FonteCal MINITECH Series Reference manual

Ottobre 2003
10.1
technical manual for
installation, use and maintenance
WALL HUNG GAS BOILER
MINITECH
MINIPLUS
MODELS
WITH CONTINUOUS MICROPROCESS MODULATION
FOR HEATING AND SANITARY HOT WATER PRODUCTION

2
TECHNICAL MANUAL FOR INSTALLATION, USE AND MAINTENANCE
Index
Introduction .................................................................................................. 3
Models .......................................................................................................... 3
1. General Information ................................................................................. 4
2. Warnings.................................................................................................. 4
3. Installation ............................................................................................... 4
3.1 Boiler location ...............................................................................................4
3.2 Water installations and combustible system....................................................6
3.3 Air inlet and flue discharge ............................................................................7
3.4 Electrical system...........................................................................................10
3.5 Precautions before and during the boiler mounting on the wall....................10
3.6 Electronic board settings..............................................................................11
3.7 Modification of the boiler preset gas............................................................12
4. Use, operations and maintenance........................................................... 16
4.1 System filling...............................................................................................16
4.2 Boiler use ....................................................................................................16
4.3 Boiler operation...........................................................................................18
4.4RoomThermostat ........................................................................................18
4.5 Antifreezing function...................................................................................18
4.6Maintenance............................................................................................................19
Technical data............................................................................................... 20

3
TECHNICAL MANUAL FOR INSTALLATION, USE AND MAINTENANCE
CAN BE INSTALLED
EVERYWHERE !!!
ALWAYS SAFE !!!
Introduction
DearCustomer,
Congratulation on your choice and thank you for the trust reposed in our
products.
Buyingthisproductyouhavechosentechnologyandthebestsynthesisenergy
efficiencyandfunctionalityinfull respect of the strictest European norms on
safety
Your boiler is:
a versatile :the combustion circuit is completely sealed so that the
boilercanbeinstalled every where without specific requirements
and in accordance with the rules in force;
a safe : the boiler is equipped with advanced safety features which
itfrom abnormaloperating devicesofsuperiorclass ascompared
to the ones usually prescribed, this will guarantee the highest
safetyfortheuser.
Thefollowingparagraphshall brieflydescribe brieflydescribesthefunctioning
principle which characterizes the boiler itself.
Please carefully follow the both use and maintenance instructions in order
tocommence the warranty period.
Models
The boiler is available into the following versions::
W Models S E / S ER :heating only; opened / sealed chamber.
W Models X E / X ER :heating and hot water production opened /sealed
chamber.
“S” model is designed for heating only or for the connection to an external
watertank.Theboilerelectronicscontrolsthechangeover valve which could
be used to manage the water tank.
“X” model is equipped with a rapid exchange system for hot water
instantaneous production, the system can supply 13 l/min with a 25°C heat
differenceascomparedto the inlet water. Hotwaterdemandis detected by
a differential pressure switch which is activated with a minimum water flow
of 1.6 l/min

4
TECHNICAL MANUAL FOR INSTALLATION, USE AND MAINTENANCE
1 GENERAL INFORMATION
Please read and retain this manual in order to achieve full
satisfaction from the boiler use.
The equipment name, series, model, serial number and
technical data are shown on the label located inside the
boiler.
Thelettersfollowingthe commercialname definethe main
features of Your wall-hung boiler according tothe scheme
below:
Model:
S E: heating only, natural draught, open
combustion chamber (B11BS - EN297);
X E: heating and hot water instantaneous
production,naturaldraught,opencombustion
chamber (B11BS - EN297);
S ER: heating only, forced draught, sealed
combustion chamber (C2x, C62 - EN483);
X ER: heating and hot water instantaneous
production, forced draught, sealed
combustion chamber (C62x, C62 - EN483).
All the models have the same following features:
- electricignition;
- continuousflame modulation with microprocessor;
- nominal heat input 25 kW (21.500 kcal/h).
2 WARNINGS
This manual is delivered with the boiler and should always
be stored in the vicinity of the equipment for proper use
and maintenance.
PRELIMINARYOPERATIONS
Unpack the boiler by removing its cardboard and do not
turn it upside down. Always keep the boiler vertical on its
lower polystyrene base. Never place the boiler direcly on
the floor. After unpacking the boiler, make sure that the
equipmentis intact. When indoubt, contact your supplier.
Forsafety reasons and correct operation, installationmust
be carried out by professionally qualified technicians, in
compliance with current regulations and Manufacturer’s
instructions.
Manufacturer abdicates any responsibility in case of
damage caused by tempering, incorrect use and wrong
equipment installation, use and maintenance.
Shouldfailuresormalfunctioning occur,turn theequipment
off, refrain from making any repairs and call the Service
Centre.
NOTE! The boiler COMMISSIONING must be carried out
by the Service Centre technicians within 8 days from the
installation of the equipment. After commissiong, the
Service Centre shall fill in the guarantee certificate and
release part of it, which must be stored, thus starting the
guarantee period. Carefully read the conditions specified
inthe guaranteeform. Serviceduring theguarantee period
shall be provided if the guarantee slip has been validatd
duringcommissiong.
NOTE! Maintenance is compulsory and must be executed
at least once a year (DPR 412/93, 551/99). Contact the
authorised Service Centre. In any case, only technicians
who are qualified according to the laws in force can carry
out the maintenance activities.
3 INSTALLATION
NOTE! ONLY authorised and professionally-qualified
technicians who know the equipment, have read this
manual and comply with the (national and local) laws in
forcein the placeof installation, caninstall the equipment.
3.1 BOILER LOCATION
Open chamber boilers can only be installed in place which
comply with current regulations and, in any case, in
permanentlyventilatedplaces. Usethetwo screwsanchors,
suppliedwiththeequipment,toinstallthe boiler onastrong
masonrywall. Leave at least 35cm from the front panel of
the front panel of the equipment to facilitate use and
maintenance activities; leave at least 40 cm between the
top of the equipment and the ceiling and between the
bottomof theequipment andthe floorand from any other
no-removal impediment.When defining the installation
heightof the boiler, make surethat this its top partcannot
be easily reached with one’s hands.
NOTE ! Do not install the boiler in a dusty or very humid
environment. If the boiler is installed outdoor, it must be
protected against RAIN, ICE, HUMIDITY and DUST; make
sure that unauthorised people, children, animals, or
anything else which may damage or be damaged by the
boiler, cannot easily access the boiler.

