Gruppo Imar THEA++ MR/CR KONDENS User manual

ITALIAN DESIGN
MADE IN ITALY
THEA++ MR/MN CR/CN
Wall-mounted condensing boiler
ITALIAN DESIGN
MADE IN ITALY

1
THEA++ MANUAL
VERS. 09/2020 - REV. 0

2
TABLE OF CONTENTS
General requirements 2
-EC conformity declaration 2
-General information 2
Use and operation 3
-Description of the boiler 3
-Components 3
-Ignition 4
-Interface description 4
-Stand-by Main menu 5
-Operation Main menu 6
-Season selection 7
-Temperature regulation 7
-Information menu 8
-
Operation with room thermostat 10
-Operation with outdoor probe 10
-Operation with cronothermostat
Open-therm 10
-Special functions 11
-Faults 12
-Fault codes table 13
Installation 14
-Operation diagram 14
-Three-way boiler diagram 14
-Electrical wiring diagram 15
-Graphs for the head available
to the system 16
-Installation 16
-Fastening the boiler to the wall 17
-Layout of connections 18
-Plumbing the boiler 18
-Connecting lling tap for central heating
only boilers 19
-Filling the system 19
-Connecting the condensate line 19
-
Connection to the mains gas supply 20
-Connection to the mains electrical system 21
-Combustion gas evacuation
system: compatible applications
22
-Combustion gas
evacuation system: installation 23
-Air intake and combustion gas evacuation
system: important information
25
Adjustment and maintenance 26
-Preliminary maintenance operations 26
-General maintenance operations 26
-Service function 26
-Data plate 28
-Power adjustment 28
-
Testing the gas supply dynamic pressure 29
- Heating power adjustment 30
-Analysis - Checking and regulating
combustion 31
-Changing gas type 32
-Accessing the conguration menu 33
-Conguration menu 35
-Installation 37
-Installation and conguration
of external temperature sensor 38
-Conguring the climate curve
from those available 39
-Special functions 40
-Thermostat post circulation/ventilation
function 41
- Deaeration function 41
-Technical Data sheet 41
GENERAL INFORMATION
This manual, supplied with every boiler, should be considered
as an integral component as it contains instructions for
the correct, safe and appropriate installation, use and
maintenance of the system.
The manual must always be kept by the user of the boiler
and made available for the installation and/or maintenance
technicians to consult. It must also accompany the boiler if it
should be moved or otherwise transferred.
The manufacturer shall not be held responsible for any
damage caused by failure to follow the instructions contained
in this manual, nor:
If the boiler is used for purposes other than those for which
it was built.
If any part or circuit of the boiler is modied.
If accessories or kits not approved by the manufacturer
are installed.
If ordinary and extraordinary maintenance is not performed
by qualied personnel.
If applicable technical and legal requirements have not been
observed during installation and maintenance of the boiler.
WARNING!
If the boiler should cease to function or not function correctly,
deactivate it immediately by turning it off and then shutting
off the gas supply. Do not attempt any repairs or direct work
on the boiler.
Only personnel with the necessary qualications and licenses
must perform maintenance on the boiler. Any repairs must be
performed using only original parts and accessories.
SYMBOLS USED IN THE MANUAL:
Advice, suggestion, note
Important information, indications of methods
and operations which could compromise
correct operation of the boiler and create
a hazard.
EC CONFORMITY DECLARATION (ACCORDING TO ISO/IEC 17050-1)
GENERAL REQUIREMENTS
G20 Engineering srl estabilished in Loc. Campogrande, 13 - Carpaneto Piacentino whose processes of design,
manufacturing and after-sales service are in compliance with requirements of UNI EN ISO 9001:2008 - DECLARES
that THEA boilers are in compliance with European Directives and with European Delegates regulations.
Chief Executive Marco Rapaccioli
CE CERTIFICATES ARE AVAILABLE ON OUR WEBSITE www.produzionecaldaie.it

