Arca Caldaie PIXEL MX Series User manual

INSTALLAZIONE, MANUTENZIONE, USO
CALDAIE MURALI A GAS
PIXEL MX
12/20 20/25 - 25/30 - 30/35 - 35/35
PN
Caldaie a condensazione
Gas Naturale (G20) Cat. ll2H3P ll2HMJP (20 mbar)
GPL (G31) Cat. ll2H3P ll2HMJP (37 mbar)
La prima accensione della caldaia e la convalida della garanzia devono essere eseguite da un tecnico qualificato
LIB1800P2 - Rev. 1 - 2/04/2019 - 52 pages
Instructions for Use
Installation and Servicing. To be left with the user
HIGH EFFICIENCY CONDENSING
COMBINATION BOILER
Natural Gas (G20) Cat. ll2H3P ll2HMJP (20 mbar)
GPL (G31) Cat. ll2H3P ll2HMJP (37 mbar)
LIB1800P2 - Rev2 - 22/5/2019 - 66 pages

2

3
HIGH EFFICIENCY CONDENSING BOILER
FOR CENTRAL HEATING AND DOMESTIC HOT WATER
This new highly efcient turbo-modulating boiler is designed to meet domestic hot water and central heating requirements at
super high efciency.
POSITION
The appliance is extremely versatile as it can be tted in almost any room. The appliance is room sealed so there is no contact
between the combustion chamber and living accommodation. This guarantees maximum safety and efciency. Each boiler
has been designed and manufactured in our modern plant to exacting ISO 9001 discipline, all boilers carry full CE marking of
approval. This product is guaranteed by ARCA CALDAIE S.R.L. Via I° Maggio, 16 46030 San Giorgio - Mantova- ITALY.
Guarantee is a full 24 months from date of purchase providing the appliance has been tted in accordance with these instructions
and relevant codes of practice.
- Modulating gas valve.
- Modulating pump head suitable for any type of central heating system.
- Burner with ame stabiliser designed to operate under all thermal conditions.
- Unique condensing heat exchanger for high thermal ue transfer from gases to water.
- Stainless steel plate heat exchanger for super high heat transfer to domestic hot water supply.
- Built in frost protection.
- Printed circuit board designed to connect to room stat and/or timer.
- Aesthetically pleasing panels and controls.
- On/Off ball valves for shutting off gas, central heating and domestic hot water circuit.
- Safety relief valve (for safety discharge).
-
NOTE: Due to the high efciency of this boiler a plume of water vapour will form at the ue
terminal during operation.
COSHH - CONTROL OF SUBSTANCES HAZARDOUS TO HEALTH
IMPORTANT
It is the Users/Installers responsibility to ensure that the necessary personal protective clothing is worn when
handling this appliance, and where applicable the pertinent parts that contain any materials that could be interpreted
as being injurious to health and safety.
GENERAL INFORMATION:
GLUES AND SEALANTS - exercise caution - if these are still in liquid form.
Arca use only high quality material for production of this product, in an effort to protect the environment wherever
possible components should be recycled.
WARNING: when installing the appliance, care should be taken to avoid any possibility of injury when handling sheet
metal parts.
MAJOR COMPONENTS

4
Users instructions
Sections Page Sections
1 Users guide 6 5 Installation
1.1 Introduction 6 5.1 Warning
1.2 Clearances around the appliance 6 5.2 Delivery
1.3 Operating safety checks to protect 6 5.3 Unpacking of boiler
your appliance (checking the system 5.4 Positioning of the boiler
pressure) 5.5 Flue terminal position
1.4 Control panel 7 5.6 Optional extras
5.7 Plume management kit
5.8 Installing the appliance for rear flue
outlet
5.9 Installing the appliance for side flue
2 General layout 9 outlet
Template drawing
2.1 Operating scheme 10
5.10 Completing horizontal flue installation
2.2 Introduction 11
5.11 Intake and exhaust terminal
2.3 Description of control system and 11 components
sequence of operation
5.12 In-line flue bend and flue extension
2.4 Domestic hot water mode 11 5.13 Vertical flue instructions
2.5 Central heating mode 11
5.14 Installation instructions for twin flue
2.6 General function 11 pipe
2.7 Overall dimension 12 5.15 Twin flue instructions
2.8 Safety device 12
5.16 Exhaust / suction system with
2.9 Available pump head 12
concentric pipes for flat or sloping
roofs.
3 Technical data PIXEL MX 20/25 PN Nat gas 13
Extensions with two separate pipes
3.1 Technical data PIXEL MX 20/25 PN LPG 14
5.17 Exhaust / suction system with two
3.2 Technical data PIXEL MX 25/30 PN Nat gas 15
separate rated 80 dia. pipes
3.3 Technical data PIXEL MIX 25/30 PN LPG 16
exhaust on flat or sloping roof, suction
3.4 Technical data PIXEL MIX 30/35 PN Nat gas 17
from vertical wall
3.5 Technical data PIXEL MIX 30/35 PN LPG 18
5.18 Exhaust / suction system with two
3.6 Technical data PIXEL MIX 35/35 PN Nat gas 19
separate pipes through a single
3.7 Technical data PIXEL MIX 35/35 PN LPG 20 vertical wall
5.19 Installation instructions for 80/125
4 General requirements 21 concentric flue system
4.1 Safety 21 5.20 Assemble boiler
Gas safety (Installation and use) 5.21 Fitting valve pack
4.2 General information 21 5.22 Gas connection
4.3 Location of boiler 22
5.23 Central heating connection
4.4 Clearances around the appliance 22
5.24 Domestic hot water connection
4.5 Important notice 22
5.25 Position of water/gas connections
4.6 Gas supply 22 5.26 Safety valve discharge
4.7 Flue system 23
5.27 Condensate drain connection
4.8 Air supply 23
5.28 External controls
4.9 Water circulation (central heating) 23 5.29 Outdoor sensor
4.10 Pipework 24
4.11 Boiler interlock control 24 6 Commissioning
4.12 Draining tap 24 6.1 Gas supply installation
4.13 Air release points 25 6.2 Electrical installation
4.14 Mains water feed: central heating 25 6.3 Initial filling of the system
4.15 Sizing of additional expansion vessel 26
6.4 Setting the heating system
4.16 Installation to an existing central 26 design pressure
heating system
6.5 Filling the hot water system
4.17 Water treatment 26 6.6 Lighting the boiler
4.18 Hard water areas 27 6.8 Check the gas pressure
4.19 Domestic water 27
4.20 Electrical supply 27

