ARCA PIXEL 25 N User manual

WALL HUNG BOILERS
INSTRUCTIONS MANUAL
To be used for
INSTALLATION, USE AND MAINTENANCE
PIXEL 25 N
PIXEL 25 NR
PIXEL 29 F
PIXEL 29 FR
PIXEL 25 F
PIXEL 25 FR
PIXEL IN 25 F
PIXEL IN 25 FR
PIXEL ES 25 F
PIXEL ES 25 FR
IMPORTANT
The first boiler ignition and the warranty have to be carried out by an authorised
personnel
LIB0900P – Rev. 1 - 21/02/2006 - 28 pagine

GENERAL RULES
This instruction book is an integrant and essential part of our product and it is delivered together with our heater.
Read carefully the information about safety, installation and maintenance that are shown in it. The heater installation is to
be carried out by qualified personnel according to the present law and the producer instructions.
After having removed the packaging it is better to control the good state of the product. Don't use the heater if you have
any doubt about this just call your supplier.
IMPORTANT: this heater is aimed to warm water at an inferior temperature than that of the boiling at an atmospheric
pressure; it has to be linked to an heating system and/or a hot water distribution net proper to its capacity and power.
This heater has to be used only according to the usage it was planned for. Every kind of other usage has to be
considered unproper and dangerous. The producer is not to be considered responsible for possible damages caused by
this wrong, unproper and unreasonable usage.
Cut the heater from its supply net off before doing every kind of service operations.
Don't obstruct heater aspiration or dissipation grills.
Put the heater out of work if there is any damage or misfunctioning. The repairing must be carried out by an authorized
service operation centre and it has to use only original spare parts.
In order to grant the highest heater efficiency and for its good functioning it is indispensable to follow the producer
instructions.
If you decide not to use the heater any more make all the dangerous parts became harmless.
Don't wet the heater neither with water nor with other liquid substances.
Don't put other items on the surface of the heater.
Before starting every kind of service operation which forsees the burner dismantling or the opening of inspection holes
you have to cut off the electrical supply and close gas cocks.
If there are chimney service operations turn the heater off. After having finished the operation you should call your
qualified personnel and make the relief duct efficiency control.
Don't clean the heater with inflammable substances.
Don't leave recipients of inflammable substances near the heater.
The electrical safety of the heater is assured only if it is linked to an ground system which is respectful of present laws.
Your qualified personnel must control the efficiency of your net because if there are any problems the producer is not
responsable for damages caused by the lacking of a proper ground system.
Control your electrical system capacity which is to be proper to the power required by your heater.
As far as the heater supply is concerned you cannot use adaptators, multiple plugs and extensions.
The use of electrical items implies the careful observation of fundamental rules such as:
1 do not touch the heater with wet hands;
2 do not tear electrical cables;
3 give not allow children or unused persons to use the heater.
All the following instructions that macaws to be take in mind by the technician on the products of the firm ARCA S.r.l.
The ordinary maintenance and the possible reparation of the products must have nade by a center assistance authorized
from the ARCA S.r.l., exclusively using original pspare parts..
Use only flue gas ducts and electric accessories and furnished by ARCA S.r.l.
Do not replace the supply pipe by your own but only by a qualified person.
You have to assure that safety discharge tubes are linked to a relief valve.
Otherwise, there can be an overfload of the heater site caused by the valves safety action and therefore the producer is
not responsible.
System pipes have not to be used as ground plugs for other systems; not only are they unproper to this use but they can
cause serious problems to the appliances which are linked to them.
Please control:
1 the good functioning of the gas inlet system;
2 the correct gas capacity is the one required by the heater power;
3 that the type of gas used is that the heater was projected for.
4 that the gas supply pressure is within the required values of the heater.
5 that the gas inlet system is proper and has all the required safety caracteristics which are forseen by law.
If you feel gas odour do not turn electrical switches on just open your windows and close gas cocks.
2