3
DESCRIPTION OF THE BOILER
COMPONENTS
The range of THEA wall-hung boilers is
updated to the TheA++ model. A perfect,
powerful, reliable, ecological machine,
equipped with a condensing high efciency
heat exchanger, entirely made in Italy.
THEA++ MR CR KONDENS
2) HEAT EXCHANGER
3) SAFETY SENSOR
4) CH PROBE
5) 3WAY GROUP
6) SAFETY VALVE
7) DHW IMMERSION PROBE
8) PRESSURE GAUGE
9) CIRCULATOR UNIT
10) DHW PRIORITY DEVICE
11) PRESSURE TRANSMITTERS
12) GAS VALVE
13) SECONDARY HEAT EXCHANGER
14) FAN
Pict. 1
Fig. 2
USE AND OPERATION
x MR/MN 240 X CR/CN
14
13
6
10
12
4
3
5
11
79
8
2
Compared to the previous version, we
have updated the electronics and the
user interface, making it more elegant
and intuitive, while keeping the boiler’s
performance unchanged.

4
THEA
++
MN CR KONDENS
2) MAIN HEAT EXCHANGER
3) SAFETY SENSOR
4) CH PROBE
5) -
6) SAFETY VALVE
7) -
8) PRESSURE GAUGE
9) CIRCULATOR UNIT
10) -
11) PRESSURE TRANSMITTER
12) GAS VALVE
13) -
14) FAN
Pict. 3
INTERFACE DESCRIPTION
IGNITION
14
6
9
12
11
2
3
4
8
Turn on the boiler’s electrical supply at the
switch, which must be installed on the power
supply line to the boiler. The LCD display (with
blue backlight) will turn on immediately,
showing the two-digit software version
number loaded on the microprocessor for
a few seconds, while an automatic check
is performed on the conditions of the system
and installed devices. When this stage has
nished, if no faults are present, the last page
of the MAIN MENU to be stored is displayed
on the LCD (the one being displayed when
the power was turned off).
1. ON/OFF BUTTON
2. SUMMER/WINTER BUTTON
3. RESET BUTTON
4. INFORMATION/CONFIGURATION BUTTON
5. DHW TEMPERATURE DECREASE
6. DHW TEMPERATURE INCREASE
7. CH TEMPERATURE DECREASE
8. CH TEMPERATURE INCREASE
The interface allowing all operating parameters
to be selected and modied as well as their
relative values to be displayed is extremely
simple. It is composed of a large backlit
LCD which displays all symbols necessary for
communicating the boiler’s status in a simple
and immediate way, together with a series of
buttons which are matched unequivocally to
a specic function indicated on the display.
Consult the relevant sections to get
explanations on the symbols and the possible
operating modes.

5
“STAND-BY” MAIN MENU
When the boiler is turned on, two operating
modes are possible. These constitute the
MAIN MENU from which it is possible to set any
operating mode required or view the boiler
status at any time. The characteristics of the
possible options for each of the MAIN MENU
pages are given below:
Page 1 – STAND-BY (Pict. 5.1)
In this mode the device is powered on but all
functions regarding the supply of domestic
hot water or central heating are inactive.
In this mode the central heating system
pressure is displayed (in boilers with pressure
transmitter) and the MAIN MENU can be
entered by pressing button 1; to go back to
the starting page (STAND-BY) press button 1
again (Pict. 5.2)
By pressing button 4, the INFORMATION
MENU is accessed; to go back to the starting
page, press button 4 again (Pict. 5.3)
Consult the relevant chapters for menu
exploring and menu functions: “FUNCTION”,
“INSTALLER MENU”.
When in the STAND-BY mode, all fault
indication modes remain active as do the
main maintenance functions for the diverter
valve (when tted) and the circulator unit
together with the ANTI-FROST function.
Pict. 5.1
Pict. 5.2
Pict. 5.3
In standby/off mode the boiler is
inactive but its electricity supply
is still connected!
1
1
4
4