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TECHNICAL MANUAL FOR INSTALLATION, USE AND MAINTENANCE
FIGURE 1 : Dimensions, free distance to be maintained, hydraulic connections, air inlet and flue
exhaustconnection.
2
9
Mod. E
MIN 50 cm
MIN 35 cm
6 878
Fori per tassello Ø14
1534
10
301
120
178
236
55
700
300
Mod. ER
MIN 40 cm
355
400
215
137
700
200
185 mod.E
159 mod.ER
Uscite e
scarico fumi
31
127
236
N° Description Dimens. Model N° Description Dimens. Model
1 System inlet G ¾” M E/ER 6 Double pipe system air inlet ∅60 mm ER
2 System flow G ¾” M E/ER 7 Double pipe system flue exhaust ∅60 mm ER
3 Water network G ¾” M E/ER 8 Double pipe system flue inlet/exhaust∅100/ ∅60 mm ER
4 Hot Water G ¾” M E/ER 9 flue exhaust ∅130 mm E
5 Gas G ¾” M E/ER 10 Space for electric cables 20x40 E/ER
air inlet and
flue discharge
holes for screw anchors Ø14

6
TECHNICAL MANUAL FOR INSTALLATION, USE AND MAINTENANCE
wall
boiler
3.2 WATER AND COMBUSTIBLE SYSTEM
The equipment has been designed for the type of
combustible gas specified on the plate located inside the
shell. Make sure that the available gas type and the gas
specified on the equipment match.
Thecombustiblesupply pipingand thecontrol system must
be perfectly sealed and their sections must be suitable for
the equipment capacity.
If L.P.G. is supplied, make sure that the second-stage
pressurereducer located on the tank-boiler line has a min.
capacity of 4 kg/h and 37 mbar (column of water 370)
outletpressure adjustment.
The original gas preset of the boiler can be changed by
replacing the gas nozzles and re-calibrating the gas valve
minimumpressure.
This operation must be carried out by qualified
technicians : contact the authorised Service Centre.
The Service Centre must verify the correct operation of
the equipment and officially validate the guarantee
certificate within 8 days from installation.
Fornewly-designed water systems, Fig. 1 shows the piping
layout when looking at the wall.
Fig. 2 shows how to connect pipes to the wall.
Place the wall mounting jig (delivered with the boiler) on
the wall to define the correct location of screw anchors
and pipes.
The pressure of the water coming from the water system
must be kept under control and below the limit specified
on the equipment plate, on the inlet point.
Hence the need for a pressure reducing valve on the
equipment cold water pipe.
The circulation device, at speed III, is suitable for the
majorityofthe systems.In single-pipeor very largesystems,
when the load loss is remarkable or when all radiators are
not equally supplied, the circulation of water can be
increasedby installing anadditional pump orreplacing the
pumpsuppliedwith theboilerwith anexpandedcirculation
device.
Seefig. 3for available head/flowrate curvesof the heating
system.
The boiler is equipped with a 7 litres storage tank which is
suitablefor standard heatingsystem. Specific solutionsare
needed for larger or vertical systems.
The standard equipment does not include an automatic
by-pass valve between the supply and return system.
A special automatic by-pass valve is needed when
thermostatic valves are installed on all radiators or when
local flow stopping valves are mounted.
FIGURE 2 : Pipes connection to the wall

7
TECHNICAL MANUAL FOR INSTALLATION, USE AND MAINTENANCE
Normal pump
Expanded pump
Beforemaking thehydraulic connections(heating, sanitary
water, relief valve and combustible gas discharge) remove
any test water plugs and check the system sealing.
Inareas where the temperature mayreach very lowvalues,
add some antifreeze to the heating system water.
Discharge the sanitary system when the boiler is not used
forvery long periods.
Topreventfreezing,operate the equipment by means of a
roomchrono-thermostat.
FIGURE 3: heating system available head/flow rate
chart.
3.3 AIR INLET AND FLUE DISCHARGE
E Models (SE, XE).
Theboilertakes thecarburantair necessaryforits operation
from the installation area, where air intakes must be
installed, in compliance with current regulation.
NOTE ! The equipment must be installed in a constantly
ventilated environment. Flue discharge Ø 130mm, must
comply with national and local technical regulation
concerning boilers which are not equipped with a fan on
thecombustion circuit (natural draught).
ER (SER, XER) model
The boiler has a forced draught and a sealed combustion
chamber; hence the need for two separate circuits: one
forcarburant air,taken fromexternal environmentand one
for combustion flue discharge. These circuits can follow
any path within the boiler; they can be very close to each
other,or evencoaxial. Theycan beconnected tojoint ducts
forsealed-chamber boilers or go directly to the roof or the
wall in compliance with laws in force (fig. 5).
The best (Directive 92/42/CEE) of the sealed chamber
boilercan be achieved inall installation conditions (air-flue
system, pipe diameter and length) thanks to the presence
of an air-intake calibrating diaphragm and an adjustable
shutter.
The shutter is located on the front part of the hood (Fig. 4
and 5) and it is placed on the “-” (upper) position by the
Manufacturer;to remove it to the “+”(lower) position, lift
the lever and turn it clockwise, down to the “+” position.
Bigger-diameter pipes canbe used tocollect anddischarge
condensate.

