
Max length of separate ducts 80/80 . . . . . . . . equivalent m . . . . . . . . . . 10
Flue gas temperature . . . . . . . . . . . . . . . . . . . . . . . °C . . . . . . . . . . . .115-145
Weight flowrate – flue gas . . . . . . . . . . . . . . . . . . .g/s . . . . . . . . . . . . . . 18
Dimensions
Height / Width / Depth . . . . . . . . . . . . . . . . . . . . . . mm . . . . . . . . . 740 /410 / 320
Weight . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . kg . . . . . . . . . . . . . . 37
1. manostat
1* chimney draft control system
(flue thermostat)
2. fan
2* draught damper
3. heat exchanger
4. burner
5. expansion vessel
6. pump
7. DHW flow rate sensor
8. water refilling valve
9. safety valve
10. CH inlet
11. DHW inlet
12. gas inlet
13. DHW outlet
14. CH outlet
15. drain valve
16. pressure sensor
17. backflow valve
18. By-pass
19. DHW temperature sensor
20. Gas valve
21. CH temperature sensor
22. overheat thermostat
fig. 7
Boiler schematic

14 15
1. CH outlet (outer thread G 3/4")
2. DHW outlet (outer thread G 1/2")
3. Gas in (outer thread G 1/2")
4. DHW inlet (outer thread G 1/2")
5. CH inlet (outer thread G 3/4")
6. Wall
7. Wall-fixing bracket
8. Casing
Dimensions and pressure available
fig. 8
Flow rate through heating system (l/h)
Available pressure (kPa) between heating supply and return (10 kPa = 1 m WG)
24 BTV/BOV is compatible with all
common types of heating water systems
and radiators.
24 BTV/BOV boiler can be put into opera-
tion only by an authorised installer in com-
pliance with valid regulations. A network
of the manufacturer’s contractual service
centres provides installation, maintenance
and repairs.
The boiler is designed for operation in a
normal environment (temperatures be-
tween +5 and +40°C, humidity up to 85%,
depending on the temperature).
The boiler is suitable for installations in
residential and social rooms as regards
the noise level.
The heating-circuit water must comply
with the relevant Standard (it must not be
acidic, i.e., its pH must be above 7, and
the carbonate hardness must be as low
as possible).
Use of anti-freeze mixtures is not recom-
mended, since they have properties unsuit-
able for boiler operation. These specifically
include: reduction of heat transmission to
the heating circuit, high thermal expan-
sion of volume, aging, deterioration of
rubber parts. Even if no other solution for
preventing the system from freezing has
been found, consequent failures to meet
the operational parameters and/or defects
caused by the use of the anti-freeze mix-
tures will not be covered by the warranty.
Prior to the final assembly, the heating-cir-
cuit pipes should be flushed by pressure
water, several times. For older circuits (that
have already been in use) the flushing
stream direction must be opposite to that
of the heating water.
Installation of a sludge separator is recom-
mended in the incoming branch of heating
water. The design of the separator should
enable regular removal of sludge without
necessity to discharge large quantities of
heating water. The sludge separator can
be combined with a filter; however, a filter
itself is not sufficient protection. Both the
filter and the separator should be regularly
checked and cleaned.
The relevant standards provide re-
quirements for the water quality: if the sum
of calcium and magnesium concentrations
is above 1.8 mmol/litre, other “non-chem-
ical” measures should be taken against
scaling (such as protection by magnetic or
electrostatic field).
The warranty does not cover mechanical
defects caused by foreign bodies and
impurities (e.g., a clogged exchanger or
pump).
Working temperature of the upper parts
of the boiler (especially the top and side
panels) may be up to 50°C higher than the
ambient temperature. The clearance from
flammable materials (such as chipboard,
polyurethane, polystyrene, polyethylene,
expanded PVC, synthetic fibre, cellulose,
asphalt board, rubber, etc.) must secure
temperature these materials under 80°C.
The minimum handling space around the
boiler should be such that easy and safe
work with bare hands and/or with tools be
possible.
Introduction
INSTALLATION INSTRUCTONS