5
Sections Page Sections Page
6.9 Combustion check 44 10 Electrical system diagram 57
6.10 Checking the flue system 45
6.11 Checking the heating thermostat 45 11 Spare parts exploded views 60
6.12 Testing/regulating the D.H.W flow 45
6.13 Keep hot 45
6.14 C.H. high/low temperature 45
6.15 Range rating central heating or/and 46
domestic hot water
6.16 Test mode 46
6.17 Instructing the user 46
7 Servicing instructions 47
7.1 Boiler frost protection 47
7.2 To inspect and clean the appliance 48
8 Replacements of parts 49
8.1 General 49
8.2 To remove the boiler panels 49
8.3 To remove left and right panels 49
8.4 To remove/replace fan 49
8.5 To remove/replace the electrodes 50
8.6 To remove/replace the burner 50
8.7 To remove/replace the heat 50
exchanger
8.8 To remove/replace expansion 51
vessel
8.9 To remove/replace gas valve
51
8.10 To remove/replace plate heat 51
exchanger
8.11 To remove/replace the water 51
pressure transducer
8.12 To remove/replace diverter valve 52
motor
8.13 To remove/replace C.H. diverter 52
valve
8.14 To remove/replace D.H.W. diverter 52
valve mechanism
8.15 To remove/replace pump 52
8.16 To remove/replace automatic air vent 52
8.17 To remove/replace safety relief valve 53
8.18 To remove/replace D.H.W. sensor 53
8.19 To remove/replace C.H. flow and 53
return sensors
8.20 To remove/replace flue sensor 53
8.21 To clean and remove/replace 53
condensing trap
8.22 To remove control box 54
8.23 To remove/replace control board 54
8.24 To remove/replace digital display 54
board
8.25 External control connection 54
9 Fault finding Central heating 55
9.1 Log of the errors 56
9.2 Fault finding domestic hot water 56

6
It is the law that all gas appliances are installed by
a competent person, in accordance with the gas
safety installation and to the current Gas Safety
(Installation and Use) Regulations B.S.5440:2-(2009).
Do NOT search for gas leaks with a naked ame.
WARNING: This appliance must be earthed.
1.1 INTRODUCTION
Please carefully read the information given in this
booklet to help you gain maximum control from your
appliance with minimum trouble and cost.
Your Arca Condensing Low Nox combination boiler
has been designed to supply your Central Heating and
Domestic Hot Water directly from one unit.
When Central Heating is operating, the circulation will be
interrupted when Domestic Hot Water is being drawn off
(domestic hot water has priority).
This will normally not affect the level of Heating.
PLEASE NOTE:
Due to the high efciency of this appliance and resulting
low ue gas exhaust temperature a white plume of
condensation vapour (cool steam) will be emitted from the
ue outlet terminal, this is quite normal. It will be
particularly evident during periods of low outdoor
temperature or when the boiler is working at its optimum
performance (Plume Management kits are available on
request).
IMPORTANT:
In the unlikely event of the exhaust ue gases exceeding
the overheat temperature setting, the boiler operation will
be stopped to prevent damage to the appliance.
1.2 CLEARANCES AROUND THE APPLIANCE
Side clearance:
The position of the appliance must provide a
minimum clearance of only 5 mm as the side panels
do not require removing for servicing.
However, if the option is preferred to remove the
panels then a minimum clearance of 55 mm is
required.
Top clearance:
The top clearance should be a minimum of
125 mm.
Bottom clearance:
A minimum bottom clearance of 80 mm is
required between the appliance and any surface,
though 150 mm is preferred whenever
possible.
Front clearance:
A minimum of 450 mm is required in front of
the appliance for access during servicing, the
front clearance can be reduced when installed
in a cupboard to 25 mm from the access door.
+
USER CONTROLS
This appliance is designed to operate with the minimum
of ease for the user. All the controls are found on the
control panel on the front of the boiler.
1.3 OPERATING SAFETY CHECKS TO PROTECT
YOUR APPLIANCE (CHECKING THE SYSTEM
PRESSURE)
Before lighting the appliance check that the Central
Heating system pressure is not less than 1 bar. If it
is below this it will be necessary to re-pressurise the
system, between 1 and 1.5 bar to allow the boiler to
operate. To view the system pressure press the INFO
button once, this will display the current pressure (if the
pressure is on nil or too low, then error code 08E is
displayed).
A lling device (lling loop) will have been tted on the
system.
This is usually on the pipework near to the boiler. If you
are unsure of its position, or you cannot identify it, consult
the installer who tted the boiler.
The lling loop usually consists of two taps and a
separate silver coloured braided exible pipe with
connection ttings. Only when re-pressurising should the
braided exible pipe be connected between the two taps,
ensure that the nuts or the pipe ends are tightened
onto the taps.
Fully open one of the taps rst and then while monitoring
the water pressure on the digital display, carefully open
the second tap. When the water pressure is to a
maximum of 1.5 bar turn both taps off.
Disconnect the exible pipe from the taps (a small
amount of water may be present).
Keep the pipe in a safe place for future use.
Press the ESC button once to return to the main screen.
In the event of an error, the appliance will show a
sequence code displayed on the digital display of the
control panel (g. 1). By pressing the “RESET“
button it is possible to relight the boiler (see page 52
and 53 for list of error codes).
1 USERS GUIDE

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9
1.2 CONTROL PANEL
1 - ON/OFF.
Push button 1 to select the following
functions:
Summer, only sanitary water mode,
Winter; sanitary and heating mode
OFF, boiler off
2 - RESET/ESC
3/4 - HEATING
Sliding buttons.
Push to select the water value of the
heating delivery and/or choose the several
regulationsfrom other functions
5/6 - SANITARIO
Push to select the value of the wished
temperature of the sanitary water.
2/6 - INFO
Push the buttons 2 and 6 simultaneously for
3 seconds to visualize the operating values
of the boiler.
Push the sliding buttons 3 and 4 to visualize
the following data:
-0- = Temperature of delivery (°C);
-1- = Temperature of Sanitary (°C);
-2- = Boiler’s power (%);
-3- = Temperature of return (°C)
-4- =outdoor probe temperature (if present);
-5- = Real speed of the fan (rpm/100);
-6- = Frequency read by the sanitary
fluxmeter (Hz);
-7- = Smokes temperature;
-8- = Sanitary water capacity (l/min)
Push Reset to exit from INFO
1/2 - TEST/CHIMNEY SWEEPER
Push the buttons 1 and 2 simultaneously for
3 seconds.
Push the button 4 for operation at maximum
power and 3 for operation at minimum power.
the test function will itself automatically
deactivated after 15 min if buttons 3 and 4
are not pushed.
To exit before, push button 2 ESC.
2/4 - PROGRAMMING
Push the buttons 2 and 4 simultaneously for
3 seconds.
Push the sliding buttons 3 and 4 to select the
following functions:
P001: Maximum fan speed on heating mode.
P002: Maximum fan speed on sanitary mode.
P003: Sanitary pre-heating (“0” Off e “1” On).
Fig. 3
P004 high or low heating temperature Setting: “0”
low (max 50°C) and “1” (max “80”).
P005: External compensation regulation (default 20)
P006: Circulator anti-blockage: “0” Off and “1” On
P009: Ignition Power. It is possible adjust the
percentage of the power, during the ignition,
between 0 and 99%.
P0010: Boiler model
(“1” Pixel 20/25 - “2” Pixel 25/30
“3” Pixel 30/35 - “4” Pixel 35/35).
P0011: Boiler type
1 = sanitary/heating combi with 2 sensors,
2 = sanitary/heating combi with 1 sensor,
3 = heating and water storage tank,
4 = heating and water storage tank,
with timer
= METAN 2 = GPL
P0013: circulator type selector
1 = WILO/Shinhoo;
2 = GRUNDFOS;
P0014: Smokes probe
0 = Off;
1 = On;
DISPLAY
Pic. 4
1 - When the boiler is working on sanitary mode, the
icon 1 flashes
2 - Boiler fault alarm, an error code will be
visualized
3 - When the boiler is working in heating mode, icon
3flashes..
4 - boiler blockage due to an anomaly: push button
2 of Reset after fixing the anomaly detected.
5 - When the boiler is working, icon 5 flashes.
6 - Boiler info visualization.

