Devex X Boiler BD Series User manual

Instruction Manual
Installation, Operation and Maintenance
X Boiler BD Series
BD 23, BD 38
Gas-fired condensing central heating boilers

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Dear Customer,
Congratulations on choosing the X Boiler BD series.
We are pleased to offer you a modern economical and environmentally friendly product that meets our particular high Australian
standard requirements. Please read this instruction manual carefully as the following instruction manual will explain in detail the
manufacturer’s recommendation for a reliable, efcient and safe operation of your boiler. We would also urge you to keep this
instruction manual for the operational life of the boiler.
We hope that your new X Boiler meets your expectations.
IMPORTANT INFORMATION
• Read this instruction manual carefully before you install and operate the boiler.
• The instruction manual is an integral part of the boiler and should be kept throughout the operational life of the boiler. It
contains all the warnings and important information to be adhered to for safety during installation, use, and maintenance.
• Reliable and efcient operation of the boiler depends to a large extent on the appropriate performance of systems that the
boiler is connected to such as:
• gas system
• ue gas-air system
• central heating system
• domestic hot water system
• Flue gas-air installations for C type boilers should be made of approved gas-air systems. Adaptors connecting the boiler
with a pipe system must have measuring points. The ue gas-air system must meet the specications set out in section 3.8
of this manual.
• Flue gas-air system connections must be tight. Leaks from the ue gas pipes can result in ooding of the boiler by
condensate. The manufacturer is not liable for damages or malfunctions resulting from a ooded boiler.
• Installation of the boiler should be performed only by a qualied person*, to all specications in this manual, the
requirements of AS/NZS 5601.1 and the local authority-gas or electricity etc. Make sure the installer conrms in writing
that the tightness of the gas installation has been checked and approved after connecting the boiler to the system.
• The boiler may be installed and operated only in a room where all building works have been completed. Building works are
potential sources of dust, debris, and harsh solvents or vapours which have a negative effect on the boiler’s lifespan.
• The cleanliness of air in a room where the boiler will be installed must meet the same requirements as for rooms designed
for people.
• Install appropriate lters in the central heating system (C.H.) and gas system. Filters are not included as part of the basic
boiler equipment.
• All defects caused by inadequate ltering in the central heating or gas supply will not be repaired under warranty.
• The process of connecting the boiler to a water heating system is discussed in Section 3.5
• The central heating system must be thoroughly cleaned and rinsed before installation. The procedure is described in section
3.5.2.
• To avoid malicious calcication of the ue gas - water heat exchanger and also to reduce the risk of other components
being damaged:
• water used in the Central Heating (C.H.) circuit should be prepared properly according to section 3.5.2. Using the
correct water parameters of the C.H. system will promote the long-term operation of the boiler, while maintaining its
high efciency, leading to reduced gas consumption and lower costs,
• all connections in the central heating system should be tightened properly
• Issues caused by gas-water heat exchanger calcication will not be repaired under guarantee.
• The initial start-up of the boiler as well as its repairs, adjustments, and maintenance, must be performed only by an
AUTHORISED SERVICE COMPANY.
• Do not perform any repairs or modications to the boiler by yourself.
* Qualied person’ - a person that has all the required technical qualications to perform according to local regulations, the work necessary in connecting appliances to
the gas mains, central heating system, and ue gas duct.

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• A boiler is a complicated appliance as it contains numerous precise mechanisms. The boiler must be operated only by an
adult.
• Do not cover any ventilation grills.
• DO NOT USE OR STORE FLAMMABLE, AGGRESSIVE AND CORROSIVE MATERIALS OR OTHER SIMILAR SUBSTANCES
IN OR NEAR THIS APPLIANCE.
• Any failures that are the result of operation discordant to recommendations included in this instruction manual cannot be
subject to warranty claims.
• The manufacturer is not responsible for any failures resulting from faulty installation and non-observance of regulations
and instructions given by the manufacturer.
• Complying with recommendations given in this instruction manual will ensure a long, reliable and safe operation of the
boiler.
• This appliance is unsuitable for use as a pool heater.
• DO NOT SPRAY AEROSOLS IN THE VICINITY OF THIS APPLIANCE WHILE IT IS IN OPERATION.
• DO NOT PLACE ARTICLES ON OR AGAINST THIS APPLIANCE.
• DO NOT MODIFY THIS APPLIANCE.
When you smell gas:
• do not use any electrical switches that could cause a spark,
• shut down the main gas valve,
• open doors and windows,
• immediately contact your gas supplier.
In case of any failure you should:
• disconnect the boiler from the power source,
• turn off the gas supply valve,
• cut off the water supply and drain the water from the boiler (in case of leakage that could cause the boiler to ood) and
the whole central heating system (especially when there is any risk of freezing the system),
• contact the nearest AUTHORISED SERVICE COMPANY or the manufacturer.