8
TECHNICAL MANUAL FOR INSTALLATION, USE AND MAINTENANCE
FIGURE 5
FIGURE 4
Seal chamber devices are manufactured for air intake and
flue discharge(Ø100-Ø60) coaxial systems; however it is
possibleto realizesome double pipesystems with separate
airintake (Ø60) and flue discharge pipes (Ø60); in order to
do so it is necessary to replace the cap and the collar
describedon picture 4 with those of picture 5, these latter
are supplied with the boiler itself.
NOTE :inside the lower sealed part of the boiler, inside the
metal casing, there is a 3mm hole which helps keeping
the pressure inside the boiler lower than the room one. In
this way, gas escapes are in-taken inside the combustion
chamber and they are not released into the room.
PIPES SELECTION FOR X ER MODELS
Follow the procedures below in order to realize a proper
pipe selection:
1) Select one of the four air-flue systems, in compliance
with current regulation, as per Fig.6 (C12, C32, C42,
C52).
2) Measure the total path length of air and flue pipes.
3) Select the air-flue pipe diameter/s and refer to Fig.6 to
define the aerodynamic resistance R for each pipe
section
4) Calculate the total aerodynamic resistance Rtot by
adding up the aerodynamic resistance R of air and flue
pipes.
5) Compare the calculated Rtot value with the max. value
specified in fig.5 for the selected air-flue system. The
calculated value should be equal to or lower than the
value specified in fig.5. Should this not be then case,
increase the pipe diameter and repeat the test starting
from point 3 above.
6) After passing the above mentioned test, establish how
to set the shutter. The cross reference table below
specifies the shutter setting depending on the type of
air-flue system(coaxial or double pipe),boiler type,total
aerodynamic resistence Rtot of the air-flue path.
Sealed chamber with forced draught:
;(5
5WRW systems C12-C32 till 2,0 From 2,0 a 3,0 From 3,0 a 5,0
5WRW systems C42-C52 till 1,0 From 1,0 a 2,0 From 2,0 a 4,0
Shutter setting

9
TECHNICAL MANUAL FOR INSTALLATION, USE AND MAINTENANCE
carburant air route R = aerodynamic resistance of a plain pipe route
flue route Rtot = total aerodynamic resistance of the pipes inside the air-flue route
EXAMPLE. Boiler X ER.
1) Selected air-fume system: double pipe C52.
2) Total path length: air (a) wind-proof head + (b) 0.8m
straight + (c) 90° bend; fumes (e) 90° bend + (f) 1.5m
straight,(g) wind-proof-head.
3)If ø60mm forair andø80mm forfumes, Rfor thevarious
sectionsis: Ra=0.2, Rb=0.8x0.8=0.64,Rc=0.8, Re=0.2,
Rf=1.5x0.3=4.5, Rg=0,1; for ø80 fume pipe, the (d)
60-80 reducer section is needed, resistance: Rd=0,2.
4)Rtot=0.2+0.64+0.8+0.2+0.2+0.45+0.1=2.59
5) Rtot=2.59 is good for C52 because it is lower than 4.0.
6) According to the table, the diaphragm is not needed
because Rtot is higher than 2.0, but the shutter must be
moved to the position
C12 = horizontal air
and flue pipes
system. Intake and
discharge areas are
very close and
under the same
wind conditions.
C32 = vertical air-
flue pipes. Intake
and discharge
areas are very
close and under the
same wind
conditions.
C42 = the air-flue
intake and
discharge system
are made through
the connection to
two collective and
separate pipes; one
for the air and the
other for the flues .
C52 = double pipe
air-flue system: one
for the air and the
other for the flues
which flowinto
different pressure
FIGURE 6: “ER” MODELS : Rtot TOTAL MAXIMUM ALLOWED AERODYNAMIC RESISTANCE OF THE PIPES
INSIDEW THE DIFFERENT AIR INTAKE AND FLUE DISCHARGE SYSTEMS
FIGURE 7: “ER” MODELS: TOTAL AERODYNAMIC RESICETENCE OF SOME PIPES SECTIONS

10
TECHNICAL MANUAL FOR INSTALLATION, USE AND MAINTENANCE
Terminal strip
NOTE .Duringinstallation,make surethatthe fumes cannot
go back into the equipment near terminal pieces or
jointsbetween various pipe sections. When no seals
areprovided, apply some silicon between two pipes.
3.4.ELECTRICAL SYSTEM.
Makesure thatthe available AC power matchesthe power
specifiedonthe equipmentrating plate (230VACFN 50Hz).
Check the grounding line and connect it to the boiler. The
manufacturer shall not shoulder any responsibilities for
damage caused by lack of compliance with this
requirement.
De-energisethe equipment and connectit to the electrical
system.For the electrical connection, use the terminal strip
located in the control panel and pay attention to the
indicated electrical connections. Remove the shell and the
control panel cover to access the terminal strip.
NOTE : the boiler needs to be powered with a
magneto-thermal differential switch (Idn=30mA).
NOTE. Pay attention to the phase and neutral polarity
and to the ground connection. Mistakes made
during this stage may permanently block the
burner.
Access to the terminal strip located in the boiler control
panel is needed in order to connect the room thermostat
TA (or chrono-thermostat). Remove the jumper between
terminals11-12ontheterminal strip,andconnecttheroom
thermostat(or chrono-thermostat).
Flow water temperature is adjusted in accordance to the
outdoor one ( climatic function ). In order to do so, it is
necessary to mount an outdoor probe (SE), available as
optionalan option. Use connector 9-10 on theconnecting
strip to connect the probe. Place it on the outside, north
wallof thebuilding, do notabsolutely place it on thesouth
one or towards the sun.
NOTE: separate electric cablesfrom powerand signalones
(TA, SE) and install them inside separates pipes.
3.5.INFORMATION TO BE RESPECTED BEFORE AND
DURING THE INSTALLATION OF THE EQUIPMENT ON
THE WALL.
- The heating system, and radiators in particular, and the
sanitary water system must be thoroughly washed with
water and a detergent-degreaser;
- Make sure the external systems are connected to the
correct boiler pipes. Ensure that all pipe connections are
correct.
- The relief valve inside the boiler must be connected to a
dedicated discharge pipe. The Manufacturer shall not
shoulder any responsibilities for damage caused by
the relief valve water, when not connected to a
discharge system.
-Whenthe equipmentisinstalled undertheheating system
units,on-offvalvesshouldbeinstalledbetweenthesystem
and the boiler, thus facilitating maintenance activities.
- The sanitary water flow rate must be adjusted (on the
flow meter, no.19 Fig.7): when the flow rate decreases,
the water temperature increases; when the flow rate
increases,the temperature decreases. The flow regulator
is not a pressure reducer; therefore, if the water system
pressure is too high, external pressure reducers must be
installed.
- Make sure that the free space and distances
recommended in this manual are respected, to facilitate
maintenance activities.
- Make sure that the fume discharge pipe, the chimney
and carburant air supply system are clean and efficient.
-With referenceto forced-flowequipment, makesure that
no other fume discharge pipes are connected to the
chimney, with the only exception of chimneys for sealed-
chamberboilers.
- Make sure that condensation and rain water in the fume
and air pipes are collected and discharged and do not
reach the boiler.
- Connect the air intake and fume discharge pipes; make
sure that they are stable, but removable; they must not
beloose and theirsealing over timemust be guaranteed.