SUMMARY
GENERAL RULES -----------------------------------------------------------------------------------------------------------------2
1. TECHNICAL DATA ------------------------------------------------------------------------------------- 4
1.1 Dimensions ------------------------------------------------------------------------------------------------------------------------------------- 4
1.2 Hydraulic scheme ----------------------------------------------------------------------------------------------------------------------------- 4
1.3 Available head --------------------------------------------------------------------------------------------------------------------------------- 4
1.4 General layout of the main components of models PIXEL 25 N ------------------------------------------------------------------ 5
1.5 General layout of the main components of models PIXEL 25 F, PIXEL ES 25, PIXEL IN 25 F -------------------------- 6
1.6 General layout of the main components of models PIXEL 29 F ------------------------------------------------------------------ 7
1.7 Technical data --------------------------------------------------------------------------------------------------------------------------------- 8
1.8 Electrical scheme of PIXEL 25 N --------------------------------------------------------------------------------------------------------- 9
1.9 Electrical scheme of PIXEL 25 NR ------------------------------------------------------------------------------------------------------- 10
1.10 Electrical scheme of PIXEL 25 F, PIXEL ES 25 F, PIXEL IN 25 F, PIXEL 29 F -------------------------------------------- 11
1.12 Electrical scheme of PIXEL 25 FR, PIXEL ES 25 FR, PIXEL IN 25 FR, PIXEL 29 FR------------------------------------ 12
2. INSTALLATION INSTRUCTIONS ------------------------------------------------------------------- 13
2.1 Combustion product discharge: PIXEL 25 F, PIXEL ES 25 F, PIXEL IN 25 F, PIXEL 29 F ------------------------------- 13
2.1.1 Different venting options - Flue venting --------------------------------------------------------------------------------------- 13
2.1.2 Lenght of discharge ducts: PIXEL 25 F, PIXEL ES 25 F, PIXEL IN 25 F --------------------------------------------- 14
2.1.2.1 Split flue (Ø 80 mm) -------------------------------------------------------------------------------------------------- 14
2.1.2.2 Coaxial flue (Ø 60 x 100 mm)-------------------------------------------------------------------------------------- 14
2.1.3 Lenght of discharge ducts: PIXEL 29 F---------------------------------------------------------------------------------------- 15
2.1.3.1 Split flue (Ø 80 mm) -------------------------------------------------------------------------------------------------- 15
2.1.3.2 Coaxial flue (Ø 60 x 100 mm)-------------------------------------------------------------------------------------- 15
2.2 Combustion product discharge: PIXEL 25 N ----------------------------------------------------------------------------------------- 16
2.2.1 Connection with a cheminey ----------------------------------------------------------------------------------------------------- 16
2.2.2 Outdoor direct discarge ------------------------------------------------------------------------------------------------------------ 16
2.2.3 Venting of the rooms --------------------------------------------------------------------------------------------------------------- 17
2.3 Boiler placing----------------------------------------------------------------------------------------------------------------------------------- 17
2.4 Hydraulic connections ----------------------------------------------------------------------------------------------------------------------- 18
2.5 Electric connections -------------------------------------------------------------------------------------------------------------------------- 18
2.6 Gas connection -------------------------------------------------------------------------------------------------------------------------------- 19
2.7 Setting of control panel ---------------------------------------------------------------------------------------------------------------------- 20
2.8 Adjustement instructions: nominal heat and minimal heat-------------------------------------------------------------------------- 21
2.8.1 Nominal heat adjustment ---------------------------------------------------------------------------------------------------------- 21
2.8.2 Minimal heat adjustment ----------------------------------------------------------------------------------------------------------- 21
2.9 Slow ignition and nominal heat adjustment--------------------------------------------------------------------------------------------- 21
2.9.1 Slow ignition adjustment----------------------------------------------------------------------------------------------------------- 21
2.9.2 Nominal heat adjustment ---------------------------------------------------------------------------------------------------------- 22
2.10 Different gases ------------------------------------------------------------------------------------------------------------------------------- 22
2.11 Injectors - pressure table: PIXEL 25 N------------------------------------------------------------------------------------------------- 22
2.11.1 Gas pressure - Heat diagram---------------------------------------------------------------------------------------------------- 22
2.12 Injectors - pressure table: PIXEL 25 F, PIXEL ES 25 F, PIXEL IN 25 F ------------------------------------------------------ 23
2.12.1 Gas pressure - Heat diagram---------------------------------------------------------------------------------------------------- 23
2.13 Injectors - pressure table: PIXEL 29 F ------------------------------------------------------------------------------------------------- 24
2.13.1 Gas pressure - Heat diagram---------------------------------------------------------------------------------------------------- 24
3. MAINTENANCE INSTRUCTIONS------------------------------------------------------------------- 25
3.1 Introduction ------------------------------------------------------------------------------------------------------------------------------------- 25
3.2 Circulation deblocking ----------------------------------------------------------------------------------------------------------------------- 25
4. USER'S INSTRUCTIONS------------------------------------------------------------------------------ 26
4.1 Control panel ----------------------------------------------------------------------------------------------------------------------------------- 26
4.2 Ignition ------------------------------------------------------------------------------------------------------------------------------------------- 27
4.3 Summer functioning -------------------------------------------------------------------------------------------------------------------------- 27
4.4 Winter functioning----------------------------------------------------------------------------------------------------------------------------- 27
4.5 Break down signals--------------------------------------------------------------------------------------------------------------------------- 27
4.6 Temporary shut down------------------------------------------------------------------------------------------------------------------------ 27
4.7 Long term shut downi ------------------------------------------------------------------------------------------------------------------------ 27
4.8 Suggestions ------------------------------------------------------------------------------------------------------------------------------------ 27
4.9 Functioning problems ------------------------------------------------------------------------------------------------------------------------ 28
Declaration of conformity ------------------------------------------------------------------------------------------------------------------------- 29
3