16 17
For the 24 BTV flue-gas is removed and
combustion air is brought in by a special
double duct. Double-duct routes can be
completed from the standard parts sup-
plied by the manufacturer for virtually any
situation. The route must be designed to
enable removal of condensed flue vapours
out of the duct. Special condensate-dis-
charge elements can be used for that
purpose. If any defects are caused by the
condensation, they will not be covered by
the warranty. Due to the variability of local
conditions, the double duct elements are
not included in the delivery or in the boil-
er’s price. Principles for completion of the
routes – see. chapter “Air and flue ducts.”
For the 24 BOV flue-gas is removed by
means open chimney draught. Minimal
required chimney draught in steady stage
is 2 Pa. Connection to the chimney is via
a connecting flue pipe with diameter cor-
responding to flue outlet on the boiler (125
mm). Installation of both the boiler and the
connecting flue pipes with chimney must
comply with valid standards. The stand-
ard's requirements prevent appearance of
adversary effects, such as excessive cool-
ing of the flue gases, penetration of the
chimney wall by humidity, and variability
of chimney draught which would affect the
boiler operation in an undesirable manner.
The connecting flue pipes are not included
in the boiler delivery.
Caution: Elements reducing the chimney
draught (such as various exchangers for
using the residual heat) are prohibited
from being inserted in the connecting
flue pipe.
The 24 BOV takes combustion air from the
space around it. There must be possibility
of direct space ventilation and sufficient
combustion air supplies comply with valid
standards.
Delivery completeness
BTV /BOV boiler is delivered in assembled
state and functionally tested.
Delivery contains (see fig. 9):
1. Boiler
2. User and installation instruction
3. Service book
4. List of Service centres
5. Certificate of Warranty
6. Template
7.
Drawbar for hanging of boiler
Additional accessories
Following accessories can be ordered
according to various requirements;
1. Connecting set, supply number XXXX
(see fig. 10)
2. Flue gas and air ducts 100/60 for BTV
version e.g.:
- S5D-1000 Horizontal set (elbow with flan-
ge 90°, 1m horizontal terminal), supply
number 7194
- K1D Elbow 90°, supply number 2842
- T1D-1000 Extension 1m, supply number
2825
- S3 Vertical terminal, supply n. 2805
- Z1 Condensate retainer, supply n. 2857
3. Flue gas and air ducts 80/80 for BTV
version e.g.:
- S2 Air-flue duct set (separator, 2x elbow
90°, 2x 1m horizontal terminal) , supply
n. 2803
- K2A Elbow 90°, supply n.
- T2 Extension 1m, supply n. 2819
- S4 Vertical terminal, supply n. 2809
- Z2 Condensate retainer, suply n. 2858
Delivery contents
1
Záruční list
Seznam servisních
středisek
Servisní kniha
Návod k obsluze
a instalaci
2345
67
fig. 9
Connecting set
fig. 10
Connection set contain:
1x assembly platform
2x CH stop valve G 3/4" including gasket
2x Heating system connections - pipe
diameter 22 mm
2x DHW stop valve G 1/2" including
gasket
1x gas stop valve G 1/2" including gasket
1x template
1x drawbar for hanging of boiler
3x bolts including wall plug