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WARNING!
Read this instruction manual carefully.
This manual is intended to guide the installation, maintenance, and operation of the X Boiler BD Series.
Failure to adhere to these guidelines can result in severe personal injury or substantial damage to property.
The manufacturer cannot accept responsibility for any damages and losses resulting from:
• incorrect installation of the boiler
• technical modications to the boiler beyond the scope of instructions found in this manual
• incorrect use of the boiler or work done by an unqualied person
Fig. 1
Fig. 2
Fig. 3
INSTRUCTIONS FOR FILLING THE BOILER WITH WATER
These instructions should be followed before the start up of the condensing boiler connected to a
Central Heating System (C.H.)
1. Fill the heating circuit with water and vent the radiators before start up.
2. Check that the connection of the electrical cord to the boiler is correct (network 23V/50 Hz)
L – brown; N – blue; PE – yellow/green.
Do not swap the L & N cords! If the L & N cords are changed, the boiler will enter failure
mode and the error code E01 will be displayed.
3. Close the gas cut-off valve!
4. Open valves which cut-off the boiler from the C.H. circuit.
5. Remove the front cover of the boiler by unscrewing the relevant xing screws (Fig. 1).
6. Remove the front cover of the combustion chamber (Fig. 2).
7. Loosen the stopper on the automatic air-vent of the pump. In order to protect the pressure
transducer from water, point the outlet of the stopper to the right (Fig. 3).
8. Turn on the boiler. Wait until the start up procedure ends (during that time, the boiler is
testing the internal assembly and the ventilation system), this takes about 10-30 seconds.
9. Fill the boiler with water by using the lling valve mounted on the C.H installation. It is
important to open the lling valve slowly to protect the boiler and the components of the
C.H. system against hydraulic shock.
10. While lling the boiler with water, check and control the pressure using
the analogue pressure gauge on the boiler’s front cover, or the electronic
manometer on the controller display (depending on the boiler’s type).
Shut off the lling valve after reaching a pressure of 1.0-1.5 bar.
Note: in some boiler models, at the end of the start up procedure, the
“support the venting of boiler” function starts. This function is signalised on
the controller display by “Po” and lasts 3 minutes. The “support the venting”
function requires the water pressure to be above 0.5 bar, therefore, it is best to
maintain the water pressure in the boiler in the range 1.0-1.5 bar.
11. Set the operating mode to WINTER according to the boiler instruction.
If the boiler controller has been connected to the room thermostat, then
increase the desired temperature; the boiler should start operating in
C.H. mode.
12. Because the gas valve outside the boiler is closed, the boiler will stop
operating (E01 error code – a lack of gas). The pump will continue to
operate, removing air owing in with water from the installation and
providing continuous water ow through the heat exchanger. Leave the
boiler in this state for 2-3 min.

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* Depending on the size of the C.H. circuit, the time required to ll the boiler with water can be different. It is recommended to ll the C.H. installation with water
beforehand.
** In residential C.H. circuits, the nominal operating pressure should be set between 1.2-1.6 bar.
*** Note! The X Boiler is factory set for operating with underoor heating. For use with radiator heating,, the boiler control system will be adopted to other operating
parameters. This action is performed by an Authorised Service Company.
13. Remove E01 error code by using the “reset” button and set the boiler controller on pressure reading mode (in the version
without an analogue manometer). During the rst days of a boiler’s operation, it is recommended to set the water pressure in
the C.H. circuit between 1.8 – 2.0 bar. This will facilitate the work of the air-vent on the boiler pump and on the components
of the C.H. circuit. **
14. Unscrew the gas valve and delete the E01 code again.
15. Set the desired operating parameters of the boiler according to the instruction manual. ***
16. Check the water pressure in the C.H. circuit and if necessary, ll the pressure up to the right level.