1. TECHNICAL DATA
1.1 DIMENSIONS
BOILER L (mm) H (mm) P (mm) A (mm) B (mm) C (mm) D (mm)
PIXEL 25 N 400 720 300 200 200 182 118
PIXEL 25 F 400 650 260 235 165 103 157
PIXEL 29 F 400 720 300 200 200 182 118
1.2 HYDRAULIC SCHEME
1 - gas valve
2 - burner
3 - primary exchanger
4 - circulator
5 - flussostat
6 - bypass supply
7 - manometer
8 - safety valve (set to 3 bar)
9 - filter
10 - valve of charging supply
11 - vase of expansion
12 - valve in three streets flussostatica
13 - valve I discharging air
14 - sanitary exchanger
1.3 AVAILABLE HEAD
4
0
0,5
1
1,5
2
2,5
3
3,5
4
4,5
5
5,5
6
6,5
Flow (l/h)
Available head H (m)
PIXEL 25 N, F
without by-pass
PIXE L 25 N , F w ith
by-pass
PIXEL 29 F without
by-pass
PIXEL 29 F with by-
pass
L
AB
H
P
CD
4
11
7
6
13
14
12
9
5
6
10
1
2
3
HOT
DOMESTICAL
WATER
COLD
DOMESTICAL
WATER
RETURN
SUPPLY
GAS

1.4 General layout of the main components of model
PIXEL 25 N
1. Flue gas thermostat
2. Discharge air valve
3. Limit thermostat (105°C)
4. Copper Primary Exchanger
5. Electrode of lighting and survey
6. Burner
7. Circulator
8. Gas valve
9. Safety valve (3 bar)
10. Supply charge valve
11. Supply descharge valve
12. DHW exchanger
13. Supply sensor
14. Hydraulic valve
15. Flue gas cap
16. DHW sensor
5
1
2
3
4
13
6
7
89
10
14
15
5
12 11
16

1.5 General layout of the main components of models:
PIXEL 25 F, PIXEL ES 25 F, PIXEL IN 25 F
1. Air Pressostat
2. Discharge air valve
3. Limit thermostat (105°C)
4. Copper Primary Exchanger
5. Electrode of lighting and survey
6. Burner
7. Circulator
8. Gas valve
9. Safety valve (3 bar)
10. Supply charge valve
11. Sanitary water exchanger
12. Supply sensor
13. Hydraulic valve
14. Proof chamber
15. Fan
6
12
12
3
4
5
6
7
8
9
11 13
15
14
10

