Baxi PRIME Series User manual

26 - 1.24 - 30
en CONDENSING GAS WALL-HUNG BOILERS
Installation manual for the Installer
de KONDENSATIONS-WANDGASHEIZKESSEL
Betriebsanleitung für den Installateur
es CALDERA MURAL DE GAS DE CONDENSACIÓN
Manual de uso destinado al instalador
cs PLYNOVÉ ZÁVĚSNÉ KONDENZAČNÍ KOTLE
Návod k použití určený pro instalatéra
sk PLYNOVÉ ZÁVESNÉ KONDENZAČNÉ KOTLE
Návod na použitie určený pre inštalatéra
el ΕΠΙΤΟΙΧΙΟΣ ΛΕΒΗΤΑΣ ΑΕΡΙΟΥ ΣΥΜΠΥΚΝΩΣΗΣ
Εγχειρίδιο χρήσης για τον εγκαταστάτη
hu KONDENZÁCIÓS FALI GÁZKAZÁN
A szerelőnek szóló kézikönyv
pl KONDENSACYJNE KOTŁY ŚCIENNE GAZOWE
Podręcznik obsługi dla instalatora
ro CENTRALĂ TERMICĂ MURALĂ CU CONDENSARE, PE GAZ
Manual de instrucţiuni destinat instalatorului
ru НАСТЕННЫЙ ГАЗОВЫЙ КОНДЕНСАЦИОННЫЙ КОТЕЛ
Руководство для использования монтажником

7696306 (01-12/17) 2
INSTALLER Section (en)
The appliance can be used by children aged 8 or over
and by people with reduced physical, sensory or men-
tal faculties, or who do not have the required experience
or knowledge, provided they are supervised or have re-
ceived instructions on using the appliance safely and un-
derstanding its intrinsic hazards. Children must not play
with the appliance. The cleaning and maintenance opera-
tions reserved to the user must not be performed by un-
supervised children.
CONTENT
1. SAFETY ........................................................................................................................................................................................................3
1.1 GENERAL SAFETY INSTRUCTIONS ..........................................................................................................................................................3
1.2 RECOMMENDATIONS .................................................................................................................................................................................3
1.3 LIABILITIES ..................................................................................................................................................................................................3
2. ABOUT THIS MANUAL.................................................................................................................................................................................4
2.1 GENERAL.....................................................................................................................................................................................................4
2.2 SYMBOLS USED..........................................................................................................................................................................................4
3. TECHNICAL SPECIFICATIONS ...................................................................................................................................................................4
3.1 HOMOLOGATIONS ......................................................................................................................................................................................4
3.2 TECHNICAL DATA........................................................................................................................................................................................5
3.2.1 TECHNICAL PARAMETERS ........................................................................................................................................................................6
3.2.2 CHARACTERISTICS OF TEMPERATURE SENSORS................................................................................................................................7
3.3 DIMENSIONS AND CONNECTIONS ...........................................................................................................................................................7
3.4 ELECTRICAL DIAGRAM ..............................................................................................................................................................................10
4. DESCRIPTION OF THE PRODUCT.............................................................................................................................................................12
4.1 GENERAL DESCRIPTION............................................................................................................................................................................12
4.2 OPERATING PRINCIPLE .............................................................................................................................................................................12
4.3 MAIN COMPONENTS ..................................................................................................................................................................................13
4.4 USE OF THE CONTROL PANEL..................................................................................................................................................................13
4.5 STANDARD DELIVERY................................................................................................................................................................................14
4.6 ACCESSORIES & OPTIONS........................................................................................................................................................................14
5. BEFORE INSTALLATION .............................................................................................................................................................................14
5.1 INSTALLATION REGULATIONS...................................................................................................................................................................14
5.2 INSTALLATION REQUIREMENTS ...............................................................................................................................................................14
5.3 CHOICE OF THE LOCATION.......................................................................................................................................................................15
5.4 TRANSPORT ................................................................................................................................................................................................17
5.5 UNPACKING/INITIAL PREPARATION..........................................................................................................................................................17
6. INSTALLATION .............................................................................................................................................................................................18
6.1 GENERAL.....................................................................................................................................................................................................18
6.2 PREPARATION.............................................................................................................................................................................................18
6.3 WATER CONNECTIONS ..............................................................................................................................................................................21
6.4 GAS CONNECTION .....................................................................................................................................................................................22
6.5 AIR SUPPLY/FLUE GAS CONNECTIONS...................................................................................................................................................22
6.6 ELECTRICAL CONNECTIONS.....................................................................................................................................................................28
6.7 FILLING THE INSTALLATION ......................................................................................................................................................................31
6.8 COMPLETING THE INSTALLATION ............................................................................................................................................................31
7. COMMISSIONING ........................................................................................................................................................................................32
7.1 GENERAL.....................................................................................................................................................................................................32
7.2 CHECKLIST BEFORE COMMISSIONING ...................................................................................................................................................32
7.3 COMMISSIONING PROCEDURE ................................................................................................................................................................32
7.4 GAS SETTINGS............................................................................................................................................................................................33
7.5 FINAL INSTRUCTIONS ................................................................................................................................................................................34
8. OPERATION .................................................................................................................................................................................................35
8.1 START-UP.....................................................................................................................................................................................................35
8.2 SHUT-DOWN ................................................................................................................................................................................................35
8.3 FROST PROTECTION..................................................................................................................................................................................35
8.4 VENTING FUNCTION...................................................................................................................................................................................35
9. SETTINGS ....................................................................................................................................................................................................36
9.1 LIST OF PARAMETERS ...............................................................................................................................................................................36
9.2 RESETTING OF THE FACTORY SETTINGS...............................................................................................................................................37
9.3 SETTING THE CLIMATIC CURVE ...............................................................................................................................................................37
9.4 TEMPERATURE REGULATION WITH EXTERNAL PROBE CONNECTED................................................................................................38
9.5 READING OUT MEASURED VALUES.........................................................................................................................................................38
STATES AND SUB-STATES .........................................................................................................................................................................39
10. MAINTENANCE............................................................................................................................................................................................40
10.1 GENERAL.....................................................................................................................................................................................................40
10.2 MAINTENANCE MESSAGE .........................................................................................................................................................................40
10.3 STANDARD INSPECTION AND MAINTENANCE OPERATIONS................................................................................................................40
REMOVING SCALE......................................................................................................................................................................................43
10.4 SPECIFIC MAINTENANCE OPERATIONS ..................................................................................................................................................43
11. TROUBLESHOOTING ..................................................................................................................................................................................44
11.1 ERROR CODES ...........................................................................................................................................................................................45
12. DECOMMISSIONING ...................................................................................................................................................................................48
12.1 DECOMMISSIONING PROCEDURE ...........................................................................................................................................................48
13. APPENDIX....................................................................................................................................................................................................48
13.1 PRODUCT FICHE.........................................................................................................................................................................................48