18 19
Heating system
Rated diameters of pipes are determined
in the usual manner, depending on the
pump characteristic curve. The piping is
determined by the requirements for the
system in question, not by the boiler’s
maximum power output. Nevertheless, the
piping must provide for a 20°C temperature
difference between the incoming and
outgoing CH and the minimum flow rate
500 litres per hour.
The pipes’ layout must be such that no
bubbles form in the system and purging
is facilitated. Purging valves should be
situated at all high points of the system and
on each radiator. It is absolutely necessary
to flush the system before the new boiler
installation and remove impurities from
heating system.
The heating system’s hydraulic pressure
(measured at the boiler) should be at least
1 bar (corresponding to 10 m of water
column). The recommended pressure
range is from 1 to 2 bar. The expansion
vessel is suitable for max.70 litres of
heating water (for temperature 80°C).
Thermostatic valve heads can be used on
the radiators. If the boiler is controlled by
a room thermostat, the thermostatic valve
heads should not be installed in the room
where the room thermostat is.
The boiler may be connected to the heating
circuit by flexible elements (hoses) during
reconstructions, if necessary because of
the layout, etc. Such hoses must have
parameters suitable for the purpose,
should be as short as possible, protected
from damages caused by mechanical load
and chemical agents, and replacement
must always be arranged prior to the
end of the life-cycle and/or deterioration
of their parameters (according to their
manufacturer’s instructions).
Note: after connecting of boiler to heating
system remove plastic stoppers which are
placed in boiler outlets.
DHW system
The DHW pressure should be between 1
an 6 bars; if it is higher, a reduction valve
must be installed. In areas with very hard
water, suitable measures for softening
should be applied.
It is recommended to install CH, DHW
and gas stop valves on the pipes near
the boiler.
For easy connecting of boiler is used the
special connecting set with stop valves
(see Fig. 10).
Boiler installation Boiler hanging
The boiler is hung on the wall on two bolts,
with minimum diameter of 6 mm. Suitable
washers must be placed under the bolt
heads. The connecting fittings have outer
threads. All necessary distances are shown
in the figure of connecting dimensions
(fig.8).
Boiler connecting
It is recommended to install CH, DHW
and gas stop valves on the pipes near
the boiler.
The connection fittings on the boiler
must not be affected by any pressures or
forces from the piping – in other words,
all dimensions and distances of the
connected pipes must be accurate, both
mutually and from the wall and floor. For
this end is supplied special connecting set
(see Fig. 10).
On the hydraulic set at the boiler’s bottom,
the following elements are situated: safety
valve, relief valve and discharge valve.
The boiler should be connected to the
heating system such that it is possible to
discharge water only from the boiler if it is
necessary for repairs.
Boiler hanging
fig. 11

20 21
Boiler filling and draining
Water filling into / draining from the heating
system and the related steps (purging,
setting the expansion vessel) are not
covered by the warranty.
Small quantities of water can be refilled into
the boiler by the refilling valve.
The drain valve is designed to reduce water
pressure in the boiler before repairs. Only
partial discharge of water from the boiler
can be achieved via the drain valve.
Filling/draining valves should be installed at
suitable points of the system for complete
discharge of water from the boiler or the
entire heating system.
Basic conditions and procedure of filling
and draining are described in User
instructions. In additional must be open the
little cap on deaerating valve (on pump),
checked pressure in expansion vessel and
deaerated whole heating system.
Safety valve
On the hydraulic set at the boiler’s bottom
is situated safety valve (see fig. 13), The
safety valve outlet may release hot water
or steam (if the safety pressure limit is ex-
ceeded).
Gas connection
The 24 BTV/BOV - G20 model is designed
for natural gas, with 2.0 kPa rated pressure
in the network and the calorific value of 9
to 10 kWh/m3. The internal gas piping and
the gas meter must be dimensioned for
all gas appliances of the respective user.
The boiler’s connection branch’s rated
inner diameter should be at least DN
1/2", but one degree higher (DN 3/4") is
recommended.
The 24 BTV/BOV - G30 model is designed
for LPG, whose calorific value is between
12.3 and 13.0 kWh per kg. Operation using
portable cylinders would be problematic,
due to both sufficient volume and handling
of the cylinders; hence a prerequisite for
the operation is installation of an LPG tank
near the heated premises and filling of the
tank by an organisation authorised for such
activities.
Sufficient supply of LPG from the tank to
the boiler (and other gas appliances, if any)
is part of the design and delivery of the
LPG tank . For LPG boilers, a pressure-
control (reduction) valve should provide the
pressure of exactly 3.7 kPa (37 mbar).
Gas piping in buildings must fulfill the valid
requirements.
Note: for connecting of gas valve must
be always used union nut and gasket
directly placed on gas valve !!!.
Drain valve Safety valve
fig. 12 fig. 13
Boiler template
fig. 14