1.6 General layout of the main components of model
PIXEL 29 F
1 Air Pressostat
2 Discharge air valve
3 Limit thermostat (105°C)
4 Copper Primary Exchanger
5 Electrode of lighting and survey
6 Burner
7 Circulator
8 Gas valve
9 Valvola di sicurezza (3 bar)
10 Supply charge valve
11 Supply descharge valve
12 Sanitary water exchanger
13 Sonda riscaldamento
14 Hydraulic valve
15 Proof chamber
16 Fan
7
1
2
3
13
6
5
4
7
8
1014 11
9
12
15
16

1.7 TECNICAL DATA Size PIXEL 25 N PIXEL 25 F,
ES 25 F, IN 25 F PIXEL 29 F
Type B11BS C12-C32-C42-C52 C12-C32-C42-C52
Nominal Heat KW 27 27 31,5
Nominal Heat Kcal/h 23220 23220 27090
Useful Heat KW 24,7 25,1 29,3
Useful Heat Kcal/h 21200 21734 25194
Efficiency % 91,3 92,9 93
Minimal Heat KW 10,5 10,5 12,4
Minimal Useful Heat KW 9,4 9,5 11,3
Efficiency at 30 % of Nominal Heat % 89,5 90,7 91,2
Nominal Heat Gas Flow Metano G20 (2E+) m3/h 2,855 2,855 3,331
Metano G25 (2ELL) m3/h 3,320 3,320 3,874
GPL G30 (3+) kg/h 2,128 2,128 2,482
GPL G31 (3P) kg/h 2,096 2,096 2,445
Inlet pressure Metano G20 (2E+) mbar 20/25 20/25 20/25
Metano G25 (2ELL)
mbar 20 20 20
GPL G30 (3+) mbar 29 29 29
GPL G31 (3P) mbar 37 37 37
Flue gas temperature °C 115,3 126,7 131,4
CO2(G20) % 6 7,7 7,6
Pondered NOx (according to EN 483 pars 6.2.2) mg/KWh ---- 119 (classe 3) ----
Losses of heat to the cover with burner ignited % 6,8 6,6 6,5
Losses of heat to the cover with burnernot ignited % 0,2 0,2 0,1
Losses of heat to the cover ((T = 50 °Cs) % 1,9 0,3 0,5
Gas flow rate Nm3/h 58,7 47,0 55,5
CENTRAL HEATING
C.H. Minimum Set point °C 35 35 35
C.H. Maximum Set point °C 90 90 90
Volume of water in the boiler l 1,2 1,2 1,2
Volume of water of the expansion vessel l 7,5 7,5 7,5
Pressure of the expansion vessel bar 0,7 0,7 0,7
Least pressure in the primary circuit bar 0,4 0,4 0,4
Maximum pressure in the primary circuit bar 3 3 3
Maximum content of heating water l 150 150 150
Available head at 1000 l/h of flow rate mbar 230 230 330
Domestical hot water
Minimum set point °C 30 30 30
Maximum set point °C 60 60 60
Production continuous warm water (t = 25 °C) l/min 14,1 14,4 16,8
Production continuous warm water (t = 35 °C) l/min 10,1 10,3 12,0
Volume water (t = 30 °C in the first 10 minutes) l 117,8 120 140
Minimum flow l/min 2,5 2,5 2,5
Maximum pressure bar 8 8 8
Minimum pressure bar 0,5 0,5 0,5
Voltage l ---- ---- ----
Frequency V/Hz 230/50 230/50 230/50
Absorbed eletric power W 90 120 120
CONNECTIONS
Heating Inch 3/4" 3/4" 3/4"
Sanitary water Inch 1/2" 1/2" 1/2"
Gas Inch 1/2" 3/4" 3/4"
Height mm 720 650 720
Depth mm 300 260 300
Width mm 400 400 400
Lenght of flue gas ducts
Coaxial Ø 60 xes 100 mms m 3 4 4
Doubled Ø 80 mms m 16 30 30
Doubled Ø 60 mms m ---- ---- ----
Weight Kg 43 40 43
Degree of protection IP 44 IP4X 44
Homologation CE 0068 0068 0068
8