6
“OPERATION” MAIN MENU
The OPERATION page is the main page which
is always displayed during normal operation
of the boiler. Symbols regarding the following
items are always displayed on this page:
Boilers with domestic hot water production
• The selected season.
• The DHW temperature set.
• The temperature of the water in the CH
circuit.
• The INFORMATION menu access symbol.
• The INSTALLER menu access symbol.
• The standby/off menu access symbol.
(Pict. 6.1)
When the burner is lit and running in order to
produce domestic hot water, the tap symbol
ashes and the temperature of the supplied
domestic hot water is displayed. During
heating of the central heating circuit water,
the radiator symbol ashes alternatively to the
C.H. temperature: in both cases, the ame
symbol is always displayed (Pict. 6.2). Based
on whether devices such as the pressure
sensor, external temperature sensor and OT
timer thermostat are installed, the following
are displayed, respectively: the pressure
of the central heating circuit with relative
symbol, the external sensor present symbol
and the OT timer thermostat present symbol.
(Pict. 6.3).
Central-heating only boilers
• The temperature of the water in the CH
circuit.
• The INFORMATION menu access symbol.
• The INSTALLER menu access symbol.
• The standby/off menu access symbol.
(Pict. 6.4)
When the burner is operating the ame signal
is displayed with the radiator symbol ashing
(Pict. 6.5). Based on whether devices such
as the pressure sensor, external temperature
sensor and OT timer thermostat are installed,
the following are displayed respectively: the
pressure of the central heating circuit with
relative symbol and the OT timer thermostat
present symbol. (Pict. 6.6).
Pict. 6.1
DHW temperature
CH temperature
Season selector
Info menu
CH temperature
System pressure
External temperature sensor
OT thermostat remote
control
System pressure
External temperature sensor
OT thermostat remote
control
Burner on
Burner on
Pict. 6.2
Pict. 6.3
Pict. 6.4
Pict. 6.5
Pict. 6.6

7
SEASON SELECTION
TEMPERATURE REGULATION
The boiler has two operating modes, which
depend on the basic configuration, in
response to the external temperature or
the user requirements. These modes can be
selected from the OPERATION page:
• Boilers with domestic hot water production
SUMMER mode deactivates all central
heating functions, maintaining only domestic
hot water production. When the boiler is in
this mode the SUN symbol is displayed on the
function page (Pict. 7.1).
• WINTER mode, in which all central heating
and domestic hot water production functions
are active. When the boiler is in this mode
the SNOWFLAKE symbol is displayed on the
function page (Pict. 7.2).
• To select the desired mode, press button 2.
Central-heating only boilers
The season selection option is not available
in central heating only boilers. The device
can therefore be in standby (Pict. 7.1) or else
operational, ready to supply the only SERVICE
which it has been manufactured for (Pict. 7.3).
Pict. 7.1
Pict. 7.2
Pict. 7.3
2
2
Appliances for DHW production
It is possible to adjust DHW temperture
and CH water temperature; the set
temperature value is reached and
maintained during requests, thus allowing
the required comfort in both cases. The
temperature supplied for both modes is
shown continuously on the display near
the relevant symbol when the functions
are active: the radiator for CH, the tap
for DHW.
During the waiting periods, the DHW
temperature displayed is the set one.
DHW temperature adjustment
Press one of the two buttons located above
the tap symbol (5-6); the set and displayed
temperature value starts flashing, then to
increase the DHW temperature, press button
(6). Each press will increase temperature
by 1°C. To decrease DHW temperature
press button (5). Each press will decrease
temperature by 1°C.
Once the desired temperature value has been
identied, do not press keys 5 and 6 anymore;
the new heating uid temperature value ashes
for 5 seconds and is automatically stored and
shown on the display. The DHW temperature
values that can be set range from a minimum
of 30°C to a maximum of 60°C.