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9
1.2 CONTROL PANEL
1 - ON/OFF.
Push button 1 to select the following
functions:
Summer, only sanitary water mode,
Winter; sanitary and heating mode
OFF, boiler off
2 - RESET/ESC
3/4 - HEATING
Sliding buttons.
Push to select the water value of the
heating delivery and/or choose the several
regulationsfrom other functions
5/6 - SANITARIO
Push to select the value of the wished
temperature of the sanitary water.
2/6 - INFO
Push the buttons 2 and 6 simultaneously for
3 seconds to visualize the operating values
of the boiler.
Push the sliding buttons 3 and 4 to visualize
the following data:
-0- = Temperature of delivery (°C);
-1- = Temperature of Sanitary (°C);
-2- = Boiler’s power (%);
-3- = Temperature of return (°C)
-4- =outdoor probe temperature (if present);
-5- = Real speed of the fan (rpm/100);
-6- = Frequency read by the sanitary
fluxmeter (Hz);
-7- = Smokes temperature;
-8- = Sanitary water capacity (l/min)
Push Reset to exit from INFO
1/2 - TEST/CHIMNEY SWEEPER
Push the buttons 1 and 2 simultaneously for
3 seconds.
Push the button 4 for operation at maximum
power and 3 for operation at minimum power.
the test function will itself automatically
deactivated after 15 min if buttons 3 and 4
are not pushed.
To exit before, push button 2 ESC.
2/4 - PROGRAMMING
Push the buttons 2 and 4 simultaneously for
3 seconds.
Push the sliding buttons 3 and 4 to select the
following functions:
P001: Maximum fan speed on heating mode.
P002: Maximum fan speed on sanitary mode.
P003: Sanitary pre-heating (“0” Off e “1” On).
Fig. 3
P004 high or low heating temperature Setting: “0”
low (max 50°C) and “1” (max “80”).
P005: External compensation regulation (default 20)
P006: Circulator anti-blockage: “0” Off and “1” On
P009: Ignition Power. It is possible adjust the
percentage of the power, during the ignition,
between 0 and 99%.
P0010: Boiler model
(“1” Pixel 20/25 - “2” Pixel 25/30
“3” Pixel 30/35 - “4” Pixel 35/35).
P0011: Boiler type
1 = sanitary/heating combi with 2 sensors,
2 = sanitary/heating combi with 1 sensor,
3 = heating and water storage tank,
4 = heating and water storage tank,
with timer
= METAN 2 = GPL
P0013: circulator type selector
1 = WILO/Shinhoo;
2 = GRUNDFOS;
P0014: Smokes probe
0 = Off;
1 = On;
DISPLAY
Pic. 4
1 - When the boiler is working on sanitary mode, the
icon 1 flashes
2 - Boiler fault alarm, an error code will be
visualized
3 - When the boiler is working in heating mode, icon
3flashes..
4 - boiler blockage due to an anomaly: push button
2 of Reset after fixing the anomaly detected.
5 - When the boiler is working, icon 5 flashes.
6 - Boiler info visualization.
9
1.2 CONTROL PANEL
1 - ON/OFF.
Push button 1 to select the following
functions:
Summer, only sanitary water mode,
Winter; sanitary and heating mode
OFF, boiler off
2 - RESET/ESC
3/4 - HEATING
Sliding buttons.
Push to select the water value of the
heating delivery and/or choose the several
regulationsfrom other functions
5/6 - SANITARIO
Push to select the value of the wished
temperature of the sanitary water.
2/6 - INFO
Push the buttons 2 and 6 simultaneously for
3 seconds to visualize the operating values
of the boiler.
Push the sliding buttons 3 and 4 to visualize
the following data:
-0- = Temperature of delivery (°C);
-1- = Temperature of Sanitary (°C);
-2- = Boiler’s power (%);
-3- = Temperature of return (°C)
-4- =outdoor probe temperature (if present);
-5- = Real speed of the fan (rpm/100);
-6- = Frequency read by the sanitary
fluxmeter (Hz);
-7- = Smokes temperature;
-8- = Sanitary water capacity (l/min)
Push Reset to exit from INFO
1/2 - TEST/CHIMNEY SWEEPER
Push the buttons 1 and 2 simultaneously for
3 seconds.
Push the button 4 for operation at maximum
power and 3 for operation at minimum power.
the test function will itself automatically
deactivated after 15 min if buttons 3 and 4
are not pushed.
To exit before, push button 2 ESC.
2/4 - PROGRAMMING
Push the buttons 2 and 4 simultaneously for
3 seconds.
Push the sliding buttons 3 and 4 to select the
following functions:
P001: Maximum fan speed on heating mode.
P002: Maximum fan speed on sanitary mode.
P003: Sanitary pre-heating (“0” Off e “1” On).
Fig. 3
P004 high or low heating temperature Setting: “0”
low (max 50°C) and “1” (max “80”).
P005: External compensation regulation (default 20)
P006: Circulator anti-blockage: “0” Off and “1” On
P009: Ignition Power. It is possible adjust the
percentage of the power, during the ignition,
between 0 and 99%.
P0010: Boiler model
(“1” Pixel 20/25 - “2” Pixel 25/30
“3” Pixel 30/35 - “4” Pixel 35/35).
P0011: Boiler type
1 = sanitary/heating combi with 2 sensors,
2 = sanitary/heating combi with 1 sensor,
3 = heating and water storage tank,
4 = heating and water storage tank,
with timer
= METAN 2 = GPL
P0013: circulator type selector
1 = WILO/Shinhoo;
2 = GRUNDFOS;
P0014: Smokes probe
0 = Off;
1 = On;
DISPLAY
Pic. 4
1 - When the boiler is working on sanitary mode, the
icon 1 flashes
2 - Boiler fault alarm, an error code will be
visualized
3 - When the boiler is working in heating mode, icon
3flashes..
4 - boiler blockage due to an anomaly: push button
2 of Reset after fixing the anomaly detected.
5 - When the boiler is working, icon 5 flashes.
6 - Boiler info visualization.