1.6 ELECTRICAL SCHEME of PIXEL 25 N
9
PHASE
NEUTRAL
GROUND
FUSE:
2 x 3,15 AF 5x20 - 250 V
PUMP
GAS VALVE
N
L
SUPPLY SENSOR
ROSSO
ROSSO
P1
P3
P2 PRESSURE
TRANSDUCTOR OF
HEATING SYSTEM
AMBIENT
THERMOSTAT /
REMOTE CONTROL
(OPTIONAL)
SUPPLY WATER
SAFETY BLOCK
FLUE GAS
THERMOSTAT
GAS VALVE MODULAT
O
ELECTRODE OF LIGH
T
AND SURVEY
EXTERNAL SENSOR
(OPTIONAL)
C N.O.
DHW micro
switch
DHW SENSOR (optional)

1.7 ELECTRICAL SCHEME of PIXEL 25 NR
10
SAN.
RISC.
3 WAYS VALVE
(OPZIONALE)
EXTERNAL SENSOR
(OPTIONAL)
ELECTRODE OF LIGHTING
AND SURVEY
GAS VALVE MODULATOR
FLUE GAS
THERMOSTAT
SUPPLY WATER
SAFETY BLOCK
AMBIENT
THERMOSTAT /
REMOTE CONTROL
(OPTIONAL)
PRESSURE
TRANSDUCTOR OF
HEATING SYSTEM
P2
P3
P1
ROSSO
ROSSO SUPPLY SENSOR
DHW SENSOR
(OPTIONAL)
LN
GAS VALVE
BLU
MARRONE PUMP
FUSE:
2 x 3,15 AF 5x20 - 250 V
GROUND
NEUTRAL
PHASE

1.8 ELECTRICAL SCHEME of PIXEL 25 F, PIXEL ES 25 F,
PIXEL IN 25 F, PIXEL 29 F
11
EXTERNAL SENSOR
ELETTRODE OF LIGHTING
AND SURVEY
GAS VALVE MODULATOR
1
3
AIR PRESSOSTAT
SAFETY THERMOSTAT
(105°C)
AMBIENT
THERMOSTAT/REMOTE
CONTROL (OPTIONAL)
TRANSDUCER OF
PRESSURE OF HEATING
SYSTEM
P2
P3
P1
DHW MICRO SWITCH
SUPPLY SENSOR
SONDA SANITARIO
C
N.O.
LN
GAS VALVE
FAN
PUMP
FUSE:
2 x 3,15 AF 5x20 - 250 V
GROUND
NEUTRAL
PHASE

1.8 ELECTRICAL SCHEME of PIXEL 25 FR, PIXEL ES 25 FR,
PIXEL IN 25 FR, PIXEL 29 FR
12
DHW
HEATING SYSTEM
3 WAYS VALVE
EXTERNAL SENSOR
ELECTRODE OF LIGHTING
AND SURVEY
GAS VALVE MODULATOR
1
3
AIR PRESSOSTAT
TERMOSTATO LIMITE
TEMPERATURA ACQUA
AMBIENT
THERMOSTAT/
REMOTE CONTROL
(OPTIONAL)
TRANSDUCER OF
PRESSURE OF HEATING
SYSTEM
P2
P3
P1
SUPPLY SENSOR
DHW SENSOR (OPTIONAL)
LN
GAS VALVE
FAN
PUMP
FUSE:
2 x 3,15 AF 5x20 - 250 V
GROUND
NEUTRAL
PHASE

2 INSTALLATION INSTRUCTIONS
2.1 DIFFERENT VENTING OPTIONS:
PIXEL 25 F, PIXEL ES 25 F, PIXEL IN 25 F, PIXEL 29 F
Proof chamber heaters do not require particular caracteristics as for siting and installation
are concerned.
Take particular attention to discharge and aspiration unions in order to avoid combustion
product leakage.
Use only original spare parts.
2.1.1 Different venting options - Flue Venting
1. Coaxial vent through the roof
2. Coaxial through the wall
3. Split type venting between two
cheminey
4. Split type, discharge into a
cheminey, fresh air from outdoor
wall
5. Coaxial, connection
with coaxial cheminey
CAUTION! - Follow local regulations concerning draught terminals location from windows
and doors.
13