8
INFORMATION MENU
Setting CH temperature
Press one of the two buttons upon the tap
symbol (7-8). The numbers indicating the
temperature ash, then press the button
(8) to increase the temperature of CH. Each
time this button is pressed, an increase by
1°C is obtained. In order to decrease the CH
temperature, press the button (7). Each
time this button is pressed, a decrease by
1°C is obtained.
Once the needed temperature value is
set, do not press the (7-8) buttons anymore.
The new CH temperature value will ash
for 5 seconds, then it will be stored and
displayed.
The CH temperature values depend on the
type of installation.
For boilers used for high temperature
systems, the temperature range is 50°C
– 80°C, while for the ones used for low
temperature systems, the temperature
range is 27°C – 55°C.
Setting heating temperature
If the “Summer” mode is active (the
sun symbol is displayed), the device for
modifying the CH temperature is disabled.
Boilers for central heating only
Only the temperature value for the single
option which can be viewed on the
display can be adjusted in central heating
only boilers. Setting the central heating
temperature is performed as previously
described.
DHW temperature CH temperature
Pict. 8
THE USE OF TOO HIGH DHW
TEMPERATURES CAUSES THE
PREMATURE WEAR OF THE DHW
HEAT EXCHANGER.
ASK YOUR AREA INSTALLER FOR
INFORMATION ON THE TYPE
OF SYSTEM CONNECTED AND
RESPECTIVE ADJUSTMENTS
56 7 8
Accessing the INFORMATION MENU allows
various important parameters regarding the
boiler adjustments and status to be viewed,
allowing the state determining its operation
to be known at any time. The displayed
parameters cannot be modied.
To access the menu pages, press BUTTON 4.
The menu can be accessed both when the
boiler is in stand-by and when it is operating.
Selecting the menu pages
In order to visualize the values of all
the INFORMATION MENU parameters,
after activating the initial page which
immediately displays the central heating
temperature, press the button (6) to scroll
forward the pages and press the button
(5) to scroll backward the pages.
The exit from the menu pages can be
automatic after 60 seconds of inactivity,
or it can be activated by pressing any key;
once you have chosen to end the display,
this will return to the menu page active
when accessing the INFORMATION MENU.

9
Information menu list
1 DHW temperature
2 Return sensor temperature
3 Flue gas probe temperature
4 External sensor temperature (if present)
5 CH circuit pressure
6 Ionization current
7 Fan speed
8 Last fault code
9 Second to last fault code
10 CH temperature
11 Days to ordinary maintenance expiration
12 Circulator Feedback
* REQUEST INFORMATION ON CONNECTED DEVICES FROM AREA AUTHORISED
INSTALLER
Pict. 9
“1”
“4”
if present
“7”
“9”
“8”
CFS
dUt
Cor
SPE
“2”
“3”
“5”
“6”
“10”
“11”
“12”

10
REQUEST INFORMATION ON
INSTALLATION OF THE EXTERNAL
SENSOR AND OPTIMAL REGULATION
OF THE BOILER FROM YOUR AREA
AUTHORISED INSTALLER.
REQUEST INFORMATION ON
INSTALLATION OF THE EXTERNAL
SENSOR AND OPTIMAL REGULATION
OF THE BOILER FROM YOUR AREA
AUTHORISED INSTALLER.
OPERATION WITH ROOM THERMOSTAT
OPERATION WITH OUTDOOR PROBE
Operation with room thermostat
In compliance with current legislation on
energy saving, it is MANDATORY to connect
the appliance to a room thermostat for
optimal regulation and maintenance of the
room temperature
The boiler can be connected to an OUTDOOR
probe. In this mode, the boiler is able to adjust the
CH water temperature automatically, according
to the temperature detected by the probe
positioned appropriately outside the building.
The regulation takes place automatically by
obtaining the CH water temperatures from a
special preloaded mathematical function; by
modifying appropriate parameters, different
“climatic curves” can be selected, making it
possible to optimize the appliance for a specic
climatic zone or seasonal period. However, it
is possible to make a personalized adjustment
of the CH water temperature; by increasing or
decreasing the value of the CH temperature,
an adaptation of the same (compensated
temperature) is obtained according to the
selected climatic curve.
REQUEST INFORMATION ON
INSTALLATION OF THE EXTERNAL
SENSOR AND OPTIMAL
REGULATION OF THE BOILER
FROM YOUR AREA AUTHORISED
INSTALLER.
OPERATION WITH CRONOTHERMOSTAT ECO CRONO OPEN-THERM
The “ECO CRONO” programmable
chronothermostat Open-Therm (O.T.)can be
used for optimal and even more economical
management of temperatures in domestic
environments. The “ECO CRONO” allows
all main boiler functions to be managed
remotely, allowing it to be fully managed
from a different room to that where the
boiler is installed. “ECO CRONO“ can also
be used to schedule daily and weekly
room temperatures and manage reduced
demand periods (holidays, anti-frost and
maintenance modes).
To connect ECO CRONO O.T. use the cable
labeled “TA” for which the appliance is
already set up (the same set up for the room
thermostat).
Refer to the instructions for correct installation
and use of the “ECO CRONO” thermostat.
To activate the O.T. communication it is
necessary to select the corresponding
parameter P13.