11
TECHNICAL MANUAL FOR INSTALLATION, USE AND MAINTENANCE
3DFF * S* * S* * S*
50% 25-45 2.5 mbar 40-50 8 mbar 45-55 10 mbar
3PD[ * S* * S* * S*
100 >85 9,5 >85 33,5 >85 34,0
80 >65 6,0 >70 21 >70 22,0
65 >45 4,0 >60 14 >60 15,5
50 >25 2,0 >50 9,5 >50 10,0
3.6 ELECTRONIC CARD SETTING
NOTE . The following operations must be carried out by
technicians authorised by the Manufacturer.
Unauthorised personnel shall not carry out any activities.
Wrongoperations may jeopardise proper operation of the
boiler and render the guarantee certificate null and void.
The Manufacturer shall not shoulder any responsibilities
incaseofequipmentdamage or damage caused topersons,
animals or objects by the equipment as a result of wrong
operations.
Before releasing the boiler to the final user, check the card
setting or set the card.
JUMPERS LIST
The METHANE/LPG jumper J7 (see figure below) selects
the modulation current field; disable for methane (gas
pressurecalibrationup to 12mbar); enablefor L.P.G.(gas
pressure calibration up to 35mbar).
J19: DO NOT CHANGE THE POSITION SHOWN IN THE
FIGURE
J18: DO NOT CHANGE THE POSITION SHOWN IN THE
FIGURE
Jumper J17 enables the functionwhich prevents frequent
starting during the heating stage; it is disabled on the
standard version. The above mentioned phenomenon
may occur if water circulates at low speed or when the
system is relatively small: if the function preventing
frequentstarting is enabled, theboiler keeps the burner
offforatleast 2.5 minutes, regardlessofthewatercooling
down, detected by the heating system probe.
Jumper J16 enablestheparameterchangemode:thedisplay
blinksuntil itis enabled. Pacc and Pmax canbe modified.
The start power Pacc can be adjusted by pressing the +/-
buttonsonly when theparameter changemode isenabled;
it is displayed as a % of the max. power: for methane 25
equalsapprox.2.5 mbar, for L.P.G., 50 equals approx.10.0
mbar.
Use a pressure gauge to check the gas pressure accuracy.
The Pmax heating power can be changed by pressing the
+/- buttons only when the parameter change mode is
enabled; it is displayed as a % of the max. power (it is pre-
seton99,butthisvaluemustdropbelow85tostartreducing
the max. pressure).
Use a pressure gauge to check the gas pressure accuracy.
J16:
PARAMETER
CHANGE NOT
ENABLED
__________________
J7:
NATURAL GAS
Pmax > 85
Pacc = 25-45
__________________
J17:
HEATING NOT
TIMED
J16:
PARAMETER CHANGE
ENABLED (Pacc=BURNER
START POWER., Pmax=MAX
HEATING POWER.)
________________________
J7:
L.P.G.
Pmax > 85
Pacc = 45-55
________________________
J17:
TIMED HEATING (off time>
2.5’)

12
TECHNICAL MANUAL FOR INSTALLATION, USE AND MAINTENANCE
Q 02'(//2 23(5$7,216
1 ER Remove the front panel of the sealed chamber by loosening its screws.
1 E --
2 ER Remove the combustion chamber front panel.
2 E --
3 E, ER Remove the burner assembly from nozze-holder manifold.
4 E, ER Replace tha nozzles and copper seals with the parts included in the kit.
5 E,ER Re-install the burner.
Q *DVYDOYH 23(5$7,216
6 HW, SIT Valid only in countries where the network gas is supplyed at two pressures: install or remove the
diaphragm located between the discharge pipe and the gas valve (it is included in the kit, when
needed).
7 HW, SIT Select the gas type on the modulation card by moving the jumper J7 (Fig.8)
8 HW, SIT Remove the modulator cover
9 HW, SIT Loosen the plug from the gas valve pressure inlet and check the incoming pressure with a
pressure gauge (see table below). Check the values when the boiler is working.
10 HW, SIT Re-install the plug on the pressure inlet, open the gas valve outlet and connect the pressure
gauge to it.
11 HW, SIT Turn the screw/adjustment nut counter-clockwise by 2 revs; turn the electrical system and the
heating system on; the flame on the main burner lights.
12 SIT Check the pressure gauge value and adjust the
PD[ JDV SUHVVXUH screw; this value
corresponds to the max. burner power (see table).
13 HW, SIT Disconnect the modulator and adjust the
PLQJDVSUHVVXUH by turning the corresponding screw
(see table)
14 HW Press the modulator tip and adjust the
PD[JDVSUHVVXUH screw; this value corresponds to the
max. burner power (see table).
15 HW, SIT Re-connect the modulator and check the set pressure values.
16 HW, SIT Re-install the cap and seal the adjustment screws (e.g. with a drop of paint).
17 HW, SIT
2QWKHPRGXODWLRQFDUG move the jumper J16 (Fig.4) to enable the parameter change mode
and follow the instructions provided under section 3.6.
18 HW, SIT Disconnect the pressure gauge and place the plug on the pressure outlet.
19 HW, SIT Place the METHANE (N.G.) or L.P.G. stickers near the gas valve and rating plate.
%XUQHU
QR]]OHV ,QFRPLQJ SUHVVXUH 0D[SUHVVXUH 0LQSUHVVXUH
N.G. = 1,30 mm
L.P.G. = 0,75 mm N.G. = 20,0 mbar L.P.G.= 37,0 mbar N.G. = 10,0 mbar L.P.G. = 35,0 mbar N.G. = 0,9 mbar L.P.G. = 3,6 mbar
3.7 MODIFICATION OF THE BOILER PRESET GAS
This modification must be carried out ONLY by the Service Centre or authorised technicians using the components
included in the special kit.
The following procedure can be adopted when setting the boiler for LPG (with the LPG kit) or METHANE (with the
METHANE kit).
The following operations differ in accordance to the gas valve (HW=Honeywell; SIT= SIT La Precisa)