2.1.2 LENGTH OF FLUE GAS DUCT:
PIXEL 25 F, PIXEL ES 25 F, PIXEL IN 25 F
2.1.2.1 SPLIT FLUE
Ø 80 mm
N.B.: The flue and
aspiration duct lenght has
not to exceed 16 m.
For every added 90°
elbow the maximum
allovable lenght is to be
diminuished by 2 m.
Horizontal aspiration and
discharge duct are to be
placed slightly inclined
towards the outside.
2.1.3.2 COAXIAL FLUE
Ø 60 x 100 mm
N.B.: The allowed lenght of coaxial
ducts varies between to 0,5 ms
minimal lenght and to 4 ms maximal
lenght.
By 0 to 1 meters length the
presence is necessary of a
diaphragm Ø 44 in the outlet
of the fan.
By 2 to 3 meters length the
presence is necessary of a
diaphragm Ø 46 in the outlet
of the fan.
Horizontal aspiration and
discharge duct are to be
placed slightly inclined
towards the outside.
14
MAX 15 m
MAX 15 m +
105 120
175
400
235
650
165
STRAGHT ON
400
650
235 165
MAX 15 m
103 157
260
MAX 4 m
235 165
100
400
650
MAX 4 m

2.1.3 LENGTH OF FLUE GAS DUCT: PIXEL 29 F
2.1.3.1 SPLIT FLUE
Ø 80 mm
N.B.: The flue and aspiration
duct lenght has not to exceed
30 m.
For every added 90° elbow
the maximum allovable lenght
is to be diminuished by 2 m.
By 0 to 4 m of lenght you must
insert in the outlet of the fan a
Ø 44 mm diaphragm.
By 5 to 15 m of lenght you
must insert in the outlett of the
fan a Ø 44 mm diaphragm.
The pipe of aspiration and flue gas
must be climbed on with light
inclination toward the outside.
2.1.3.2 COAXIAL FLUE
Ø 60 x 100 mm
N.B.: The allowed lenght of coaxial
ducts varies between to 0,5 ms
minimal lenght and to 4 ms maximal
lenght.
By 0 to 1 meters length the
presence is necessary of a
diaphragm Ø 44 in the outlet
of the fan.
By 2 to 3 meters length the
presence is necessary of a
diaphragm Ø 46 in the outlet
of the fan.
Horizontal aspiration and
discharge duct are to be
placed slightly inclined
towards the outside.
15
IN LINEA RETTA
MAX 15 m
MAX 15 m +
105 120
175
235 165 MAX 15 m
235 165
MAX 4 m
100
235 165
103 157
260
MAX 4 m

2.2 COMBUSTION PRODUCT DISCHARGE: PIXEL 25 N
2.2.1 CONNECTION WITH A CHEMINEY
The cheminey has a grat importance for thewell running of the boiler; It must be done according these requests:
• Must be built with a resistant water material and must be resistant
• must be in material impermeable and resistant to the temperature of the smokes and to their condensation;
• must have a sufficient mechanical resistance and a weak [conduttività termica];
• must be perfectly proof;
• must have a most possible vertical and straight course and the terminal part must be equipped with a static aspirator
that assures an efficient and constant evacuation of the smokes;
• for avoid that the wind could create around the chimney pot of the zones of such pressure from prevail on the
ascensional strength of the gases of unloaded it is necessary that the orifice of evacuation overhangs of at least 0,4 mt.
any adjacent to structure the same fireplace (inclusive the height of the roof of the building) if distant less of 8mt.;
• the cheminey must have a diameter not inferior to that of cloack of the boiler to square or rectangular section the
inside section must be plus then 10% as regards that of exit of the same cloak;
• beginning from the cloak, the link must have a vertical pull of length not inferior to two turned the diameter before the
cheminey
2.2.2 OUTDOOR DIRECT DISCHARGE
The natural draught boilers could unload the smokes directly to the outside through the building wall ; a terminal of
draught to the extremity of the duct must be applied.
The duct must satisfy the followings requisite:
• the horizontal inside part to the building must be reduced to the minimum ([1mt.) and have an inclination in equal
slope at 3 o'clock% toward the outside;
• must not have more than two changes of direction;
• must receive the unloading of an only apparatus;
• must be protected;
• the pull external ending before the terminal of draught must stick out from the wall of at least two diameters;
• the vertical leaving pull from the cloak must be along at least a meter;
• the terminal of draught must overhang of at least 1,5mt. the attack of the duct on the cloak of the boiler.
la parte orizzontale interna all’edificio deve essere ridotta al minimo (max. 1mt.) ed avere un’inclinazione
2.2.3 VENTING OF THE ROOMS
The natural draught boilers are of open combustion to room and are scheduled for have laced the cheminey:
the combustive air has withdrawn directly from the environment in which the boiler is installed.
The rooms in which the boiler is placed will be able to have a ventilation of direct type (with taking of air in
the same place where the boiler is installed), or have an indirect ventilation (with taking of air in the adjoining
places) provided that they come respect the conditions under suitable:
DIRECT AIRING
• the place must have an opening of equal airing to 6 cm² for each installed [kW] and in all the cases
never inferior to 100cm², practiced directly on the wall toward the outside;
• the opening must be nearest possible to the floor;
16
PIXEL 25 N
300
Ø 130

