ARCA PIXEL 25 FC User manual

WALL HUNG BOILERS
INSTRUCTIONS MANUAL
To be used for
INSTALLATION, USE AND MAINTENANCE
CONDENSING BOILERS
PIXEL 25 FC
PIXEL 31 FC
IMPORTANT
The first boiler ignition and the warranty have to be carried out by an authorised
personnel
LIB0900PING – 24 pages - 1aedition - 23/02/2006 -

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.
Note: due to the high efficiency of these boilers a plume of water vapour will form art the flue
terminal during the operation.
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 FC, PIXEL 31 FC----------------------------------5
1.5 Technical data -----------------------------------------------------------------------------------------------------------------6
1.6 PIXEL FC: Electrical scheme-----------------------------------------------------------------------------------------------7
1.7 PIXEL FC: Electrical scheme-----------------------------------------------------------------------------------------------8
2. INSTALLATION INSTRUCTIONS ------------------------------------------------------------------- 9
2.1 Combustion product discharge: PIXEL 25 FC, PIXEL 31 FC ----------------------------------------------------------9
2.1.1 Different venting options - Flue venting ------------------------------------------------------------------------9
2.1.2 Lenght of discharge ducts: PIXEL 25 FC-------------------------------------------------------------------------10
2.1.2.1 Split flue (Ø 80 mm)-------------------------------------------------------------------------------------10
2.1.2.2 Coaxial flue (Ø 60 x 100 mm) ------------------------------------------------------------------------10
2.1.3 Lenght of discharge ducts: PIXEL 31 FC-------------------------------------------------------------------------11
2.1.3.1 Split flue (Ø 80 mm)-------------------------------------------------------------------------------------11
2.1.3.2 Coaxial flue (Ø 60 x 100 mm) ------------------------------------------------------------------------11
2.2 Boiler placing -------------------------------------------------------------------------------------------------------------------12
2.3 Hydraulic connections--------------------------------------------------------------------------------------------------------13
2.4 Electric connections ----------------------------------------------------------------------------------------------------------13
2.5 Gas connection ----------------------------------------------------------------------------------------------------------------14
2.6 Setting of control panel ------------------------------------------------------------------------------------------------------15
2.7 Adjustement instructions: nominal heat and minimal heat ----------------------------------------------------------16
2.7.1 Nominal heat adjustment -------------------------------------------------------------------------------------------16
2.7.2 Minimal heat adjustment---------------------------------------------------------------------------------------------16
2.8 Slow ignition and nominal heat adjustment -----------------------------------------------------------------------------16
2.8.1 Slow ignition adjustment --------------------------------------------------------------------------------------------16
2.8.2 Nominal heat adjustment -------------------------------------------------------------------------------------------16
2.9 Different gases-----------------------------------------------------------------------------------------------------------------16
2.10 Injectors - pressure table: PIXEL 25 FC ---------------------------------------------------------------------------------17
2.10.1 Gas pressure - Heat diagram-------------------------------------------------------------------------------------17
2.11 Injectors - pressure table: PIXEL 25 FC ---------------------------------------------------------------------------------17
2.11.1 Gas pressure - Heat diagram-------------------------------------------------------------------------------------17
3. MAINTENANCE INSTRUCTIONS------------------------------------------------------------------- 18
3.1 Introduction ---------------------------------------------------------------------------------------------------------------------18
3.2 Circulation deblocking--------------------------------------------------------------------------------------------------------18
4. USER'S INSTRUCTIONS------------------------------------------------------------------------------ 19
4.1 Control panel -------------------------------------------------------------------------------------------------------------------19
4.2 Ignition ---------------------------------------------------------------------------------------------------------------------------19
4.3 Summer mode -----------------------------------------------------------------------------------------------------------------19
4.4 Winter mode --------------------------------------------------------------------------------------------------------------------19
4.4.1 Winter mode with OTC (Outside Control Temperature)------------------------------------------------------------20
4.5 Break down signals -----------------------------------------------------------------------------------------------------------20
4.6 Temporary shut down --------------------------------------------------------------------------------------------------------20
4.7 Long term shut downi --------------------------------------------------------------------------------------------------------20
4.8 Suggestions --------------------------------------------------------------------------------------------------------------------20
4.9 Functioning problems --------------------------------------------------------------------------------------------------------21
Declaration of conformity----------------------------------------------------------------------------------------------------------22
3