3
INSTALLER Section (en)
7696306 (01-12/17)
1. SAFETY
1.1 General safety instructions
SMELL OF GAS
• Switch off the boiler.
• Do not activate any electrical device (such as switching on the light).
• Put out any naked ames and open the windows.
• Call an Authorised Service Centre.
SMELL OF COMBUSTION FUMES
• Switch off the boiler.
• Open all the doors and windows to ventilate the room.
• Call an Authorised Service Centre.
FLAMMABLE MATERIAL
Do not use and/or store highly ammable material (thinners, paper, etc.) near the boiler.
SERVICING AND CLEANING THE BOILER
Switch off the boiler before working on it.
1.2 Recommendations
Only qualied technicians are authorised to service the device and system.
The appliance is not intended to be used by persons with reduced physical, sensory or mental capacities, or who lack
experience or knowledge, unless, through the mediation of a person responsible for their safety, they have had the benet
of supervision or of instructions on the use of the appliance.
Failure to observe the above will render the warranty null and void. Prior to commissioning, remove the protective plastic
coating from the boiler. Do not use any tools or abrasive detergents to do this as you may damage the painted surfaces.
Do not leave any packaging (plastic bags, polystyrene, etc.) within the reach of children as they are a potential source of danger.
SOLAR WARNING
If the instantaneous (mixed) boiler is connected to a system with solar panels, the maximum temperature of the domestic hot water
entering the boiler must not exceed 60°C.
1.3 Liabilities
1.3.1 RESPONSIBILITIES OF THE INSTALLER
The installer is responsible for installation and commissioning of the device. The installer must follow the instructions below:
• Read and observe the instructions in the manuals provided with the device.
• Install the device in compliance with the laws and standards in force.
• Perform commissioning and all necessary checks.
• Explain installation to the user.
• With regard to maintenance, inform the user of the need to check the device regularly and to keep it in good working order.
• Provide the user with all the instruction manuals.
1.3.2 RESPONSIBILITIES OF THE PRODUCER
Our products all have marking. As our company constantly strives to improve its products, it reserves the right to modify the
information given in this document at any time and without notice. This document is issued purely for the sake of information and
should not be considered as a contract with third parties. As the producer, we cannot be held responsible for the following:
• Failure to observe the instructions on installation of the device.
• Failure to observe the instructions on use of the device.
• Negligent or insufcient maintenance of the device.