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1. INTRODUCTION...................................................................................................................................................................................................................................7
2. BOILER DESCRIPTION ......................................................................................................................................................................................................................7
2.1 TECHNICAL SPECIFICATION...............................................................................................................................................................................................7
2.2 COMPONENTS OF THE BOILER ........................................................................................................................................................................................7
2.1.1 Main units of the boiler ...........................................................................................................................................................................................................9
2.2.2 Technical data................................................................................................................................................................................................................ 10
2.3 EQUIPMENT PROTECTION............................................................................................................................................................................................... 10
2.4 OPERATION DESCRIPTION............................................................................................................................................................................................... 10
2.4.1 Way of heating the water for central heating system ................................................................................................................................... 10
2.4.2 Temperature regulation dependent on external temperature .................................................................................................................. 11
2.4.3 The way of heating the water in system X BOILER cooperating with domestic water tank.......................................................... 11
2.4.4 Operation of the pump with adjustable speed.................................................................................................................................................. 12
3. BOILER INSTALLATION ................................................................................................................................................................................................................. 14
3.1 REQUIREMENTS OF BOILER INSTALLATION........................................................................................................................................................... 14
3.1.1 The regulations on the water installation, gas and the ue gas system ................................................................................................. 14
3.1.2 Regulations related to the room ............................................................................................................................................................................ 14
3.1.3 Requirements for electrical installation ............................................................................................................................................................. 14
3.2 PRELIMINARY CHECK ACTIVITIES................................................................................................................................................................................ 15
3.3 MOUNTING THE BOILER ON THE WALL.................................................................................................................................................................... 15
Fig. 3.3.1 Installation dimensions of X BOILER.......................................................................................................................................................... 15
3.4 MOUNTING THE OUTDOOR CASING.......................................................................................................................................................................... 16
3.5 CONNECTION TO THE GAS INSTALLATION............................................................................................................................................................. 16
3.6 CONNECTION OF THE BOILER TO A WATER SYSTEM OF CENTRAL HEATING ..................................................................................... 18
Fig. 3.6.1 Boiler installation requirements.................................................................................................................................................................... 18
3.6.2 System cleaning and water treatment for the C.H. lling .......................................................................................................................... 19
3.7 CONNECTION OF THE BOILER TO A DOMESTIC HOT WATER SYSTEM.................................................................................................... 19
3.8 CONDENSATE OUTLET ....................................................................................................................................................................................................... 19
3.9 FLUE GAS OUTLET................................................................................................................................................................................................................. 19
3.9.1 Horizontal outlet of air-ue system through the wall or on the roof...................................................................................................... 20
3.9.2 Vertical outlet of air-ue gas system through the roof................................................................................................................................. 21
3.9.3 Reduction of the maximum length of the air-ue system by changing the ow direction....................................................................... 21
3.10 CONNECTION OF ADDITIONAL DEVICES ................................................................................................................................................................ 21
Fig. 3.10.1 Electrical terminals of controller - a back view...................................................................................................................................... 21
3.10.2 Connection of a room temperature regulator ............................................................................................................................................. 22
3.10.2.2 Connecting the outside temperature sensor ............................................................................................................................................. 22
4. BOILER ADJUSTMENT AND PRELIMINARY SETTING .................................................................................................................................................. 22
4.1 INTRODUCTORY REMARKS ............................................................................................................................................................................................. 22
4.2 ADJUSTING THE BOILER TO COMBUST ANOTHER TYPE OF GAS................................................................................................................ 22
4.3 BOILER ADJUSTMENT......................................................................................................................................................................................................... 23
4.3.1 Gas ow regulation in the boiler (without using the ue gas analyser) ................................................................................................. 23
4.3.2 Adjustment of the boiler with a gas analyser.................................................................................................................................................... 24
4.4 FAN CHARACTERISTICS ..................................................................................................................................................................................................... 24
Fig. 4.4.1 Characteristics of the fan-type NG40M..................................................................................................................................................... 24
5. START UP AND OPERATION OF THE X BOILER ............................................................................................................................................................... 24
5.1 INITIAL START UP OF THE X BOILER ............................................................................................................................................................................ 24
5.2 OPERATION OF THE X BOILER........................................................................................................................................................................................ 24
5.3 OPERATING MODES OF THE CONTROLLER............................................................................................................................................................ 26
5.4 BOILER ADJUSTMENT......................................................................................................................................................................................................... 26
5.4.1 Signalisation of the start of heating in CH or DHW system ....................................................................................................................... 27
5.4.2 Signalisation of anti-freezing function operation in STAND BY mode................................................................................................... 27
5.4.3 Displaying the water pressure in CH Installation........................................................................................................................................... 27
5.4.4 Displaying parameters............................................................................................................................................................................................... 27
5.4.5 DHW heating blockade indicator for one-function boilers........................................................................................................................ 27
5.4.6 Support the venting of heating system ............................................................................................................................................................... 27
5.5 CHANGING THE CH OR DHW TEMPERATURE SETTINGS................................................................................................................................. 27
5.5.1 Temperature settings in CH circuit........................................................................................................................................................................ 27
5.5.2 Temperature settings in DHW circuit................................................................................................................................................................... 28
5.6 CONTROLLER CONFIGURATION - BOILER PARAMETERS SETTING ........................................................................................................... 28
5.6.1 Programming Mode entering.................................................................................................................................................................................. 30
5.7 PAUSE IN BOILER OPERATION........................................................................................................................................................................................ 30
5.8 DIAGNOSIS................................................................................................................................................................................................................................30
5.8.1 Signalisation of error codes during the emergency procedures implementation ........................................................................................30
5.8.2 Signalisation of error codes in emergency situations without locking................................................................................................... 30
5.8.3 Signalisation of emergency switching off with locking ................................................................................................................................. 30
5.8.4 Error list........................................................................................................................................................................................................................... 30
6. MAINTENANCE, INSPECTIONS, CHECKING OF THE OPERATION......................................................................................................................... 32
6.1 INSPECTION AND MAINTENANCE............................................................................................................................................................................... 32
6.1.1 Maintenance of the combustion chamber, burner, electrode.................................................................................................................... 32
6.1.2 Cleaning the condensate siphon............................................................................................................................................................................ 32
6.1.3 The pressure in the expansion vessel................................................................................................................................................................... 33
6.1.4 Maintenance of the ue-water heat exchanger, item 21 ............................................................................................................................. 33
6.1.5 Checking the temperature sensors....................................................................................................................................................................... 33
6.1.6 Checking the water pump operations.................................................................................................................................................................. 33
6.1.7 Ionisation current measurement........................................................................................................................................................................... 34
6.2 REPLACING A DAMAGED CONTROL BOARD IN THE CONTROL PANEL................................................................................................... 34
6.3 THE MAINTENANCE OPERATIONS TO BE PERFORMED BY THE USER ..................................................................................................... 35
6.4 RANGE OF TECHNICAL MAINTENANCE PERFORMED BY SERVICE COMPANY................................................................................... 36
7. BOILER EQUIPMENT....................................................................................................................................................................................................................... 36

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1. INTRODUCTION
The X Boiler BD Series is a condensing gas-red boiler designed for the central heating (C.H.) of residential buildings and
for heating domestic hot water (DHW). Condensing boilers are more efcient, using less fuel (contributing to lower running
costs) than non-condensing boilers. Their increased efciency means less carbon dioxide is emitted, making them better for
the environment compared to their noncondensing counterparts.
The X Boiler BD Series comes in two types: X Boiler BD 23 and X Boiler BD 38. These boilers can be adapted for use with a
storage tank by an AUTHORISED SERVICE COMPANY.
In C-TYPE installations, the combustion circuit of the boiler is sealed. That is, the boiler is set up to take air needed for
combustion from outside the building. Installations that take the air for combustion from inside the room where the boiler
is installed must meet the stringent conditions required by law. For further information about installations see section 3.8
and PN-EN 15502-2-1: 2013-04.
2. BOILER DESCRIPTION
The X Boiler BD Series with its components labelled is illustrated in Fig. 2.2.1.2 and Fig. 2.2.1.3. Below are the technical
specications of the boiler:
2.1 TECHNICAL SPECIFICATIONS OF THE BOILER
• Electronic uent ame modulation for the central heating system and domestic hot water;
• Electronic ignition with ionisation ame control;
• Adjustable boiler power;
• Regulation of heating water and domestic water temp.;
• Soft ignition function;
• Inlet gas pressure stabilisation;
• Adopted to connect with a closed circuit C.H. system;
2.2. COMPONENTS OF THE BOILER AS ILLUSTRATED IN FIG. 2.2.1.2 AND FIG. 2.2.1.3
5. Fan
7. Pump
8. Gas unit
10. Flame control/ Ignition
electrode,
11. Burner
12. 3-way valve
13. Flue gas-water heat
exchanger
15. Temperature limiter as
a protection against
exceeding the water
temperature upper limit
16. Thermal fuse of ue gas
17. Expansion vessel
18. NTC sensor of heating
water supply
19. Heating water pressure
transducer
20. Air -vent
21. Plate water-water heat
exchanger
22. Filling valve of installation
25. Safety valve - 3 bar
26. Domestic water ow sensor
27. NTC sensor of domestic
water temperature
28. NTC temperature sensor of
heating water - return (only
in boilers with PWM pumps)
29. Siphon
30. Mixing unit
33. Drain valve
Fig. 2.2.1.2. Location of elements in system boiler: X BOILER BD Series