22 23
For 24 BTV, the air input and flue gas
output goes through a special double
duct. The sufficient distance must be
ensured betveen the flue gas duct and
the flammable materials to prevent the
increasing temperature of these materials
over 80°C.Horizontal segments of the duct
are laid with a slope, so that condensate
flows into an opening to the outside (or to
special condensate discharge elements).
it is possible to slightly deviate from the
direction at the elbow-to-straight-piece
connection. Vertical segments of the flue
duct must always be equipped with special
condensate discharge elements.
Maximum length and kinds of flue
design
The maximum length of a concentric and
separate double duct route is in table.
Warning: if the length of the contrentric
double duct is more than 2 Em (separate
ducts more than 4 Em), the flue diffuser
must be taken out of the fan mouth.
Flue gas and air ducts
obr. 15
Em
obr. 16
∅80
∅80
L2
L1
Em
obr. 17
obr. 18
flue duct diameter min. length max. length with
diffusor
max. length wi-
thout diffusor
100 / 60 1,5 Em 2 Em 4 Em
80 / 80 2 Em 6 Em 18 Em
C52 Design
C32 Design
C12 Design
Diffusor
The most frequent kinds of flue design are
illustrated on fig. 16, 17 and 18. The boiler
24 BTV can be used for next following
designs:
• C42 design - connecting to common
chimney
• C62 design - connecting to separately
approved and sold ducts.
• C82 design - air duct leads combustion air
from outdoor environment and flue gas duct
are connected to chimney.
External vent of horizontal ducts on
the façade should be at least:
• 2 m above ground level at publicly
accessible places (0.4 m at other places);
• 0.5 m from sides of windows and other
ventilation openings (grilles) or doors;
• above the top edge of windows, grilles
and doors;
• 1 m below window level, never below
grilles;
• at depth of R (see Fig.19) below
overhanging parts (e.g., roofs, balconies).
Minimum span between external vents:
• 1 m horizontal
• 2 m vertical
The external vent should always be
oriented to the open space (not to doors,
windows or grilles). If this requirement
cannot be met, the minimum distances
must be preserved as follows:
a) opposite – between the façade with the
external vent and a façade parallel to it:
• 2 m – if the opposite façade has no windows
or grilles;
• 1 m – if neither façade has any windows
or grilles in it;
• 4 m – if there are windows or grilles (or
external vents) in both façades
b) in corners – between the external vent axis
and the façade parallel to it:
• 2 m – if there are any windows, grilles or
doors in the façade;
• 0.5 m – if there are none.
• Corners smaller than 0.5 m are ignored.
All the distances are understood from the
external vent axis to the outer edge of the
respective window, grille or door.
Special instances
The external vent may also be closer
below an overhanging part, provided it is
equipped with a protruding part of the duct,
whose length at least reaches to the circle
of radius “R” – see. fig 19. .
External vent into a shaft leading to the
open space is possible, if the cross-section
area of the shaft is at least 1.25 m2along
its length and there are no doors, windows,
grilles or other flue ducts into the shaft
Vertical external vent – to the roof
Roof vents must be at least 0.4 m from
each other and from air-conditioning
outlets/intakes. Its protruding part must
reach above a snow layer 40 cm thick (if it
were lying on the roof).
Safety precautions
Flue ducts must not be vented into
spaces:
• with a risk of explosion;
• internal (attic, corridor, stairwell, etc.);
• that can be closed, such as passages,
etc.
• below ground level (even if open) such as
tunnels, subways, etc.
If an air intake is separately installed, its
location must be assessed similar to the
above rules.
The opening for the duct passage through
a wall should be bored with sufficient extra
clearance (approx. 120 to 150 mm) and the
duct must be sealed inside of it the sealing
flameproof materials – such as mortar,
gypsum, etc. Passages through walls or
ceilings made of flammable materials must
comply with the valid standard.

24 25
Overhanging parts
Installation in a façade
External vents - Illustration
Corners
fig. 19
2m - in public places
0,4m - in other places
- zone where external vents
can be instaled
Standard set
Coaxial
elbow 90°
Coaxial duct
Standard set
A Outside casing – air part
B Inside casing – flue gas part
C Collar and clip
D Elbow with flange
E Sealing
F Bolts
G Outer sealing ring (rubber)
I Inner sealing ring (plastic)
J O-ring
• Apply the seal (E) to the bottom part of
the elbow (D);
• Carefully insert the O-rings (J) into the
upper and lower parts inside the elbow;
• Attach the elbow to the boiler – be careful
to connect the inside part to the boiler’s
outlet properly;
• Put the rubber sealing ring (G) on the air
duct (A);
• Push the completed duct section through
the wall opening so that the (G) ring is
aligned with the outside surface of the
wall;
• Place the collar and clip onto the duct and
elbow; check proper sealing of both inside
and outside sections of the duct;
Note: The maximum horizontal length is 1
elbow plus 3 m (4 equivalent metres) – if
the horizontal route’s equivalent length is
more than 2 m, the diffuser (R) must be
removed from the fan (see Fig. 15 ).
• Secure the elbow’s flange using the
bolts;
Note: If you have to shorten the straight
part, always cut the same length from
both the outside and inside elements.
Always cut at the end opposite to the
external vent.
Example accessories:
Horizontal set 1 m
Horizontal set 0.75 m
Coaxial extension duct (1 m)
Coaxial elbow 90°
Example of horizontal double-duct flue
fig. 20
Horizontal flue - Illustration