7696306 (01-12/17) 4
INSTALLER Section (en)
2. ABOUT THIS MANUAL
2.1 General
This manual is intended for the installer of a PRIME boiler.
2.2 Symbols used
WARNING
Risk of damage to, or malfunction of the appliance. Pay special attention to the warnings concerning
danger to people.
DANGER OF BURNS
Wait for the appliance to cool down before working on the parts exposed to heat.
DANGER - HIGH VOLTAGE
Live components - electrocution hazard.
DANGER OF FREEZING
Possible formation of ice due to low temperatures.
IMPORTANT INFORMATION
Information to read with particular care as it is useful for the correct operation of the boiler.
GENERIC PROHIBITION
It is forbidden to do/use the things indicated alongside the symbol.
FRONT VIEW
The front part of the device is shown in the gure.
SIDE VIEW
The side of the device is shown in the gure.
3. TECHNICAL SPECIFICATIONS
3.1 Homologations
3.1.1 Directives
Our company declares that these products are marked in compliance with the essential requirements of the following
Directives:
• Gas Directive 2009/142/EC (until 20 April 2018)
• Gas regulation (EU) 2016/426 (since 21 April 2018)
• Efciency Directive 92/42/EEC
• Electromagnetic Compatibility Directive 2014/30/EU
• Low Voltage Directive 2014/35/EU
• Ecodesign directive 2009/125/EC
• Regulation (EU) No 2017/1369 (for boilers with Power<70kW)
• Ecodesign regulation (EU) No 813/2013
• Energy labelling regulation (EU) No 811/2013 (for boilers with Power<70kW)
As well as the legal requirements and directives, the additional directives referred to in these instructions must also be observed.
All additions and other rules apply from the time of installation.
3.1.2 Certication
We certify that the equipment specied below conforms to the model described in the CE declaration of conformity.
CE number 0085CQ0192
NOx Class 6
Type of ue connections B23 – B23P – B33 - C13 – C33 – C43 – C53 – C63 – C83 – C93

5
INSTALLER Section (en)
7696306 (01-12/17)
3.2 Technical data
PRIME 1.24 PRIME 26 PRIME 30
Heating only DHW Tank (*)
Cat. II2H3B/P
Gas used - G20 - G30 - G31
Rated heat input for DHW circuit (Qn) kW - 28.9 26.7 31.0
Rated heat input for heating circuit (Qn) kW 24.7 24.7 20.6 24.7
Reduced heat input (Qn) kW 4.9 4.9 4.9 4.9
Rated heat output for DHW circuit (Pn) kW - 28.0 26.0 30.0
Rated heat output 80/60 °C (Pn) kW 24.0 24.0 20.0 24.0
Rated heat output 80/60 (Pn)
Factory set heating mode value kW 24,0 24,0 20,0 20,0
Rated heat output 50/30 °C (Pn) kW 26.1 26.1 21.8 26.1
Reduced heat output 80/60 °C (Pn) kW 4.8 4.8 4.8 4.8
Reduced heat output 50/30 °C (Pn) kW 5.2 5.2 5.2 5.2
Rated efciency 50/30 °C (Hi) % 105.8 105.8 105.8 105.8
Max. pressure of water in heating circuit bar 3 3 3 3
Min. pressure of water in heating circuit bar 0.5 0.5 0.5 0.5
Capacity of water in expansion vessel l 7 7 7 7
Minimum pressure of expansion vessel bar 0.8 0.8 0.8 0.8
Max. pressure of water in DHW circuit bar - - 8.0 8.0
Min. dynamic pressure in DHW circuit bar - - 0.15 0.15
Minimum ow of water in DHW circuit l/min - - 2.0 2.0
Production of DHW with ∆T = 25 °C l/min - - 14.9 17.2
Production of DHW with ∆T = 35 °C l/min - - 10.6 12.3
Specic output “D” l/min - - 12.4 14.3
Temperature range in heating circuit °C 25÷80 25÷80 25÷80 25÷80
Temperature range in DHW circuit °C - 35÷60 35÷60 35÷60
Coaxial ue duct diameter mm 60/100 60/100 60/100 60/100
Diameter of separate outlets mm 80/80 - 80/80 80/80
Max. mass ow rate of fumes kg/s 0.012 0.014 0.013 0.015
Min. mass ow rate of fumes kg/s 0.002 0.002 0.002 0.002
Max. exhaust temperature °C 80 80 80 80
Natural gas supply pressure 2H mbar 20 20 20 20
Propane gas supply pressure 3B/P mbar 30 30 30 30
Power supply voltage V 230 230 230 230
Power supply frequency Hz 50 50 50 50
Rated power supply W 84 94 86 100
Net weight / water load Kg 26/28 26/28 26/28 26/28
Dimensions (height/width/depth) mm 700/395/279 700/395/279 700/395/279 700/395/279
Humidity protection level (EN 60529) - IPX5D IPX5D IPX5D IPX5D
CONSUMPTION AT HEAT INPUT Qmax and Qmin Heating only DHW Tank (*)
Qmax (G20) - 2H m3/h 2.61 3.06 2.82 3.28
Qmin (G20) - 2H m3/h 0.52 0.52 0.52 0.52
Qmax (G30) - 3B kg/h 1,95 2,28 2,10 2,44
Qmin (G30) - 3B kg/h 0,39 0,39 0,39 0,39
Qmax (G31) - 3P kg/h 1,92 2,25 2,07 2,41
Qmin (G31) - 3P kg/h 0,38 0,38 0,38 0,38
(*) Supplied as an accessory