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1. The boiler is tted with a control panel (illustrated in Fig. 2.2.1.3) possessing a display that continuously provides information
on the operating status of the boiler. The system’s parameters, e.g., temperature set points are easy to adjust and congure.
Any operational problems are immediately signalled by the display and, in certain cases will be corrected automatically.
1 Boiler function selection button/switch
2 Temperature selector (C.H. or DHW)
3 Heating water, domestic water, and static
pressure and temperature display with error
codes diagnostic
4 Control panel Kt.
K1 ON/OFF, reset
A Central heating system and a storage tank
supply
B Domestic cold water
C Gas
D Domestic hot water
E Return from central heating system and
from a storage tank
Fig .2.2.1.3. Scheme of boiler operation
for Australia and New Zealand please refer to settings in Table 4.3.2.1 on p21

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Parameter Unit
X BOILER BD
23 38
Energetic Parameters
Boiler thermal power at 80/60ºC (modulated)(natural gas) kW 3.1 ÷ 23.0 4.5 ÷ 38.0
Boiler thermal power at 50/30ºC (modulated) (natural gas) kW 3.2 ÷ 25.3 5.0 ÷ 41.8
Boiler thermal power at 80/60ºC (modulated)(LPG) kW 3.4 ÷ 25.8 4.5 ÷ 38.0
Boiler thermal power at 50/30ºC (modulated) (LPG) kW 3.7 ÷ 28.4 5.0 ÷ 41.8
The efciency of the boiler at nominal load and average boiler
water temp. 70ºC % 97.6 98.0
The efciency of the boiler at partial load and return water
temperature 30ºC %107.9 109.0
Modulation range %13-100 12-100
Seasonal space heating energy efciency ɳ s%94 94
Seasonal space heating energy efciency class A
Nominal Gas consumption:
natural:
2E-G20
liquid:
ULPG
MJ/ h 94
106.0
157.5
157.5
Nominal kinetic pressure in front of the boiler for gas:
2E-G20
ULPG
Pa (mbar) 2000 (20); 2500 (25); 2000 (20); 1300 (13); 1130 (11,3)
2800 ÷ 3000 (28 30); 3000 (30); 3700 (37); 5000 (50)
Maximum water pressure MPa (bar) 0,3 (3)
Max temperature (central heating) ºC 95
Standard adjustable temperature
Reduced adjustable temperature ºC 40 ÷ 80 25 ÷ 55
Lift of the pump at ow 0 kPa (bar) 95
Parameters of ue gas
Fan characteristics section 4.4 of this manual
Flue gas mass ow at full load kg/h 34.7 59.0
Flue gas mass ow at partial load kg/h 5.2 8.7
The minimum ue gas temperature at minimum thermal power ºC 44 34.3
The maximum ue gas temperature at maximum thermal power ºC 61 66.7
Fan characteristics
Time parameters
Time of central heating pump rundown s 180
Time preventing the anti-cyclical startup of the boiler
(Anti-cycling time) minutes 1÷ 60
Time of domestic hot water pump rundown s section 4.4 of this manual
Protection against pump and valve blocking
h /s
the pump turns on for 180 seconds every 24 hours
the pump and three way valve turns on for 15 seconds
every 48 hours
Assembly dimensions
Connection to the chimney duct (section 3.8. and table 7.1.) mm Coaxial Ø80/Ø125 or Coaxial Ø60/Ø100
Connection of heating water (CH) and gas inch G3/4
Dimensions (internal boiler) mm 740x400x340 740x400x340
Dimensions (external boiler with outdoor casing) mm 1220x540x350 1220x540x350
Boiler weight kg 31.5 37.5
Environmental protection
Emissions of nitrogen oxides mg/kWh 21 29
Emission of NO (natural gas) class 6
The pH of the condensate natural gas - 5
Sound power level LWA dB 48 48
Hydraulic parameters
Expansion vessel capacity dm 6
Water pressure in expansion vessel MPa (bar) 0.08 ±0.02 (0.8) ±0.2
2.2.2 Technical data