13
TECHNICAL MANUAL FOR INSTALLATION, USE AND MAINTENANCE
FIGURE 9 : HYDRAULIC DRAWINGS
P
T
11
22
33
4
5
6
/(*(1'$
1 Burner
2 Primary exchanger
3 Valvola gas
4 smokes thermostat
5 Air pressare switch
6 Fan
11
14
12
2
11
F
33 44
55
66
77
8
9
8
9
1010
H
T˚
T˚
P
2
13
H
T˚ P
system
flow hot
water water network system
inlet system
flow water
network system
inlet
Flue
Combustible
Air
/(*(1'
1 Primary exchanger 4 Water pressure switch 7 Flow probe 10 Filling tap 13 Sanitary probe
2 Pump 5 Safety thermostat . 8 Safety Relief valve . 11 Diverting valve 14 Flow switch
3 Expansion vessel 6 Air vents 9 Outlet valve 12 Sanitary exchanger.
FIGURE 10: COMBUSTIBLE, AIR AND FLUE CIRCUIT DRAWING

14
TECHNICAL MANUAL FOR INSTALLATION, USE AND MAINTENANCE
FIGURE 11 : ELECTRICAL DRAWING
6
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2
(/(&75,&&$%/(6&2/2856
b White gg Grey n Black
c Light-blu gv Yellow-green r Red
g Yellow m Brown vi Violet
/(*(1'
$& Starter 05 Terminal strip
$( Flame control card 17& Heating probe
$0 Flame modulation card 17& Sanitary probe
'9 Switchover valve 3 Boiler pump
(9 Gas safety electro valve S+

2 Water pressure switch
(9 Main gas electro valve 35 Flue pressure switch
($ Flame start electrode 6( Outdoor probe (optional)
(5 Flame detection electrode 7$ Room chrono-thermostat (optional)
) fuse 7) Flue thermostat
,* Main switch (not supplied) 76 Water safety thermostat
0 Sanitary priority witches 9 fan
0' Gas modulation lector valve 

15
TECHNICAL MANUAL FOR INSTALLATION, USE AND MAINTENANCE
Vista di fronte con quadretto chiuso
Vista di fronte con quadretto aperto
Vista di fronte con quadretto chiuso
Vista di fronte con quadretto chiuso
Vista di fronte con quadretto chiuso
Vista di fronte con quadretto aperto
Vista di fronte con quadretto aperto Vista di fronte con quadretto aperto
FIGURE 12: COMPONENTS POSITION
X-E X-ER
S-E S-ER
1 Double pipe system
2 screw
3 fan
4 Flue discharge
5 Coaxial pipe system air
6 Fan engine
7 Pump
8 Ignition/detecting electrode
9 Ignition transformer
11 Gas burner
13 Gas valve
14 Filling tap
15 Primary exchanger
16 Automatic air vent
17 Air pressure switch
18 Blow off tap
19 3 bar safety valve
20 Flue flow probe
21 Control boards
22 Ignition/detection device
23 Expansion vessel
24 Sanitary exchanger
25 Hot water probe
26 Flow switch
27 Water pressure switch
28 Safetythermostat
29 Heating probe
30 Instrument rack
31 Hydrometer
32 (.X Mod) Tubo da scambiat. a
deviatrice
(S Mod.) flow pipe
33 Tubo da scamb. Sanitario a deviat.
34 Tubo da scamb. Sanit. a flussostato
35 Tubo da circolatore a scambiatore
36 Tubo da scamb. Sanitario a pompa
37 Tubo acqua fredda sanitaria
38 Tubo acqua calda sanitaria
40 Tubo di uscita valvola gas