7696306 (01-12/17) 6
INSTALLER Section (en)
3.2.1 Technical Parameters
In conformity with (EU) Regulation 813/2013.
BAXI PRIME 1.24 26 30
Condensing boiler Yes Yes Yes
Low-temperature boiler(1) No No No
B1 boiler No No No
Cogeneration space heater No No No
Combination heater No Yes Yes
Rated heat output
Pnominale kW 24 20 24
Useful heat output at rated heat output and high temperature
regime(2)
P4 kW 24,0 20,0 24,0
Useful heat output at 30% of rated heat output and low
temperature regime(1)
P1 kW 8,0 6,7 8,0
Seasonal space heating energy efciency ƞs %93 93 93
Useful efciency at rated heat output and high temperature
regime(2)
ƞ4 %88,0 88,1 88,0
Useful efciency at 30% of rated heat output and low
temperature regime(1)
ƞ1 %97,8 97,8 97,8
Auxiliary electricity consumption
Full load
elmax kW 0,038 0,028 0,038
Part load
elmin kW 0,011 0,011 0,011
Standby mode
PSB
kW 0,003 0,003 0,003
Other items
Standby heat loss
Pstby
kW 0,040 0,040 0,040
Ignition burner power consumption
Pign
kW 0,000 0,000 0,000
Annual energy consumption
QHE
GJ 74 62 74
Sound power level, indoors
LWA
dB 50 48 50
Emissions of nitrogen oxides NOXmg/kWh 40 38 40
Domestic hot water parameters
Declared load prole -XL XL
Daily electricity consumption
Qelec
kWh -0,163 0,166
Annual electricity consumption
AEC kWh -36 33
Water heating energy efciency
ƞwh
%-85 87
Daily fuel consumption
Qfuel
--22,82 22,16
Annual fuel consumption
AFC GJ -17 17
(1) Low temperature means for condensing boilers 30°C, for low temperature boilers 37°C and for other heaters 50°C
return temperature (at heater inlet).
(2) High temperature regime means 60°C return temperature at heater inlet and 80°C feed temperature at heater outlet.

7
INSTALLER Section (en)
7696306 (01-12/17)
3.2.2 Characteristics of temperature sensors
External probe temperature sensor (NTC1000 Beta 3688 1kOhm@25°C)
Temperature [°C] -20 -16 -12 -8 -4 0 4 8 12 16 20 24
Resistance [Ω] 7578 6166 5046 4152 3435 2857 2387 2004 1690 1433 1217 1040
Heating circuit ow - Return temperature sensor / DHW tank sensor (NTC10K Beta 3977 10KOhm@25°C)
Temperature [°C] 0 10 20 25 30 40 50 60 70 80 90 100
Resistance [Ω] 32505 19854 12483 9999 8060 5332 3608 2492 1754 1257 915 677
Fume temperature sensor (NTC20K Beta 3970 20kOhm@25°C)
Temperature [°C] 0 10 20 25 30 40 50 60 70 80 90 100
Resistance [Ω] 66050 40030 25030 20000 16090 10610 7166 4943 3478 2492 1816 1344
----- > 110 120 130 140 150 160 170 180 190 - - -
----- > 1009 768 592 461 364 290 233 189 155 - - -
3.3 Dimensions and connections
1
2
3
4
56 7
8
9
700
279
395
BO-0000002
Connector Description
1Safety valve
2CH circuit water ow/DHW storage boiler
3Condensate drain point
4CH circuit/boiler drain tap
5PRIME 26-30: DHW circuit hot water outlet (G1/2”)
PRIME 1.24 : DHW tank return (G3/4”)
6Gas inlet
7PRIME 26-30: DHW circuit cold water inlet
PRIME 1.24 : Cold water inlet with system lling tap
8CH circuit water return
9Filling tap

7696306 (01-12/17) 8
INSTALLER Section (en)
BO-0000003
Cod. 721373403
8
O
395
3/4" 1/2" 3/4"
1/2"
3/4"
34 33,5 65 65 65 65 67,5
101
148
198198
700
64
80
50 MIN
82,5
38
151
77
158
O116 MIN
O116 MIN
120
22
O
59
35
0 ÷ 15 mm
0
÷ 15 mm
1 2 3 4
32
PRIME 26-30