9
7
1
1 DISPOSIZIONE GENERALE
LEGENDA
1 - Mandata riscaldamento
2 - Rubinetto di carico
3 - Uscita acqua sanitario
4 - Ingresso gas
5 - Ingresso acqua
6 - Manometro
7 - Ritorno riscaldamento
8 - Scarico acqua
9 - Flussometro acqua sanitaria
10 - Circolatore
11 - Valvola sfiato aria automatica
12 - Valvola di sicurezza
13 - Pressostato di minima
14 - Sensore di mandata
15 - Sensore di ritorno
16 - Ventilatore
17 - Vaso di espansione
18 - Elettrodo di accensione
19 - Sensore fumi
20 - Scambiatore principale
21 - Elettrodo di rivelazione
22 - Scarico condensa
23 - Termostato limite di blocco
24 - Silenziatore aspirazione aria
25 - Attuatore valvola deviatrice
26 - Scambiatore a piastre
27 - Sifone
28 - Sensore acqua sanitaria
Fig. 1
1
2
3
4
5
6
7
8
11
12
13
15
17
18
18
20
21
22
23
27
10
9
26
16
14
24
25
28
2.0 GENERAL LAYOUT (Fig. 3)
Fig. 3
1 - C.H. ow
2 - Water load
3 - D.H.W. outlet
4 - Gas inlet
5 - Water inlet
6 - Pressure gauge
7 - C.H. return
8 - Drain point
9 - D.H.W. ow detector
10 - Pump
11 - Automatic air vent
12 - Safety pressure relief valve
13 - Water pressure
14 - C.H. flow sensor
15 - C.H. return sensor
16 - Fan
17 - Expansion vessel
18 - Spark electrode
19 - Flue temperature sensor
20 - Main heat exchanger
21 - Sensing electrode
22 - Condensate drain
23 - Overheat cut off thermostat
24 - Silencer
25 - Three-way valve motor
26 - Plate heat exchanger
27 - Condensate trap
28 - C.H. flow sensor

10
KEY
1 - Flue temperature sensor
2 - Main heat exchanger
3 - Sensing electrode
4 - Spark electrode
5 - CH return
6 - CH ow
7 - Condensate drain
8 - Fan
9 - CH return sensor
10 - Overheat cut off thermostat
11 - CH ow sensor
12 - Gas valve
13 - Expansion vessel
14 - Automatic air vent
15 - Pump
16 - Water pressure transducer
17 - Safety pressure system
18 - Diverter valve motor
19 - Plate heat exchanger
20 - DHW sensor
21 - DHW ow sensor
22 - Gas service cock
23 - CH compression ball valve
24 - DHW compression ball valve
25 - CH compression ball valve
2.1 OPERATING SCHEME (Fig. 4)
Fig. 4

When starting, the fan will always start at the
set-point speed.
The boiler is tted with an anti-cycling device
on the control board. This delays the boiler
from re-ring within 10 minutes.
If the heating temperature goes 20 °C below
the set point, the burner restarts immediately.
The domestic hot water will always take
priority and is unaffected by the anti-cycling
device.
2.6 GENERAL FUNCTION
The instrument panel allows adjustment of the
boiler to the heating requirements, between
the maximum and minimum settings.
Air and gas are drawn by the fan for
combustion. The fan also forces exhaust gas
through the ue to the outside, this creates
a lesser pressure in the sealed combustion
chamber, thus sucking in combustion air,
through the inlet duct.
The boiler water temperature is automatically
controlled by a built in thermostat.
Interior space temperature is set by the
room thermostat to be installed as part of the
heating system. The boiler already carries
connection terminals for this thermostat, as
well as for an external timer if required. The
burner continues to operate until it is stopped
by the digital clock or one of the thermostats.
When the internal CH temperature sensor
or the room thermostat intervenes the burner
shuts down. The fan stops but the pump
continues to operate for 3 minutes.
The boiler also incorporates an anti-block
system which powers the pump every 24
hours, allowing it to operate for 2 minutes if
the boiler has not been in use. This operation
may in some cases be heard for a short
period when the pump has been activated.
The heat exchanger in the DHW circuit is
a stainless steel plate heat exchanger water
to water, and domestic water is heated by
converting the water in the central heating
circuit. The transfer of heat is very high
because the two uids move in a counter
direction.
Select the winter position by pressing the
ON/OFF button (item 1 g. 1).
When a hot water tap is turned on the
diverter valve motor moves to exclude the
central heating circuit, the boiler
automatically modulates to maintain the
domestic hot water at a constant temperature.
The water temperature can be regulated by
the digital display.
2.2 INTRODUCTION
This boiler is designed for the production of
central heating and domestic hot water
combined in one unit.
It is tted with an automatic domestic hot
water priority valve.
It is possible to select either a summer or
winter function with the summer position
only being for domestic hot water.
The winter position being for central heating
with domestic hot water priority.
2.3 DESCRIPTION OF CONTROL SYSTEM
AND SEQUENCE OF OPERATION
2.4 Domestic hot water mode
When the appliance is in rest mode, select
the summer position by pressing the ON/OFF
button (item 1 g. 1) please ensure that the
heating circuit is charged with water (above 1
bar).
If the domestic hot water tap is turned on, the
boiler will function in the following sequence:
The pump starts. The fan starts and sends a
signal back to the ignition board that the fan is
running.
The spark ignition system is powered which in
turn commences the spark igniter to operate
and light the burner.
At this point the ignition board opens the gas
valve to light the burner.
When the electrode sensor senses the signal
that the burner is alight, the spark igniter
stops.
The fan speed settings on the boiler increases
to the maximum permissible speed over
a period of 5 seconds and will remain at its
maximum required power until its maximum
regulated temperature is achieved and then
will modulate to maintain this.
When the domestic hot water tap is closed the
diverter valve goes back into rest mode, the
burner is shut down along with the fan which is
also switched off.
2.5 Central heating mode
If the appliance is in winter mode with a
demand for heat to supply radiators, etc. ,
with the heating circuit fully charged above
1 bar, so as to operate the low water sensor
device the boiler will start in the same way
as domestic hot water mode.
As the heating sensor reaches temperature
the fan speed modulates to maintain the
temperature set on the display panel.
11

12
When there is a demand for domestic hot
water, the burner and pump perform as
they do during central heating except that
the burner is commanded by the DHW
thermostat.
When DHW is no longer called for (tap is
turned off), the boiler will automatically return
to the central heating mode.
Select the summer position by pressing the
summer/winter button. The boiler functions
like an automatic gas hot water heater.
When DHW is no longer required the burner
and pump and fan will immediately turn off.
This also takes place when in winter mode,
if there is no demand for heat to the central
heating system or until the digital clock and
room thermostat (if tted) demands the
central heating circuit.
2.8 SAFETY DEVICE
In both central heating and domestic hot
water mode safe operation is ensured by a
control board which shuts off the main
burner, if the fan stops or the ue or
combustion air intake duct is obstructed.
An overheat cut off thermostat acts to turn
off the burner to resettable “lockout”.
A safety valve is tted on the central heating
circuit set at 3 bar.
A low water pressure switch set at 0.4 bar is
tted on heating circuit, to prevent the boiler
operating below this boiler system pressure.
2.7 OVERALL DIMENSION
(Fig. 5)
2.9 AVAILABLE PUMP HEAD
Fig. 5