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Electric parameters
Type and supply voltage V ~ 230 ±10%/50Hz
Degree of protection IPX4D
Power consumption W 110
Standby mode power consumption PSB kW 0.005
Electricity consumption :
- at full load
- at part load
kW
kW
0.05
0.02
0.05
0.02
Maximum nominal current value of output terminals A2
Type of ame sensor ionization
The manufacturer reserves the right to make changes to the construction of the boiler, which are not mentioned herein and have
no inuence on the technical and functional characteristics of the boiler.
2.3 EQUIPMENT PROTECTION
The X Boiler BD Series is made up of many intricate components that require protection. The following protective measures
ensure the boiler’s safety and longevity in response to different negative scenarios it could be subjected to during the course
of its operation:
• Protection against gas outow
• Protection against explosive gas switching on
• Protection against exceeding the max temperature in the heating water system
• Protection against exceeding the upper limit of heating water temperature
• Protection against water pressure increase (1st degree) - electronic
• Protection against water pressure increase (2nd degree) - mechanical
• Protection against drop of water pressure
• Protection against water overheating
• Anti-freezing protection of the boiler
• Protection against pump blockage
• Monitoring of correct fan operation. Fan failure is detected if the current fan speed is different from that expected by
the driver of the boiler.
• Protection against exceeding the upper limit temperature of ue gas (115°C).
Errors which do not require manual reset will cause the boiler to return to normal operation after automatic disappearance
of failure. See section 5.8 for boiler diagnostics.
NOTE! In case of repeated emergency boiler shut-downs in response to equipment protection measures, it is necessary to
contact an Authorised Service Company for diagnosis and repair. It is forbidden to make any unauthorised modications to
the protection system.
2.4 OPERATION DESCRIPTION
2.4.1 Heating water in a central heating system
The boiler switches on if the heating water temperature drops about 5 degrees below the set temperature - as described
in section 5.5.1. The room thermostat gives the boiler the signal to heat and the following conditions occur simultaneously:
• power supply of the three-way valve (item 12 towards the central heating installation),
• pump supply (item 7),
• fan supply (item 5),
• the sequence of ignition,
• the driver starts the fan speed regulation in order to obtain the desired temperature of heating water
The boiler switches off when the room temperature control unit is signalising the desired temperature in the room or when
the heating water temperature is higher than desired (by value of hysteresis see P20). In this case, “L3” is shown on the
display. After switching off the burner, the pump continues to run for about 180 s and the fan for 15 s.
For Australia and New Zealand, please refer to settings in Table 4.3.2.1 on page 24.

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Restart of the boiler takes place automatically under the following conditions simultaneously:
• heating water temperature is 5°C lower than the set temperature,
• room temperature control unit shows the signal “HEAT”,
• waiting time controlled by parameter P25 has passed (default is 3 minutes) after L3 was displayed.
The list of driver parameters can be found in Table 5.6.
2.4.2 Temperature regulation dependent on external temperature
When an external temperature sensor is connected, the boiler controller detects it automatically and switches to the weather
function mode. In this mode, the controller adjusts the heating water temperature according to the relationship described
by the heating curves in Fig. 2.4.2.1 and Fig. 2.4.2.2. The graphs show that the heating water temperature is a function of the
outside temperature, the coefcient of the slope of the heating curve Kt and the value of parameter P22. A at heating curve
means that if the outdoor temperature changes by a large value, the heating water temperature leaving the boiler will only
need to change by a small value (e.g., a well-insulated house). On the other hand, for a steep curve, a small change in outdoor
temperature needs a correspondingly large change in the heating water temperature (e.g., a poorly insulated house).
Changing the value of the coefcient Kt (the slope of the heating curve) is explained in section 5.5.1.1.
Fig.2.4.2.1 Diagram of the heating curve (standard heating) Fig.2.4.2.2 Diagram of the heating curve (oor heating)
2.4.3 Heating water with the X Boiler BD Series connected to a domestic water tank
The X Boiler BD Series is factory designed to connect with a domestic hot water tank. The domestic water temperature is
displayed and can be adjusted with the control panel of the boiler.
NOTE! Signal occurs: If RT regulator contacts are closed or due to operating in the weather function mode without a room
thermostat (P26=2).
NOTE!
1. For value Tout= 25°C and P22=0, the calculated temperature, T.C.H. is always equal to Tmin. At Ktmax. and P22=0, Tmax is
reached when Tout is 10°C.
2. Tmax will not exceed 80°C for standard heating and 55°C for oor heating regardless of the value P22.
3. In situations where the boiler operates in weather function mode without a room thermostat (parameter P26=2), the
room temperature regulator (RT) input is treated as an input for the choice of time of day: DAY (contact open), NIGHT
(contact closed). During NIGHT time, the calculated temperature, T.C.H is reduced by the P28 parameter value. The
boiler starts heating C.H. water if the outdoor temperature is lower than the P27 parameter value. The boiler stops
heating C.H. water if the outdoor temperature is higher than the P27 parameter value for at least 3 hours.
4. If P26=0, the weather function is not activated. It is only an outdoor temperature measurement.
5. Parameter P29 controls maximum C.H. water temperature.

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The heating process for domestic water:
When the water temperature sensor of the hot water tank detects that the temperature is 5°C lower than the set value
(see section 5.5.2), the process of pumping water to the central heating system is stopped. The process for heating domestic
water with a boiler connected to the domestic hot water tank starts as follows:
• the water temperature sensor detects that the temperature is 5°C lower than the set value (for example, as a result of
opening a tap);
• the boiler controller switches the three-way valve to pump water to the hot water tank circuit while giving a signal to
the spark generator and gas valve (item 8);
• heating water with temperature described by parameter P21 (default 75°C) ows through the coil of the tank (short
circuit);
• after exceeding the set water temperature in the tank by 1°C, the boiler controller switches the 3-way valve to the
hydronic heating circuit. After meeting the below-mentioned conditions, the heating water is pumped into the central
heating system:
• heating water temperature is 5°C lower than the set temperature
• room temperature regulator gives a signal “HEAT”.
The temperature of hot water at the point of consumption may be different from the set value, and therefore it is advisable
to install a mixing/ tempering valve for domestic hot water systems.
Water heating in the hot water tank is active when the electrical bridge is mounted on the TANK-TIMER input (Fig. 3.9.1.)
and when the set temperature value is higher or equal to the minimum value. If the value is set lower than the minimum,
the hot water tank circuit is closed. This does not apply for frost protection function.
NOTE! To eradicate Legionella bacteria in the storage tank, the boiler is turned on every 168 h and the water in the tank
is heated to 65°C. If the Legionella function does not work in automatic mode, the user at any time can manually initiate a
single cycle of tank heating to 65°C.
2.4.3.1 Manual initiation of domestic tank overheating - Anti-Legionella function in manual mode
* (applies to the boilers with tanks):
If the boiler is operating in SUMMER mode:
Press the button twice. The rst press of the button shows (ready to modify) option C.H. setting on the control panel’s
display. Pressing the button a second time displays the symbols characteristic of Legionella Function; a ashing key symbol
on the right of the display, on the left side, you can see the DHW temperature and the symbol MAX placed above it. See Fig.
5.2.1 for an illustration of the control panel display.
If the boiler is operating in WINTER MODE:
Press the button three times. Pressing the button the rst time shows (ready to modify) option C.H. setting on display.
Pressing the button a second time displays the symbols characteristic of the Service Function. The third press of the button
displays the symbols characteristic of the Legionella Function.
In both modes of operation:
To activate the Legionella function, hold the “+” button for 2 seconds. After activation, the symbol ‘key’ will light up with a
solid light. You have about 3 seconds to complete the Legionella function activation. After this time, or when you press the
reset button, the system goes to the “selection of operation mode” (winter or summer).
During the implementation of Legionella Function, the temperature eld (on the left side) is dimmed.
2.4.4 Operation of the pump with adjustable speed.
For boilers equipped with a variable speed pump (PWM) while operating in DHW mode the pump speed is determined by
parameter P19.

