Protherm Leopard 24 BTV Operating instructions

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

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
workshops, offices, 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

3
• 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
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

5
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 sym-
bol lights continuous-
ly. DHW temperature co-
rresponds with required
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 display-
ed 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 sys-
tem to pressure 1- 2 Bar
soon.

6
Equithermal mode - curve slope
Press the button -
letter E with the characters
(0) through to (9) attached
will appear on the display.
By pressing the but-
tons, select the required
equithermal curve. The cur-
ve´s slope grows with the growing number
(E0 < E9) - see fig. 3.
By pressing the .button, the selecti-
on is saved in the memory.
Note: Equithermal control requires an ex-
ternal sensor to be connected to the boi-
ler, which must not be set to the SUMMER
mode.
Attention: Boiler does heating with maxi-
mal power on one hour after installation of
the outdoor sensor. All settings are igno-
red in this time except room thermostat (if
is connected).
Equithermal mode – paralel curve
shift
If previous parameter E
was confirmed by pres-
sing the button
- letter P with the chara-
cters (0) through to (9)
attached will apear on
display. By pressing the
buttons, select the required shift
(see fig. 3, table 1). For beginning setting
choose the parameter P5, which respond
to outdoor temperature 15 °C (see table
1, fig. 3).
Note: If boiler reaches the reference tem-
perature, then heats system by minimal
temperature (38 °C) till outdoor tempe-
rature increase at 3 °C, then is heating
switched-off (see table 1 - switch-off tem-
perature).
fig. 3
Equithermal curves
„P“ parameter 0 1 2 3 4 5 6 7 8 9
Reference temp. °C 6 7 9 11131517192123
Switch-off temp. °C 9 10 12 14 16 18 20 22 24 26
Table 1

7
Operation diagram

8
No flame - F1
Boiler is switched off, for
example by reason of gas
supply failure. LED 4 un-
der symbol flash. Bo-
iler can be restarted by
switching off and on (
from
position „I” to position „0“ and again to po-
sition „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 automati-
cally 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
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 set-
ting). Let check the boiler setting by ser-
vice centre occasionally.
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” posi-
tion (“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
Boiler Start and Switch-Off
( 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 oper-
ated 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 dis-
connect 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.

9
Setting SUMMER mode (only DHW)
• Start the boiler;
• Select “– –” for CH temperature as de-
scribed under Control and Signalling (CH
temperature setting);
• Activate the basic state by MODE button.
Operation without a room thermo-
stat
Boiler keeps CH temperature on setting
value. The room thermostat is not con-
nected; its contacts must be interconnected
(by utilizing a jumper).
• Set the desired temperature value as de-
scribed 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.
Running the Boiler with Equithermal
Control
The boiler changes heating water (HeW)
temperature according to the changing
outdoor temperature.
Important: The boiler must have an out-
door temperature sensor connected! The
outdoor temperature sensor is installed
on the coldest wall of the building (nor-
th of north-west), about 2.5 – 3 m above
ground. The sensor must not be exposed
to any external sources of heat such as
open windows or ventilation shafts or sun-
shine.
When selecting a heating curve, a rule
applies that curves of a lower number are
suitable for buildings with good thermal
insulation and steeper thermal gradient,
and vice versa.
The heating curve diagram provided is
used as a primary guideline. More accu-
rate setting is achieved by monitoring both
outdoor and indoor temperatures for se-
veral days.
In the first setting select the E5 curve.
When doing the setting, all radiator valves
must be completely opened, thermostatic
valves must be set to maximum tempe-
rature and doors and windows must be
closed.
Change the curve gradient or reference
temperature in small steps, and after each
new setting wait about 2 hours and then
assess the change. When trying to find
the right setting, it is better to do so when
the outdoor temperature fluctuations are
greater, and the final setting should be
done when the outdoor temperature is be-
low the freezing point.
The boiler is set in the following procedu-
re: 1. Select the “HeW temperature” mode
and make sure that the function “SUM-
MER” is not activated. (symbol --). Set the
temperature to a concrete value (it will
have no effect on the equithermal mode).
2. Select “Equithermal mode – curve gra-
dient” and set it to symbol E5 – see page
7.
3. Select “Equithermal mode –reference
temperature shift “ and set it to (P5). 4. Put
the boiler into the ready state. After seve-
ral days of operation (when the premises
have been heated up), change the curve
gradient as necessary.
5. If the indoor temperature does not no-
ticeably change with a changing outdoor
temperature, the selected curve is the co-
rrect one. The temperature can be set to
Boiler Regulation
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

10
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 use-
ful 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 ther-
mostat 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 (continu-
ously 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
Protective features of the boiler
a higher or a lower value by shifting the
reference temperature – see the section
“Controls and signals – equithermal mode
– reference temperature shift”.
Please note: If with a decreasing outdoor
temperature the indoor temperature noti-
ceably increases, select a heating curve
of a lower number, and if it decreases,
with a higher number.
Running the Boiler with Equithermal
Control and Room Control Unit
The room control units augments the equi-
thermal control, allowing time setting and
economy heating mode (e.g. at night).
How to set the boiler: • set the equithermal
control as explained above;
• connect the room control unit to the boi-
ler (remove the terminal jumper) and then
set the required temperature during the
comfort period on the control unit to a va-
lue about 5°C higher then the temperature
reached with equithermal control. Set the
required temperature during the economy
period (at night, when absent) on the con-
trol unit to the actually required value – it
must always be at least 3°C lower than
the actual comfort temperature.
Please note: Room control unit must be
installed by a specialist service organisa-
tion.
Example: Select curve E5. With the out-
door temperature -10°C, the boiler sup-
plies water to the heating system of about
70°C. If you at the same time select the
P5 reference temperature shift parame-
ter, when the outdoor temperature rises
by 15°C, the boiler should supply water
to the heating system of 38°C. When the
outdoor temperature rises to 18°C, the
heating water heating is turned off.
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.

11
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 boil-
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 electric-
ity 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.
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 con-
tuniously.
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 ver-
sion 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“.
er (to 30°C) is in range from 1 to 2 bar.
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.

12
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 sys-
tem:
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 Instal-
lation 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

13
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

14
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

15
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

16
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)

17
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

18
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

19
Delivery contents
1
Záruční list
Seznam servisních
středisek
Servisní kniha
Návod k obsluze
a instalaci
2
3
4
5
6
7
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