1. TECHNICAL DATA
1.1 DIMENSIONS
BOILER L (mm) H (mm) P (mm) A (mm) B (mm) C (mm) D (mm)
PIXEL C 400 720 300 200 200 182 118
1.2 HYDRAULIC SCHEME
1 - gas valve
2 - burner
3 - primary exchanger
4 - circulator
5 - bypass supply
6 - manometer
7 - safety valve (set to 3 bar)
8 - filter
9 - valve of charging supply
10 - vase of expansion
11 - valve in three streets flussostatica
12 - valve of discharging air
13 - sanitary exchanger
14 - condensing exchanger
15 - condensing trap
16 - Fan
1.3 AVAILABLE HEAD
4
L
AB
H
P
CD
4
10
7
6
12
11
13
8
9
5
3
2
1
15
14
16
0
0,5
1
1,5
2
2,5
3
3,5
4
4,5
5
5,5
6
6,5
0 100 200 300 400 500 600 700 800 900 1000 1100 1200 1300 1400 1500 1600 1700
Flow rate (l/h)
Available head H (m)
without by-pass
with by-pass

1.4 General layout of the main components of models
PIXEL 25 FC, PIXEL 31 FC
1. Air Pressostat
2. Discharge air valve
3. Primary exchanger limit thermostat (105°C)
4. Flue gas ducts limit thermostat (105°C)
5. Aluminium condensing exchanger Copper
primary exchanger
6. Copper primary exchanger
7. Electrode of lighting and survey
8. Burner
9. Circulator
10.Gas valve
11. Safety valve (3 bar)
12. Condensing trap
13. Supply charge
14. Discharge valve
15. D.H.W. exchanger
16. C.H. sensor
17. Hydraulic three ways valve
18. Sealed chamber
19. Fan
20. Condensate sensor
5
15 17
10
13 14 9
11
12
20
18
16
3
19
8
7
6
1425

1.5 TECHNICAL DATA Size PIXEL 25 F C PIXEL 31 F C
Type C12-C32-C42-C52 C12-C32-C42-C52
Nominal Heat Input to net calorific value (Hi) referred (80 °C /60 °C) KW 25 31
Minimum Het Input to net calorific value (Hi) referred (80 °C /60 °C) KW 10,5 12,4
Nominal Heat Output (80 °C/60 °C) KW 24,4 30,2
Nominal Heat Output Condensing (50 °C/30 °C) KW 26,9 33,3
Minimum Heat Output (80 °C/60 °C) KW 10,1 11,9
Minimum Heat Output Condensing (50 °C/30 °C) KW 10,7 12,6
EfficiencyRendimento (80 °C/60 °C) % 97,6 97,5
Partial Load efficiency (30 % of Pn) % 108,7 107,9
Nominal Heat Input (Pn) gas flowrate Natural gas G20 (2E+) m3/h 2,643 3,278
Natural gas G25 (2ELL) m3/h 3,0745 3,812
LPG G30 (3+) kg/h 1,970 2,443
LPG G31 (3P) kg/h 1,941 2,406
Net gas pressure Natural gas G20 (2E+) mbar 20/25 20/25
Natural gas G25 (2ELL) mbar 20 20
GPL G30 (3+) mbar 29 29
LPG G31 (3P) mbar 37 37
Pn flue gas temperature (80 °C / 60 °C) °C 70 74
Pn flue gas temperature (50 °C / 30 °C) °C 47 51
CO2(G20) % 8 8
NOx (according par 6.2.2 of EN 483) mg/KWh 190 (classe 2) 190 (classe 2)
Losses of heat to the cheminey with burner ignited % 2,8 3,0
Losses of heat to the cheminey with burner not ignited % 0,2 0,1
Losses of heat to the cover (∆T = 50 °C) % 0,5 0,5
Flue gas flow rate Nm3/h 42,09 53,03
CENTRAL HEATING
C.H. Minimum Set point °C 35 35
C.H. Maximum Set point °C 90 90
Volume of water in the boiler l 1,2 1,2
Volume of water of the expansion vessel l 7,5 7,5
Pressure of the expansion vessel bar 0,7 0,7
Least pressure in the primary circuit bar 0,4 0,4
Maximum pressure in the primary circuit bar 3 3
Maximum content of heating water l 150 150
Available head at 1000 l/h of flow rate mbar 230 330
DOMESTICAL HOT WATER
Minimum set point °C 30 30
Maximum set point °C 60 60
Production continuous warm water (T = 25 °C) l/min 14 17,3
Production continuous warm water (T = 35 °C) l/min 10 12,4
Water Volume(T = 30 °C during the first 10 minutes) l 116,6 144,3
Minimum flow l/min 2,5 2,5
Maximum pressure bar 8 8
Minimum pressure bar 0,5 0,5
Voltage l ---- ----
Frequency V/Hz 230/50 230/50
Absorbed eletric power W 150 150
CONNECTION
Flow connection C.H. Inch 3/4" 3/4"
Flow connection D.H.W. Inch 1/2" 1/2"
Gas connection Inch 3/4" 3/4"
Height mm 720 720
Depth mm 300 300
Width mm 400 400
LENGHT OF FLUE GAS DUCTS
Ø 60 x 100 mm coaxial m 4 4
Ø 80 mm doubled m 30 30
Ø 60 mm doubled m ---- ----
Weight Kg 43 43
Degree of protection IP X4D X4D
CE certification 0068 0068
6