11
ALWAYS LEAVE THE BOILER
POWERED ON AND THE SHUT-OFF
VALVES OPEN, IF THE SYSTEM IS
EXPECTED TO BE SUBJECT TO VERY
COLD TEMPERATURES.
THIS FUNCTION DOES NOT GRANT
TO PREVENT THE HEATING SYSTEM
FROM FREEZING, SINCE IT DEPENDS
ON THE BOILER CONTINUOUS
ELECTRIC POWER AND GAS
SUPPLY.
FOR INFORMATION ABOUT
CONFIGURING THE BOILER TO
PROTECT IT FROM FREEZING, ASK
THE AUTHORIZED AREA INSTALLER.
FOR INFORMATION ABOUT
CONFIGURING THE DHW
TEMPERATURE, ASK THE
AUTHORIZED AREA INSTALLER.
ACTIVATING THIS FUCTION MAY
CAUSE THE EARLY DETERIORATION
OF THE DHW EXCHANGER AND A
HIGHER GAS CONSUPTION.
FOR INFORMATION ABOUT
THE CORRECT FUNCTION
CONFIGURATION, ASK THE
AUTHORIZED AREA INSTALLER .
SPECIAL FUNCTIONS
• Heating system Anti-frost function (all
models)
The anti-frost function is always active and
prevents the heating system water from
freezing.
If the heating circuit water temperature probe
detects a too low water temperature, the
circulating pump starts and the burner ignites
at the minimum power.
The function remains active until the set
temperature is reached, in order to prevent
the heating system water from freezing.
• Instant DHW exchanger pre-heating
This function can be activated exclusively on
models which are prepared and congured
to instantly obtain domestic hot water; this
function allows to keep the DHW exchanger
at a temperature which is close to the set one.
The activation of this function may improve
the boiler’s performance on the DHW request.
• Comfort zone
The boiler may be prepared in a way to heat
several zones in different ways.
This, for instance, allows to easily divide a
single housing unit into different comfort
sectors

12
FAULTS
All functions supported by the boiler are
managed by a microprocessor-based system
which, aside from allowing the system to run
perfectly in order to maintain the greatest
level of comfort possible, constantly monitors
the functional parameters, ensuring they fall
within the necessary safety interval by a wide
margin, and therefore that all devices present
are functioning perfectly.
Whenever the malfunction of any component
or conditions which could compromise safe
operation of the system are detected, the
microprocessor system places the device
into a limited operation mode or even
completely prevents it from operating. The
microprocessor system is able to detect and
issue warnings for the main fault conditions
to allow the system to be brought back to
normal conditions as soon as possible. Fault
warnings are given on the LCD display. The
malfunction is detected and an intermittent
warning displayed immediately, consisting
of a number preceded by the error symbol
E and by the relevant fault symbol (Pict. 10).
Faults are displayed on any screen of the
main menu.
Conditions causing transitory faults are
possible. Many of these are recognized
and cause a temporary block which is
automatically reset once the condition
causing the fault has stopped. Some of these
provide for the possibility to attempt to restore
operation manually.
Manual error reset, recovery attempt
To manually reset the system following a
fault condition, press the button 3: the RST
symbol (reset) will be displayed on the
LCD display. Press button 3 again (Pict. 11).
The microprocessor will attempt to recover
the system by resetting all the conditions
presumed to have caused the fault. If the
operation is successful the boiler will return
to normal operation; if not, the error code
causing the malfunction will be displayed
again.
Pict. 11
Pict. 10
IF A FAULT IS NOT SOLVED AFTER 2 MANUAL RESET ATTEMPTS THEN THE AUTHORISED
TECHNICAL ASSISTANCE CENTRE MUST BE CALLED.
TAMPERING WITH ANY DEVICE MAY BE DANGEROUS AND ANNULS EVERY WARRANTY
CONDITIONS.