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13
For conventional PWM pump operation (parameter P15=0)
The PWM pump (activated by parameter P12) works with a modulated speed in the C.H. system activated by the signal
from the room temperature regulator (RT). The rotational speed is adjusted in such a way in cooperation with the modulator
to achieve the value of delta T dened by parameter P13 (the difference between outgoing and return temperature of the
central heating system). Achieving and maintaining the set temperature of the central heating system is the priority. The
minimum allowable rotational pump speed is determined by parameter P14. The maximum allowable rotation of the pump
is determined by parameter P18.
ECO mode (parameter P15 = 1)
The PWM Pump (selection using parameter P12) works with a modulated speed in the C.H. system and is activated by the
signal from RT. The pump’s rotational speed is adjusted in such a way in cooperation with the modulator to achieve the
expected delta T value, the difference between outgoing and return temperature of the central heating system (calculated
on the basis of the preset ratio ECO.
The ECO factor can be changed using the boiler controller between the range 0.1 to 0.9. The default value (optimal in most
cases) is 0.5. Selecting lower values results in lower gas consumption leading to reduced heat energy being transferred into
the room. The user benets by being able to regulate the boiler to achieve the desired thermal comfort at minimum cost (less
gas consumption, lower power consumption).
An ECO factor value of 0.5 is the maximum for which the control seeks to meet the conditions promoting condensation
(C.H. return temperature <=55 C) regardless of the water temperature setting in C.H.. It is recommended to operate the
C.H. system with an ECO ratio within the range of 0.1 to 0.5. If increasing the set C.H. heating water temperature does not
produce adequate thermal comfort, the value of the ECO factor should be increased gradually. An ECO factor equal to 0.9
practically corresponds to the traditional work of a pump without speed control.
Irrespective of the mode of operation:
It is a priority to achieve and maintain the set C.H. temperature of water. The minimum allowable rotational speed of the
pump is determined by parameter P14. The maximum is determined by parameter P18.
2.4.4.1 Expected T value depending on the C.H. water setting and the ECO coefcient
The expected value of T depending on the C.H. water setting and the ECO coefcient.
Standard heating (P8 = 0): Setting of C.H. water Floor heating (P8 = 1): Setting of C.H. water
Eco 40°C 45°C 50°C 55°C 60°C 65°C 70°C 75°C 80°C Eco 35°C 40°C 45°C 50°C 55°C
0,1 24 30 35 35 35 35 35 38 42 0,1 16 24 30 35 35
0,2 21 26 30 30 30 30 30 33 37 0,2 14 21 26 30 30
0,3 18 22 26 26 26 26 26 28 31 0,3 12 18 22 26 26
0,4 15 19 22 22 22 22 22 24 26 0,4 10 15 19 22 22
0,5 12 15 17 17 17 17 17 19 21 0,5 8 12 15 17 17
0,6 9 11 13 13 13 13 13 14 15 0,6 6 9 11 13 13
0,7 6788888910 0,7 4678 8
0,8 3344444450,8 2334 4
0,9 000000000 0,9 00000
NOTE! If the temperature sensor of the return water from central heating is damaged or is not connected, the pump works
at a constant speed.

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14
3. BOILER INSTALLATION
The boiler must be installed by an authorised service company and according to local regulations. Installation of the boiler
must be done so that its position is unaffected by any tension arising from increased work volumes (noise, vibrations, and
stresses). After installation is complete, check the tightness of all gas, water, and ue gas connections in the system.
3.1 REQUIREMENTS FOR BOILER INSTALLATION
3.1.1 The installation regulations for the water, gas and the ue gas system
The use of gas appliances, ues and ventilation should be consistent with AS/NZS 5601 and local requirements relating to
the technical conditions of their use in residential buildings.
Before installing the boiler, check whether the consent from the District Department of Gas, Chimney Sweep Company and
Building Administration must be obtained.
NOTE!
Gas appliances supplied with liqueed gas must not be installed in rooms with a oor below ground level.
If liqueed gas 3B/P is used, it is recommended that the room temperature where the gas cylinder will be operated is not
less than 15ºC.
NOTE! The main socket through which the boiler is powered must comply with PN-IEC-60364-6-61:2000
3.1.2 Regulations related to the room
Requirements for premises where gas appliances are installed should be in accordance with local regulations. The room
where the boiler is to be installed should meet the air supply and venting system requirements for gas combustion,
according to regulations. In addition, the room’s temperature should be higher than 6ºC and the location of the ventilation
system should not cause the freezing of water.
The room should also be free from dust and aggressive
gases. It is forbidden to install the boiler in laundry rooms,
drying rooms, or rooms where varnish, cleaners, solvents,
and sprays are stored.
The device covered by this instruction manual has a Zone
1 degree of electrical protection provided by the housing
- IPX4D. A boiler equipped with a power cord and plug can
be installed in Zone 2 or further - but must not be installed
in Zone 1, unless it is permanently connected to a power
source, in accordance with HD 60364-7-701.
3.1.3 Requirements for electrical installation
The boiler has been designed for operation with single-phase alternating current with a rated voltage of 230 V/50 Hz.
The boiler has been designed as a “class I“ device and must be connected to an electrical outlet with ground terminal in
accordance with PN- IEC 60364-4-41.
Fig. 3.1.2.1. The zones dimensions in areas containing a bath or shower with a pool
Be careful to connect the power cord correctly. If done incorrectly:
• the boiler enters into failure state
• E01 (error) will show on the display (see section 5.8.3)