Nominal heat Input net QMS 21.0 kW
Minimum heat Input net 3.7 kW
Nominal heat output 20.4 kW
Nominal heat output condensing 22.1 kW
Minimum heat output 3.5 kW
Minimum heat output condensing 3.9 kW
Inlet pressure 20 mbar Gas rate after 10 minutes Max 2.1 m3/h - min. 0.4 m3/h
Fan speed Max 5200 rpm - 173 Hz Combustion % CO2 : 9.0 (+ 0.5 / - 0.5) Case On
C.H. min 1200 rpm - 40 Hz 9.0 (+ 0.5 / - 0.5) Case Off
Electrical supply: 230 V ~ 50 Hz
External fuse rating: 3 A Internal fuse F1: 3.15 A (20 mm To BS 4265)
Dry weight : 31 Kg Water content C.H.: 0.8 Litre Water content D.H.W.: 0.2 Litre
Gas Supply Connection 3/4”
Flow connection C.H. 3/4
Return connection C.H. 3/4
Inlet connection D.H.W. 1/2”
Outlet connection D.H.W. 1/2”
Safety discharge C.H. 15 mm copper pipe
Condensation drain 21.5 mm push t over ow
Max cold water capacity without additional expansion vessel 110 Litre
Sealed water system C.H.
Max pressure PHS 2.5 bar
Minimum working pressure 0.5 bar
7 Litres expansion vessel pre-charge-pressure 0.5 bar
Central Heating operating temperature Max 80 °C min 35 °C
Design ow rate 1066 I/h 20 °C rise
Minimum ow rate C.H. 350 l/h
D.H.W. ow rate 30 °C rise 11.9 l/min
D.H.W. ow rate 35 °C rise 10.2 l/min
D.H.W. ow rate 40 °C rise 8.9 l/min 10°C Inlet temperature
D.H.W. temperature Max 60 °C min 35 °C
Fan speed D.H.W. Max 6200 rpm - 207 Hz min 1200 rpm - 40 Hz
Qmw Input Net Max 25.5 kW min 3.7 kW
D.H.W. Pressure Pmw Max 6.5 bar
D.H.W. Pressure Pmw min 0.8 bar
D.H.W. Minimum Flow Rate 2.1 I/min
Destination: GB, IE, ES, IT, GR, PL, CH, PT, HU Category: II2H3P - II2E3P
Flue Type: C13 - C33 - C53 - C63 - C83
Electrical protection index: IP X4 D
LWA sound power level, indoors 50.5 dB NOx class 6 - 24.40 mg/kWh
ErP D.H.W.
Seasonal space heating energy efciency class Water heating energy efciency class
µs seasonal space heating energy efciency 91.7 % Load Prole XL
Pn nominal heat input 21.0 kW µwh water heating energy efciency 85.1 %
P4 nominal heat output high temperature 20.4 kW Qfuel daily fuel consumption 22.774 kWh
P1 nominal heat output (30% Pn) low temperature 6.1 kW AFC Annual fuel consumption 17.284 GJ
Qelec daily electricity consumption 0.2046 kWh
AEC annual electricity consumption 44.802 kWh
µ4 efciency at nominal heat output high temperature 87.3 %
µ1 efciency at 30% nominal heat output low temperature 97.0 %
Auxiliary electricity consumption:
elmax at full load 0.034 kW PSB in standby mode 0.005 kW
elmin at part load 0.016 kW Pstby standby heat loss 0.028 kW
3TECHNICAL DATA
PIXEL MX 20/25 PN
TABLE A
NATURAL GAS (G 20) II2H3P - II2E3P
13

3.1 TECHNICAL DATA
PIXEL MX 20/25 PN
TABLE B
LPG ( G 31) II2H3P - II2E3P
14
Nominal heat Input net QMS 21.0 kW
Minimum heat Input net 3.7 kW
Nominal heat output 20.4 kW
Nominal heat output condensing 22.1 kW
Minimum heat output 3.5 kW
Minimum heat output condensing 3.9 kW
Inlet pressure 37 mbar Gas rate after 10 minutes Max 0,8 m3/h - min. 0,15 m3/h
Fan speed Max 5200 rpm - 167 Hz Combustion % CO2 : 10.5 (+ 0.5 / - 0.5) Case On
C.H. min 1200 rpm - 40 Hz 10.5 (+ 0.5 / - 0.5) Case Off
Electrical supply: 230 V ~ 50 Hz
External fuse rating: 3 A Internal fuse F1: 3.15 A (20 mm To BS 4265)
Dry weight : 31 Kg Water content C.H.: 0.8 Litre Water content D.H.W.: 0.2 Litre
Gas Supply Connection 3/4”
Flow connection C.H. 3/4
Return connection C.H. 3/4
Inlet connection D.H.W. 1/2”
Outlet connection D.H.W. 1/2”
Safety discharge C.H. 15 mm copper pipe
Condensation drain 21.5 mm push t over ow
Max cold water capacity without additional expansion vessel 110 Litre
Sealed water system C.H.
Max pressure PHS 2.5 bar
Minimum working pressure 0.5 bar
7 Litres expansion vessel pre-charge-pressure 0.5 bar
Central Heating operating temperature Max 80 °C min 35 °C
Design ow rate 1066 I/h 20 °C rise
Minimum ow rate C.H. 350 l/h
D.H.W. ow rate 30 °C rise 11.9 l/min
D.H.W. ow rate 35 °C rise 10.2 l/min
D.H.W. ow rate 40 °C rise 8.9 l/min 10°C Inlet temperature
D.H.W. temperature Max 60 °C min 35 °C
Fan speed D.H.W. Max 6000 rpm - 200 Hz min 1200 rpm - 40 Hz
Qmw Input Net Max 25.5 kW min 3.7 kW
D.H.W. Pressure Pmw Max 6.5 bar
D.H.W. Pressure Pmw min 0.8 bar
D.H.W. Minimum Flow Rate 2.1 I/min
Destination: GB, IE, ES, IT, GR, PL, CH, PT, HU Category: II2H3P - II2E3P
Flue Type: C13 - C33 - C53 - C63 - C83
Electrical protection index: IP X4 D
LWA sound power level, indoors 50.5 dB NOx class 6 - 24.40 mg/kWh
ErP D.H.W.
Seasonal space heating energy efciency class Water heating energy efciency class
µs seasonal space heating energy efciency 91.7 % Load Prole XL
Pn nominal heat input 21.0 kW µwh water heating energy efciency 85.1 %
P4 nominal heat output high temperature 20.4 kW Qfuel daily fuel consumption 22.774 kWh
P1 nominal heat output (30% Pn) low temperature 6.1 kW AFC Annual fuel consumption 17.284 GJ
Qelec daily electricity consumption 0.2046 kWh
AEC annual electricity consumption 44.802 kWh
µ4 efciency at nominal heat output high temperature 87.3 %
µ1 efciency at 30% nominal heat output low temperature 97.0 %
Auxiliary electricity consumption:
elmax at full load 0.034 kW PSB in standby mode 0.005 kW
elmin at part load 0.016 kW Pstby standby heat loss 0.028 kW