13
FAULTS CODE TABLE
Codice Causa possibile Comportamento Azioni possibili
E01
Ignition failed Boiler locked
Check gas presence Check
gas line pressure Check
ignition/detection electrodes
Check electronic cable
Check igniter
E03
Heating system temperature
sensor fault Boiler locked Replace DHW sensor
E04
Domestic hot water system
temperature sensor fault
DHW supplied in provisional
mode
Heating functions Replace CH sensor
E06
High temperature detected by
heating system sensor Device in stand-by
Normal DHW supply Wait for automatic unlocking Check pressure to CH system
E08
Central heating system pressure
too low Boiler locked Check pressure to CH system
E09
Over-temperature safety probe
intervention Boiler locked Perform reset maneuver
Contact technical support
E10
Central heating system
pressure too HIGH (> 2.7 bar) Boiler locked Check pump functioning
E11
Pressure transmitter failure Boiler locked Check integrity of
connection
Replace pressure trasmitter
E12
Remote control reset used-up Boiler locked Reset system
Switch off power
E13
SYSTEM error Boiler locked Reset system
Switch off power
Replace electronic board
E17
Exhaust probe damaged or
Exhaust overtemperature Boiler locked Reset the system or replace
the probe
E23*
Fault on external temperature
sensor Resumption of operation
without external sensor
Check position of external
probe
Check communication line
Replace external sensor
E24
Return probe damaged The boiler continues to operate
with circulator always at
maximum power Replace the probe
E25
Central heating system
temperature too low freezing risk
Boiler locked
If possible reset normal
functioning conditions
E28*
Water cylinder / water heater
probe failure
Boiler locked Replace probe
E31
Faulty safety probe
Boiler locked Replace the probe
E60
Circulator PWM error
Circulator always at maximum
power Check wiring Replace the circulator
E61
Temporary circulator failure
The circulator works in
emergency mode
Wait for normal conditions to
be restored or replace the
circulator
E62
Circulator failure
Boiler locked Replace circulator
E75
Failure communication between
electronic board and display
board Boiler locked Reset system
Switch off power
Replace electronic board
E88
Failure OPEN THERM
COMMUNICATION Boiler locked Check connection between
boiler and Open Therm
E99
Parameter
conguration error Boiler locked
Check and recongure the
parameters
*can be displayed only if the relative devices are installed

14
AB
BA
BOILER
FLOW
HOT
WATER
OUTLET
COLD WATER
INTAKE
1
2
3
BOILER
RETURN IN
OPERATION DIAGRAM
OPERATION DIAGRAM
THREE-WAY BOILER OPERATION DIAGRAM
Pict. 12
Pict. 13
Pict. 14
1) Primary heat exchanger
2) Burner
3) Fun
4) Gas valve
5) Three-way valve
6) Safety valve
7) Filling loop cock
8) Hot water priority turbine
9) Secondary heat exchanger
10) Circulator unit
11) Expansion tank
1) Primary heat exchanger
2) Burner
3) Fun
4) Gas valve
5) -
6) Safety valve
7) Filling loop cock
8) -
9) -
10) Circulator unit
11) Expansion tank
COMBINATION: DOMESTIC HOT WATER + CENTRAL HEATING
CENTRAL HEATING ONLY
7
6
8
9
11
10
2
3
1
CH
RETURN
WATER
INTAKE
DHW
OUTLET
CH
FLOW
GAS
CONDENSATE
OUTLET
4
5
7
6
11
10
2
3
1
CH
RETURN
WATER
INTAKE
CH
FLOW
GAS
CONDENSATE
OUTLET
4
1) Central heating circuit
2) Three-way valve
3) Boiler
INSTALLATION