9
INSTALLER Section (en)
7696306 (01-12/17)
BO-0000148
8
395
3/4" 3/4" 3/4"
1/2"
3/4"
34 33, 565 65 65 65 67, 5
101
148
198 198
70 0
64
80
50 MIN
82, 5
38
151
77
158
116 MI N
116 MI N
120
22
59
35
0 ÷ 15 mm
0 ÷ 15 mm
32
PRIME 1.24

7696306 (01-12/17) 10
INSTALLER Section (en)
3.4 Electrical diagram
1
1
1
GND
1
PWM - P
L-BUS
HMI
1
1
1
L
N
GNYE
BN
BU
DV
BU
GNYE
BN
BU BN BK
P
230V - 50Hz
GY
GN
WH
BK
VT
BN
RD
BU
13
RD
RD
RD
RD
GN
WH
BN
BK
BK
RD
RD
VT
VT
BN
BN
BNBN
VT VT
RDRD BK BK
WH
BN GN
1 2 34 5 1 2 34 5671
2
1 2 3
GNYE
BN
BU
BK
WH
GY
VT
GN BN
BK
WH
GN
BN
RD
BU
RD
L-BUS
BK
RD
WH
GN
GN
WH
BK
BN
RD
16
F1
LN
230V - 50Hz
F1 (1,6A)
L
N
L(CH)
L(DW)
N
GV
SERVICE
On/Off
R-Bus
OS
X1-B
X6-BX7-B
X14-B
X8-B
X13-B
J
X9-B
L-BUS
W8-1 W8-2 W8-4 W8-3
ST
HS
WPS
DS RSFS
12
3
On
A
BO-0000004
TS
X6-A
X14-A
X13-A
X4-A
X5-A
X1-A
X3-A
X2-A
B
X12-B X11-B X10-BX3-B X2-B
X5-B
B
Off
A
JP1
SIG (W4)
C1 (W1)
(W5)
C2 (W2)
(W3)

11
INSTALLER Section (en)
7696306 (01-12/17)
ELECTRICAL CONNECTIONS IN THE BOILER (B)
X1-B
230V-50Hz power supply
1: Earth connector
2: L (230V)
3: N
X6-B Not used
X7-B PRIME 26-30: Solar sensor connection (TS)
PRIME 1.24: DHW tank connection probe (TS)
X8-B On-Off / R-Bus – Room Thermostat Connection (REMOVE the jumper to connect a device)
X9-B Service Connection (PC)
X13-B L-BUS connection
X14-B External sensor connection (OS)
1: external sensor
2: common
J
Dip-Switch
1: Maximum heating temperature OFF = 80°C - ON = 45°C (underoor installation)
2: OFF = Maximum power (heating)- ON = Boiler power 50% (heating)
3: OFF = Methane (G20) – ON = Propane (G31)
CONNECTIONS IN THE BOILER (A)
X1-A
230V-50Hz power supply
1: Earth connector
2: L (230V)
3: N
X2-A
Pump
1: Earthing
2: L (230V)
3: N
X3-A
3-way valve
1: L(CH) 230V - CH circuit opening command
2: L(DW) 230V - DHW circuit opening command
3: N - common
X4-A Pump PWM signal
X5-A
Sensor connection
HS: sensor demand for DHW (PRIME 26-30)
RS: CH circuit water return
DS: CH circuit water ow
FS: fumes
WPS: hydraulic pressure switch
ST: safety thermostat
X13-A Not used
X14-A L-BUS connection
X6-A Connection of HMI and boiler board - electrical connection board
GNYE Green/yellow
BN Brown
BU Blue (and light blue)
BK Black
WH White
YE Yellow
GN Green
RD Red
VT Violet (purple)
GY Grey (slate)