26 27
Example of a vertical duct route
• Apply the seal to the coaxial vertical
adaptor (O);
• Carefully insert the O- ring (J) into the
inside part of the vertical adaptor;
• Put the vertical adaptor on the boiler’s and
fan’s outlets;
• Insert the coaxial extension (M) into the
vertical adaptor;
• For passage through the roof cover,
use either special roof tiles (so-called
“ventilation tiles”) or a roof flashing
custom-made by a tinsmith;
• The coaxial extension duct protruding
above the roof should be terminated with
a coaxial (“Meindinger”) head. Instead of
the extension duct and head, a vertical
terminal (L) is better to use as the nicer
top part.
• Attach a condensate-drainage part (tube,
hose, etc. – not included in the delivery)
to the condensate outlet of the vertical
adaptor;
Example accessories:
Coaxial vertical element (O)
Coaxial extension duct (1 m) (M)
Vertical terminal (L)
Example of a vertical double-duct flue
Vertical flue - Illustration
fig. 21
Vertical terminal (L)
Extension duct (M)
Vertical adaptor (O)
Vertical adaptor (O)
Boiler
O-Ring (J)
Groove
Electrical connection of the boiler to the
power grid is by three-wire cord without
plug. The socket for the plug must comply
with the relevant standard and have the
grounding pin connected to a PE or PEN
cable (yellow-green).
The boiler must be connected to the
protective grounding wire; the electrical
plug in the socket must always be
accessible without obstacles. Use of
adaptor plugs, extension cords, etc. is
prohibited. The boiler is protected by tube
fuse 125 mA/250V placed on PCB.
Only a person with adequate electrical-
engineering qualifications can be allowed
to install the socket and the thermostat
(thermostat installation requires utilization
of the boiler’s internal electric cabling); the
same requirements apply to servicing the
electric part. Before any work commences
on the electrical part, the boiler’s cord must
be unplugged.
Only no-voltage thermostats or regulators
can be used for regulating the boiler, i.e.,
they must not bring in any foreign voltage.
The minimum requirements for the
regulator’s contacts: 24 V / 0.1 A, A.C.
The room thermostat is connected to the
boiler with a two-wire cable, with copper
wires of a recommended cross-section
between 0.5 and 1.5 mm2
The connecting cables of the room
thermostat should not be led parallel to
other cables or through premises with high-
power electric motors (or electric welding
machines., etc.)
The terminal board for connections of the
room thermostat is inside the boiler, on
the bottom. It is accessible after removing
the front cover panel and tilting the control
panel out.
Electrical part
Electrical connection
fig. 22
Three wire
cord
Boiler
Mains lead (supplied) Externals controls lead (not supplied)
Room thermostat
ONLY remove this link
when connecting to an
external room thermostat

28 29
24 BTV - Electrical diagram
fig. 23
24 BOV - Electrical diagram
fig. 24

30
Conversion to LPG
Boiler 24 BTV/BOV is standardly supplied
in the version for the combustion of natural
gas. If the combustion LPG is required, it
is necessary replace gas valve and burner
platform and then set the boiler to specified
parameters. Conversion must only be car-
ried out by a competent person, authorised
by the manufacturer. Gas valve and burner
platform are part of Conversion set.This set
contains all needful parts and Instructions
for conversion.

Leopard
User and Installation
Instructions
24 BTV / v.17
24 BOV / v.17
XXXX
Wallhung gas boiler
DHW preparation
Power 9 - 24kW

XXXX
Wallhung gas boiler
User and Installation Instructions