15
ELECTRICAL WIRING DIAGRAM
ELECTRICAL WIRING DIAGRAM
COMBINATION: DOMESTIC HOT WATER + CENTRAL HEATING
Pict. 15
CENTRAL HEATING ONLY
Pict. 16
T.A. /O.T
E.P.
S.P.
FL.
F.
N.
N.
X1
F1
X6
X5
X4
X10
X3
X12
X9
11
1
11111
X2
Red +5VDC
Green -GND
Orange SIGN
Blu
Blu
Brown
Y/G
F.
N.
F.
V.G.
N.
F.
N.
F.
B
X5
X2
X3A
X1
1
6
3
4
T.P.
Red +5VDC
Green -GND
Orange SIGN
3.W.M.
FAN
P.F.
RED - PWM INPUT
BLACK - GND
GREEN -HALL SENSOR
BLU + 24 VDC
F.P.
R.P.
3
1
2
42 - 4 / H.P.
1 - 3 / S.T.
2
3
1
4
X3A
1
X3A
1
P.
Brown
Blue
Green
E.A.
T.A. - 2
1 Input/Brown
2 signal/Blu
3 output / Black P.P.
List of connections TheA++ MR/MN CR/CN
3.W.M. 3way Valve FAN Fan N. Neutral S.P. DHW Probe
B.P. Water Heater Probe
B. Boiler Earth FL. Flow Switch P. Circulating Pump S.T. Safety Probe
E.A. Ignition Electrode F.P Exhaust Probe P.F. Fan PWM T.P. Pressure Transmitter
E.P. Outdoor Probe H.P. CH Probe P.P. Pump PWM T.A./O.T Room Thermostat/ Open Therm
F. Phase M.V.G. Gas Valve Modulator R.P. Return Probe
V.G. Gas Valve
T.A. - 2 Zone 2 Room Thermostat
T.B. Storage Tank Thermostat
E.A.
T.A. /O.T
E.P.
F.
N.
N.
X1
F1
X6
X5
X4
X10
X3
X12
X9
11
1
11111
X2
F.
N.
F.
N.
F.
N.
F.
B
X5
X2
X3A
X1
T.P.
Red +5VDC
Green -GND
Orange SIGN
P.P.
P.F.
RED - PWM INPUT
BLACK - GND
GREEN -HALL SENSOR
BLU + 24 VDC
3
1
2
42 - 4 / H.P.
1 - 3 / S.T.
2
3
1
4
X3A
1
B.P.
3.W.M.
1 6
34
R.P.
F.P.
T.A. - 2
T.B.
Blu
Blu
Brown
Y/G
V.G.
FAN
P.
Brown
Blue
Green
1 Input/Brown
2 signal/Blu
3 output / Black

16
GRAPHS FOR THE HEAD AVAILABLE TO THE SYSTEM
INSTALLATION
Pict. 17
0
0
0.5
1
1.5
2
2.5
3
3.5
4
4.5
5
120 180 240 300 360 540 600 660 720 840 900 960 1080
5.5
6
420 480 780 1020 1140 12601200
Q L/h
Dp mCa
Use:
The boiler has been constructed according
to current technical standards and the most
stringent safety rules. Despite this, improper
use may endanger persons and property as
well as damaging the boiler itself.
This boiler has been designed as a thermal
generator for closed-loop central heating
systems and for the production of domestic
hot water.
This boiler is only for heating water to a
temperature below that of boiling point at
atmospheric temperature.
Any use different from those outlined herein is
to be considered improper. The manufacturer/
supplier declines any responsibility for
damage or injury caused by improper use.
Use of the boiler according to its design also
means respecting the instructions given in
the operation and maintenance manuals
and observing the general inspection and
maintenance conditions.
General requirements
• Installation must only be performed by
qualied and licensed personnel. They also
assume responsibility for correct installation,
adjustment and commissioning.
Adjustment, maintenance and repair of the
boiler must only be performed by qualied
and authorised personnel.
• Do not install the boiler in environments
containing dust or strong vapours.
The presence of substances such as uorine,
chlorine, sulphur etc. (e.g. vapours from
sprays, solvents or detergents, paints,
adhesives or fuels) may cause the boiler’s
components or combustion gas evacuation
system to corrode and become damaged.
Avoid installing the boiler directly in
commercial/industrial premises (e.g. hair
salons, painting/carpentry workshops,
cleaning companies etc.).
• The boiler must be installed in ventilated
premises.
• Install the device respecting the minimum
distances and spaces in Pict. 18 (also when
installing inside an enclosure).
• Mount the boiler on a solid wall.
• Ensure that there are no depressions which
could cause the boiler to stand out from the
wall.
• Ensure you do not drill into tracked cables
or piping when drilling.