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In case of an incorrect connection, change cords “L” and “N” in the socket. When the correct connection is detected, the
boiler unlocks automatically. The X Boiler has a degree of electrical protection provided by the housing - IPX4D.
In situations where the boiler is permanently connected to the power supply, the electrical installation should be equipped
with a means of disconnecting the boiler from the power source, in the form of a junction box. The junction box must be
equipped with protection to the degree appropriate for the dened assembly zone. In order to connect the boiler to the
junction box, it is recommended to:
• cut the power cord to a suitable length for connection to the box
• pull off cable insulation
• use cable end-sleeves with appropriate diameter and connect everything according to the following diagram:
Fig 3.1.3.1 Wire colors: L – brown; N – blue; PE – yellow-green
Fig. 3.3.1 Installation dimensions of the X boiler
3.2 PRELIMINARY CHECK ACTIVITIES
Before starting the installation, check:
• whether the boiler is factory designed for the type of gas supplied from the gas system. The type of gas which the
boiler is designed for is specied on the rating plate on the cover of the boiler;
• whether the water system and radiators have been properly rinsed with water to remove rust, llings scale, sand and
other dusts that could pollute the heat exchanger or affect the boiler’s operation negatively (such as increasing the
water ow resistance in the central heating system),
• whether the mains voltage has a value of 230 V and that the socket has an efcient safety contact (complies with PN-
IEC-60 364-6-61: 2000).
3.3 MOUNTING THE BOILER ON THE WALL
Hang the boiler on hooks fastened durably into the wall using a beam placed in the upper part of the boiler. The boiler’s
location should permit its eventual repair without any need to dismantle from the installation position.
For outdoor installations ensure the same clearances from the outer casing.

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3.4 MOUNTING THE OUTDOOR CASING
Set includes:
• Outdoor casing for boiler
• Set of keys for casing locks – 2 pcs.
• Mounting dowel set with screws – 4 pcs.
Intended use
The outdoor casing is designed for installation of the boiler in
partially sheltered places, protecting the boiler from the inuence
of atmospheric factors and the interference of unauthorized
persons.
Warning:
The place of installation must be pre-protected against rain.
Protection of the boiler against frost -according to the operating
instructions of the device.

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Installation of the boiler in the outdoor casing
• In order to facilitate access to the mounting holes,
open the casing door (A) using the enclosed keys, then
remove the front cover (B).
• Before mounting the casing on the wall, break through
holes for the ue gas system. Holes are described as:
• C60/100 - are intended for a coaxial system ø60/
ø100
• S80 - are intended for a separate system ø80/ø80.
• Mount the outdoor casing on the wall using the
enclosed expansion bolts (4 pcs.).
Warning:
Different substrates require a specic mounting system.
Before starting the installation of the casing, it is necessary
to check whether the enclosed mounting dowels are
suitable for the installation location.
• Hang the boiler on a hanger inside the casing.
• Connection of the boiler to the gas and hydraulic
system, as well as installation of the ue gas exhaust
system and supply of combustion air, should be
performed according to the instruction provided with
the device.
Warning:
In case of installation of the boiler as a type B device - taking
air from the room where it is located, the outdoor casing
has appropriate ventilation to ensure the supply of air in the
appropriate amount.
• After all necessary installation activities, install the
front cover (B).

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3.5 CONNECTION TO THE GAS INSTALLATION
Connect a gas supply pipe directly to the gas connection of the boiler using a connector with subassembly no 0696.00.00.00
(in boiler equipment).
NOTE! It is necessary to install a gas lter on the gas supply pipe to prevent harmful deposits from interfering with
the boiler, ensuring the proper operation of the gas unit and burner. This lter is not included with the standard boiler
equipment. It should be purchased separately.
NOTE! Before installing the boiler, thoroughly ush the central heating system to free it from any solid impurities. It is
recommended after the rst start up of the boiler and heating of the installation to drain the water from the system to remove
any residues of a metallurgical nature. This precautionary measure would benet the device’s operation and promote the
effective long-term use of its components.
Install a cut-off valve on the gas pipe in an accessible location.
3.6 CONNECTION OF THE BOILER TO A CENTRAL HEATING WATER SYSTEM
• Power supply and return connectors of the central heating boiler should be screwed to the installation. See Figure
3.3.1 for the location of the connectors.
• Install a water lter on the return water from the central heating system (in front of the connection with the pump).
The lter is not included with the standard boiler equipment.
• The C.H. system should be thoroughly rinsed out before the boiler is connected. It is permitted to use a suitable
antifreeze uid as a heat carrier in the winter season.
• Cut-off valves need to be installed between the boiler and the C.H. system so that the boiler can be dismounted
without draining the system. Do not install any thermostatic valves on radiators in the room where a thermostat is
installed as their operation and communication with the boiler will be in conict with one another.
• It is recommended to lead water out from the safety valve (item 25, 3 bar) to a oor drain using a tube or hose to
reduce the risk of ooding during the safety valve activation (excluded of manufacturer’s liability if ooding occurs).
Selection of expansion vessel
The X Boiler can be connected to a central heating system that has a maximum capacity of 105 liters. Connecting the boiler
to a C.H. installation which requires a larger capacity is acceptable only after connecting an additional expansion vessel
to the boiler. The vessel should be selected with reference to the design of the C.H. system and installed by an approved
contractor in accordance with applicable regulations.
After boiler installation:
• It is recommended to drain the water from the system rst to remove residues and dirty water after the 1st start up of
the boiler and heating up of the installation. Install a lling valve from the installation. The pressure in cold installation
should be in the range 1,0 to 1,5 bar (indicated by manometer).
• Vent the installation of the central heating and boiler;
• Check the tightness of the boiler connections in the central heating system.
• Install a lling valve and ll the heating system with water.
Fig. 3.5.1 Boilers installation requirements