7696306 (01-12/17) 12
INSTALLER Section (en)
4. DESCRIPTION OF THE PRODUCT
4.1 General description
This boiler has been designed to heat water to a temperature lower than boiling point at atmospheric pressure. It must be
connected to a central heating system and to a domestic hot water supply system according to its performance and power output.
The characteristics of this boiler are:
• low polluting emissions;
• high-performance heating;
• discharge of combustion products by means of a concentric exhaust connector or separate ue-air ducts;
• front control panel with display;
• minimal weight and size.
4.2 Operating principle
4.2.1 Air-gas adjustment
The fan takes in the air and the gas is injected directly at the point of the Venturi. The electronic board automatically controls the
rotational speed of the fan in relation to the set-up parameters. The gas and air are mixed in the manifold. The amount of gas and
air is controlled correctly according to the gas/air ratio, in order to ensure optimal combustion at all times. The gas/air mixture ows
to the burner at the front of the heat exchanger. Here, the electric igniter creates a set of sparks to ignite the mixture and produce
thermal energy.
1. Heat exchanger (Heating)
2. Hydraulic unit
3. Plate exchanger
4. Safety valve
5. CH circuit water ow / DHW
tank
6. DHW outlet (G1/2")
7. Domestic cold water inlet
8. CH circuit water return
9. Pump
10. Three-way valve
11. Filling tap
12. DHW cold water inlet with
system lling tap
13. DHW tank return (G3/4”)
4.2.2 Combustion
The burner heats the heating water that circulates in the heat exchanger. When the temperature values of the combustion
gases are below the dew point (about 55 °C), the water vapour in the combustion gas condenses in the gas section of the heat
exchanger. Heat recovered during this condensation process (latent heat or condensation heat) is transferred to the heating water.
The cooled combustion gases ow out through the ue duct. The condensation water, instead, passes through a siphon.
4.2.3 Heating and production of domestic hot water.
Boilers for heating and the production of domestic hot water are tted with an integrated plate exchanger that heats the domestic
water. The heated water ows through a three-way valve to the heating system or to the plate heat exchanger. A ow detector
signals the opening of a hot water tap to the electronic board which turns the three-way valve to its hot water position and starts the
pump. The three-way valve is spring-loaded and requires electrical power only when it switches position. Priority is given to DHW.
4.2.4 Central heating and domestic hot water with external storage boiler
Heating-only boilers with production of domestic hot water connected to an external storage boiler (optional) do not have the
integrated plate exchanger. The heated water ows through a three-way valve to the heating system or to an external storage
boiler (if tted). The temperature probe of the external storage boiler connected to the boiler (section 6.6.9. Connecting an external
storage boiler) sends the heat demand to the electronic board which switches the three-way valve to its hot water position and
starts the pump. The three-way valve is spring-loaded and requires electrical power only when it switches position. If the boiler is
connected to the storage boiler, priority is given to the request for DHW.
1
BO-0000144
4
513128
9
10
11
M
3
67
2
M
PRIME 26-30 PRIME 1.24
58
1
9
4
10
12
11

13
INSTALLER Section (en)
7696306 (01-12/17)
4.3 Main components
1. Structure
2. Connections for wall mounting bracket
3. Fixing plate for transporting the boiler (to protect the
exchanger)
4. Expansion vessel lling/air control valve
5. Expansion vessel
6. Burner ange
7. Ignition/sensor electrode
8. Expansion vessel-hydraulic circuit connecting pipe
9. Air-gas assembly (control board, fan, Venturi)
10. Heating system and pump venting valve
11. Gas valve
12. Pump
13. 3-way valve
14. Pressure gauge (tted on control board)
15. DHW priority sensor PRIME 26-30
16. Boiler electrical connection board
17. Domestic plate exchanger xing screws PRIME 26-30; Plate
bypass xing screws PRIME 1.24
18. Domestic plate exchanger PRIME 26-30; Plate bypass
PRIME 1.24
19. Hydraulic safety valve
20. Siphon
21. Hydraulic pressure switch
22. Silencer
23. Siphon quick coupling (with gaskets)
24. Flow sensor (°C) - Heating circuit
25. Safety thermostat (limit)
26. Return sensor (°C) - Heating circuit (behind the silencer)
27. Water-fumes exchanger
28. Fume temperature sensor
4.4 Use of the control panel
BUTTON/HANDLE KEY:
Manual adjustment of heating temperature
Manual adjustment of DHW temperature
Enabling the ue cleaning function
RESET
RESET key
1 second = Manual fault reset
5 seconds = Venting function manual activation (chapter 8.4)
LEGEND OF SYMBOLS ON THE DISPLAY
Heating function enabled *
DHW function enabled *
Outside temperature
Need for maintenance RESET Reset the fault manually
Fault Burner lighting
*the symbol ashes when there is heat demand.
132 4
5
6
7
8
9
10
12
13
14
11
15
16
17181920
21
22
23
25
26
24
28
27
BO-0000005
BO-000007
OFF OFF
MAX MAX
RESET

7696306 (01-12/17) 14
INSTALLER Section (en)
4.5 Standard delivery
The boiler is delivered in a pack containing:
• a wall-mounted gas boiler;
• a xing bracket for the wall-mounted gas boiler;
• a ue gas connector;
• a three-pole cable for connecting to the mains;
• a paper template;
• an installation and maintenance manual;
• a user manual.
4.6 Accessories & options
Refer to the sales catalogue for information on all the various accessories.
5. BEFORE INSTALLATION
5.1 Installation regulations
The installation must satisfy the requirements of local by-laws and technical regulations.
5.2 Installation requirements
The technical notes and instructions below are intended for installers. Instructions on ignition and use of the boiler are in the
‘Instructions for Users’ section.
5.2.1 Electrical input
Electrical input: 230V~ 50Hz
Observe the poles of the terminals: phase (L), neutral (N) and earth .
5.2.2 Water treatment
The boiler and heating system can be lled with mains water.
Do not add chemical products to the water for heating without having rst consulted a water treatment specialist. For
example: anti-freeze, water softeners, products for increasing or decreasing the pH value, chemical additives and/or
inhibitors. These can damage the boiler and the heat exchanger in particular.
Clean the system with a volume of water equal to a minimum of 3 times the volume of water that the heating system can hold.
Clean the DHW circuit with a volume of water equal to a minimum of 20 times its capacity.
Baxi recommends specic products from the Baxi-BX line for the cleaning and care of systems; the products can be
purchased from the authorised "service" network.