1.6 PIXEL FC: ELECTRICAL SCHEME
7
PHASE
NEUTRAL
GROUND
FUSE:
2 x 3,15 AF 5x20 - 250 V
PUMP
FAN
GAS VALVE
N
L
N.O.
C
SUPPLY SENSOR
DHW MICRO SWITCH
P1
P3
P2 TRANSDUCER OF
PRESSURE OF HEATING
SYSTEM
AMBIENT
THERMOSTAT/REMOTE
CONTROL (OPTIONAL)
AIR PRESSOSTAT
3
1
GAS VALVE MODULATOR
ELETTRODE OF LIGHTING
AND SURVEY
EXTERNAL SENSOR
CONDENSATE SENSO
R
Primary exchanger limit
thermostat (105°C)
Flue gas ducts limit
thermostat (105°C)
DHW SENSOR

1.6 PIXEL FCR: ELECTRICAL SCHEME
8
DHW
HEATING SYSTEM
3 WAYS VALVE
EXTERNAL SENSOR
ELECTRODE OF LIGHTING
AND SURVEY
GAS VALVE MODULATOR
1
3
AIR PRESSOSTAT
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
Flue gas ducts limit
thermostat (105°C)
Primary exchanger limit
thermostat (105°C)
CONDENSATE SENSOR

2 INSTALLATION INSTRUCTIONS
2.1 DIFFERENT VENTING OPTIONS:
PIXEL 25 FC, PIXEL 31 FC
Sealed 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.
The boiler has to be connected to flue gas ducts coaxial or doubled that must desccharge to the outside.
Without them the boiler must not be do to work.
For condensing ARCA boilers you must use only original accessories.
ARCA have also a polipropilene version of flue gas ducts with resistance to the temperature of 120°C
in continuous regime
ARCA have not responsibility for every violation to the recommendations that are in this book and
particularly those related to the unloadings smoke.
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.
Note: due to the high efficiency of these boilers a plume of water vapour will form art the flue
terminal during the operation.
9

2.1.2 LENGTH OF FLUE GAS DUCT:
PIXEL 25 FC
2.1.2.1 SPLIT FLUE
Ø 80 mm
N.B.: The flue and aspiration
duct lenght has not to exceed
30 m.
By 0 to 2 m you must put
a Ø 42 mm diaphragme in
the outlet of the fan.
For every added 90° elbow the
maximum allovable lenght is to
be diminuished by 2 m.
The pipes of aspiration and unloading
must be climbed on upward with
inclination of 3° so that the
condensing product flows into the
boiler rather than to the outside.
2.1.2.2 COAXIAL FLUE
Ø 60 x 100 mm
N.B.: The allowed lenght
of coaxial flue ducts is by
a minimum 0,5 meters to
a maximum of 4 meters.
By 0 to 1 you must put a
Ø 42 mm diaphragme in
the outlet of the fan.
The ducts must be
climbed on with light
inclination toward the
outside.
The pipes of aspiration and unloading
must be climbed on upward with
inclination of 3° so that the
condensing product flows into the
boiler rather than to the outside.
10
175
MAX 15 m +
MAX 15 m
105 120
STRAIGHT ON
MAX 15 m
MAX 4 m
143 171
314
MAX 4 m
100