15
3.2 TECHNICAL DATA
TABLE C PIXEL MX 25/30 PN
NATURAL GAS (G 20) II2H3P - II2E3P
Nominal heat Input net QMS 25.0 kW
Minimum heat Input net 4.0 kW
Nominal heat output 24.3 kW
Nominal heat output condensing 26.4 kW
Minimum heat output 3.7 kW
Minimum heat output condensing 4.2 kW
Inlet pressure 20 mbar Gas rate after 10 minutes Max 2.6 m3/h - min. 0.4 m3/h
Fan speed Max 5400 rpm - 180 Hz Combustion % CO2 : 9.0 (+ 0.5 / - 0.5) Case On
C.H. min 1200 rpm - 40 Hz 9.0 (+ 0.5 / - 0.5) Case Off
Electrical supply: 230 V ~ 50 Hz
External fuse rating: 3 A Internal fuse F1: 3.15 A (20 mm To BS 4265)
Dry weight : 32 Kg Water content C.H.: 0.8 Litre Water content D.H.W.: 0.2 Litre
Gas Supply Connection 3/4”
Flow connection C.H. 3/4
Return connection C.H. 3/4
Inlet connection D.H.W. 1/2”
Outlet connection D.H.W. 1/2”
Safety discharge C.H. 15 mm copper pipe
Condensation drain 21.5 mm push t over ow
Max cold water capacity without additional expansion vessel 110 Litre
Sealed water system C.H.
Max pressure PHS 2.5 bar
Minimum working pressure 0.5 bar
8 Litres expansion vessel pre-charge-pressure 0.5 bar
Central Heating operating temperature Max 80 °C min 35 °C
Design ow rate 1811 I/h 20 °C rise
Minimum ow rate C.H. 350 l/h
D.H.W. ow rate 30 °C rise 14.0 l/min
D.H.W. ow rate 35 °C rise 12.0 l/min
D.H.W. ow rate 40 °C rise 10.5 l/min 10°C Inlet temperature
D.H.W. temperature Max 60 °C min 35 °C
Fan speed D.H.W. Max 6600 rpm - 220 Hz min 1200 rpm - 40 Hz
Qmw Input Net Max 31.0 kW min 4.0 kW
D.H.W. Pressure Pmw Max 6.5 bar
D.H.W. Pressure Pmw min 0.8 bar
D.H.W. Minimum Flow Rate 2.1 I/min
Destination: GB, IE, ES, IT, GR, PL, CH, PT, HU Category: II2H3P - II2E3P
Flue Type: C13 - C33 - C53 - C63 - C83
Electrical protection index: IP X4 D
LWA sound power level, indoors 52 dB NOx class 6 - 36.06 mg/kWh
ErP D.H.W.
Seasonal space heating energy efciency class Water heating energy efciency class
µs seasonal space heating energy efciency 92.0 % Load Prole XL
Pn nominal heat input 25.0 kW µwh water heating energy efciency 84.86 %
P4 nominal heat output high temperature 24.3 kW Qfuel daily fuel consumption 22.991 kWh
P1 nominal heat output (30% Pn) low temperature 7.9 kW AFC Annual fuel consumption 17.415 GJ
Qelec daily electricity consumption 0.1533 kWh
AEC annual electricity consumption 33.564 kWh
µ4 efciency at nominal heat output high temperature 87.4 %
µ1 efciency at 30% nominal heat output low temperature 97.1 %
Auxiliary electricity consumption:
elmax at full load 0.034 kW PSB in standby mode 0.005 kW
elmin at part load 0.016 kW Pstby standby heat loss 0.028 kW

16
3.3 TECHNICAL DATA
TABLE D PIXEL MX 25/30 PN
LPG (G 31) II2H3P - II2E3P
Nominal heat Input net QMS 25.0 kW
Minimum heat Input net 4.0 kW
Nominal heat output 24.3 kW
Nominal heat output condensing 26.4 kW
Minimum heat output 3.7 kW
Minimum heat output condensing 4.2 kW
Inlet pressure 37 mbar Gas rate after 10 minutes Max 2.6 m3/h - min. 0.4 m3/h
Fan speed Max 5200 rpm - 173 Hz Combustion % CO2 : 10.5 (+ 0.5 / - 0.5) Case On
C.H. min 1200 rpm - 40 Hz 10.5 (+ 0.5 / - 0.5) Case Off
Electrical supply: 230 V ~ 50 Hz
External fuse rating: 3 A Internal fuse F1: 3.15 A (20 mm To BS 4265)
Dry weight : 32 Kg Water content C.H.: 0.8 Litre Water content D.H.W.: 0.2 Litre
Gas Supply Connection 3/4”
Flow connection C.H. 3/4
Return connection C.H. 3/4
Inlet connection D.H.W. 1/2”
Outlet connection D.H.W. 1/2”
Safety discharge C.H. 15 mm copper pipe
Condensation drain 21.5 mm push t over ow
Max cold water capacity without additional expansion vessel 110 Litre
Sealed water system C.H.
Max pressure PHS 2.5 bar
Minimum working pressure 0.5 bar
8 Litres expansion vessel pre-charge-pressure 0.5 bar
Central Heating operating temperature Max 80 °C min 35 °C
Design ow rate 1811 I/h 20 °C rise
Minimum ow rate C.H. 350 l/h
D.H.W. ow rate 30 °C rise 14.0 l/min
D.H.W. ow rate 35 °C rise 12.0 l/min
D.H.W. ow rate 40 °C rise 10.5 l/min 10°C Inlet temperature
D.H.W. temperature Max 60 °C min 35 °C
Fan speed D.H.W. Max 6400 rpm - 213 Hz min 1200 rpm - 40 Hz
Qmw Input Net Max 31.0 kW min 4.0 kW
D.H.W. Pressure Pmw Max 6.5 bar
D.H.W. Pressure Pmw min 0.8 bar
D.H.W. Minimum Flow Rate 2.1 I/min
Destination: GB, IE, ES, IT, GR, PL, CH, PT, HU Category: II2H3P - II2E3P
Flue Type: C13 - C33 - C53 - C63 - C83
Electrical protection index: IP X4 D
LWA sound power level, indoors 52 dB NOx class 6 - 36.06 mg/kWh
ErP D.H.W.
Seasonal space heating energy efciency class Water heating energy efciency class
µs seasonal space heating energy efciency 92.0 % Load Prole XL
Pn nominal heat input 25.0 kW µwh water heating energy efciency 84.86 %
P4 nominal heat output high temperature 24.3 kW Qfuel daily fuel consumption 22.991 kWh
P1 nominal heat output (30% Pn) low temperature 7.9 kW AFC Annual fuel consumption 17.415 GJ
Qelec daily electricity consumption 0.1533 kWh
AEC annual electricity consumption 33.564 kWh
µ4 efciency at nominal heat output high temperature 87.4 %
µ1 efciency at 30% nominal heat output low temperature 97.1 %
Auxiliary electricity consumption:
elmax at full load 0.034 kW PSB in standby mode 0.005 kW
elmin at part load 0.016 kW Pstby standby heat loss 0.028 kW