15
INSTALLER Section (en)
7696306 (01-12/17)
The water in the system must meet these requirements:
Details Unit Total system power
≤ 70 kW
Level of acidity (untreated water) pH 7 - 9
Level of acidity (treated water) pH 7 - 8.5
Conductivity at 25 °C μS/cm ≤ 800
Chlorides mg/litre ≤ 150
Other components mg/litre < 1
Total hardness of the water
°F 1 - 35
°dH 0.5 - 20.0
mmol/litre 0.1 - 3.5
5.2.3 Pump capacity/head
This is a two-speed (85% CH and 100% DHW) high static head pump t for installation on any type of single or double-pipe CH
system. The automatic air valve incorporated in the pump allows quick venting of the heating system.
QFLOW 85 % Default speed
HHEAD 100 % Maximum settable value
1,5
2,0
2,5
3,0
3,5
4,0
4,5
5,0
5,5
6,0
0200 400600 80
01
000
H (mH2O)
Q (l/h)
100%
85%
BO-0000050
5.3 Choice of the location
Before installing the boiler, identify the point of installation taking into account:
• the regulations;
• the overall size of the device;
• the position of the hydraulic and gas supply ttings;
• the size of the ue and air duct ttings (leave sufcient space to ensure ease of installation as illustrated in gure - type of
ttings A-B-C).
• installation of the boiler on a solid wall able to take the weight of the device with a full load of water and tted with any
accessories;
• installation of the boiler on a at wall (maximum permitted angle 1.5°).

7696306 (01-12/17) 16
INSTALLER Section (en)
min.
250
2,5
6
1000
285
700
395
min
140
min
170
min
290
A
B
C
BO-0000008
2,5
It is recommended that the dimensions, shown in mm in the gure according to the type of connection used (A, B or C) are
complied with in order to facilitate installation operations and removal of the ue gas connection on the boiler.
5.3.1 Data label and Service label
The data label is located inside the boiler near the top. To nd it, remove the
front panel of the boiler. The data label bears the main data of the device.
Refer to the example of the data label in the gure.
BO-0000010
Qn Hi
Pn 80/60°C
Pn 50/30°C
PMS
PMW
D
NOx
xx - xx
xx - xx
kW
kW
kW
kW
kW
kW
xx - xx
xx - xx
xx - xx
3 bar <95 °C
8 bar
xx l/min
x
3P - G31 - 37 mbar
2H - G20 - 20 mbar
XX
II
xxxxx
X
0085
xxx V ~ xx Hz - xx W - IP xx
x
7xxxxxx.xx
s/n: xxxxxxxxx
CN1=x CN2=x
“Code”
“Product name”
“ BRAND ”
Cxx..Cxx..Bxx..Bxx
"BRAND": Commercial brand
"Code": Product number
"Product name": Name of the product (model).
Qn Hi: Rated ow rate (lower heating value).
Pn: Power rating (ow 80 °C, return 60 °C).
PMS: Maximum pressure in heating circuit (bar).
PMW: Maximum pressure in DHW circuit (bar).
NOx: Nox Class.
IP: Electrical Protection.
Bxx/Cxx Appliance Category.
Appliance Type.
V-Hz-W: Electrical Supply.
CN1/CN2: Set of factory default parameters
"s/n": Serial number.
BO-0000009
“BRAND”
Qn Hi
Pn 80/60°C
Pn 50/30°C
PMS
PMW
D
NOx
4,9-24,7
4,8-24
kW
kW
kW
kW
kW
kW
4,9-20,6
4,8-20
5,2-21,8
3 bar <95 °C
8 bar
10,9 l/min
5
3P - G31 - 37 mbar
2H - G20 - 20 mbar
IT
II 2H3P
X
0085-
C
13
C
33
C
43
C
53
C
63
C
83
B
23
230 V~50 Hz - 84 W - IP X5D
72xxxxx.xx
s/n: 143800001
CN1=1 CN2=1
72xxxxx
“Product name”