• the opening must not be closing, but protected from a grate that doesn't reduce the useful section for
the flow rate of the air; that's why motive to the section of the hole is added the section of the closed
part of the grate;
• a correct airing could also be gotten through the add openings more, provided that the adds of the
varied sections it correspond to the necessary one;
• if iss not possible practise the near opening to the floor, it is necessary increase the section of the same
at least of the 50%;
• the presence of a fireplace in the same place requires a feeding of own air, otherwise the installation of
apparatuses of B type has not allowed;
• if in the place there is other apparatuses that require of air for their operation (for instance cloaks or
aspirators), the section of the opening of airing goes calculated adequately.
INDIRECT AIRING
It in the case is not possible effect the airing directly in the place, he/she/it/you could be applied the
ventilation indi-straight line, withdrawing the air from an adjoining place through an adequate opening
practised in the low part of the door. This solution is however only possible if:
· the adjoining place is endowed with direct adequate ventilation;
· the adjoining place is not [adibito] to bedroom;
· the adjoining place is not a common part of the immovable property and is not an environment with danger
of fire (for instance deposits of inflammable substances, garage, etc.).
N.B.: In case of an insufficient ventilation of the place or of an incorrect evacuation of the smokes, flue gas
thermostat provokes a lockout of the boiler. For unblocking is necessary regulate the selector in position of
reset.
2.3 BOILER PLACING
Follow these instructions:
• having considered the boiler dimensions, fix the dimension plate by means of two hook screws;
• make two holes on the dimension plate holes by means of two hook screws;
• fix all terminal pipes such as cold and hot water pipes, system inlet and return pipes, gas pipes and
electrical cables into their proper holes on the dimension plate inferior part;
• after this it is possible to take away the dimension plate and use it other times;
• hang the boiler through the previously set expansion hooks;
• for the hydraulic connections screw iron-copper joints together with previously set connections. Cut
forwarded pipes according to the distance between boiler joints and iron-copper connections that are
placed on the wall;
• tighten them firmly and control there are no losses.
N.B.: please, remember of taking lead plastic coverings away
PIXEL 25 F PIXEL 25 N, PIXEL 29 F
17