Nominal heat Input net QMS 29.0 kW
Minimum heat Input net 4.0 kW
Nominal heat output 28.3 kW
Nominal heat output condensing 30.5 kW
Minimum heat output 3.7 kW
Minimum heat output condensing 4.1 kW
Inlet pressure 20 mbar Gas rate after 10 minutes Max 3.1 m3/h - min. 0.4 m3/h
Fan speed Max 6200 rpm - 206 Hz Combustion % CO2 : 9.0 (+ 0.5 / - 0.5) Case On
C.H. min 1200 rpm - 40 Hz 9.0 (+ 0.5 / - 0.5) Case Off
Electrical supply: 230 V ~ 50 Hz
External fuse rating: 3 A Internal fuse F1: 3.15 A (20 mm To BS 4265)
Dry weight : 31 Kg Water content C.H.: 0.8 Litre Water content D.H.W.: 0.2 Litre
Gas Supply Connection 3/4”
Flow connection C.H. 3/4
Return connection C.H. 3/4
Inlet connection D.H.W. 1/2”
Outlet connection D.H.W. 1/2”
Safety discharge C.H. 15 mm copper pipe
Condensation drain 21.5 mm push t over ow
Max cold water capacity without additional expansion vessel 110 Litre
Sealed water system C.H.
Max pressure PHS 2.5 bar
Minimum working pressure 0.5 bar
10 Litres expansion vessel pre-charge-pressure 0.5 bar
Central Heating operating temperature Max 80 °C min 35 °C
Design ow rate 1250 I/h 20 °C rise
Minimum ow rate C.H. 350 l/h
D.H.W. ow rate 30 °C rise 16.2 l/min
D.H.W. ow rate 35 °C rise 13.8 l/min
D.H.W. ow rate 40 °C rise 12.1 l/min 10°C Inlet temperature
D.H.W. temperature Max 60 °C min 35 °C
Fan speed D.H.W. Max 7300 rpm - 243 Hz min 1200 rpm - 40 Hz
Qmw Input Net Max 36.0 kW min 4.0 kW
D.H.W. Pressure Pmw Max 6.5 bar
D.H.W. Pressure Pmw min 0.8 bar
D.H.W. Minimum Flow Rate 2.1 I/min
Destination: GB, IE, ES, IT, GR, PL, CH, PT, HU Category: II2H3P - II2E3P
Flue Type: C13 - C33 - C53 - C63 - C83
Electrical protection index: IP X4 D
LWA sound power level, indoors 50.5 dB NOx class 6 - 24.72 mg/kWh
ErP D.H.W.
Seasonal space heating energy efciency class Water heating energy efciency class
µs seasonal space heating energy efciency 93.2 % Load Prole XL
Pn nominal heat input 29.0 kW µwh water heating energy efciency 83.6 %
P4 nominal heat output high temperature 28.3 kW Qfuel daily fuel consumption 23.364 kWh
P1 nominal heat output (30% Pn) low temperature 9.5 kW AFC Annual fuel consumption 17.641 GJ
Qelec daily electricity consumption 0.1736 kWh
AEC annual electricity consumption 38.023 kWh
µ4 efciency at nominal heat output high temperature 87.8 %
µ1 efciency at 30% nominal heat output low temperature 97.0 %
Auxiliary electricity consumption:
elmax at full load 0.034 kW PSB in standby mode 0.005 kW
elmin at part load 0.016 kW Pstby standby heat loss 0.028 kW
3.4 TECHNICAL DATA
PIXEL MX 30/35 PN
TABLE E
NATURAL GAS (G 20) II2H3P - II2E3P
17

3.5 TECHNICAL DATA
TABLE F
PIXEL MX 30/35 PN
LPG ( G 31) II2H3P - II2E3P
Nominal heat Input net QMS 29.0 kW
Minimum heat Input net 4.0 kW
Nominal heat output 28.3 kW
Nominal heat output condensing 30.5kW
Minimum heat output 3.7 kW
Minimum heat output condensing 4.1 kW
Inlet pressure 37 mbar Gas rate after 10 minutes Max 1.1 m3/h - min. 0.4 m3/h
Fan speed Max 6000 rpm - 200 Hz Combustion % CO2 : 10.5 (+ 0.5 / - 0.5) Case On
C.H. min 1200 rpm - 40 Hz 10.5 (+ 0.5 / - 0.5) Case Off
Electrical supply: 230 V ~ 50 Hz
External fuse rating: 3 A Internal fuse F1: 3.15 A (20 mm To BS 4265)
Dry weight : 31 Kg Water content C.H.: 0.8 Litre Water content D.H.W.: 0.2 Litre
Gas Supply Connection 3/4”
Flow connection C.H. 3/4
Return connection C.H. 3/4
Inlet connection D.H.W. 1/2”
Outlet connection D.H.W. 1/2”
Safety discharge C.H. 15 mm copper pipe
Condensation drain 21.5 mm push t over ow
Max cold water capacity without additional expansion vessel 110 Litre
Sealed water system C.H.
Max pressure PHS 2.5 bar
Minimum working pressure 0.5 bar
10 Litres expansion vessel pre-charge-pressure 0.5 bar
Central Heating operating temperature Max 80 °C min 35 °C
Design ow rate 1250 I/h 20 °C rise
Minimum ow rate C.H. 350 l/h
D.H.W. ow rate 30 °C rise 16.2 l/min
D.H.W. ow rate 35 °C rise 13.8 l/min
D.H.W. ow rate 40 °C rise 12.1 l/min 10°C Inlet temperature
D.H.W. temperature Max 60 °C min 35 °C
Fan speed D.H.W. Max 7100 rpm - 236 Hz min 1200 rpm - 40 Hz
Qmw Input Net Max 36.0 kW min 4.0 kW
D.H.W. Pressure Pmw Max 6.5 bar
D.H.W. Pressure Pmw min 0.8 bar
D.H.W. Minimum Flow Rate 2.1 I/min
Destination: GB, IE, ES, IT, GR, PL, CH, PT, HU Category: II2H3P - II2E3P
Flue Type: C13 - C33 - C53 - C63 - C83
Electrical protection index: IP X4 D
LWA sound power level, indoors 50.5 dB NOx class 6 - 24.72 mg/kWh
ErP D.H.W.
Seasonal space heating energy efciency class Water heating energy efciency class
µs seasonal space heating energy efciency 93.2 % Load Prole XL
Pn nominal heat input 29.0 kW µwh water heating energy efciency 83.6 %
P4 nominal heat output high temperature 28.3 kW Qfuel daily fuel consumption 23.364 kWh
P1 nominal heat output (30% Pn) low temperature 9.5 kW AFC Annual fuel consumption 17.641 GJ
Qelec daily electricity consumption 0.1736 kWh
AEC annual electricity consumption 38.023 kWh
µ4 efciency at nominal heat output high temperature 87.8 %
µ1 efciency at 30% nominal heat output low temperature 97.0 %
Auxiliary electricity consumption:
elmax at full load 0.034 kW PSB in standby mode 0.005 kW
elmin at part load 0.016 kW Pstby standby heat loss 0.028 kW
18