17
Pict. 18
Pict. 19
FASTENING THE BOILER TO THE WALL
Attach the cardboard template giving the
connection and fastening schemes to the
wall, paying attention to the boiler dimensions
and necessary clearances. (Pict. 19)
• Use a suitable bit to drill the holes indicated
by the two wall plug symbols on the template.
• Remove the template; insert the two wall
plugs in the previously prepared holes, then
hang the boiler, inserting the hooks of the
plugs in the specic holes.
Fasten the template so that its axis
coincides perfectly with that of the
boiler.
750
MURO / WALL
* =DIMENSIONE VALIDA SOLO CON KIT DEL COSTRUTTORE / DIMENSION VALID WITH THE MANUFACTURED KIT ONLY
65 107
63
68
3/4" 1/2" 3/4"
MANDATA RISCALD.
C.H. OUTPUT
INGRESSO GAS
GAS INLET
ACQUA CALDA SANITARIA
D.H.W.
6365
107
37*
1/2" 3/4"
175
RITORNO RISCALD.
C.H. INPUT
INGRESSO ACQUA SAN.
D.H.W. INLET
DIMA
TEMPLATE
18
470
230
82,5 24DS / 24BT
28-32DS / 35CN
82
340
24DS / 24BT
28-32DS / 35CN
65* 67* 65*67*

18
Pict. 20
LAYOUT OF CONNECTIONS
PLUMBING THE BOILER IN
Connect the water and central heating pipes to
the boiler, respecting the positions and distances
indicated (Pict. 20); take particular care when
connecting pipes to ensure they are not placed
under pressure in order to minimise the danger of
future leaks. Use appropriate tools and procedures
for tightening.
Flush thoroughly before connecting
the pipes to ensure that any impurities
present in the piping and radiators
are completely removed.
Connect the safety valve outlet so
that its operation would not cause
any damage to persons or property
• Use piping of not less than 1/2”
diameter
• Ensure that the line is always
at atmospheric pressure by using
suitable traps (do not connect pipes
directly to the valve outlet)
• Connect the safety valve outlet line
to the household grey water drainage
system
• Apply suitable protection to the
drainage line – the water carried in it
may be at high temperatures
• THE MANUFACTURER ASSUMES
NO RESPONSIBILITY FOR DAMAGE
CAUSED TO PERSONS OR PROPERTY
DUE TO OPERATION OF THE SAFETY
VALVE DO NOT USE THE PLUMBING
PIPEWORK CONNECTIONS AS EARTH
POINTS FOR ELECTRICAL EQUIPMENT.
WARNING!!!
PROTECT THE PRIMARY HEAT
EXCHANGER BY THE USE OF THE
CORROSION INHIBITOR FLUID
EXCLUSIVELY SUPPLIED BY THE
MANUFACTURER. OTHERWISE THE HEAT
EXCHANGER WARRANTY SHALL
DECAY.
• Idraterm p.100 In 1% sol. For high
temperature systems
• Idraterm p.140 In 1% sol. For low
temperature systems
CONDENSING EXHAUST