16
TECHNICAL MANUAL FOR INSTALLATION, USE AND MAINTENANCE
4 USE, OPERATION AND
MAINTENANCE
Before using the boiler, an authorised Service Centre shall
carry out the first start-up operations. A correct start-up
procedure is a pre-requisite for a long working life of the
boiler.
You can carry out the operations described below, which
should be executed as timely as possible and whenever
needed, for perfect and complete performance. These
operations can be carried out after the first start-up
procedure.
Proper operation depends on the activities carried out on:
1) FILLING TAP (see 4.1 and 4.2);
2) CONTROL PANEL (see 4.2);
3) ROOM THERMOSTAT (SEE 4.3).
Specific information for the X E Model.
When the fume draught is not sufficient, the boiler stops
and generates an error signal on the display (E5) which
lasts for at least 10 minutes. The boiler starts up again
automaticallybut it stopsagain if the draught problem still
exists.
NOTE . In case of multiple stops caused by draught
problems,de-energisethesystem,close theboilergasvalve,
call the Service Centre and do not make any re-start
attempts.There may be some boiler malfunctioning or the
malfunctioning may be due to external conditions (e.g.
clogged chimneyor airinlets) which may pose somesafety
risks.
4.1 SYSTEM FILLING.
The system filling tap is located in the lower part of the
equipment,between the pipeson theright-hand side,near
the wall (no.14 Fig.12).
Onthe pressure gauge (water gauge, no.3, Fig. 12), check
that the heating system pressure ranges from 0.8 to 1.2
bar (the equipment does not work below 0.5 bar). If the
pressure value is low, open the filling tap (no.14 Fig.12)
when the BOILER IS COLD (T= 20°C), until the pressure
value reaches 1 bar. Close the tap when the operation is
complete.
4.2 BOILER USE
TO SWITCH ON THE BOILER
- Make sure that the on/off valves on the fuel gas line are
all open.
-Switch on the boilerby pressing its external mainswitch.
- Press the boiler ON/OFF button once. The display shows
“On” for 5".
- Press the boiler SUMMER/WINTER button once. The
display shows “o”, or “oo”, for 5":
“o” tostarthotwater production,pressagainuntil “o”
(summer)isdisplayed andonlythe right-handwarninglight
is on;
“oo” to start sanitary hot water production AND the
heatingsystem, press the button againuntil “oo” (winter)
is displayed and both warning lights go on.
- Follow the procedure below to make sure that the hot
water production and heating system meet your needs.
- If the burner does not come on and blocks (error signal
E2),solve the possible problems (gas tap closed, no gas…)
and press the RESET button (2). Switch the boiler off and
call the Service Centre if the boiler blocks repeatedly.
TO SWITCH OFF THE BOILER
-For ashort stop,press the boilerON/OFF buttononce; the
display and the warning lights go off. The main boiler
functionsare disabled.
- For a long-term stop, press the ON/OFF button and the
main switch, located out of the boiler; close the fuel gas
tap which supplies gas to the boiler.
TO KNOW ABOUT THE BOILER OPERATION
Look at the control panel warning lights:
-The Heating leds (n° 5) and the sanitary leds (n° 9) can
be:- off; in this case the relevant functions are not
operating
- on; the relevant functions are operating
- flashing: the burner is operating and the boiler is
working in order to satisfy the active function that
inducedthe request.
Please observe the display of the instrument board.
It can show:
- anumber; it indicates the temperatureof the water
deliveredtotheheatingequipment.Thisis displayed
when the heating is on (SUMMER/WINTER button
(3)set on winter, heating led (5) is on,the contacts
of the room thermostat (when present) are closed
(heating is requested).
- Two spinning hyphens: the boiler is working with a
requestofhotsanitary water(led9flashing orfixed)
- Two horizontal hyphens: there is neither request of
heating(SUMMER/WINTERbutton (3)set onwinter
orcontacts of thermostatopen) nor of hot sanitary
water.
- A flashing message, indicating a malfunction (see
the paragraph “MALFUNCTION SIGNALLING” in
the manual)
TO ADJUST THE SANITARY HOT WATER TEMPERATURE
Plus and Minus buttons (+/-) of the control panel (8, 10).
They change the water temperature value Ts, within the
30-60°C range. Press the “+/-” button once: the set Ts
value is displayed. The value is displayed for 5": during

17
TECHNICAL MANUAL FOR INSTALLATION, USE AND MAINTENANCE
bar
FIGURE 13 : CONTROL PANEL
1 2 3 4 5 6 7 8 9 10 11
thislapse of timethe set valuecan be changed by pressing
the“+/-” buttons.
TO ADJUST THE HEATING SYSTEM
Plus and Minus buttons (+/-) of the control panel (4, 6).
They change the temperature value of primary water sent
directly(without SE)or indirectly (with SE) to theradiators.
Without SE.
When the SE external probe is not connected or has been
disabled from its switch, the “+/-” buttons change the
supplied water temperature value within the 40 - 80°C
range.
Pressthe “+/-” button once: theset Tm value is displayed.
The value is displayed for 5": during this lapse of time the
set value can be changed by pressing the “+/-” buttons.
The heating system operates according to the fixed
reference value of the supplied water temperature Tm.
With SE (optional, on pre-set boilers).
To benefit from the climatic function, and consequently
from a better adaptation of the equipment to the heating
needs of the room, an external temperature probe must
be installed (SE), This probe is supplied on request. As for
the installation and the electrical connection of the SE,
please see the booklet of boiler. The trigger box detects
the presence of an external probe and starts working on
climatic mode. The temperature of delivery varies as a
functionoftheexternaltemperaturefollowingacurvewhich
is set up (out?) by two parameters. These parameters can
be inserted by the buttons + and – for the regulation of
the heating (see diagram):
1) Waterdelivery temperature (Tm1) requested when
the external temperature (Te) is higher than 15°C
2) Water delivery temperature (Tm2) requested
when Te is lower than 0° C.
Whentheheatingregulation buttons are pressedtheactual
value of Tm1 will be shown ????? non capisco l’italiano.
After few seconds two hyphens will appear on the display.
Once this occurs the value of Tm2 will have to be inserted.
Tm1 and Tm2 must always be comprised between 0 and
80° C, Tm1 ≤Tm2.
When the external probe is present the climatic function
can also be deactivated as follows:
The boiler being off (stand-by,) press contemporarily for
five seconds the buttons SUMMER/WINTER and “+” of
heating. The message “of” will appear on the display. The
function can be activated again by pressing the same two
buttons and the appearing message will be “on”.
Thediagram asideshows an exampleof climatic regulation
with Tm1=55°C and Tm2=75°C. When the external
temperature is comprised between 0 and 15° C, the
temperature of delivery stays between 55 and 75°C.
TO ENABLE THE “CHIMNEY SWEEP” FUNCTION – FOR
TECHNICIANS ONLY
1 ON / OFF 5 heating function led 9 sanitary function led
2 RESET 6 heating temperature decreasing 10 sanitary temperature decreasing
3 SUMMER / WINTER 7 display 11 monometer
4 heating temperature encreasing 8 sanitary temperature encreasing
This function blocks the burner power modulation on the
max. value so that combustion tests can be carried out. To
enablethis function,turnoffthe boiler, keepthe SUMMER/
WINTER button pressed and turn it on again by pressing
the ON/OFF button: the display flashes until it is disabled.