17
INSTALLER Section (en)
7696306 (01-12/17)
The Service label is at the base of the cover of the terminal block under the
control panel, as shown in the gure to the side.
• "Code": Product number
• "Product name": Name of model
• "s/n": Serial number
BO-0000012
“Code”
“Product name”
“s/n”
5.3.2 Ventilation (for type B devices only)
Install a ventilation system in the boiler room to permit extraction of the combustion air. The size and location of the ventilation
system must be in compliance with the domestic laws in force.
5.4 Transport
Transport the packed device horizontally using suitable equipment. It is permitted to transport the boiler vertically using a two-
wheeled trolley only over short distances.
Two people are required to handle the boiler.
5.5 Unpacking/initial preparation
Do not hold the appliance by the siphon when lifting it or removing it from the packaging.
Unpack the boiler as follows:
• Put the boiler in its upright position (1);
• Remove the straps and strip of tape (2)-(3)-(4);
• Remove the accessories (5) then fasten the boiler xing bracket on the wall;
• Remove the polystyrene by pulling it upwards (6);
• Remove the cardboard by pulling it upwards (7);
• Remove the pre-cut polystyrene part from the bottom (8);
• "LIFT" the boiler holding it at points "a" and "b" (9);
• Attach the boiler to the bracket on the wall (9);
• Remove the polystyrene by pulling it downwards (10).
BO-0000011

7696306 (01-12/17) 18
INSTALLER Section (en)
BO-0000071
51 2 3 4
LIFT
10 6 7 8 9
b
a
LIFT
Do not leave any packaging (plastic bags, polystyrene, etc.) within the reach of children as they are a potential source of danger.
6. INSTALLATION
6.1 General
The boiler must be installed in accordance with the standards in force and the recommendations in this manual.
6.2 Preparation
After deciding the exact location of the boiler, x the template to the wall. Connect the system to the gas and water inlets. Make
sure the rear part of the boiler (back) is as parallel as possible to the wall (otherwise, shim the lower part). If you are either installing
the boiler on an existing system or replacing one, as well as the above, t a settling tank under the boiler on the system return line
in order to collect any deposits and scale circulating in the system after ushing. After xing the boiler on the wall, connect the ue
and air ducts. Connect the siphon to a drain trap, making sure the slope is continuous. Avoid horizontal stretches.
It is prohibited to keep ammable products and materials near the boiler or in the same room, even for short periods.
The boiler must be installed in a room protected against frost. Make sure that the boiler is installed near a connection to the
mains drainage system for draining the condensate. In case is installing the unit in environments with temperatures lower than
0°C, take the necessary precautions to avoid the formation of ice in the siphon and in the condensation drain.

19
INSTALLER Section (en)
7696306 (01-12/17)
6.2.1 Wall installation
Cover the boiler to protect it against dust produced during drilling in the wall.
Establish its exact position on the wall (see the wall template in paragraph 3.3) and install it as follows:
• Identify the points at which to drill the xing holes in the wall and check that they are level, and drill the holes using a Ø 8 mm
tip (1).
• Insert the Ø 8 mm dowels and x the bracket to the wall using Ø 6 mm screws and washers (2).
• Lift the boiler (two people are required to do this) and position it on the wall at the point of the hooks on the supporting bracket
(3).
• Make sure that the boiler is positioned vertically, and that the maximum deviation does not exceed 15 mm as shown in gure
(4).
BO_0000051
1
2
3
4
0 ÷ 15 mm
0 ÷ 15 mm
Cod.721373402
8
Ø
395
31,4
3/4" 1/2" 3/4"
1/2"
3/4"
3433,5 6565656567,5
100,7
147,5
=
=402
198 198
19,2
700
4020,5
64
80
50 MIN
82,5
37,7
150,7
77
158,3
Ø
116MIN
Ø
116MIN
255
29,5
31,5
10
120
22
Ø
58,8
35
0
÷15mm
0
÷15mm
1234
6.2.2 Access to the boiler's electrical connection board.
To access the electrical connection board, undo the two screws under the cover of the front panel as shown in the gure.
BO-0000014
6.2.3 Access to the internal components of the boiler
To access the components of the boiler remove the front panel by undoing the two clips C1-C2 under the boiler as illustrated in
the gure.

7696306 (01-12/17) 20
INSTALLER Section (en)
C1
C2
BO-0000015
6.2.4 Installation of the external sensor (accessory available on request)
It is important to choose a point where the sensor can detect the external conditions in a correct and efcient manner. Recommended
locations (A):
• On a side of the area to be heated, possibly facing north. At mid-height of the area to be heated.
• Out of direct sunlight. In an area that is easy to access.
Locations not recommended (B):
• Isolated by a structural element of the building (balcony, roof, etc.).
• Near a source of heat that could cause interference (direct sunlight, ue pipe, ventilation grille, etc.).
MW-8800N001-2
21
H
1/2 H (min. 2,5 m)
1/2 H (min. 2,5 m)
1/2 Z
H
Z21
21
A
MW-8800N002-1
B
Refer to chapters 6.6 and 9.1 on how to make the electrical connection and set the parameters.
The external sensor is not included in supply but is available separately upon request.