3.6 TECHNICAL DATA
TABLE G PIXEL MX 35/35 PN
NATURAL GAS (G 20) II2H3P - II2E3P
Nominal heat Input net QMS 33.0 kW
Minimum heat Input net 4.0 kW
Nominal heat output 31.5 kW
Nominal heat output condensing 34.3 kW
Minimum heat output 3.6 kW
Minimum heat output condensing 4.02 kW
Inlet pressure 20 mbar Gas rate after 10 minutes Max 3.4 m3/h - min. 0.4 m3/h
Fan speed Max 6800 rpm - 180 Hz Combustion % CO2 : 9.0 (+ 0.5 / - 0.5) Case On
C.H. min 1200 rpm - 40 Hz 9.0 (+ 0.5 / - 0.5) Case Off
Electrical supply: 230 V ~ 50 Hz
External fuse rating: 3 A Internal fuse F1: 3.15 A (20 mm To BS 4265)
Dry weight : 32 Kg Water content C.H.: 0.8 Litre Water content D.H.W.: 0.2 Litre
Gas Supply Connection 3/4”
Flow connection C.H. 3/4
Return connection C.H. 3/4
Inlet connection D.H.W. 1/2”
Outlet connection D.H.W. 1/2”
Safety discharge C.H. 15 mm copper pipe
Condensation drain 21.5 mm push t over ow
Max cold water capacity without additional expansion vessel 110 Litre
Sealed water system C.H.
Max pressure PHS 2.5 bar
Minimum working pressure 0.5 bar
10 Litres expansion vessel pre-charge-pressure 0.5 bar
Central Heating operating temperature Max 80 °C min 35 °C
Design ow rate 1811 I/h 20 °C rise
Minimum ow rate C.H. 350 l/h
D.H.W. ow rate 30 °C rise 16,2 l/min
D.H.W. ow rate 35 °C rise 13.8 l/min
D.H.W. ow rate 40 °C rise 12.1 l/min 10°C Inlet temperature
D.H.W. temperature Max 60 °C min 35 °C
Fan speed D.H.W. Max 7800 rpm - 220 Hz min 1200 rpm - 40 Hz
Qmw Input Net Max 34,8 kW min 4.0 kW
D.H.W. Pressure Pmw Max 6.5 bar
D.H.W. Pressure Pmw min 0.8 bar
D.H.W. Minimum Flow Rate 2.1 I/min
Destination: GB, IE, ES, IT, GR, PL, CH, PT, HU Category: II2H3P - II2E3P
Flue Type: C13 - C33 - C53 - C63 - C83
Electrical protection index: IP X4 D
LWA sound power level, indoors 52 dB NOx class 6 - 19.42 mg/kWh
ErP D.H.W.
Seasonal space heating energy efciency class Water heating energy efciency class
µs seasonal space heating energy efciency 92.6 % Load Prole XL
Pn nominal heat input 33.0 kW µwh water heating energy efciency 83,65 %
P4 nominal heat output high temperature 31.5 kW Qfuel daily fuel consumption 23.339 kWh
P1 nominal heat output (30% Pn) low temperature 10.8 kW AFC Annual fuel consumption 17.626 GJ
Qelec daily electricity consumption 0.176 kWh
AEC annual electricity consumption 38.552 kWh
µ4 efciency at nominal heat output high temperature 86.0 %
µ1 efciency at 30% nominal heat output low temperature 97.9 %
Auxiliary electricity consumption:
elmax at full load 0.034 kW PSB in standby mode 0.005 kW
elmin at part load 0.016 kW Pstby standby heat loss 0.056 kW
0.033 kW
19

20
3.7 TECHNICAL DATA
TABLE H PIXEL MX 35/35 PN
LPG (G 31) II2H3P - II2E3P
Nominal heat Input net QMS 33.0 kW
Minimum heat Input net 4.0 kW
Nominal heat output 31.5 kW
Nominal heat output condensing 34.3 kW
Minimum heat output 3.6 kW
Minimum heat output condensing 4.0 kW
Inlet pressure 37 mbar Gas rate after 10 minutes Max 1.4 m3/h - min. 0.4 m3/h
Fan speed Max 6600 rpm - 173 Hz Combustion % CO2 : 10.5 (+ 0.5 / - 0.5) Case On
C.H. min 1200 rpm - 40 Hz 10.5 (+ 0.5 / - 0.5) Case Off
Electrical supply: 230 V ~ 50 Hz
External fuse rating: 3 A Internal fuse F1: 3.15 A (20 mm To BS 4265)
Dry weight : 32 Kg Water content C.H.: 0.8 Litre Water content D.H.W.: 0.2 Litre
Gas Supply Connection 3/4”
Flow connection C.H. 3/4
Return connection C.H. 3/4
Inlet connection D.H.W. 1/2”
Outlet connection D.H.W. 1/2”
Safety discharge C.H. 15 mm copper pipe
Condensation drain 21.5 mm push t over ow
Max cold water capacity without additional expansion vessel 110 Litre
Sealed water system C.H.
Max pressure PHS 2.5 bar
Minimum working pressure 0.5 bar
7 Litres expansion vessel pre-charge-pressure 0.5 bar
Central Heating operating temperature Max 80 °C min 35 °C
Design ow rate 1811 I/h 20 °C rise
Minimum ow rate C.H. 350 l/h
D.H.W. ow rate 30 °C rise 16,2 l/min
D.H.W. ow rate 35 °C rise 13.8 l/min
D.H.W. ow rate 40 °C rise 12.1 l/min 10°C Inlet temperature
D.H.W. temperature Max 60 °C min 35 °C
Fan speed D.H.W. Max 7300 rpm - 213 Hz min 1200 rpm - 40 Hz
Qmw Input Net Max 34,8 kW min 4.0 kW
D.H.W. Pressure Pmw Max 6.5 bar
D.H.W. Pressure Pmw min 0.8 bar
D.H.W. Minimum Flow Rate 2.1 I/min
Destination: GB, IE, ES, IT, GR, PL, CH, PT, HU Category: II2H3P - II2E3P
Flue Type: C13 - C33 - C53 - C63 - C83
Electrical protection index: IP X4 D
LWA sound power level, indoors 52 dB NOx class 6 - 19.42 mg/kWh
ErP D.H.W.
Seasonal space heating energy efciency class Water heating energy efciency class
µs seasonal space heating energy efciency 92.6 % Load Prole XL
Pn nominal heat input 33.0 kW µwh water heating energy efciency 83.65 %
P4 nominal heat output high temperature 31.5 kW Qfuel daily fuel consumption 23.339 kWh
P1 nominal heat output (30% Pn) low temperature 10.8 kW AFC Annual fuel consumption 17.626 GJ
Qelec daily electricity consumption 0.176 kWh
AEC annual electricity consumption 38.552 kWh
µ4 efciency at nominal heat output high temperature 86.0 %
µ1 efciency at 30% nominal heat output low temperature 97.9 %
Auxiliary electricity consumption:
elmax at full load 0.034 kW PSB in standby mode 0.005 kW
elmin at part load 0.016 kW Pstby standby heat loss 0.056 kW