18
TECHNICAL MANUAL FOR INSTALLATION, USE AND MAINTENANCE
To disable it, press the SUMMER/WINTER button or turn
the boiler (external) main switch off. It also stops when
sanitary hot water is collected. The burner goes off when
the 85°C temperature is reached.
4.3 BOILER OPERATION
Allsystems areequipped witha micro-processorcontrolled
adjustablegas valve.The equipment poweris continuously
modulated up to 30% of the rated value and is
automatically adjusted to the sanitary and heating system
needs. In case of operation under the min. adjustable
power, the burner works in “on-off” mode and the user-
set temperature is considered as a reference value. When
thesanitarysystemworks in “on-off”mode,theequipment
stops at +3° vs. the set temperature and re-starts at –3°
vs. the set temperature. When the heating system works
in “on-off” mode, the equipment stops at +5° vs. the set
(orcalculated) temperature and re-starts at –5° vs. theset
temperature.
Theburnerandthepumparesimultaneouslyenabledduring
the heating and sanitary system operation. During these
stages, the temperature is controlled by the heating and
sanitary probes, respectively. When the set temperature is
very close, the burner switches from the max. power to
the min. power. If the temperature keeps increasing, the
burner goes off, but the pump does not.
*-
Tostart theheating system, turn on the equipment and set
the summer/winter switch and the room thermostat (if
installed) on heating enable mode. The burner and
circulation device start working and the radiators warm
up. The heating system operation is automatically
controlledby the room thermostat (ifinstalled) andheating
temperature adjustment. When the room thermostat is
enabled, the burner and circulation device go off, while
theheatingtemperatureadjustment keeps thetemperature
ofthewaterflowing fromtheboilertotheradiatorsconstant
and identical to the displayed temperature. It controls the
modulation, turning off and re-starting of the burner by
keeping the circulation device on, so that any system
temperature variations are immediately detected.
If the system does not work for 24 hours, the pump starts
up for a few seconds, thus preventing any block due to
clogging.Thisfunctionisactiveevenwhentheon-offbutton
is OFF.
To start the sanitary hot water system, open the tap; the
heating system stops temporarily, as long as hot water is
collected. When sanitary hot water is produced, the
deflection valve switches and the burner and circulation
device work simultaneously. The sanitary hot water
temperature is controlled by the sanitary temperature
adjustmentsystem,which controlsthe modulation, turning
offand onof the burner. The internalrecirculationis active,
so that sanitary water temperature variations are
immediately detected.
When the heating system is working, hot water can be
produced whenever it is requested.
While sanitary hot water is being collected, the heating probe
works as a limit thermostat at 85°C, thus preventing primary
water over temperature
4.4 ROOM THERMOSTAT.
The room thermostat (or chrono-thermostat) is installed out of
the equipment. It is installed 1.5 m above the floor, on an
internal wall of the flat, away from sun rays and radiators. It
controls the heating system operation by keeping the air
temperature in the flat under control. When it is enabled, the
heating system is disabled, i.e. the pump and burner go off. It
has the same function of the summer/winter key.
The room thermostat has at least three operating positions:
- 0 - heating system disabled (heating system off): only
sanitary hot water production is enabled;
- AUTO – on-off operation: the room temperature can be set;
usually 20°C;
- I - the room thermostat is disabled (heating system on):
the heating system is enabled and controlled by the equipment,
i.e. by the heating thermostat.
When no room thermostat is installed, the situation is always
as described in - I -.
The room thermostat and timer do not affect the sanitary hot
water production.
NOTE:
The room thermostat can control the heating system
only when all the following conditions occur:
- the equipment is on (green light),
- the summer-winter switch is on winter,
- the boiler heating system temperature is not too low.
The room thermostat can be replaced by a chrono-
thermostat which combines the room thermostat and timer
functions (heating system time programmer). In this case, daily
times of heating system operation must be set.
When the room thermostat contact opens, the micro-
processor executes a 5 second-post circulation to avoid
overtemperature of the boiler primary water.
4 .5 ANTIFREEZING FUNCTION
The boiler has a function preventing from risks of freezing
of the equipment and of its internal parts. In case the
temperature of the water, which is pointed out by the
delivery probe (?) reaches critical vaues (5° C), the boiler
reacts activating the circulator and then, when necessary,
ignitingthe burner.The function is active evenif the boiler
is off (STAND-BY), but with the general switch on. The
anti-freezing function can anyhow be excluded through
the following operation: with boiler off keep pushing for
fiveseconds contemporarily the buttons SUMMER/WINTER