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3.6.2 System cleaning and the treatment of water for lling the C.H. system
The boiler is the most expensive part of the C.H. system. It is, therefore, necessary to protect components of the system
like heat exchangers and other parts against harmful conditions such as limestone deposition and corrosion of internal walls
and surfaces. Correct C.H. circuit preparation relies on performing two operations: cleaning the C.H. system and treating
the water that lls the system.
System cleaning
In a new boiler installation, it is possible to nd remains from industrial process soldering and welding, and residues from
ux, oil, and grease among others. Older installations usually have products of corrosion in them. It is necessary to clean
up the C.H. system with water rst to remove any remains before the boiler is mounted. Afterward, the system should be
cleaned with appropriate chemicals. For example, Cleaner F3 from Fernox in new installations and cleaner F5 for old and
contaminated systems. Following that, the installation should be rinsed out with water.
Treatment of water for lling the central heating system
For lling the C.H. system, it is recommended to use water with parameters: pH 6,5- 8,5, hardness < 10 n (~ 18 F). Do not use
demineralised or distilled water. To protect against limescale deposition and corrosion, it is recommended to use a special
inhibitor. Heat transfer uid HP-5 or antifreeze liquid can also be used. If the water hardness is very high, HP-5 effectively
reduces the risk of heat exchanger calcication.
Low-temperature circuits
In low-temperature areas, it is recommended to treat the lling water using a heat transfer uid such as HP-5 or Fernox
AF10 biocide.
Filtration technique
Additionally, in order to ensure the quality of the heating system’s operation, it is recommended to mount modern lters,
which work on the principle of magnetic and cyclone effect, for example, Fernox TF1 lter.
NOTE!
• The method and amounts of specic products used for system cleaning and water treatment should be in accordance
with the product manufacturer’s instruction.
• The above steps should be performed by an authorised installer or service technician.
NOTE! It is recommended to install a water lter in the connection with the domestic water supply. This lter is not
included in the standard boiler equipment.
3.7 CONNECTION OF THE BOILER TO A DOMESTIC HOT WATER SYSTEM
It is recommended to install cut-off valves on a domestic hot water system which will enable easier maintenance and
service.
3.8 CONDENSATE OUTLET
Condensation formed during the combustion process must be drained according to the following requirements:
• Installed condensate drain must be made of corrosion-resistant material.
• Connection for draining the condensate cannot be blocked.
• To facilitate the draining of water condensing from the ue gas, all horizontal ue pipes must be installed with a fall
of 3° (52mm / m).
3.9 FLUE GAS OUTLET
The X Boiler can be installed as a B-type appliance, for which the air needed for combustion is taken from the room where
the boiler is installed. If installed as a C-type appliance, the air needed for combustion is taken from outside the building.
Regardless of the source of air, provision needs to be made for the ue gas produced after combustion to escape. The ue
gas outlet system installation depends on the type of combustion.
Depending on local regulations, some types of ue gas installations might not be allowed. Therefore, the regulations should
be consulted before undertaking any ue gas projects. To ensure the boiler functions properly with the ue-gas outlet
system installed, the appropriate pipe dimensions in terms of diameter, maximum length, and elbow resistance should be
used. See Tables 3.8.1.1. and 3.8.2.1 for appropriate pipe dimensions depending on the installation.

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Fig. 3.9.2 illustrates the different ue gas-air system installations. For the X boiler, the types of ue gas-air systems possible:
coaxial system Ø80/Ø125 and Ø60/Ø100. Note that the ow resistance in each elbow is dependent on the bending angle.
The related reduction of the maximum pipe length is given in section 3.8.5. The individual components of the ue gas-air
systems are given in Table 7.1.
In addition, the ue gas-air system should be installed with a windproof outlet to protect against external factors.
Before turning on the boiler, make sure all connections associated with the ue outlet are tight.
After turning on the boiler, check the combustion parameters by noting the concentration of CO2 and/or O2 in the ue gas
to be sure the boiler is operating properly.
NOTE!
• The boiler is factory tted with a coaxial exhaust system Ø60/Ø100 with a maximum pipe length 3m + elbow. Settings
O2: 5%. For use with other ue gas-air systems and longer pipes, adjust the boiler as specied in section 4.2
• When using coaxial ue gas-air pipe Ø80/Ø125, apply a coaxial reduction Ø60/Ø100 x Ø80/Ø125 to adaptor Ø60/
Ø100 mounted in the boiler; or replace the mounted adaptor Ø60/Ø100 and a reduction ring Ø60/Ø80 with adaptor
Ø60/Ø100 (insert to resistance the exhaust pipe Ø80 directly to the heat exchanger). Adaptors connecting the boiler
with the pipe system must have measuring points.
• The X Boiler meet the requirements for use in multi-story, ue gas-air systems (LAS).
3.9.1. Horizontal outlet of ue gas-air system through the wall or the roof
Table 3.8.1.1
Type of boiler Coaxial system Ø60/Ø100
X BOILER BD 23 Maximum length of chimney ue L max = 15 m
X BOILER BD 38 Maximum length of chimney ue L max = 12 m
Coaxial system Ø80/Ø125
X BOILER BD 23 Maximum length of chimney ue L max = 25 m
X BOILER BD 38 Maximum length of chimney ue L max = 20 m