2.4 HYDRAULIC CONNECTIONS
Domestic water
Supply net pressure is to vary from 1 to 6 bar. Install a reduction in case of higher
pressure. Supply water strenght influences the cleaning frequence of the exchange
serpentine pipe. The possibility of installing water treatment adequate appliances depends
on water caracteristics.
System loading
Slowly open the loading cock up to reaching about 1 bar system pressure, which can be
controlled through the pressure gauge situated on the facial panel. Close the evacuation
cock again.
Make the radiator air bleed using the proper manual valves.
When the system is cold set the system temperature at 1 bar.
In case of installation of the boiler in local
where the temperature environment can
go down below 0°C, we recommends you
to fill the heating system with antifreeze
solution.
You advises to use solutions of glicole
already diluted for avoiding the risk of
uncontrolled dilutions.
ETHILIC
GLYCOLE (%)
FREEZING
TEMPERATURE (°C)
6 0,00
10 -3,90
15 -6,10
20 -8,90
25 -11,70
30 -15,60
40 -23,40
50 -35,50
Suggestions and advice to avoid system vibrations and noises.
• avoid the use of pipes with reduced diametres;
• avoid the use of bends with reduced radius;
• it is better to have a hot system cleaning in order to eliminate all the impurities coming from pipes and
radiators - particularly oil and fat substances - which might damage the circulating pump.
e dai radiatori (in particolare oli e grassi) che rischierebbero di danneggiare il circolatore.
2.5 ELECTRIC CONNECTIONS
The boiler is set to work with a 230V / 50Hz single-phase tension. Connections have to be effectuated by
means of proper cables which come out of the boiler.
There is also an external cable for the ambient thermostat. Connect the thermostat after having eliminated
the jumper on the T.A cable terminal.. ( ATTENTION: the T.A. connection works by net tension; therefore,
you should use plastic models or if they are made by metal you shuold connect them to an efficient earth
system).
The boiler connection has to be protected by means of a 2 pole isolator and a proper fuse (1A).
The appliance has to be connected to an efficient earth system.
Follow present local regulations about safety.
N.B.: respect the phase and neutral position: an eventual inversion of these two positions results in a block of
the ignition panel.
N.B.: ARCA srl declines every kind of responsability for damages to persons, animals or things caused by
the lack of a proper earth system connection and local regulation attention.
18

2.6 GAS CONNECTION
Effect it I lace respecting the norms of the country meticulously.
Making sure that the pipeline of the gas has an adequate in operation section of his length.
Before effect the connection check that the characteristics of the distributed gas are equal you to those bring
on the dataplate of the boilerif these differs is necessary new regulations.
Insert a faucet of interception between the net of feeding of the gas and the boiler.
Open doors and windows and avoid the presence of free flames.
Clean the air contained in the plant tuba-uncle-ni-apparatus.
With the out boiler check that they there are not escapes of gas.
In these conditions observe the gas meter counter for at least 10 minutes for verify that it doesn't signal any
pas-wise of gas.
Verify, in each case, all the line of gas with a solution or equivalent product.
CAUTION!: For running with LPG is necessary the installation of a reduction gear of pressure awry of the
boiler.
1 -Presa pressione
bruciatore
2 - Presa pressione gas di
rete
3 -Vent
A -Vite regolazione
pressione minima
B - Dado regolazione
pressione massima
C- Cappuccio di
Protezione
To perform the control of the pressures to the burner, to insert the probes of the manometer in the available
takings of pressure on the valve gas (you see fig.).
N.B. check that the pressure and the course of the gas of net are enough to guarantee the correct
operation of the instrument to perform the measure to power on burner.
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2
1
3

2.7 SETTING OF CONTROL PANEL
You can set 4 ways of operation:
a) Normal way:
Mode of functioning of the boiler, temperature of supply, level of gas modulation and
presence of flame are visualised. Possible anomalies are visualized as besides from
coding at page 27.
b) Mode of visualization of boiler parameters:
It is activated by pushing P1+P2 for 6s. You can visualize in order:
Heating set
- supply temperature
Domestical hot water set
- domestical hot water temperature
- water supply pressure
- heat of ignition
- nominal heat output
c) Mode of parameters setting:
It is activated by pushing P1+P2 for 9s. You visualise alternatively the number of the
parameter Px and the current value. Pushing the keys P3 and P4 is possible to see in
sequence the modifiable parameters, otherwise with the keys P5 and P6 it is possible to
modify its value.
Pressing P3+P4 you can go out of the function without memorizing the changes.
Pressing P2 for 5s you go out the menu and you memorize the changes.
The available parameters are:
- P1 Power of ignition (by 0 % to 99 % of maximum value of range of regulation)
- P2 Power of heating (by 0 % to 99 % of maximum value of range of regulation)
- P3 Anti heating cicling timer (by 0 % to 99 % of 6 minutes)
- P4 oF = post-ventilation of fan off / on = post ventilation of fan on
- P5 Off = metano / on = GPL
- P6 Not available
- P6 oF = water's lack: boiler stops / on = water's lack: boiler doesn't stop, but you have to
call to call service assistance.
- P7 Minimum heating input (0 ÷ 100 %)
- P8 oF = external sensor off / on = external sensor on
- P9 K OTC (0 ÷ 6)
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