19
TECHNICAL MANUAL FOR INSTALLATION, USE AND MAINTENANCE
MALFUNCTIONING SIGNAL
E1 Missing water in the radiators or water pressure lower than 0.5 bar; this value can be checked on the water
meter (11); no boiler electrical component is enabled; open the tap to increase the water pressure and
automatic operation will re-start.
E2 When it flashes, the burner has blocked. Also a figure may blink: it indicates the stored primary temperature
when the block occurred; if no figure blinks, the block occurred when sanitary water was being collected; if a
figure blinks, the block occurred during the operation of the heating system; this shows whether the block
occurred as a result of over temperature or missed flame detection (cold or hot condition). Press the reset
button (2) to try and restart the boiler.
E3 When it flashes, the heating probe is disabled or damaged. Reset or replace the probe to re-start the boiler.
E4 When it flashes the sanitary probe is disabled or damaged. The sanitary mode is possible but the hot water
temperature is lower. It keeps flashing until the probe is reset or replaced. The function detecting that the
probe is not working is enabled only when hot water is collected.
E5 When it flashes, the boiler is not working because of bad draught. In the (PRGHO, the flashing stops after
10 minutes and the burners starts working again; after a few minutes it stops again if the problem has not
been solved. In ()(5 models, the flashing continues until the problemis solved.
The temperature values flash when the Pacc and Pmax values are being changed (call the technician) or if
the chimney sweep function is enabled.
(3) AND “+” of the sanitary (8); the message “of” will
appearonthedisplay.Inordertore-activatethefunction,
simplyrepeat the sameoperation andthe message“on”
will appear.
The anti-freezing function does not grant a total
protection from freezing due to the fact that this is
subordinatedto thecorrectfunctioningofthe boiler.This
is not granted, for instance, when the electric or gas
supply is interrupted, when the flue gas exhaust pipes
are obstructed or when a failure of an internal
component occurs. Therefore the custom is that some
anti-freezing liquid is added to the equipment, as
suggestedinthe section “INSTALLATION”of the manual.
4 .6 MAINTENANCE.
NOTE ! Only skilled technicians can carry out activities
inside the boiler
Should a malfunctioning occur, shut down the device, call
the Service Centre and do not carry out any maintenance
operation: the hot surfaces inside the boiler may cause
BURNSand theenergised componentsmay causeSHOCKS
or SHORT CIRCUITS!
Call the authorised Service Centre for yearly compulsory
maintenance.
Beforecleaning the shell, de-energisethe electrical system
anduse a wet cloth andsoft detergent to remove thedust
andbuild-ups.
Keep the area where the boiler is installed always clean;
do not cover air intakes which allow combustion and/or
cooling air to enter the system.
NOTE ! Make sure that unauthorised people, children,
animals or anything else which may damage or be
damaged by the boiler, cannot easily access the boiler.

20
TECHNICAL MANUAL FOR INSTALLATION, USE AND MAINTENANCE
5&$)/*$"- %"5"
4& 4&3 9& 9&3
Boiler category II2H3+ II2H3+ II2H3+ II2H3+
Thermal fluid Water Water Water Water
Maximum water pressure - heating / sanitary
CBS
3/ - 3/ - 3/6 3/6
Minimum water pressure - heating / sanitary
CBS
0.5/ - 0.5/ - 0.5/0.5 0.5/0.5
Electric power supply
7
230V 230V 230V 230V
Heat input ( Hi ) - Minimum/Nominal
L8
7,5/25 7,5/25 7,5/25 7,5/25
Heat input ( Hi ) - Minimum/Nominal
LDBMI
6450/21500 6450/21500 6450/21500 6450/21500
Heat output (80 - 60 °C)
L8
22,7 23,3 22,7 23,3
Heat output (80 - 60 °C)
LDBMI
19522 20038 19522 20038
Consumption of Natural Gas (G20) - min./ nomin.
P

K 0,8/2,69 0,8/2,69 0,8/2,69 0,8/2,69
Consumption of Butane (G30) - min./ nomin.
P

K 0,25/0,78 0,25/0,78 0,25/0,78 0,25/0,78
Consumption of Propane (G31) - min./ nomin.
P

K 0,27/0,88 0,27/0,88 0,27/0,88 0,27/0,88
Pressure of Natural Gas (G20) 20mbar - min./ max
PEDU
0,9/9,5 0,9/9,5 0,9/9,5 0,9/9,5
Pressure of Butane (G30) 30mbar - min./ max
PEDU
3,2/27 3,2/27 3,2/27 3,2/27
Pressure of Propane (G31) 37mbar - min./ max
PEDU
3,6/33,5 3,6/33,5 3,6/33,5 3,6/33,5
Soft start pressure of Natural Gas (G20)
PEDU
2,5 2,5 2,5 2,5
Soft start pressure of Butane (G30)
PEDU
8888
Soft start pressure of Propane (G31)
PEDU
10 10 10 10
Power modulation - min./ max

30/100 30/100 30/100 30/100
Expansion vessel
O
7777
Electric power absorbed by the pump - min./ max
8
35/80 35/80 35/80 35/80
Electric power absorbed by the fan
8
47 47 47 47
Sanitary water production - Dt 25°C
MNJO
--1313
Sanitary water production - Dt 30°C
MNJO
--1111
&GGJDJFODZ%JSFUUJWB$&&
Efficiency at full load (80° - 60° C)

90,6 93,3 90,6 93,3
Efficiency at 30% load Tm = 50°C (60° - 40°C)

88,4 90,1 88,4 90,1
Combustion efficiency (80° - 60° C ; Ta= 20° C)

93,4 95,2 93,4 95,2
Flue gas temperature (air comburent 20°C)
¡$
114 127 114 127
Energy lost with burner functioning (80° - 60° C) =
1G 
6,6 4,8 6,6 4,8
Energy lost though the casing (Tm = 70°C)

2,8 1,9 2,8 1,9
Class of efficiency 92/42/CEE
ÌÌ ÌÌÌ ÌÌ ÌÌÌ
8BUFSDPOOFDUJPO
Inlet system
JO
G 3/4"M G 3/4"M G 3/4"M G 3/4"M
Sanitary water
JO
- - G 1/2"M G 1/2"M
Gas inlet
JO
G 1/2"M G 1/2"M G 1/2"M G 1/2"M
Sanitary cold water
JO
- - G 1/2"M G 1/2"M
Outelet from system
JO
G 3/4"M G 3/4"M G 3/4"M G 3/4"M
Flue gas outlet and air inlet (Separated)
NN
130 60 - 60 130 60 - 60
Flue gas outlet and air inlet (Coaxial)
NN
- 100 - 60 - 100 - 60
%JNFOTJPOTBOEXFJHIU
Heigth
NN
700 700 700 700
Width
NN
400 400 400 400
Depth
NN
300 300 300 300
Weigh
LH
27 35 30 38
4FUUJOHT
Heating regulation temperature - min./ max
¡$
50 / 80 50 / 80 50 / 80 50 / 80
Sanitary regulation temperature - min./ max
¡$
- - 30 / 60 30 / 60
(*) Tests carried out with Natural Gas (G20)
codice: LBR05/088 1003